Crypto++ 8.4 Free C++ class library of cryptographic schemes

cryptlib.h
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1 // cryptlib.h - originally written and placed in the public domain by Wei Dai
2
3 /// \file cryptlib.h
4 /// \brief Abstract base classes that provide a uniform interface to this library.
5
6 /*! \mainpage Crypto++ Library 8.4 API Reference
7 <dl>
8 <dt>Abstract Base Classes<dd>
9 cryptlib.h
10 <dt>Authenticated Encryption Modes<dd>
11 CCM, EAX, \ref GCM "GCM (2K tables)", \ref GCM "GCM (64K tables)"
12 <dt>Block Ciphers<dd>
13 \ref Rijndael "AES", ARIA, Weak::ARC4, Blowfish, BTEA, \ref CHAM128 "CHAM (64/128)", Camellia,
14 \ref CAST128 "CAST (128/256)", DES, \ref DES_EDE2 "2-key Triple-DES", \ref DES_EDE3 "3-key Triple-DES",
15 \ref DES_XEX3 "DESX", GOST, HIGHT, IDEA, LEA, \ref LR "Luby-Rackoff", \ref Kalyna128 "Kalyna (128/256/512)",
16 MARS, RC2, RC5, RC6, \ref SAFER_K "SAFER-K", \ref SAFER_SK "SAFER-SK", SEED, Serpent,
17 \ref SHACAL2 "SHACAL-2", SHARK, \ref SIMECK64 "SIMECK (32/64)" SKIPJACK, SM4, Square, TEA,
18 \ref ThreeWay "3-Way", \ref Threefish256 "Threefish (256/512/1024)", Twofish, XTEA
19 <dt>Stream Ciphers<dd>
20 \ref ChaCha "ChaCha (8/12/20)", \ref HC128 "HC-128/256", \ref Panama "Panama-LE", \ref Panama "Panama-BE",
21 Rabbit, Salsa20, \ref SEAL "SEAL-LE", \ref SEAL "SEAL-BE", WAKE, XSalsa20
22 <dt>Hash Functions<dd>
23 BLAKE2s, BLAKE2b, \ref Keccak "Keccak (F1600)", SHA1, SHA224, SHA256, SHA384, SHA512,
24 \ref SHA3 "SHA-3", SM3, Tiger, RIPEMD160, RIPEMD320, RIPEMD128, RIPEMD256, SipHash, Whirlpool,
25 Weak::MD2, Weak::MD4, Weak::MD5
26 <dt>Non-Cryptographic Checksums<dd>
27 CRC32, CRC32C, Adler32
28 <dt>Message Authentication Codes<dd>
29 BLAKE2b, BLAKE2s, CBC_MAC, CMAC, DMAC, \ref GCM "GCM (GMAC)", HMAC, Poly1305, TTMAC, VMAC
30 <dt>Random Number Generators<dd>
31 NullRNG, LC_RNG, RandomPool, BlockingRng, NonblockingRng, AutoSeededRandomPool, AutoSeededX917RNG,
32 NIST Hash_DRBG and HMAC_DRBG, \ref MersenneTwister "MersenneTwister (MT19937 and MT19937-AR)",
33 DARN, RDRAND, RDSEED
34 <dt>Key Derivation and Password-based Cryptography<dd>
35 HKDF, \ref PKCS12_PBKDF "PBKDF (PKCS #12)", \ref PKCS5_PBKDF1 "PBKDF-1 (PKCS #5)",
36 \ref PKCS5_PBKDF2_HMAC "PBKDF-2/HMAC (PKCS #5)"
37 <dt>Public Key Cryptosystems<dd>
38 DLIES, ECIES, LUCES, RSAES, RabinES, LUC_IES
39 <dt>Public Key Signature Schemes<dd>
40 DSA, DSA2, \ref ed25519 "Ed25519", GDSA, ECDSA, NR, ECNR, LUCSS, RSASS, RSASS_ISO,
41 RabinSS, RWSS, ESIGN
42 <dt>Key Agreement<dd>
43 DH, DH2, \ref x25519 "X25519", \ref MQV_Domain "MQV", \ref HMQV_Domain "HMQV",
44 \ref FHMQV_Domain "FHMQV", ECDH, x25519, ECMQV, ECHMQV, ECFHMQV, XTR_DH
45 <dt>Algebraic Structures<dd>
46 Integer, PolynomialMod2, PolynomialOver, RingOfPolynomialsOver,
47 ModularArithmetic, MontgomeryRepresentation, GFP2_ONB, GF2NP, GF256, GF2_32, EC2N, ECP
48 <dt>Secret Sharing and Information Dispersal<dd>
49 SecretSharing, SecretRecovery, InformationDispersal, InformationRecovery
50 <dt>Compression<dd>
51 Deflator, Inflator, Gzip, Gunzip, ZlibCompressor, ZlibDecompressor
52 <dt>Input Source Classes<dd>
53 StringSource, ArraySource, VectorSource, FileSource, RandomNumberSource
54 <dt>Output Sink Classes<dd>
55 StringSinkTemplate, StringSink, VectorSink, ArraySink, FileSink, RandomNumberSink
56 <dt>Filter Wrappers<dd>
57 StreamTransformationFilter, AuthenticatedEncryptionFilter, AuthenticatedDecryptionFilter, HashFilter,
58 HashVerificationFilter, SignerFilter, SignatureVerificationFilter
59 <dt>Binary to Text Encoders and Decoders<dd>
60 HexEncoder, HexDecoder, Base64Encoder, Base64Decoder, Base64URLEncoder, Base64URLDecoder, Base32Encoder,
61 Base32Decoder
62 <dt>Wrappers for OS features<dd>
63 Timer, ThreadUserTimer
64
65 </dl>
66
67 <!--
68
69 <dt>FIPS 140 validated cryptography<dd>
70 fips140.h
71
72 In the DLL version of Crypto++, only the following implementation class are available.
73 <dl>
74 <dt>Block Ciphers<dd>
75 AES, \ref DES_EDE2 "2-key Triple-DES", \ref DES_EDE3 "3-key Triple-DES", SKIPJACK
76 <dt>Cipher Modes (replace template parameter BC with one of the block ciphers above)<dd>
77 \ref ECB_Mode "ECB_Mode<BC>", \ref CTR_Mode "CTR_Mode<BC>", \ref CBC_Mode "CBC_Mode<BC>",
78 \ref CFB_FIPS_Mode "CFB_FIPS_Mode<BC>", \ref OFB_Mode "OFB_Mode<BC>", \ref GCM "GCM<AES>"
79 <dt>Hash Functions<dd>
80 SHA1, SHA224, SHA256, SHA384, SHA512
81 <dt>Public Key Signature Schemes (replace template parameter H with one of the hash functions above)<dd>
82 RSASS<PKCS1v15, H>, RSASS<PSS, H>, RSASS_ISO<H>, RWSS<P1363_EMSA2, H>, DSA, ECDSA<ECP, H>,
83 ECDSA<EC2N, H>
84 <dt>Message Authentication Codes (replace template parameter H with one of the hash functions above)<dd>
85 HMAC<H>, CBC_MAC<DES_EDE2>, CBC_MAC<DES_EDE3>, GCM<AES>
86 <dt>Random Number Generators<dd>
87 DefaultAutoSeededRNG (AutoSeededX917RNG<AES>)
88 <dt>Key Agreement<dd>
89 DH, DH2
90 <dt>Public Key Cryptosystems<dd>
91 RSAES<OAEP<SHA1> >
92 </dl>
93
94 -->
95
96 <p>This reference manual is a work in progress. Some classes lack detailed descriptions.
97 <p>Click <a href="CryptoPPRef.zip">here</a> to download a zip archive containing this manual.
98 <p>Thanks to Ryan Phillips for providing the Doxygen configuration file
99 and getting us started on the manual.
100 */
101
102 #ifndef CRYPTOPP_CRYPTLIB_H
103 #define CRYPTOPP_CRYPTLIB_H
104
105 #include "config.h"
106 #include "stdcpp.h"
107 #include "trap.h"
108
109 #if CRYPTOPP_MSC_VERSION
110 # pragma warning(push)
111 # pragma warning(disable: 4127 4189 4505 4702)
112 #endif
113
114 NAMESPACE_BEGIN(CryptoPP)
115
116 // forward declarations
117 class Integer;
118 class RandomNumberGenerator;
119 class BufferedTransformation;
120
121 /// \brief Specifies a direction for a cipher to operate
122 /// \sa BlockTransformation::IsForwardTransformation(), BlockTransformation::IsPermutation(), BlockTransformation::GetCipherDirection()
123 enum CipherDir {
124 /// \brief the cipher is performing encryption
125 ENCRYPTION,
126 /// \brief the cipher is performing decryption
127 DECRYPTION};
128
129 /// \brief Represents infinite time
130 const unsigned long INFINITE_TIME = ULONG_MAX;
131
132 // VC60 workaround: using enums as template parameters causes problems
133 /// \brief Converts an enumeration to a type suitable for use as a template parameter
134 template <typename ENUM_TYPE, int VALUE>
135 struct EnumToType
136 {
137 static ENUM_TYPE ToEnum() {return static_cast<ENUM_TYPE>(VALUE);}
138 };
139
140 /// \brief Provides the byte ordering
141 /// \details Big-endian and little-endian modes are supported. Bi-endian and PDP-endian modes
142 /// are not supported.
143 enum ByteOrder {
144 /// \brief byte order is little-endian
145 LITTLE_ENDIAN_ORDER = 0,
146 /// \brief byte order is big-endian
147 BIG_ENDIAN_ORDER = 1};
148
149 /// \brief Provides a constant for LittleEndian
150 typedef EnumToType<ByteOrder, LITTLE_ENDIAN_ORDER> LittleEndian;
151 /// \brief Provides a constant for BigEndian
152 typedef EnumToType<ByteOrder, BIG_ENDIAN_ORDER> BigEndian;
153
154 /// \brief Base class for all exceptions thrown by the library
155 /// \details All library exceptions directly or indirectly inherit from the Exception class.
156 /// The Exception class itself inherits from std::exception. The library does not use
157 /// std::runtime_error derived classes.
158 class CRYPTOPP_DLL Exception : public std::exception
159 {
160 public:
161 /// \enum ErrorType
162 /// \brief Error types or categories
163 enum ErrorType {
164 /// \brief A method was called which was not implemented
165 NOT_IMPLEMENTED,
166 /// \brief An invalid argument was detected
167 INVALID_ARGUMENT,
168 /// \brief BufferedTransformation received a Flush(true) signal but can't flush buffers
169 CANNOT_FLUSH,
170 /// \brief Data integerity check, such as CRC or MAC, failed
171 DATA_INTEGRITY_CHECK_FAILED,
172 /// \brief Input data was received that did not conform to expected format
173 INVALID_DATA_FORMAT,
174 /// \brief Error reading from input device or writing to output device
175 IO_ERROR,
176 /// \brief Some other error occurred not belonging to other categories
177 OTHER_ERROR
178 };
179
180 virtual ~Exception() throw() {}
181
182 /// \brief Construct a new Exception
183 explicit Exception(ErrorType errorType, const std::string &s) : m_errorType(errorType), m_what(s) {}
184
185 /// \brief Retrieves a C-string describing the exception
186 const char *what() const throw() {return (m_what.c_str());}
187 /// \brief Retrieves a string describing the exception
188 const std::string &GetWhat() const {return m_what;}
189 /// \brief Sets the error string for the exception
190 void SetWhat(const std::string &s) {m_what = s;}
191 /// \brief Retrieves the error type for the exception
192 ErrorType GetErrorType() const {return m_errorType;}
193 /// \brief Sets the error type for the exceptions
194 void SetErrorType(ErrorType errorType) {m_errorType = errorType;}
195
196 private:
197 ErrorType m_errorType;
198 std::string m_what;
199 };
200
201 /// \brief An invalid argument was detected
202 class CRYPTOPP_DLL InvalidArgument : public Exception
203 {
204 public:
205 /// \brief Construct an InvalidArgument
206 /// \param s the message for the exception
207 /// \details The member function <tt>what()</tt> returns <tt>s</tt>.
208 explicit InvalidArgument(const std::string &s) : Exception(INVALID_ARGUMENT, s) {}
209 };
210
211 /// \brief Input data was received that did not conform to expected format
212 class CRYPTOPP_DLL InvalidDataFormat : public Exception
213 {
214 public:
215 /// \brief Construct an InvalidDataFormat
216 /// \param s the message for the exception
217 /// \details The member function <tt>what()</tt> returns <tt>s</tt>.
218 explicit InvalidDataFormat(const std::string &s) : Exception(INVALID_DATA_FORMAT, s) {}
219 };
220
221 /// \brief A decryption filter encountered invalid ciphertext
222 class CRYPTOPP_DLL InvalidCiphertext : public InvalidDataFormat
223 {
224 public:
225 /// \brief Construct an InvalidCiphertext
226 /// \param s the message for the exception
227 /// \details The member function <tt>what()</tt> returns <tt>s</tt>.
228 explicit InvalidCiphertext(const std::string &s) : InvalidDataFormat(s) {}
229 };
230
231 /// \brief A method was called which was not implemented
232 class CRYPTOPP_DLL NotImplemented : public Exception
233 {
234 public:
235 /// \brief Construct an NotImplemented
236 /// \param s the message for the exception
237 /// \details The member function <tt>what()</tt> returns <tt>s</tt>.
238 explicit NotImplemented(const std::string &s) : Exception(NOT_IMPLEMENTED, s) {}
239 };
240
241 /// \brief Flush(true) was called but it can't completely flush its buffers
242 class CRYPTOPP_DLL CannotFlush : public Exception
243 {
244 public:
245 /// \brief Construct an CannotFlush
246 /// \param s the message for the exception
247 /// \details The member function <tt>what()</tt> returns <tt>s</tt>.
248 explicit CannotFlush(const std::string &s) : Exception(CANNOT_FLUSH, s) {}
249 };
250
251 /// \brief The operating system reported an error
252 class CRYPTOPP_DLL OS_Error : public Exception
253 {
254 public:
255 virtual ~OS_Error() throw() {}
256
257 /// \brief Construct an OS_Error
258 /// \param errorType the error type
259 /// \param s the message for the exception
260 /// \param operation the operation for the exception
261 /// \param errorCode the error code
262 /// \details The member function <tt>what()</tt> returns <tt>s</tt>.
263 OS_Error(ErrorType errorType, const std::string &s, const std::string& operation, int errorCode)
264 : Exception(errorType, s), m_operation(operation), m_errorCode(errorCode) {}
265
266 /// \brief Retrieve the operating system API that reported the error
267 const std::string & GetOperation() const {return m_operation;}
268 /// \brief Retrieve the error code returned by the operating system
269 int GetErrorCode() const {return m_errorCode;}
270
271 protected:
272 std::string m_operation;
273 int m_errorCode;
274 };
275
276 /// \brief Returns a decoding results
277 struct CRYPTOPP_DLL DecodingResult
278 {
279 /// \brief Constructs a DecodingResult
280 /// \details isValidCoding is initialized to false and messageLength is
281 /// initialized to 0.
282 explicit DecodingResult() : isValidCoding(false), messageLength(0) {}
283 /// \brief Constructs a DecodingResult
284 /// \param len the message length
285 /// \details isValidCoding is initialized to true.
286 explicit DecodingResult(size_t len) : isValidCoding(true), messageLength(len) {}
287
288 /// \brief Compare two DecodingResult
289 /// \param rhs the other DecodingResult
290 /// \return true if either isValidCoding or messageLength is \a not equal,
291 /// false otherwise
292 bool operator==(const DecodingResult &rhs) const {return isValidCoding == rhs.isValidCoding && messageLength == rhs.messageLength;}
293 /// \brief Compare two DecodingResult
294 /// \param rhs the other DecodingResult
295 /// \return true if either isValidCoding or messageLength is \a not equal,
296 /// false otherwise
297 /// \details Returns <tt>!operator==(rhs)</tt>.
298 bool operator!=(const DecodingResult &rhs) const {return !operator==(rhs);}
299
300 /// \brief Flag to indicate the decoding is valid
301 bool isValidCoding;
302 /// \brief Recovered message length if isValidCoding is true, undefined otherwise
303 size_t messageLength;
304 };
305
306 /// \brief Interface for retrieving values given their names
307 /// \details This class is used to safely pass a variable number of arbitrarily
308 /// typed arguments to functions and to read values from keys and crypto parameters.
309 /// \details To obtain an object that implements NameValuePairs for the purpose of
310 /// parameter passing, use the MakeParameters() function.
311 /// \details To get a value from NameValuePairs, you need to know the name and the
312 /// type of the value. Call GetValueNames() on a NameValuePairs object to obtain a
313 /// list of value names that it supports. then look at the Name namespace
314 /// documentation to see what the type of each value is, or alternatively, call
315 /// GetIntValue() with the value name, and if the type is not int, a
316 /// ValueTypeMismatch exception will be thrown and you can get the actual type from
317 /// the exception object.
318 /// \sa NullNameValuePairs, g_nullNameValuePairs,
319 /// <A HREF="http://www.cryptopp.com/wiki/NameValuePairs">NameValuePairs</A> on the
320 /// Crypto++ wiki
321 class NameValuePairs
322 {
323 public:
324 virtual ~NameValuePairs() {}
325
326 /// \brief Thrown when an unexpected type is encountered
327 /// \details Exception thrown when trying to retrieve a value using a different
328 /// type than expected
329 class CRYPTOPP_DLL ValueTypeMismatch : public InvalidArgument
330 {
331 public:
332 /// \brief Construct a ValueTypeMismatch
333 /// \param name the name of the value
334 /// \param stored the \a actual type of the value stored
335 /// \param retrieving the \a presumed type of the value retrieved
336 ValueTypeMismatch(const std::string &name, const std::type_info &stored, const std::type_info &retrieving)
337 : InvalidArgument("NameValuePairs: type mismatch for '" + name + "', stored '" + stored.name() + "', trying to retrieve '" + retrieving.name() + "'")
338 , m_stored(stored), m_retrieving(retrieving) {}
339
340 /// \brief Provides the stored type
341 /// \return the C++ mangled name of the type
342 const std::type_info & GetStoredTypeInfo() const {return m_stored;}
343
344 /// \brief Provides the retrieveing type
345 /// \return the C++ mangled name of the type
346 const std::type_info & GetRetrievingTypeInfo() const {return m_retrieving;}
347
348 private:
349 const std::type_info &m_stored;
350 const std::type_info &m_retrieving;
351 };
352
353 /// \brief Get a copy of this object or subobject
354 /// \tparam T class or type
355 /// \param object reference to a variable that receives the value
356 template <class T>
357 bool GetThisObject(T &object) const
358 {
359 return GetValue((std::string("ThisObject:")+typeid(T).name()).c_str(), object);
360 }
361
362 /// \brief Get a pointer to this object
363 /// \tparam T class or type
364 /// \param ptr reference to a pointer to a variable that receives the value
365 template <class T>
366 bool GetThisPointer(T *&ptr) const
367 {
368 return GetValue((std::string("ThisPointer:")+typeid(T).name()).c_str(), ptr);
369 }
370
371 /// \brief Get a named value
372 /// \tparam T class or type
373 /// \param name the name of the object or value to retrieve
374 /// \param value reference to a variable that receives the value
375 /// \return true if the value was retrieved, false otherwise
376 /// \sa GetValue(), GetValueWithDefault(), GetIntValue(), GetIntValueWithDefault(),
377 /// GetRequiredParameter() and GetRequiredIntParameter()
378 template <class T>
379 bool GetValue(const char *name, T &value) const
380 {
381 return GetVoidValue(name, typeid(T), &value);
382 }
383
384 /// \brief Get a named value
385 /// \tparam T class or type
386 /// \param name the name of the object or value to retrieve
387 /// \param defaultValue the default value of the class or type if it does not exist
388 /// \return the object or value
389 /// \sa GetValue(), GetValueWithDefault(), GetIntValue(), GetIntValueWithDefault(),
390 /// GetRequiredParameter() and GetRequiredIntParameter()
391 template <class T>
392 T GetValueWithDefault(const char *name, T defaultValue) const
393 {
394 T value;
395 bool result = GetValue(name, value);
396 // No assert... this recovers from failure
397 if (result) {return value;}
398 return defaultValue;
399 }
400
401 /// \brief Get a list of value names that can be retrieved
402 /// \return a list of names available to retrieve
403 /// \details the items in the list are delimited with a colon.
404 CRYPTOPP_DLL std::string GetValueNames() const
405 {std::string result; GetValue("ValueNames", result); return result;}
406
407 /// \brief Get a named value with type int
408 /// \param name the name of the value to retrieve
409 /// \param value the value retrieved upon success
410 /// \return true if an int value was retrieved, false otherwise
411 /// \details GetIntValue() is used to ensure we don't accidentally try to get an
412 /// unsigned int or some other type when we mean int (which is the most common case)
413 /// \sa GetValue(), GetValueWithDefault(), GetIntValue(), GetIntValueWithDefault(),
414 /// GetRequiredParameter() and GetRequiredIntParameter()
415 CRYPTOPP_DLL bool GetIntValue(const char *name, int &value) const
416 {return GetValue(name, value);}
417
418 /// \brief Get a named value with type int, with default
419 /// \param name the name of the value to retrieve
420 /// \param defaultValue the default value if the name does not exist
421 /// \return the value retrieved on success or the default value
422 /// \sa GetValue(), GetValueWithDefault(), GetIntValue(), GetIntValueWithDefault(),
423 /// GetRequiredParameter() and GetRequiredIntParameter()
424 CRYPTOPP_DLL int GetIntValueWithDefault(const char *name, int defaultValue) const
425 {return GetValueWithDefault(name, defaultValue);}
426
427 /// \brief Get a named value with type word64
428 /// \param name the name of the value to retrieve
429 /// \param value the value retrieved upon success
430 /// \return true if an word64 value was retrieved, false otherwise
431 /// \sa GetValue(), GetValueWithDefault(), GetWord64ValueWithDefault(), GetIntValue(),
432 /// GetIntValueWithDefault(), GetRequiredParameter() and GetRequiredIntParameter()
433 CRYPTOPP_DLL bool GetWord64Value(const char *name, word64 &value) const
434 {return GetValue(name, value);}
435
436 /// \brief Get a named value with type word64, with default
437 /// \param name the name of the value to retrieve
438 /// \param defaultValue the default value if the name does not exist
439 /// \return the value retrieved on success or the default value
440 /// \sa GetValue(), GetValueWithDefault(), GetWord64Value(), GetIntValue(),
441 /// GetIntValueWithDefault(), GetRequiredParameter() and GetRequiredWord64Parameter()
442 CRYPTOPP_DLL word64 GetWord64ValueWithDefault(const char *name, word64 defaultValue) const
443 {return GetValueWithDefault(name, defaultValue);}
444
445 /// \brief Ensures an expected name and type is present
446 /// \param name the name of the value
447 /// \param stored the type that was stored for the name
448 /// \param retrieving the type that is being retrieved for the name
449 /// \throw ValueTypeMismatch
450 /// \details ThrowIfTypeMismatch() effectively performs a type safety check.
451 /// stored and retrieving are C++ mangled names for the type.
452 /// \sa GetValue(), GetValueWithDefault(), GetIntValue(), GetIntValueWithDefault(),
453 /// GetRequiredParameter() and GetRequiredIntParameter()
454 CRYPTOPP_DLL static void CRYPTOPP_API ThrowIfTypeMismatch(const char *name, const std::type_info &stored, const std::type_info &retrieving)
455 {if (stored != retrieving) throw ValueTypeMismatch(name, stored, retrieving);}
456
457 /// \brief Retrieves a required name/value pair
458 /// \tparam T class or type
459 /// \param className the name of the class
460 /// \param name the name of the value
461 /// \param value reference to a variable to receive the value
462 /// \throw InvalidArgument
463 /// \details GetRequiredParameter() throws InvalidArgument if the name
464 /// is not present or not of the expected type T.
465 /// \sa GetValue(), GetValueWithDefault(), GetIntValue(), GetIntValueWithDefault(),
466 /// GetRequiredParameter() and GetRequiredIntParameter()
467 template <class T>
468 void GetRequiredParameter(const char *className, const char *name, T &value) const
469 {
470 if (!GetValue(name, value))
471 throw InvalidArgument(std::string(className) + ": missing required parameter '" + name + "'");
472 }
473
474 /// \brief Retrieves a required name/value pair
475 /// \param className the name of the class
476 /// \param name the name of the value
477 /// \param value reference to a variable to receive the value
478 /// \throw InvalidArgument
479 /// \details GetRequiredParameter() throws InvalidArgument if the name
480 /// is not present or not of the expected type T.
481 /// \sa GetValue(), GetValueWithDefault(), GetIntValue(), GetIntValueWithDefault(),
482 /// GetRequiredParameter() and GetRequiredIntParameter()
483 CRYPTOPP_DLL void GetRequiredIntParameter(const char *className, const char *name, int &value) const
484 {
485 if (!GetIntValue(name, value))
486 throw InvalidArgument(std::string(className) + ": missing required parameter '" + name + "'");
487 }
488
489 /// \brief Get a named value
490 /// \param name the name of the object or value to retrieve
491 /// \param valueType reference to a variable that receives the value
492 /// \param pValue void pointer to a variable that receives the value
493 /// \return true if the value was retrieved, false otherwise
494 /// \details GetVoidValue() retrieves the value of name if it exists.
495 /// \note GetVoidValue() is an internal function and should be implemented
496 /// by derived classes. Users should use one of the other functions instead.
497 /// \sa GetValue(), GetValueWithDefault(), GetIntValue(), GetIntValueWithDefault(),
498 /// GetRequiredParameter() and GetRequiredIntParameter()
499 CRYPTOPP_DLL virtual bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const =0;
500 };
501
502 // Doxygen cannot handle initialization
503 #if CRYPTOPP_DOXYGEN_PROCESSING
504 /// \brief Default channel for BufferedTransformation
505 /// \details DEFAULT_CHANNEL is equal to an empty string
506 /// \details The definition for DEFAULT_CHANNEL is in <tt>cryptlib.cpp</tt>.
507 /// It can be subject to <A HREF="https://isocpp.org/wiki/faq/ctors">Static
508 /// Initialization Order Fiasco</A>. If you experience a crash in
509 /// DEFAULT_CHANNEL where the string object is NULL, then you probably have
510 /// a global object using DEFAULT_CHANNEL before it has been constructed.
511 const std::string DEFAULT_CHANNEL;
512
513 /// \brief Channel for additional authenticated data
514 /// \details AAD_CHANNEL is equal to "AAD"
515 /// \details The definition for AAD_CHANNEL is in <tt>cryptlib.cpp</tt>.
516 /// It can be subject to <A HREF="https://isocpp.org/wiki/faq/ctors">Static
517 /// Initialization Order Fiasco</A>. If you experience a crash in
518 /// AAD_CHANNEL where the string object is NULL, then you probably have a
519 /// global object using AAD_CHANNEL before it has been constructed.
520 const std::string AAD_CHANNEL;
521
522 /// \brief An empty set of name-value pairs
523 /// \details The definition for g_nullNameValuePairs is in <tt>cryptlib.cpp</tt>.
524 /// It can be subject to <A HREF="https://isocpp.org/wiki/faq/ctors">Static
525 /// Initialization Order Fiasco</A>. If you experience a crash in
526 /// g_nullNameValuePairs where the string object is NULL, then you probably
527 /// have a global object using g_nullNameValuePairs before it has been
528 /// constructed.
529 const NameValuePairs& g_nullNameValuePairs;
530
531 #else
532 extern CRYPTOPP_DLL const std::string DEFAULT_CHANNEL;
533 extern CRYPTOPP_DLL const std::string AAD_CHANNEL;
534 extern CRYPTOPP_DLL const NameValuePairs& g_nullNameValuePairs;
535 #endif
536
537 // Document additional name spaces which show up elsewhere in the sources.
538 #if CRYPTOPP_DOXYGEN_PROCESSING
539 /// \brief Namespace containing value name definitions.
540 /// \details Name is part of the CryptoPP namespace.
541 /// \details The semantics of value names, types are:
542 /// <pre>
543 /// ThisObject:ClassName (ClassName, copy of this object or a subobject)
544 /// ThisPointer:ClassName (const ClassName *, pointer to this object or a subobject)
545 /// </pre>
546 DOCUMENTED_NAMESPACE_BEGIN(Name)
547 // more names defined in argnames.h
548 DOCUMENTED_NAMESPACE_END
549
550 /// \brief Namespace containing weak and wounded algorithms.
551 /// \details Weak is part of the CryptoPP namespace. Schemes and algorithms are moved into Weak
552 /// when their security level is reduced to an unacceptable level by contemporary standards.
553 /// \details To use an algorithm in the Weak namespace, you must <tt>\c \#define
554 /// CRYPTOPP_ENABLE_NAMESPACE_WEAK 1</tt> before including a header for a weak or wounded
555 /// algorithm. For example:
556 /// <pre> \c \#define CRYPTOPP_ENABLE_NAMESPACE_WEAK 1
557 /// \c \#include <md5.h>
558 /// ...
559 /// CryptoPP::Weak::MD5 md5;
560 /// </pre>
561 DOCUMENTED_NAMESPACE_BEGIN(Weak)
562 // weak and wounded algorithms
563 DOCUMENTED_NAMESPACE_END
564 #endif
565
566 /// \brief Namespace containing NaCl library functions
567 /// \details TweetNaCl is a compact and portable reimplementation of the NaCl library.
568 DOCUMENTED_NAMESPACE_BEGIN(NaCl)
569 // crypto_box, crypto_box_open, crypto_sign, and crypto_sign_open (and friends)
570 DOCUMENTED_NAMESPACE_END
571
572 /// \brief Namespace containing testing and benchmark classes.
573 /// \details Source files for classes in the Test namespaces include
574 /// <tt>test.cpp</tt>, <tt>validat#.cpp</tt> and <tt>bench#.cpp</tt>.
575 DOCUMENTED_NAMESPACE_BEGIN(Test)
576 // testing and benchmark classes
577 DOCUMENTED_NAMESPACE_END
578
579 // ********************************************************
580
581 /// \brief Interface for cloning objects
582 /// \note this is \a not implemented by most classes
583 /// \sa ClonableImpl, NotCopyable
584 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE Clonable
585 {
586 public:
587 virtual ~Clonable() {}
588
589 /// \brief Copies this object
590 /// \return a copy of this object
591 /// \throw NotImplemented
592 /// \note this is \a not implemented by most classes
593 /// \sa NotCopyable
594 virtual Clonable* Clone() const {throw NotImplemented("Clone() is not implemented yet.");} // TODO: make this =0
595 };
596
597 /// \brief Interface for all crypto algorithms
598 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE Algorithm : public Clonable
599 {
600 public:
601 virtual ~Algorithm() {}
602
603 /// \brief Interface for all crypto algorithms
604 /// \param checkSelfTestStatus determines whether the object can proceed if the self
605 /// tests have not been run or failed.
606 /// \details When FIPS 140-2 compliance is enabled and checkSelfTestStatus == true,
607 /// this constructor throws SelfTestFailure if the self test hasn't been run or fails.
608 /// \details FIPS 140-2 compliance is disabled by default. It is only used by certain
609 /// versions of the library when the library is built as a DLL on Windows. Also see
610 /// CRYPTOPP_ENABLE_COMPLIANCE_WITH_FIPS_140_2 in config.h.
611 Algorithm(bool checkSelfTestStatus = true);
612
613 /// \brief Provides the name of this algorithm
614 /// \return the standard algorithm name
615 /// \details The standard algorithm name can be a name like <tt>AES</tt> or <tt>AES/GCM</tt>.
616 /// Some algorithms do not have standard names yet. For example, there is no standard
617 /// algorithm name for Shoup's ECIES.
618 /// \note AlgorithmName is not universally implemented yet.
619 virtual std::string AlgorithmName() const {return "unknown";}
620
621 /// \brief Retrieve the provider of this algorithm
622 /// \return the algorithm provider
623 /// \details The algorithm provider can be a name like "C++", "SSE", "NEON", "AESNI",
624 /// "ARMv8" and "Power8". C++ is standard C++ code. Other labels, like SSE,
625 /// usually indicate a specialized implementation using instructions from a higher
626 /// instruction set architecture (ISA). Future labels may include external hardware
627 /// like a hardware security module (HSM).
628 /// \details Generally speaking Wei Dai's original IA-32 ASM code falls under "SSE2".
629 /// Labels like "SSSE3" and "SSE4.1" follow after Wei's code and use intrinsics
630 /// instead of ASM.
631 /// \details Algorithms which combine different instructions or ISAs provide the
632 /// dominant one. For example on x86 <tt>AES/GCM</tt> returns "AESNI" rather than
633 /// "CLMUL" or "AES+SSE4.1" or "AES+CLMUL" or "AES+SSE4.1+CLMUL".
634 /// \note Provider is not universally implemented yet.
635 /// \since Crypto++ 8.0
636 virtual std::string AlgorithmProvider() const {return "C++";}
637 };
638
639 /// \brief Interface for algorithms that take byte strings as keys
640 /// \sa FixedKeyLength(), VariableKeyLength(), SameKeyLengthAs(), SimpleKeyingInterfaceImpl()
641 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE SimpleKeyingInterface
642 {
643 public:
644 virtual ~SimpleKeyingInterface() {}
645
646 /// \brief Returns smallest valid key length
647 /// \return the minimum key length, in bytes
648 virtual size_t MinKeyLength() const =0;
649
650 /// \brief Returns largest valid key length
651 /// \return the maximum key length, in bytes
652 virtual size_t MaxKeyLength() const =0;
653
654 /// \brief Returns default key length
655 /// \return the default key length, in bytes
656 virtual size_t DefaultKeyLength() const =0;
657
658 /// \brief Returns a valid key length for the algorithm
659 /// \param keylength the size of the key, in bytes
660 /// \return the valid key length, in bytes
661 /// \details keylength is provided in bytes, not bits. If keylength is less than MIN_KEYLENGTH,
662 /// then the function returns MIN_KEYLENGTH. If keylength is greater than MAX_KEYLENGTH,
663 /// then the function returns MAX_KEYLENGTH. if If keylength is a multiple of KEYLENGTH_MULTIPLE,
664 /// then keylength is returned. Otherwise, the function returns a \a lower multiple of
665 /// KEYLENGTH_MULTIPLE.
666 virtual size_t GetValidKeyLength(size_t keylength) const =0;
667
668 /// \brief Returns whether keylength is a valid key length
669 /// \param keylength the requested keylength
670 /// \return true if keylength is valid, false otherwise
671 /// \details Internally the function calls GetValidKeyLength()
672 virtual bool IsValidKeyLength(size_t keylength) const
673 {return keylength == GetValidKeyLength(keylength);}
674
675 /// \brief Sets or reset the key of this object
676 /// \param key the key to use when keying the object
677 /// \param length the size of the key, in bytes
678 /// \param params additional initialization parameters to configure this object
679 virtual void SetKey(const byte *key, size_t length, const NameValuePairs &params = g_nullNameValuePairs);
680
681 /// \brief Sets or reset the key of this object
682 /// \param key the key to use when keying the object
683 /// \param length the size of the key, in bytes
684 /// \param rounds the number of rounds to apply the transformation function,
685 /// if applicable
686 /// \details SetKeyWithRounds() calls SetKey() with a NameValuePairs
687 /// object that only specifies rounds. rounds is an integer parameter,
688 /// and <tt>-1</tt> means use the default number of rounds.
689 void SetKeyWithRounds(const byte *key, size_t length, int rounds);
690
691 /// \brief Sets or reset the key of this object
692 /// \param key the key to use when keying the object
693 /// \param length the size of the key, in bytes
694 /// \param iv the initialization vector to use when keying the object
695 /// \param ivLength the size of the iv, in bytes
696 /// \details SetKeyWithIV() calls SetKey() with a NameValuePairs
697 /// that only specifies IV. The IV is a byte buffer with size ivLength.
698 /// ivLength is an integer parameter, and <tt>-1</tt> means use IVSize().
699 void SetKeyWithIV(const byte *key, size_t length, const byte *iv, size_t ivLength);
700
701 /// \brief Sets or reset the key of this object
702 /// \param key the key to use when keying the object
703 /// \param length the size of the key, in bytes
704 /// \param iv the initialization vector to use when keying the object
705 /// \details SetKeyWithIV() calls SetKey() with a NameValuePairs() object
706 /// that only specifies iv. iv is a byte buffer, and it must have
707 /// a size IVSize().
708 void SetKeyWithIV(const byte *key, size_t length, const byte *iv)
709 {SetKeyWithIV(key, length, iv, IVSize());}
710
711 /// \brief Secure IVs requirements as enumerated values.
712 /// \details Provides secure IV requirements as a monotonically increasing enumerated values.
713 /// Requirements can be compared using less than (&lt;) and greater than (&gt;). For example,
714 /// <tt>UNIQUE_IV &lt; RANDOM_IV</tt> and <tt>UNPREDICTABLE_RANDOM_IV &gt; RANDOM_IV</tt>.
715 /// \details Objects that use SimpleKeyingInterface do not support an optional IV. That is,
716 /// an IV must be present or it must be absent. If you wish to support an optional IV then
717 /// provide two classes - one with an IV and one without an IV.
718 /// \sa IsResynchronizable(), CanUseRandomIVs(), CanUsePredictableIVs(), CanUseStructuredIVs()
719 enum IV_Requirement {
720 /// \brief The IV must be unique
721 UNIQUE_IV = 0,
722 /// \brief The IV must be random and possibly predictable
723 RANDOM_IV,
724 /// \brief The IV must be random and unpredictable
725 UNPREDICTABLE_RANDOM_IV,
726 /// \brief The IV is set by the object
727 INTERNALLY_GENERATED_IV,
728 /// \brief The object does not use an IV
729 NOT_RESYNCHRONIZABLE
730 };
731
732 /// \brief Minimal requirement for secure IVs
733 /// \return the secure IV requirement of the algorithm
734 virtual IV_Requirement IVRequirement() const =0;
735
736 /// \brief Determines if the object can be resynchronized
737 /// \return true if the object can be resynchronized (i.e. supports initialization vectors), false otherwise
738 /// \note If this function returns true, and no IV is passed to SetKey() and <tt>CanUseStructuredIVs()==true</tt>,
739 /// an IV of all 0's will be assumed.
740 bool IsResynchronizable() const {return IVRequirement() < NOT_RESYNCHRONIZABLE;}
741
742 /// \brief Determines if the object can use random IVs
743 /// \return true if the object can use random IVs (in addition to ones returned by GetNextIV), false otherwise
744 bool CanUseRandomIVs() const {return IVRequirement() <= UNPREDICTABLE_RANDOM_IV;}
745
746 /// \brief Determines if the object can use random but possibly predictable IVs
747 /// \return true if the object can use random but possibly predictable IVs (in addition to ones returned by
748 /// GetNextIV), false otherwise
749 bool CanUsePredictableIVs() const {return IVRequirement() <= RANDOM_IV;}
750
751 /// \brief Determines if the object can use structured IVs
752 /// \return true if the object can use structured IVs, false otherwise
753 /// \details CanUseStructuredIVs() indicates whether the object can use structured IVs; for example a counter
754 /// (in addition to ones returned by GetNextIV).
755 bool CanUseStructuredIVs() const {return IVRequirement() <= UNIQUE_IV;}
756
757 /// \brief Returns length of the IV accepted by this object
758 /// \return the size of an IV, in bytes
759 /// \throw NotImplemented() if the object does not support resynchronization
760 /// \details The default implementation throws NotImplemented
761 virtual unsigned int IVSize() const
762 {throw NotImplemented(GetAlgorithm().AlgorithmName() + ": this object doesn't support resynchronization");}
763
764 /// \brief Provides the default size of an IV
765 /// \return default length of IVs accepted by this object, in bytes
766 unsigned int DefaultIVLength() const {return IVSize();}
767
768 /// \brief Provides the minimum size of an IV
769 /// \return minimal length of IVs accepted by this object, in bytes
770 /// \throw NotImplemented() if the object does not support resynchronization
771 virtual unsigned int MinIVLength() const {return IVSize();}
772
773 /// \brief Provides the maximum size of an IV
774 /// \return maximal length of IVs accepted by this object, in bytes
775 /// \throw NotImplemented() if the object does not support resynchronization
776 virtual unsigned int MaxIVLength() const {return IVSize();}
777
778 /// \brief Resynchronize with an IV
779 /// \param iv the initialization vector
780 /// \param ivLength the size of the initialization vector, in bytes
781 /// \details Resynchronize() resynchronizes with an IV provided by the caller. <tt>ivLength=-1</tt> means use IVSize().
782 /// \throw NotImplemented() if the object does not support resynchronization
783 virtual void Resynchronize(const byte *iv, int ivLength=-1) {
784 CRYPTOPP_UNUSED(iv); CRYPTOPP_UNUSED(ivLength);
785 throw NotImplemented(GetAlgorithm().AlgorithmName() + ": this object doesn't support resynchronization");
786 }
787
788 /// \brief Retrieves a secure IV for the next message
789 /// \param rng a RandomNumberGenerator to produce keying material
790 /// \param iv a block of bytes to receive the IV
791 /// \details The IV must be at least IVSize() in length.
792 /// \details This method should be called after you finish encrypting one message and are ready
793 /// to start the next one. After calling it, you must call SetKey() or Resynchronize().
794 /// before using this object again.
795 /// \details Internally, the base class implementation calls RandomNumberGenerator's GenerateBlock()
796 /// \note This method is not implemented on decryption objects.
797 virtual void GetNextIV(RandomNumberGenerator &rng, byte *iv);
798
799 protected:
800 /// \brief Returns the base class Algorithm
801 /// \return the base class Algorithm
802 virtual const Algorithm & GetAlgorithm() const =0;
803
804 /// \brief Sets the key for this object without performing parameter validation
805 /// \param key a byte buffer used to key the cipher
806 /// \param length the length of the byte buffer
807 /// \param params additional parameters passed as NameValuePairs
808 /// \details key must be at least DEFAULT_KEYLENGTH in length.
809 virtual void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs &params) =0;
810
811 /// \brief Validates the key length
812 /// \param length the size of the keying material, in bytes
813 /// \throw InvalidKeyLength if the key length is invalid
814 void ThrowIfInvalidKeyLength(size_t length);
815
816 /// \brief Validates the object
817 /// \throw InvalidArgument if the IV is present
818 /// \details Internally, the default implementation calls IsResynchronizable() and throws
819 /// InvalidArgument if the function returns true.
820 /// \note called when no IV is passed
821 void ThrowIfResynchronizable();
822
823 /// \brief Validates the IV
824 /// \param iv the IV with a length of IVSize, in bytes
825 /// \throw InvalidArgument on failure
826 /// \details Internally, the default implementation checks the iv. If iv is not NULL or nullptr,
827 /// then the function succeeds. If iv is NULL, then IVRequirement is checked against
828 /// UNPREDICTABLE_RANDOM_IV. If IVRequirement is UNPREDICTABLE_RANDOM_IV, then
829 /// then the function succeeds. Otherwise, an exception is thrown.
830 void ThrowIfInvalidIV(const byte *iv);
831
832 /// \brief Validates the IV length
833 /// \param length the size of an IV, in bytes
834 /// \throw InvalidArgument if the IV length is invalid
835 size_t ThrowIfInvalidIVLength(int length);
836
837 /// \brief Retrieves and validates the IV
838 /// \param params NameValuePairs with the IV supplied as a ConstByteArrayParameter
839 /// \param size the length of the IV, in bytes
840 /// \return a pointer to the first byte of the IV
841 /// \throw InvalidArgument if the number of rounds are invalid
842 const byte * GetIVAndThrowIfInvalid(const NameValuePairs &params, size_t &size);
843
844 /// \brief Validates the key length
845 /// \param length the size of the keying material, in bytes
846 inline void AssertValidKeyLength(size_t length) const
847 {CRYPTOPP_UNUSED(length); CRYPTOPP_ASSERT(IsValidKeyLength(length));}
848 };
849
850 /// \brief Interface for the data processing part of block ciphers
851 /// \details Classes derived from BlockTransformation are block ciphers
852 /// in ECB mode (for example the DES::Encryption class), which are stateless.
853 /// These classes should not be used directly, but only in combination with
854 /// a mode class (see CipherModeDocumentation in modes.h).
855 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE BlockTransformation : public Algorithm
856 {
857 public:
858 virtual ~BlockTransformation() {}
859
860 /// \brief Encrypt or decrypt a block
861 /// \param inBlock the input message before processing
862 /// \param outBlock the output message after processing
863 /// \param xorBlock an optional XOR mask
864 /// \details ProcessAndXorBlock encrypts or decrypts inBlock, xor with xorBlock, and write to outBlock.
865 /// \details The size of the block is determined by the block cipher and its documentation. Use
866 /// BLOCKSIZE at compile time, or BlockSize() at runtime.
867 /// \note The message can be transformed in-place, or the buffers must \a not overlap
868 /// \sa FixedBlockSize, BlockCipherFinal from seckey.h and BlockSize()
869 virtual void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const =0;
870
871 /// \brief Encrypt or decrypt a block
872 /// \param inBlock the input message before processing
873 /// \param outBlock the output message after processing
874 /// \details ProcessBlock encrypts or decrypts inBlock and write to outBlock.
875 /// \details The size of the block is determined by the block cipher and its documentation.
876 /// Use BLOCKSIZE at compile time, or BlockSize() at runtime.
877 /// \sa FixedBlockSize, BlockCipherFinal from seckey.h and BlockSize()
878 /// \note The message can be transformed in-place, or the buffers must \a not overlap
879 void ProcessBlock(const byte *inBlock, byte *outBlock) const
880 {ProcessAndXorBlock(inBlock, NULLPTR, outBlock);}
881
882 /// \brief Encrypt or decrypt a block in place
883 /// \param inoutBlock the input message before processing
884 /// \details ProcessBlock encrypts or decrypts inoutBlock in-place.
885 /// \details The size of the block is determined by the block cipher and its documentation.
886 /// Use BLOCKSIZE at compile time, or BlockSize() at runtime.
887 /// \sa FixedBlockSize, BlockCipherFinal from seckey.h and BlockSize()
888 void ProcessBlock(byte *inoutBlock) const
889 {ProcessAndXorBlock(inoutBlock, NULLPTR, inoutBlock);}
890
891 /// Provides the block size of the cipher
892 /// \return the block size of the cipher, in bytes
893 virtual unsigned int BlockSize() const =0;
894
895 /// \brief Provides input and output data alignment for optimal performance.
896 /// \return the input data alignment that provides optimal performance
897 /// \sa GetAlignment() and OptimalBlockSize()
898 virtual unsigned int OptimalDataAlignment() const;
899
900 /// \brief Determines if the transformation is a permutation
901 /// \return true if this is a permutation (i.e. there is an inverse transformation)
902 virtual bool IsPermutation() const {return true;}
903
904 /// \brief Determines if the cipher is being operated in its forward direction
905 /// \return true if DIR is ENCRYPTION, false otherwise
906 /// \sa IsForwardTransformation(), IsPermutation(), GetCipherDirection()
907 virtual bool IsForwardTransformation() const =0;
908
909 /// \brief Determines the number of blocks that can be processed in parallel
910 /// \return the number of blocks that can be processed in parallel, for bit-slicing implementations
911 /// \details Bit-slicing is often used to improve throughput and minimize timing attacks.
912 virtual unsigned int OptimalNumberOfParallelBlocks() const {return 1;}
913
914 /// \brief Bit flags that control AdvancedProcessBlocks() behavior
915 enum FlagsForAdvancedProcessBlocks {
916 /// \brief inBlock is a counter
917 BT_InBlockIsCounter=1,
918 /// \brief should not modify block pointers
919 BT_DontIncrementInOutPointers=2,
920 /// \brief Xor inputs before transformation
921 BT_XorInput=4,
922 /// \brief perform the transformation in reverse
923 BT_ReverseDirection=8,
924 /// \brief Allow parallel transformations
925 BT_AllowParallel=16};
926
927 /// \brief Encrypt and xor multiple blocks using additional flags
928 /// \param inBlocks the input message before processing
929 /// \param xorBlocks an optional XOR mask
930 /// \param outBlocks the output message after processing
931 /// \param length the size of the blocks, in bytes
932 /// \param flags additional flags to control processing
933 /// \details Encrypt and xor multiple blocks according to FlagsForAdvancedProcessBlocks flags.
934 /// \note If BT_InBlockIsCounter is set, then the last byte of inBlocks may be modified.
935 virtual size_t AdvancedProcessBlocks(const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags) const;
936
937 /// \brief Provides the direction of the cipher
938 /// \return ENCRYPTION if IsForwardTransformation() is true, DECRYPTION otherwise
939 /// \sa IsForwardTransformation(), IsPermutation()
940 inline CipherDir GetCipherDirection() const {return IsForwardTransformation() ? ENCRYPTION : DECRYPTION;}
941 };
942
943 /// \brief Interface for the data processing portion of stream ciphers
944 /// \sa StreamTransformationFilter()
945 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE StreamTransformation : public Algorithm
946 {
947 public:
948 virtual ~StreamTransformation() {}
949
950 /// \brief Provides a reference to this object
951 /// \return A reference to this object
952 /// \details Useful for passing a temporary object to a function that takes a non-const reference
953 StreamTransformation& Ref() {return *this;}
954
955 /// \brief Provides the mandatory block size of the cipher
956 /// \return The block size of the cipher if input must be processed in blocks, 1 otherwise
957 /// \details Stream ciphers and some block ciphers modes of operation return 1. Modes that
958 /// return 1 must be able to process a single byte at a time, like counter mode. If a
959 /// mode of operation or block cipher cannot stream then it must not return 1.
960 /// \details When filters operate the mode or cipher, ProcessData will be called with a
961 /// string of bytes that is determined by MandatoryBlockSize and OptimalBlockSize. When a
962 /// policy is set, like 16-byte strings for a 16-byte block cipher, the filter will buffer
963 /// bytes until the specified number of bytes is available to the object.
964 /// \sa ProcessData, ProcessLastBlock, MandatoryBlockSize, MinLastBlockSize, BlockPaddingSchemeDef, IsLastBlockSpecial
965 virtual unsigned int MandatoryBlockSize() const {return 1;}
966
967 /// \brief Provides the input block size most efficient for this cipher
968 /// \return The input block size that is most efficient for the cipher
969 /// \details The base class implementation returns MandatoryBlockSize().
970 /// \note Optimal input length is
971 /// <tt>n * OptimalBlockSize() - GetOptimalBlockSizeUsed()</tt> for any <tt>n > 0</tt>.
972 virtual unsigned int OptimalBlockSize() const {return MandatoryBlockSize();}
973
974 /// \brief Provides the number of bytes used in the current block when processing at optimal block size.
975 /// \return the number of bytes used in the current block when processing at the optimal block size
976 virtual unsigned int GetOptimalBlockSizeUsed() const {return 0;}
977
978 /// \brief Provides input and output data alignment for optimal performance
979 /// \return the input data alignment that provides optimal performance
980 /// \sa GetAlignment() and OptimalBlockSize()
981 virtual unsigned int OptimalDataAlignment() const;
982
983 /// \brief Encrypt or decrypt an array of bytes
984 /// \param outString the output byte buffer
985 /// \param inString the input byte buffer
986 /// \param length the size of the input and output byte buffers, in bytes
987 /// \details ProcessData is called with a string of bytes whose size depends on MandatoryBlockSize.
988 /// Either <tt>inString == outString</tt>, or they must not overlap.
989 /// \sa ProcessData, ProcessLastBlock, MandatoryBlockSize, MinLastBlockSize, BlockPaddingSchemeDef, IsLastBlockSpecial
990 virtual void ProcessData(byte *outString, const byte *inString, size_t length) =0;
991
992 /// \brief Encrypt or decrypt the last block of data
993 /// \param outString the output byte buffer
994 /// \param outLength the size of the output byte buffer, in bytes
995 /// \param inString the input byte buffer
996 /// \param inLength the size of the input byte buffer, in bytes
997 /// \return the number of bytes used in outString
998 /// \details ProcessLastBlock is used when the last block of data is special and requires handling
999 /// by the cipher. The current implementation provides an output buffer with a size
1000 /// <tt>inLength+2*MandatoryBlockSize()</tt>. The return value allows the cipher to expand cipher
1001 /// text during encryption or shrink plain text during decryption.
1002 /// \details This member function is used by CBC-CTS and OCB modes.
1003 /// \sa ProcessData, ProcessLastBlock, MandatoryBlockSize, MinLastBlockSize, BlockPaddingSchemeDef, IsLastBlockSpecial
1004 virtual size_t ProcessLastBlock(byte *outString, size_t outLength, const byte *inString, size_t inLength);
1005
1006 /// \brief Provides the size of the last block
1007 /// \return the minimum size of the last block
1008 /// \details MinLastBlockSize() returns the minimum size of the last block. 0 indicates the last
1009 /// block is not special.
1010 /// \details MandatoryBlockSize() enlists one of two behaviors. First, if MandatoryBlockSize()
1011 /// returns 1, then the cipher can be streamed and ProcessData() is called with the tail bytes.
1012 /// Second, if MandatoryBlockSize() returns non-0, then the string of bytes is padded to
1013 /// MandatoryBlockSize() according to the padding mode. Then, ProcessData() is called with the
1014 /// padded string of bytes.
1015 /// \details Some authenticated encryption modes are not expressed well with MandatoryBlockSize()
1016 /// and MinLastBlockSize(). For example, AES/OCB uses 16-byte blocks (MandatoryBlockSize = 16)
1017 /// and the last block requires special processing (MinLastBlockSize = 0). However, 0 is a valid
1018 /// last block size for OCB and the special processing is custom padding, and not standard PKCS
1019 /// padding. In response an unambiguous IsLastBlockSpecial() was added.
1020 /// \sa ProcessData, ProcessLastBlock, MandatoryBlockSize, MinLastBlockSize, BlockPaddingSchemeDef, IsLastBlockSpecial
1021 virtual unsigned int MinLastBlockSize() const {return 0;}
1022
1023 /// \brief Determines if the last block receives special processing
1024 /// \return true if the last block reveives special processing, false otherwise.
1025 /// \details Some authenticated encryption modes are not expressed well with
1026 /// MandatoryBlockSize() and MinLastBlockSize(). For example, AES/OCB uses
1027 /// 16-byte blocks (MandatoryBlockSize = 16) and the last block requires special processing
1028 /// (MinLastBlockSize = 0). However, 0 is a valid last block size for OCB and the special
1029 /// processing is custom padding, and not standard PKCS padding. In response an
1030 /// unambiguous IsLastBlockSpecial() was added.
1031 /// \details When IsLastBlockSpecial() returns false nothing special happens. All the former
1032 /// rules and behaviors apply. This is the default behavior of IsLastBlockSpecial().
1033 /// \details When IsLastBlockSpecial() returns true four things happen. First, MinLastBlockSize = 0
1034 /// means 0 is a valid block size that should be processed. Second, standard block cipher padding is
1035 /// \a not \a applied. Third, the caller supplies an outString is larger than inString by
1036 /// <tt>2*MandatoryBlockSize()</tt>. That is, there's a reserve available when processing the last block.
1037 /// Fourth, the cipher is responsible for finalization like custom padding. The cipher will tell
1038 /// the library how many bytes were processed or used by returning the appropriate value from
1039 /// ProcessLastBlock().
1040 /// \details The return value of ProcessLastBlock() indicates how many bytes were written to
1041 /// <tt>outString</tt>. A filter pipelining data will send <tt>outString</tt> and up to <tt>outLength</tt>
1042 /// to an <tt>AttachedTransformation()</tt> for additional processing. Below is an example of the code
1043 /// used in <tt>StreamTransformationFilter::LastPut</tt>.
1044 /// <pre> if (m_cipher.IsLastBlockSpecial())
1045 /// {
1046 /// size_t reserve = 2*m_cipher.MandatoryBlockSize();
1047 /// space = HelpCreatePutSpace(*AttachedTransformation(), DEFAULT_CHANNEL, length+reserve);
1048 /// length = m_cipher.ProcessLastBlock(space, length+reserve, inString, length);
1049 /// AttachedTransformation()->Put(space, length);
1050 /// return;
1051 /// }</pre>
1052 /// \sa ProcessData, ProcessLastBlock, MandatoryBlockSize, MinLastBlockSize, BlockPaddingSchemeDef, IsLastBlockSpecial
1053 /// \since Crypto++ 6.0
1054 virtual bool IsLastBlockSpecial() const {return false;}
1055
1056 /// \brief Encrypt or decrypt a string of bytes
1057 /// \param inoutString the string to process
1058 /// \param length the size of the inoutString, in bytes
1059 /// \details Internally, the base class implementation calls ProcessData().
1060 inline void ProcessString(byte *inoutString, size_t length)
1061 {ProcessData(inoutString, inoutString, length);}
1062
1063 /// \brief Encrypt or decrypt a string of bytes
1064 /// \param outString the output string to process
1065 /// \param inString the input string to process
1066 /// \param length the size of the input and output strings, in bytes
1067 /// \details Internally, the base class implementation calls ProcessData().
1068 inline void ProcessString(byte *outString, const byte *inString, size_t length)
1069 {ProcessData(outString, inString, length);}
1070
1071 /// \brief Encrypt or decrypt a byte
1072 /// \param input the input byte to process
1073 /// \details Internally, the base class implementation calls ProcessData() with a size of 1.
1074 inline byte ProcessByte(byte input)
1075 {ProcessData(&input, &input, 1); return input;}
1076
1077 /// \brief Determines whether the cipher supports random access
1078 /// \return true if the cipher supports random access, false otherwise
1079 virtual bool IsRandomAccess() const =0;
1080
1081 /// \brief Seek to an absolute position
1082 /// \param pos position to seek
1083 /// \throw NotImplemented
1084 /// \details The base class implementation throws NotImplemented. The function
1085 /// \ref CRYPTOPP_ASSERT "asserts" IsRandomAccess() in debug builds.
1086 virtual void Seek(lword pos)
1087 {
1088 CRYPTOPP_UNUSED(pos);
1089 CRYPTOPP_ASSERT(!IsRandomAccess());
1090 throw NotImplemented("StreamTransformation: this object doesn't support random access");
1091 }
1092
1093 /// \brief Determines whether the cipher is self-inverting
1094 /// \return true if the cipher is self-inverting, false otherwise
1095 /// \details IsSelfInverting determines whether this transformation is
1096 /// self-inverting (e.g. xor with a keystream).
1097 virtual bool IsSelfInverting() const =0;
1098
1099 /// \brief Determines if the cipher is being operated in its forward direction
1100 /// \return true if DIR is ENCRYPTION, false otherwise
1101 /// \sa IsForwardTransformation(), IsPermutation(), GetCipherDirection()
1102 virtual bool IsForwardTransformation() const =0;
1103 };
1104
1105 /// \brief Interface for hash functions and data processing part of MACs
1106 /// \details HashTransformation objects are stateful. They are created in an initial state,
1107 /// change state as Update() is called, and return to the initial
1108 /// state when Final() is called. This interface allows a large message to
1109 /// be hashed in pieces by calling Update() on each piece followed by
1110 /// calling Final().
1111 /// \sa HashFilter(), HashVerificationFilter()
1112 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE HashTransformation : public Algorithm
1113 {
1114 public:
1115 virtual ~HashTransformation() {}
1116
1117 /// \brief Provides a reference to this object
1118 /// \return A reference to this object
1119 /// \details Useful for passing a temporary object to a function that takes a non-const reference
1120 HashTransformation& Ref() {return *this;}
1121
1122 /// \brief Updates a hash with additional input
1123 /// \param input the additional input as a buffer
1124 /// \param length the size of the buffer, in bytes
1125 virtual void Update(const byte *input, size_t length) =0;
1126
1127 /// \brief Request space which can be written into by the caller
1128 /// \param size the requested size of the buffer
1129 /// \details The purpose of this method is to help avoid extra memory allocations.
1130 /// \details size is an \a IN and \a OUT parameter and used as a hint. When the call is made,
1131 /// size is the requested size of the buffer. When the call returns, size is the size of
1132 /// the array returned to the caller.
1133 /// \details The base class implementation sets size to 0 and returns NULL or nullptr.
1134 /// \note Some objects, like ArraySink, cannot create a space because its fixed.
1135 virtual byte * CreateUpdateSpace(size_t &size) {size=0; return NULLPTR;}
1136
1137 /// \brief Computes the hash of the current message
1138 /// \param digest a pointer to the buffer to receive the hash
1139 /// \details Final() restarts the hash for a new message.
1140 /// \pre <tt>COUNTOF(digest) <= DigestSize()</tt> or <tt>COUNTOF(digest) <= HASH::DIGESTSIZE</tt> ensures
1141 /// the output byte buffer is large enough for the digest.
1142 virtual void Final(byte *digest)
1143 {TruncatedFinal(digest, DigestSize());}
1144
1145 /// \brief Restart the hash
1146 /// \details Discards the current state, and restart for a new message
1147 virtual void Restart()
1148 {TruncatedFinal(NULLPTR, 0);}
1149
1150 /// Provides the digest size of the hash
1151 /// \return the digest size of the hash.
1152 virtual unsigned int DigestSize() const =0;
1153
1154 /// Provides the tag size of the hash
1155 /// \return the tag size of the hash.
1156 /// \details Same as DigestSize().
1157 unsigned int TagSize() const {return DigestSize();}
1158
1159 /// \brief Provides the block size of the compression function
1160 /// \return block size of the compression function, in bytes
1161 /// \details BlockSize() will return 0 if the hash is not block based
1162 /// or does not have an equivalent block size. For example, Keccak
1163 /// and SHA-3 do not have a block size, but they do have an equivalent
1164 /// block size called rate expressed as <tt>r</tt>.
1165 virtual unsigned int BlockSize() const {return 0;}
1166
1167 /// \brief Provides the input block size most efficient for this hash.
1168 /// \return The input block size that is most efficient for the cipher
1169 /// \details The base class implementation returns MandatoryBlockSize().
1170 /// \details Optimal input length is
1171 /// <tt>n * OptimalBlockSize() - GetOptimalBlockSizeUsed()</tt> for any <tt>n > 0</tt>.
1172 virtual unsigned int OptimalBlockSize() const {return 1;}
1173
1174 /// \brief Provides input and output data alignment for optimal performance
1175 /// \return the input data alignment that provides optimal performance
1176 /// \sa GetAlignment() and OptimalBlockSize()
1177 virtual unsigned int OptimalDataAlignment() const;
1178
1179 /// \brief Updates the hash with additional input and computes the hash of the current message
1180 /// \param digest a pointer to the buffer to receive the hash
1181 /// \param input the additional input as a buffer
1182 /// \param length the size of the buffer, in bytes
1183 /// \details Use this if your input is in one piece and you don't want to call Update()
1184 /// and Final() separately
1185 /// \details CalculateDigest() restarts the hash for the next message.
1186 /// \pre <tt>COUNTOF(digest) == DigestSize()</tt> or <tt>COUNTOF(digest) == HASH::DIGESTSIZE</tt> ensures
1187 /// the output byte buffer is a valid size.
1188 virtual void CalculateDigest(byte *digest, const byte *input, size_t length)
1189 {Update(input, length); Final(digest);}
1190
1191 /// \brief Verifies the hash of the current message
1192 /// \param digest a pointer to the buffer of an \a existing hash
1193 /// \return \p true if the existing hash matches the computed hash, \p false otherwise
1194 /// \throw InvalidArgument() if the existing hash's size exceeds DigestSize()
1195 /// \details Verify() performs a bitwise compare on the buffers using VerifyBufsEqual(), which is
1196 /// a constant time comparison function. digestLength cannot exceed DigestSize().
1197 /// \details Verify() restarts the hash for the next message.
1198 /// \pre <tt>COUNTOF(digest) == DigestSize()</tt> or <tt>COUNTOF(digest) == HASH::DIGESTSIZE</tt> ensures
1199 /// the input byte buffer is a valid size.
1200 virtual bool Verify(const byte *digest)
1201 {return TruncatedVerify(digest, DigestSize());}
1202
1203 /// \brief Updates the hash with additional input and verifies the hash of the current message
1204 /// \param digest a pointer to the buffer of an \a existing hash
1205 /// \param input the additional input as a buffer
1206 /// \param length the size of the buffer, in bytes
1207 /// \return \p true if the existing hash matches the computed hash, \p false otherwise
1208 /// \throw InvalidArgument() if the existing hash's size exceeds DigestSize()
1209 /// \details Use this if your input is in one piece and you don't want to call Update()
1210 /// and Verify() separately
1211 /// \details VerifyDigest() performs a bitwise compare on the buffers using VerifyBufsEqual(),
1212 /// which is a constant time comparison function.
1213 /// \details VerifyDigest() restarts the hash for the next message.
1214 /// \pre <tt>COUNTOF(digest) == DigestSize()</tt> or <tt>COUNTOF(digest) == HASH::DIGESTSIZE</tt> ensures
1215 /// the output byte buffer is a valid size.
1216 virtual bool VerifyDigest(const byte *digest, const byte *input, size_t length)
1217 {Update(input, length); return Verify(digest);}
1218
1219 /// \brief Computes the hash of the current message
1220 /// \param digest a pointer to the buffer to receive the hash
1221 /// \param digestSize the size of the truncated digest, in bytes
1222 /// \details TruncatedFinal() call Final() and then copies digestSize bytes to digest.
1223 /// The hash is restarted the hash for the next message.
1224 /// \pre <tt>COUNTOF(digest) <= DigestSize()</tt> or <tt>COUNTOF(digest) <= HASH::DIGESTSIZE</tt> ensures
1225 /// the output byte buffer is a valid size.
1226 virtual void TruncatedFinal(byte *digest, size_t digestSize) =0;
1227
1228 /// \brief Updates the hash with additional input and computes the hash of the current message
1229 /// \param digest a pointer to the buffer to receive the hash
1230 /// \param digestSize the length of the truncated hash, in bytes
1231 /// \param input the additional input as a buffer
1232 /// \param length the size of the buffer, in bytes
1233 /// \details Use this if your input is in one piece and you don't want to call Update()
1234 /// and CalculateDigest() separately.
1235 /// \details CalculateTruncatedDigest() restarts the hash for the next message.
1236 /// \pre <tt>digestSize <= DigestSize()</tt> or <tt>digestSize <= HASH::DIGESTSIZE</tt> ensures
1237 /// the output byte buffer is a valid size.
1238 virtual void CalculateTruncatedDigest(byte *digest, size_t digestSize, const byte *input, size_t length)
1239 {Update(input, length); TruncatedFinal(digest, digestSize);}
1240
1241 /// \brief Verifies the hash of the current message
1242 /// \param digest a pointer to the buffer of an \a existing hash
1243 /// \param digestLength the size of the truncated hash, in bytes
1244 /// \return \p true if the existing hash matches the computed hash, \p false otherwise
1245 /// \throw InvalidArgument() if digestLength exceeds DigestSize()
1246 /// \details TruncatedVerify() is a truncated version of Verify(). It can operate on a
1247 /// buffer smaller than DigestSize(). However, digestLength cannot exceed DigestSize().
1248 /// \details Verify() performs a bitwise compare on the buffers using VerifyBufsEqual(), which is
1249 /// a constant time comparison function. digestLength cannot exceed DigestSize().
1250 /// \details TruncatedVerify() restarts the hash for the next message.
1251 /// \pre <tt>digestLength <= DigestSize()</tt> or <tt>digestLength <= HASH::DIGESTSIZE</tt> ensures
1252 /// the input byte buffer is a valid size.
1253 virtual bool TruncatedVerify(const byte *digest, size_t digestLength);
1254
1255 /// \brief Updates the hash with additional input and verifies the hash of the current message
1256 /// \param digest a pointer to the buffer of an \a existing hash
1257 /// \param digestLength the size of the truncated hash, in bytes
1258 /// \param input the additional input as a buffer
1259 /// \param length the size of the buffer, in bytes
1260 /// \return \p true if the existing hash matches the computed hash, \p false otherwise
1261 /// \throw InvalidArgument() if digestLength exceeds DigestSize()
1262 /// \details Use this if your input is in one piece and you don't want to call Update()
1263 /// and TruncatedVerify() separately.
1264 /// \details VerifyTruncatedDigest() is a truncated version of VerifyDigest(). It can operate
1265 /// on a buffer smaller than DigestSize(). However, digestLength cannot exceed DigestSize().
1266 /// \details VerifyTruncatedDigest() restarts the hash for the next message.
1267 /// \pre <tt>digestLength <= DigestSize()</tt> or <tt>digestLength <= HASH::DIGESTSIZE</tt> ensures
1268 /// the input byte buffer is a valid size.
1269 virtual bool VerifyTruncatedDigest(const byte *digest, size_t digestLength, const byte *input, size_t length)
1270 {Update(input, length); return TruncatedVerify(digest, digestLength);}
1271
1272 protected:
1273 /// \brief Validates a truncated digest size
1274 /// \param size the requested digest size
1275 /// \throw InvalidArgument if the algorithm's digest size cannot be truncated to the requested size
1276 /// \details Throws an exception when the truncated digest size is greater than DigestSize()
1277 void ThrowIfInvalidTruncatedSize(size_t size) const;
1278 };
1279
1280 /// \brief Interface for one direction (encryption or decryption) of a block cipher
1281 /// \details These objects usually should not be used directly. See BlockTransformation for more details.
1282 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE BlockCipher : public SimpleKeyingInterface, public BlockTransformation
1283 {
1284 protected:
1285 const Algorithm & GetAlgorithm() const {return *this;}
1286 };
1287
1288 /// \brief Interface for one direction (encryption or decryption) of a stream cipher or cipher mode
1289 /// \details These objects usually should not be used directly. See StreamTransformation for more details.
1290 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE SymmetricCipher : public SimpleKeyingInterface, public StreamTransformation
1291 {
1292 protected:
1293 const Algorithm & GetAlgorithm() const {return *this;}
1294 };
1295
1296 /// \brief Interface for message authentication codes
1297 /// \details These objects usually should not be used directly. See HashTransformation for more details.
1298 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE MessageAuthenticationCode : public SimpleKeyingInterface, public HashTransformation
1299 {
1300 protected:
1301 const Algorithm & GetAlgorithm() const {return *this;}
1302 };
1303
1304 /// \brief Interface for authenticated encryption modes of operation
1305 /// \details AuthenticatedSymmetricCipher() provides the interface for one direction
1306 /// (encryption or decryption) of a stream cipher or block cipher mode with authentication. The
1307 /// StreamTransformation() part of this interface is used to encrypt or decrypt the data. The
1308 /// MessageAuthenticationCode() part of the interface is used to input additional authenticated
1309 /// data (AAD), which is MAC'ed but not encrypted. The MessageAuthenticationCode() part is also
1310 /// used to generate and verify the MAC.
1311 /// \details Crypto++ provides four authenticated encryption modes of operation - CCM, EAX, GCM
1312 /// and OCB mode. All modes implement AuthenticatedSymmetricCipher() and the motivation for
1313 /// the API, like calling AAD a &quot;header&quot;, can be found in Bellare, Rogaway and
1314 /// Wagner's <A HREF="http://web.cs.ucdavis.edu/~rogaway/papers/eax.pdf">The EAX Mode of
1315 /// Operation</A>. The EAX paper suggested a basic API to help standardize AEAD schemes in
1316 /// software and promote adoption of the modes.
1317 /// \sa <A HREF="http://www.cryptopp.com/wiki/Authenticated_Encryption">Authenticated
1318 /// Encryption</A> on the Crypto++ wiki.
1319 /// \since Crypto++ 5.6.0
1320 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE AuthenticatedSymmetricCipher : public MessageAuthenticationCode, public StreamTransformation
1321 {
1322 public:
1323 virtual ~AuthenticatedSymmetricCipher() {}
1324
1325 /// \brief Exception thrown when the object is in the wrong state for the operation
1326 /// \details this indicates that a member function was called in the wrong state, for example trying to encrypt
1327 /// a message before having set the key or IV
1328 class BadState : public Exception
1329 {
1330 public:
1331 explicit BadState(const std::string &name, const char *message) : Exception(OTHER_ERROR, name + ": " + message) {}
1332 explicit BadState(const std::string &name, const char *function, const char *state) : Exception(OTHER_ERROR, name + ": " + function + " was called before " + state) {}
1333 };
1334
1335 /// \brief Provides the maximum length of AAD that can be input
1336 /// \return the maximum length of AAD that can be input before the encrypted data
1337 virtual lword MaxHeaderLength() const =0;
1338
1339 /// \brief Provides the maximum length of encrypted data
1340 /// \return the maximum length of encrypted data
1341 virtual lword MaxMessageLength() const =0;
1342
1343 /// \brief Provides the maximum length of AAD
1344 /// \return the maximum length of AAD that can be input after the encrypted data
1345 virtual lword MaxFooterLength() const {return 0;}
1346
1347 /// \brief Determines if data lengths must be specified prior to inputting data
1348 /// \return true if the data lengths are required before inputting data, false otherwise
1349 /// \details if this function returns true, SpecifyDataLengths() must be called before attempting to input data.
1350 /// This is the case for some schemes, such as CCM.
1351 /// \sa SpecifyDataLengths()
1352 virtual bool NeedsPrespecifiedDataLengths() const {return false;}
1353
1354 /// \brief Prescribes the data lengths
1355 /// \param headerLength size of data before message is input, in bytes
1356 /// \param messageLength size of the message, in bytes
1357 /// \param footerLength size of data after message is input, in bytes
1358 /// \details SpecifyDataLengths() only needs to be called if NeedsPrespecifiedDataLengths() returns <tt>true</tt>.
1359 /// If <tt>true</tt>, then <tt>headerLength</tt> will be validated against <tt>MaxHeaderLength()</tt>,
1360 /// <tt>messageLength</tt> will be validated against <tt>MaxMessageLength()</tt>, and
1361 /// <tt>footerLength</tt> will be validated against <tt>MaxFooterLength()</tt>.
1362 /// \sa NeedsPrespecifiedDataLengths()
1363 void SpecifyDataLengths(lword headerLength, lword messageLength, lword footerLength=0);
1364
1365 /// \brief Encrypts and calculates a MAC in one call
1366 /// \param ciphertext the encryption buffer
1367 /// \param mac the mac buffer
1368 /// \param macSize the size of the MAC buffer, in bytes
1369 /// \param iv the iv buffer
1370 /// \param ivLength the size of the IV buffer, in bytes
1371 /// \param header the AAD buffer
1372 /// \param headerLength the size of the AAD buffer, in bytes
1373 /// \param message the message buffer
1374 /// \param messageLength the size of the messagetext buffer, in bytes
1375 /// \details EncryptAndAuthenticate() encrypts and generates the MAC in one call. The function
1376 /// truncates the MAC if <tt>macSize < TagSize()</tt>.
1377 virtual void EncryptAndAuthenticate(byte *ciphertext, byte *mac, size_t macSize, const byte *iv, int ivLength, const byte *header, size_t headerLength, const byte *message, size_t messageLength);
1378
1379 /// \brief Decrypts and verifies a MAC in one call
1380 /// \param message the decryption buffer
1381 /// \param mac the mac buffer
1382 /// \param macSize the size of the MAC buffer, in bytes
1383 /// \param iv the iv buffer
1384 /// \param ivLength the size of the IV buffer, in bytes
1385 /// \param header the AAD buffer
1386 /// \param headerLength the size of the AAD buffer, in bytes
1387 /// \param ciphertext the ciphertext buffer
1388 /// \param ciphertextLength the size of the ciphertext buffer, in bytes
1389 /// \return true if the MAC is valid and the decoding succeeded, false otherwise
1390 /// \details DecryptAndVerify() decrypts and verifies the MAC in one call.
1391 /// <tt>message</tt> is a decryption buffer and should be at least as large as the ciphertext buffer.
1392 /// \details The function returns true iff MAC is valid. DecryptAndVerify() assumes the MAC
1393 /// is truncated if <tt>macLength < TagSize()</tt>.
1394 virtual bool DecryptAndVerify(byte *message, const byte *mac, size_t macSize, const byte *iv, int ivLength, const byte *header, size_t headerLength, const byte *ciphertext, size_t ciphertextLength);
1395
1396 /// \brief Provides the name of this algorithm
1397 /// \return the standard algorithm name
1398 /// \details The standard algorithm name can be a name like \a AES or \a AES/GCM. Some algorithms
1399 /// do not have standard names yet. For example, there is no standard algorithm name for
1400 /// Shoup's ECIES.
1401 virtual std::string AlgorithmName() const;
1402
1403 protected:
1404 const Algorithm & GetAlgorithm() const
1405 {return *static_cast<const MessageAuthenticationCode *>(this);}
1406 virtual void UncheckedSpecifyDataLengths(lword headerLength, lword messageLength, lword footerLength)
1407 {CRYPTOPP_UNUSED(headerLength); CRYPTOPP_UNUSED(messageLength); CRYPTOPP_UNUSED(footerLength);}
1408 };
1409
1410 /// \brief Interface for random number generators
1411 /// \details The library provides a number of random number generators, from software based
1412 /// to hardware based generators.
1413 /// \details All generated values are uniformly distributed over the range specified.
1414 /// \since Crypto++ 3.1
1415 /// \sa <A HREF="https://www.cryptopp.com/wiki/RandomNumberGenerator">RandomNumberGenerator</A>
1416 /// on the Crypto++ wiki
1417 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE RandomNumberGenerator : public Algorithm
1418 {
1419 public:
1420 virtual ~RandomNumberGenerator() {}
1421
1422 /// \brief Update RNG state with additional unpredictable values
1423 /// \param input the entropy to add to the generator
1424 /// \param length the size of the input buffer
1425 /// \throw NotImplemented
1426 /// \details A generator may or may not accept additional entropy. Call CanIncorporateEntropy()
1427 /// to test for the ability to use additional entropy.
1428 /// \details If a derived class does not override IncorporateEntropy(), then the base class
1429 /// throws NotImplemented.
1430 virtual void IncorporateEntropy(const byte *input, size_t length)
1431 {
1432 CRYPTOPP_UNUSED(input); CRYPTOPP_UNUSED(length);
1433 throw NotImplemented("RandomNumberGenerator: IncorporateEntropy not implemented");
1434 }
1435
1436 /// \brief Determines if a generator can accept additional entropy
1437 /// \return true if IncorporateEntropy() is implemented
1438 virtual bool CanIncorporateEntropy() const {return false;}
1439
1440 /// \brief Generate new random byte and return it
1441 /// \return a random 8-bit byte
1442 /// \details Default implementation calls GenerateBlock() with one byte.
1443 /// \details All generated values are uniformly distributed over the range specified within the
1444 /// the constraints of a particular generator.
1445 virtual byte GenerateByte();
1446
1447 /// \brief Generate new random bit and return it
1448 /// \return a random bit
1449 /// \details The default implementation calls GenerateByte() and return its lowest bit.
1450 /// \details All generated values are uniformly distributed over the range specified within the
1451 /// the constraints of a particular generator.
1452 virtual unsigned int GenerateBit();
1453
1454 /// \brief Generate a random 32 bit word in the range min to max, inclusive
1455 /// \param min the lower bound of the range
1456 /// \param max the upper bound of the range
1457 /// \return a random 32-bit word
1458 /// \details The default implementation calls Crop() on the difference between max and
1459 /// min, and then returns the result added to min.
1460 /// \details All generated values are uniformly distributed over the range specified within the
1461 /// the constraints of a particular generator.
1462 virtual word32 GenerateWord32(word32 min=0, word32 max=0xffffffffUL);
1463
1464 /// \brief Generate random array of bytes
1465 /// \param output the byte buffer
1466 /// \param size the length of the buffer, in bytes
1467 /// \details All generated values are uniformly distributed over the range specified within the
1468 /// the constraints of a particular generator.
1469 /// \note A derived generator \a must override either GenerateBlock() or
1470 /// GenerateIntoBufferedTransformation(). They can override both, or have one call the other.
1471 virtual void GenerateBlock(byte *output, size_t size);
1472
1473 /// \brief Generate random bytes into a BufferedTransformation
1474 /// \param target the BufferedTransformation object which receives the bytes
1475 /// \param channel the channel on which the bytes should be pumped
1476 /// \param length the number of bytes to generate
1477 /// \details The default implementation calls GenerateBlock() and pumps the result into
1478 /// the DEFAULT_CHANNEL of the target.
1479 /// \details All generated values are uniformly distributed over the range specified within the
1480 /// the constraints of a particular generator.
1481 /// \note A derived generator \a must override either GenerateBlock() or
1482 /// GenerateIntoBufferedTransformation(). They can override both, or have one call the other.
1483 virtual void GenerateIntoBufferedTransformation(BufferedTransformation &target, const std::string &channel, lword length);
1484
1485 /// \brief Generate and discard n bytes
1486 /// \param n the number of bytes to generate and discard
1487 virtual void DiscardBytes(size_t n);
1488
1489 /// \brief Randomly shuffle the specified array
1490 /// \param begin an iterator to the first element in the array
1491 /// \param end an iterator beyond the last element in the array
1492 /// \details The resulting permutation is uniformly distributed.
1493 template <class IT> void Shuffle(IT begin, IT end)
1494 {
1495 // TODO: What happens if there are more than 2^32 elements?
1496 for (; begin != end; ++begin)
1497 std::iter_swap(begin, begin + GenerateWord32(0, static_cast<word32>(end-begin-1)));
1498 }
1499 };
1500
1501 /// \brief Interface for key derivation functions
1502 /// \since Crypto++ 7.0
1503 /// \sa <A HREF="https://www.cryptopp.com/wiki/KeyDerivationFunction">KeyDerivationFunction</A>
1504 /// on the Crypto++ wiki
1505 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE KeyDerivationFunction : public Algorithm
1506 {
1507 public:
1508 virtual ~KeyDerivationFunction() {}
1509
1510 /// \brief Provides the name of this algorithm
1511 /// \return the standard algorithm name
1512 virtual std::string AlgorithmName() const =0;
1513
1514 /// \brief Determine minimum number of bytes
1515 /// \return Minimum number of bytes which can be derived
1516 virtual size_t MinDerivedKeyLength() const;
1517
1518 /// \brief Determine maximum number of bytes
1519 /// \return Maximum number of bytes which can be derived
1520 virtual size_t MaxDerivedKeyLength() const;
1521
1522 /// \brief Returns a valid key length for the derivation function
1523 /// \param keylength the size of the derived key, in bytes
1524 /// \return the valid key length, in bytes
1525 virtual size_t GetValidDerivedLength(size_t keylength) const =0;
1526
1527 /// \brief Returns whether keylength is a valid key length
1528 /// \param keylength the requested keylength
1529 /// \return true if the derived keylength is valid, false otherwise
1530 /// \details Internally the function calls GetValidKeyLength()
1531 virtual bool IsValidDerivedLength(size_t keylength) const {
1532 return keylength == GetValidDerivedLength(keylength);
1533 }
1534
1535 /// \brief Derive a key from a seed
1536 /// \param derived the derived output buffer
1537 /// \param derivedLen the size of the derived buffer, in bytes
1538 /// \param secret the seed input buffer
1539 /// \param secretLen the size of the secret buffer, in bytes
1540 /// \param params additional initialization parameters to configure this object
1541 /// \return the number of iterations performed
1542 /// \throw InvalidDerivedKeyLength if <tt>derivedLen</tt> is invalid for the scheme
1543 /// \details DeriveKey() provides a standard interface to derive a key from
1544 /// a secret seed and other parameters. Each class that derives from KeyDerivationFunction
1545 /// provides an overload that accepts most parameters used by the derivation function.
1546 /// \details the number of iterations performed by DeriveKey() may be 1. For example, a
1547 /// scheme like HKDF does not use the iteration count so it returns 1.
1548 virtual size_t DeriveKey(byte *derived, size_t derivedLen, const byte *secret, size_t secretLen, const NameValuePairs& params = g_nullNameValuePairs) const =0;
1549
1550 /// \brief Set or change parameters
1551 /// \param params additional initialization parameters to configure this object
1552 /// \details SetParameters() is useful for setting common parameters when an object is
1553 /// reused. Some derivation function classes may choose to implement it.
1554 virtual void SetParameters(const NameValuePairs& params);
1555
1556 protected:
1557 /// \brief Returns the base class Algorithm
1558 /// \return the base class Algorithm
1559 virtual const Algorithm & GetAlgorithm() const =0;
1560
1561 /// \brief Validates the derived key length
1562 /// \param length the size of the derived key material, in bytes
1563 /// \throw InvalidKeyLength if the key length is invalid
1564 void ThrowIfInvalidDerivedKeyLength(size_t length) const;
1565 };
1566
1567 /// \brief Interface for password based key derivation functions
1568 /// \since Crypto++ 7.0
1569 struct PasswordBasedKeyDerivationFunction : public KeyDerivationFunction
1570 {
1571 };
1572
1573 /// \brief Random Number Generator that does not produce random numbers
1574 /// \return reference that can be passed to functions that require a RandomNumberGenerator
1575 /// \details NullRNG() returns a reference that can be passed to functions that require a
1576 /// RandomNumberGenerator but don't actually use it. The NullRNG() throws NotImplemented
1577 /// when a generation function is called.
1578 /// \sa ClassNullRNG, PK_SignatureScheme::IsProbabilistic()
1579 CRYPTOPP_DLL RandomNumberGenerator & CRYPTOPP_API NullRNG();
1580
1581 class WaitObjectContainer;
1582 class CallStack;
1583
1584 /// \brief Interface for objects that can be waited on.
1585 class CRYPTOPP_NO_VTABLE Waitable
1586 {
1587 public:
1588 virtual ~Waitable() {}
1589
1590 /// \brief Maximum number of wait objects that this object can return
1591 /// \return the maximum number of wait objects
1592 virtual unsigned int GetMaxWaitObjectCount() const =0;
1593
1594 /// \brief Retrieves waitable objects
1595 /// \param container the wait container to receive the references to the objects.
1596 /// \param callStack CallStack() object used to select waitable objects
1597 /// \details GetWaitObjects() is usually called in one of two ways. First, it can
1598 /// be called like <tt>something.GetWaitObjects(c, CallStack("my func after X", 0));</tt>.
1599 /// Second, if in an outer GetWaitObjects() method that itself takes a callStack
1600 /// parameter, it can be called like
1601 /// <tt>innerThing.GetWaitObjects(c, CallStack("MyClass::GetWaitObjects at X", &callStack));</tt>.
1602 virtual void GetWaitObjects(WaitObjectContainer &container, CallStack const& callStack) =0;
1603
1604 /// \brief Wait on this object
1605 /// \return true if the wait succeeded, false otherwise
1606 /// \details Wait() is the same as creating an empty container, calling GetWaitObjects(), and then calling
1607 /// Wait() on the container.
1608 bool Wait(unsigned long milliseconds, CallStack const& callStack);
1609 };
1610
1611 /// \brief Interface for buffered transformations
1612 /// \details BufferedTransformation is a generalization of BlockTransformation,
1613 /// StreamTransformation and HashTransformation.
1614 /// \details A buffered transformation is an object that takes a stream of bytes as input (this may
1615 /// be done in stages), does some computation on them, and then places the result into an internal
1616 /// buffer for later retrieval. Any partial result already in the output buffer is not modified
1617 /// by further input.
1618 /// \details If a method takes a "blocking" parameter, and you pass false for it, then the method
1619 /// will return before all input has been processed if the input cannot be processed without waiting
1620 /// (for network buffers to become available, for example). In this case the method will return true
1621 /// or a non-zero integer value. When this happens you must continue to call the method with the same
1622 /// parameters until it returns false or zero, before calling any other method on it or attached
1623 /// BufferedTransformation. The integer return value in this case is approximately
1624 /// the number of bytes left to be processed, and can be used to implement a progress bar.
1625 /// \details For functions that take a "propagation" parameter, <tt>propagation != 0</tt> means pass on
1626 /// the signal to attached BufferedTransformation objects, with propagation decremented at each
1627 /// step until it reaches <tt>0</tt>. <tt>-1</tt> means unlimited propagation.
1628 /// \details \a All of the retrieval functions, like Get() and GetWord32(), return the actual
1629 /// number of bytes retrieved, which is the lesser of the request number and MaxRetrievable().
1630 /// \details \a Most of the input functions, like Put() and PutWord32(), return the number of
1631 /// bytes remaining to be processed. A 0 value means all bytes were processed, and a non-0 value
1632 /// means bytes remain to be processed.
1633 /// \nosubgrouping
1634 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE BufferedTransformation : public Algorithm, public Waitable
1635 {
1636 public:
1637 virtual ~BufferedTransformation() {}
1638
1639 /// \brief Construct a BufferedTransformation
1640 BufferedTransformation() : Algorithm(false) {}
1641
1642 /// \brief Provides a reference to this object
1643 /// \return A reference to this object
1644 /// \details Useful for passing a temporary object to a function that takes a non-const reference
1645 BufferedTransformation& Ref() {return *this;}
1646
1647 /// \name INPUT
1648 //@{
1649
1650 /// \brief Input a byte for processing
1651 /// \param inByte the 8-bit byte (octet) to be processed.
1652 /// \param blocking specifies whether the object should block when processing input.
1653 /// \return the number of bytes that remain to be processed (i.e., bytes not processed).
1654 /// 0 indicates all bytes were processed.
1655 /// \details <tt>Put(byte)</tt> calls <tt>Put(byte*, size_t)</tt>.
1656 size_t Put(byte inByte, bool blocking=true)
1657 {return Put(&inByte, 1, blocking);}
1658
1659 /// \brief Input a byte buffer for processing
1660 /// \param inString the byte buffer to process
1661 /// \param length the size of the string, in bytes
1662 /// \param blocking specifies whether the object should block when processing input
1663 /// \return the number of bytes that remain to be processed (i.e., bytes not processed).
1664 /// 0 indicates all bytes were processed.
1665 /// \details Internally, Put() calls Put2().
1666 size_t Put(const byte *inString, size_t length, bool blocking=true)
1667 {return Put2(inString, length, 0, blocking);}
1668
1669 /// Input a 16-bit word for processing.
1670 /// \param value the 16-bit value to be processed
1671 /// \param order the ByteOrder of the value to be processed.
1672 /// \param blocking specifies whether the object should block when processing input
1673 /// \return the number of bytes that remain to be processed (i.e., bytes not processed).
1674 /// 0 indicates all bytes were processed.
1675 size_t PutWord16(word16 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true);
1676
1677 /// Input a 32-bit word for processing.
1678 /// \param value the 32-bit value to be processed.
1679 /// \param order the ByteOrder of the value to be processed.
1680 /// \param blocking specifies whether the object should block when processing input.
1681 /// \return the number of bytes that remain to be processed (i.e., bytes not processed).
1682 /// 0 indicates all bytes were processed.
1683 size_t PutWord32(word32 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true);
1684
1685 /// Input a 64-bit word for processing.
1686 /// \param value the 64-bit value to be processed.
1687 /// \param order the ByteOrder of the value to be processed.
1688 /// \param blocking specifies whether the object should block when processing input.
1689 /// \return the number of bytes that remain to be processed (i.e., bytes not processed).
1690 /// 0 indicates all bytes were processed.
1691 size_t PutWord64(word64 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true);
1692
1693 /// \brief Request space which can be written into by the caller
1694 /// \param size the requested size of the buffer
1695 /// \return byte pointer to the space to input data
1696 /// \details The purpose of this method is to help avoid extra memory allocations.
1697 /// \details size is an \a IN and \a OUT parameter and used as a hint. When the call is made,
1698 /// size is the requested size of the buffer. When the call returns, size is the size of
1699 /// the array returned to the caller.
1700 /// \details The base class implementation sets size to 0 and returns NULL.
1701 /// \note Some objects, like ArraySink, cannot create a space because its fixed. In the case of
1702 /// an ArraySink, the pointer to the array is returned and the size is remaining size.
1703 virtual byte * CreatePutSpace(size_t &size)
1704 {size=0; return NULLPTR;}
1705
1706 /// \brief Determines whether input can be modified by the callee
1707 /// \return true if input can be modified, false otherwise
1708 /// \details The base class implementation returns false.
1709 virtual bool CanModifyInput() const
1710 {return false;}
1711
1712 /// \brief Input multiple bytes that may be modified by callee.
1713 /// \param inString the byte buffer to process
1714 /// \param length the size of the string, in bytes
1715 /// \param blocking specifies whether the object should block when processing input
1716 /// \return the number of bytes that remain to be processed (i.e., bytes not processed). 0 indicates all
1717 /// bytes were processed.
1718 size_t PutModifiable(byte *inString, size_t length, bool blocking=true)
1719 {return PutModifiable2(inString, length, 0, blocking);}
1720
1721 /// \brief Signals the end of messages to the object
1722 /// \param propagation the number of attached transformations the MessageEnd() signal should be passed
1723 /// \param blocking specifies whether the object should block when processing input
1724 /// \details propagation count includes this object. Setting propagation to <tt>1</tt> means this
1725 /// object only. Setting propagation to <tt>-1</tt> means unlimited propagation.
1726 bool MessageEnd(int propagation=-1, bool blocking=true)
1727 {return !!Put2(NULLPTR, 0, propagation < 0 ? -1 : propagation+1, blocking);}
1728
1729 /// \brief Input multiple bytes for processing and signal the end of a message
1730 /// \param inString the byte buffer to process
1731 /// \param length the size of the string, in bytes
1732 /// \param propagation the number of attached transformations the MessageEnd() signal should be passed
1733 /// \param blocking specifies whether the object should block when processing input
1734 /// \return the number of bytes that remain to be processed (i.e., bytes not processed). 0 indicates all
1735 /// bytes were processed.
1736 /// \details Internally, PutMessageEnd() calls Put2() with a modified propagation to
1737 /// ensure all attached transformations finish processing the message.
1738 /// \details propagation count includes this object. Setting propagation to <tt>1</tt> means this
1739 /// object only. Setting propagation to <tt>-1</tt> means unlimited propagation.
1740 size_t PutMessageEnd(const byte *inString, size_t length, int propagation=-1, bool blocking=true)
1741 {return Put2(inString, length, propagation < 0 ? -1 : propagation+1, blocking);}
1742
1743 /// \brief Input multiple bytes for processing
1744 /// \param inString the byte buffer to process
1745 /// \param length the size of the string, in bytes
1746 /// \param messageEnd means how many filters to signal MessageEnd() to, including this one
1747 /// \param blocking specifies whether the object should block when processing input
1748 /// \return the number of bytes that remain to be processed (i.e., bytes not processed). 0 indicates all
1749 /// bytes were processed.
1750 /// \details Derived classes must implement Put2().
1751 virtual size_t Put2(const byte *inString, size_t length, int messageEnd, bool blocking) =0;
1752
1753 /// \brief Input multiple bytes that may be modified by callee.
1754 /// \param inString the byte buffer to process.
1755 /// \param length the size of the string, in bytes.
1756 /// \param messageEnd means how many filters to signal MessageEnd() to, including this one.
1757 /// \param blocking specifies whether the object should block when processing input.
1758 /// \return the number of bytes that remain to be processed (i.e., bytes not processed). 0 indicates all
1759 /// bytes were processed.
1760 /// \details Internally, PutModifiable2() calls Put2().
1761 virtual size_t PutModifiable2(byte *inString, size_t length, int messageEnd, bool blocking)
1762 {return Put2(inString, length, messageEnd, blocking);}
1763
1764 /// \brief Exception thrown by objects that have \a not implemented nonblocking input processing
1765 /// \details BlockingInputOnly inherits from NotImplemented
1766 struct BlockingInputOnly : public NotImplemented
1767 {BlockingInputOnly(const std::string &s) : NotImplemented(s + ": Nonblocking input is not implemented by this object.") {}};
1768 //@}
1769
1770 /// \name WAITING
1771 //@{
1772 /// \brief Retrieves the maximum number of waitable objects
1773 unsigned int GetMaxWaitObjectCount() const;
1774
1775 /// \brief Retrieves waitable objects
1776 /// \param container the wait container to receive the references to the objects
1777 /// \param callStack CallStack() object used to select waitable objects
1778 /// \details GetWaitObjects is usually called in one of two ways. First, it can
1779 /// be called like <tt>something.GetWaitObjects(c, CallStack("my func after X", 0));</tt>.
1780 /// Second, if in an outer GetWaitObjects() method that itself takes a callStack
1781 /// parameter, it can be called like
1782 /// <tt>innerThing.GetWaitObjects(c, CallStack("MyClass::GetWaitObjects at X", &callStack));</tt>.
1783 void GetWaitObjects(WaitObjectContainer &container, CallStack const& callStack);
1784 //@} // WAITING
1785
1786 /// \name SIGNALS
1787 //@{
1788
1789 /// \brief Initialize or reinitialize this object, without signal propagation
1790 /// \param parameters a set of NameValuePairs to initialize this object
1791 /// \throw NotImplemented
1792 /// \details IsolatedInitialize() is used to initialize or reinitialize an object using a variable
1793 /// number of arbitrarily typed arguments. The function avoids the need for multiple constructors providing
1794 /// all possible combintations of configurable parameters.
1795 /// \details IsolatedInitialize() does not call Initialize() on attached transformations. If initialization
1796 /// should be propagated, then use the Initialize() function.
1797 /// \details If a derived class does not override IsolatedInitialize(), then the base class throws
1798 /// NotImplemented.
1799 virtual void IsolatedInitialize(const NameValuePairs &parameters) {
1800 CRYPTOPP_UNUSED(parameters);
1801 throw NotImplemented("BufferedTransformation: this object can't be reinitialized");
1802 }
1803
1804 /// \brief Flushes data buffered by this object, without signal propagation
1805 /// \param hardFlush indicates whether all data should be flushed
1806 /// \param blocking specifies whether the object should block when processing input
1807 /// \return true if the flush was successful, false otherwise
1808 /// \note hardFlush must be used with care
1809 virtual bool IsolatedFlush(bool hardFlush, bool blocking) =0;
1810
1811 /// \brief Marks the end of a series of messages, without signal propagation
1812 /// \param blocking specifies whether the object should block when completing the processing on
1813 /// the current series of messages
1814 /// \return true if the message was successful, false otherwise
1815 virtual bool IsolatedMessageSeriesEnd(bool blocking)
1816 {CRYPTOPP_UNUSED(blocking); return false;}
1817
1818 /// \brief Initialize or reinitialize this object, with signal propagation
1819 /// \param parameters a set of NameValuePairs to initialize or reinitialize this object
1820 /// \param propagation the number of attached transformations the Initialize() signal should be passed
1821 /// \details Initialize() is used to initialize or reinitialize an object using a variable number of
1822 /// arbitrarily typed arguments. The function avoids the need for multiple constructors providing
1823 /// all possible combintations of configurable parameters.
1824 /// \details propagation count includes this object. Setting propagation to <tt>1</tt> means this
1825 /// object only. Setting propagation to <tt>-1</tt> means unlimited propagation.
1826 virtual void Initialize(const NameValuePairs &parameters=g_nullNameValuePairs, int propagation=-1);
1827
1828 /// \brief Flush buffered input and/or output, with signal propagation
1829 /// \param hardFlush is used to indicate whether all data should be flushed
1830 /// \param propagation the number of attached transformations the Flush()
1831 /// signal should be passed
1832 /// \param blocking specifies whether the object should block when processing input
1833 /// \return true if the flush was successful, false otherwise
1834 /// \details propagation count includes this object. Setting propagation to
1835 /// <tt>1</tt> means this object only. Setting propagation to <tt>-1</tt>
1836 /// means unlimited propagation.
1837 /// \note Hard flushes must be used with care. It means try to process and
1838 /// output everything, even if there may not be enough data to complete the
1839 /// action. For example, hard flushing a HexDecoder would cause an error if
1840 /// you do it after inputing an odd number of hex encoded characters.
1841 /// \note For some types of filters, like ZlibDecompressor, hard flushes can
1842 /// only be done at "synchronization points". These synchronization points
1843 /// are positions in the data stream that are created by hard flushes on the
1844 /// corresponding reverse filters, in this example ZlibCompressor. This is
1845 /// useful when zlib compressed data is moved across a network in packets
1846 /// and compression state is preserved across packets, as in the SSH2 protocol.
1847 virtual bool Flush(bool hardFlush, int propagation=-1, bool blocking=true);
1848
1849 /// \brief Marks the end of a series of messages, with signal propagation
1850 /// \param propagation the number of attached transformations the MessageSeriesEnd() signal should be passed
1851 /// \param blocking specifies whether the object should block when processing input
1852 /// \return true if the message was successful, false otherwise
1853 /// \details Each object that receives the signal will perform its processing, decrement
1854 /// propagation, and then pass the signal on to attached transformations if the value is not 0.
1855 /// \details propagation count includes this object. Setting propagation to <tt>1</tt> means this
1856 /// object only. Setting propagation to <tt>-1</tt> means unlimited propagation.
1857 /// \note There should be a MessageEnd() immediately before MessageSeriesEnd().
1858 virtual bool MessageSeriesEnd(int propagation=-1, bool blocking=true);
1859
1860 /// \brief Set propagation of automatically generated and transferred signals
1861 /// \param propagation then new value
1862 /// \details Setting propagation to <tt>0</tt> means do not automatically generate signals. Setting
1863 /// propagation to <tt>-1</tt> means unlimited propagation.
1864 virtual void SetAutoSignalPropagation(int propagation)
1865 {CRYPTOPP_UNUSED(propagation);}
1866
1867 /// \brief Retrieve automatic signal propagation value
1868 /// \return the number of attached transformations the signal is propagated to. 0 indicates
1869 /// the signal is only witnessed by this object
1870 virtual int GetAutoSignalPropagation() const {return 0;}
1871 public:
1872
1873 /// \name RETRIEVAL OF ONE MESSAGE
1874 //@{
1875
1876 /// \brief Provides the number of bytes ready for retrieval
1877 /// \return the number of bytes ready for retrieval
1878 /// \details The number of bytes available are dependent on the source. If an exact value is
1879 /// available, then the exact value is returned. The exact value can include 0 if the source
1880 /// is exhausted.
1881 /// \details Some stream-based sources do not allow seeking() on the underlying stream, such
1882 /// as some FileSource(). If the stream does not allow seeking() then MaxRetrievable()
1883 /// returns LWORD_MAX to indicate there are still bytes to be retrieved.
1884 virtual lword MaxRetrievable() const;
1885
1886 /// \brief Determines whether bytes are ready for retrieval
1887 /// \return true if bytes are available for retrieval, false otherwise
1888 virtual bool AnyRetrievable() const;
1889
1890 /// \brief Retrieve a 8-bit byte
1891 /// \param outByte the 8-bit value to be retrieved
1892 /// \return the number of bytes consumed during the call.
1893 /// \details Use the return value of Get to detect short reads.
1894 virtual size_t Get(byte &outByte);
1895
1896 /// \brief Retrieve a block of bytes
1897 /// \param outString a block of bytes
1898 /// \param getMax the number of bytes to Get
1899 /// \return the number of bytes consumed during the call.
1900 /// \details Use the return value of Get to detect short reads.
1901 virtual size_t Get(byte *outString, size_t getMax);
1902
1903 /// \brief Peek a 8-bit byte
1904 /// \param outByte the 8-bit value to be retrieved
1905 /// \return the number of bytes read during the call.
1906 /// \details Peek does not remove bytes from the object. Use the return value of
1907 /// Get() to detect short reads.
1908 virtual size_t Peek(byte &outByte) const;
1909
1910 /// \brief Peek a block of bytes
1911 /// \param outString a block of bytes
1912 /// \param peekMax the number of bytes to Peek
1913 /// \return the number of bytes read during the call.
1914 /// \details Peek does not remove bytes from the object. Use the return value of
1915 /// Peek() to detect short reads.
1916 virtual size_t Peek(byte *outString, size_t peekMax) const;
1917
1918 /// \brief Retrieve a 16-bit word
1919 /// \param value the 16-bit value to be retrieved
1920 /// \param order the ByteOrder of the value to be processed.
1921 /// \return the number of bytes consumed during the call.
1922 /// \details Use the return value of GetWord16() to detect short reads.
1923 size_t GetWord16(word16 &value, ByteOrder order=BIG_ENDIAN_ORDER);
1924
1925 /// \brief Retrieve a 32-bit word
1926 /// \param value the 32-bit value to be retrieved
1927 /// \param order the ByteOrder of the value to be processed.
1928 /// \return the number of bytes consumed during the call.
1929 /// \details Use the return value of GetWord32() to detect short reads.
1930 size_t GetWord32(word32 &value, ByteOrder order=BIG_ENDIAN_ORDER);
1931
1932 /// \brief Retrieve a 64-bit word
1933 /// \param value the 64-bit value to be retrieved
1934 /// \param order the ByteOrder of the value to be processed.
1935 /// \return the number of bytes consumed during the call.
1936 /// \details Use the return value of GetWord64() to detect short reads.
1937 /// \since Crypto++ 8.3
1938 size_t GetWord64(word64 &value, ByteOrder order=BIG_ENDIAN_ORDER);
1939
1940 /// \brief Peek a 16-bit word
1941 /// \param value the 16-bit value to be retrieved
1942 /// \param order the ByteOrder of the value to be processed.
1943 /// \return the number of bytes consumed during the call.
1944 /// \details Peek does not consume bytes in the stream. Use the return value
1945 /// of PeekWord16() to detect short reads.
1946 size_t PeekWord16(word16 &value, ByteOrder order=BIG_ENDIAN_ORDER) const;
1947
1948 /// \brief Peek a 32-bit word
1949 /// \param value the 32-bit value to be retrieved
1950 /// \param order the ByteOrder of the value to be processed.
1951 /// \return the number of bytes consumed during the call.
1952 /// \details Peek does not consume bytes in the stream. Use the return value
1953 /// of PeekWord32() to detect short reads.
1954 size_t PeekWord32(word32 &value, ByteOrder order=BIG_ENDIAN_ORDER) const;
1955
1956 /// \brief Peek a 64-bit word
1957 /// \param value the 64-bit value to be retrieved
1958 /// \param order the ByteOrder of the value to be processed.
1959 /// \return the number of bytes consumed during the call.
1960 /// \details Peek does not consume bytes in the stream. Use the return value
1961 /// of PeekWord64() to detect short reads.
1962 /// \since Crypto++ 8.3
1963 size_t PeekWord64(word64 &value, ByteOrder order=BIG_ENDIAN_ORDER) const;
1964
1965 /// move transferMax bytes of the buffered output to target as input
1966
1967 /// \brief Transfer bytes from this object to another BufferedTransformation
1968 /// \param target the destination BufferedTransformation
1969 /// \param transferMax the number of bytes to transfer
1970 /// \param channel the channel on which the transfer should occur
1971 /// \return the number of bytes transferred during the call.
1972 /// \details TransferTo removes bytes from this object and moves them to the destination.
1973 /// \details The function always returns transferMax. If an accurate count is needed, then use TransferTo2().
1974 lword TransferTo(BufferedTransformation &target, lword transferMax=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL)
1975 {TransferTo2(target, transferMax, channel); return transferMax;}
1976
1977 /// \brief Discard skipMax bytes from the output buffer
1978 /// \param skipMax the number of bytes to discard
1979 /// \details Skip() discards bytes from the output buffer, which is the AttachedTransformation(), if present.
1980 /// The function always returns the parameter <tt>skipMax</tt>.
1981 /// \details If you want to skip bytes from a Source, then perform the following.
1982 /// <pre> StringSource ss(str, false, new Redirector(TheBitBucket()));
1983 /// ss.Pump(10); // Skip 10 bytes from Source
1984 /// ss.Detach(new FilterChain(...));
1985 /// ss.PumpAll();
1986 /// </pre>
1987 virtual lword Skip(lword skipMax=LWORD_MAX);
1988
1989 /// \brief Copy bytes from this object to another BufferedTransformation
1990 /// \param target the destination BufferedTransformation
1991 /// \param copyMax the number of bytes to copy
1992 /// \param channel the channel on which the transfer should occur
1993 /// \return the number of bytes copied during the call.
1994 /// \details CopyTo copies bytes from this object to the destination. The bytes are not removed from this object.
1995 /// \details The function always returns copyMax. If an accurate count is needed, then use CopyRangeTo2().
1996 lword CopyTo(BufferedTransformation &target, lword copyMax=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL) const
1997 {return CopyRangeTo(target, 0, copyMax, channel);}
1998
1999 /// \brief Copy bytes from this object using an index to another BufferedTransformation
2000 /// \param target the destination BufferedTransformation
2001 /// \param position the 0-based index of the byte stream to begin the copying
2002 /// \param copyMax the number of bytes to copy
2003 /// \param channel the channel on which the transfer should occur
2004 /// \return the number of bytes copied during the call.
2005 /// \details CopyTo copies bytes from this object to the destination. The bytes remain in this
2006 /// object. Copying begins at the index position in the current stream, and not from an absolute
2007 /// position in the stream.
2008 /// \details The function returns the new position in the stream after transferring the bytes starting at the index.
2009 lword CopyRangeTo(BufferedTransformation &target, lword position, lword copyMax=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL) const
2010 {lword i = position; CopyRangeTo2(target, i, i+copyMax, channel); return i-position;}
2011 //@}
2012
2013 /// \name RETRIEVAL OF MULTIPLE MESSAGES
2014 //@{
2015
2016 /// \brief Provides the number of bytes ready for retrieval
2017 /// \return the number of bytes ready for retrieval
2018 virtual lword TotalBytesRetrievable() const;
2019
2020 /// \brief Provides the number of meesages processed by this object
2021 /// \return the number of meesages processed by this object
2022 /// \details NumberOfMessages returns number of times MessageEnd() has been
2023 /// received minus messages retrieved or skipped
2024 virtual unsigned int NumberOfMessages() const;
2025
2026 /// \brief Determines if any messages are available for retrieval
2027 /// \return true if <tt>NumberOfMessages() &gt; 0</tt>, false otherwise
2028 /// \details AnyMessages returns true if <tt>NumberOfMessages() &gt; 0</tt>
2029 virtual bool AnyMessages() const;
2030
2031 /// \brief Start retrieving the next message
2032 /// \return true if a message is ready for retrieval
2033 /// \details GetNextMessage() returns true if a message is ready for retrieval; false
2034 /// if no more messages exist or this message is not completely retrieved.
2035 virtual bool GetNextMessage();
2036
2037 /// \brief Skip a number of meessages
2038 /// \param count number of messages to skip
2039 /// \return 0 if the requested number of messages was skipped, non-0 otherwise
2040 /// \details SkipMessages() skips count number of messages. If there is an AttachedTransformation()
2041 /// then SkipMessages() is called on the attached transformation. If there is no attached
2042 /// transformation, then count number of messages are sent to TheBitBucket() using TransferMessagesTo().
2043 virtual unsigned int SkipMessages(unsigned int count=UINT_MAX);
2044
2045 /// \brief Transfer messages from this object to another BufferedTransformation
2046 /// \param target the destination BufferedTransformation
2047 /// \param count the number of messages to transfer
2048 /// \param channel the channel on which the transfer should occur
2049 /// \return the number of bytes that remain in the current transfer block (i.e., bytes not transferred)
2050 /// \details TransferMessagesTo2() removes messages from this object and moves them to the destination.
2051 /// If all bytes are not transferred for a message, then processing stops and the number of remaining
2052 /// bytes is returned. TransferMessagesTo() does not proceed to the next message.
2053 /// \details A return value of 0 indicates all messages were successfully transferred.
2054 unsigned int TransferMessagesTo(BufferedTransformation &target, unsigned int count=UINT_MAX, const std::string &channel=DEFAULT_CHANNEL)
2055 {TransferMessagesTo2(target, count, channel); return count;}
2056
2057 /// \brief Copy messages from this object to another BufferedTransformation
2058 /// \param target the destination BufferedTransformation
2059 /// \param count the number of messages to copy
2060 /// \param channel the channel on which the copy should occur
2061 /// \return the number of bytes that remain in the current transfer block (i.e., bytes not transferred)
2062 /// \details CopyMessagesTo copies messages from this object to the destination.
2063 /// If all bytes are not transferred for a message, then processing stops and the number of remaining
2064 /// bytes is returned. CopyMessagesTo() does not proceed to the next message.
2065 /// \details A return value of 0 indicates all messages were successfully copied.
2066 unsigned int CopyMessagesTo(BufferedTransformation &target, unsigned int count=UINT_MAX, const std::string &channel=DEFAULT_CHANNEL) const;
2067
2068 /// \brief Skip all messages in the series
2069 virtual void SkipAll();
2070
2071 /// \brief Transfer all bytes from this object to another BufferedTransformation
2072 /// \param target the destination BufferedTransformation
2073 /// \param channel the channel on which the transfer should occur
2074 /// \details TransferMessagesTo2() removes messages from this object and moves them to the destination.
2075 /// Internally TransferAllTo() calls TransferAllTo2().
2076 void TransferAllTo(BufferedTransformation &target, const std::string &channel=DEFAULT_CHANNEL)
2077 {TransferAllTo2(target, channel);}
2078
2079 /// \brief Copy messages from this object to another BufferedTransformation
2080 /// \param target the destination BufferedTransformation
2081 /// \param channel the channel on which the transfer should occur
2082 /// \details CopyAllTo copies messages from this object and copies them to the destination.
2083 void CopyAllTo(BufferedTransformation &target, const std::string &channel=DEFAULT_CHANNEL) const;
2084
2085 /// \brief Retrieve the next message in a series
2086 /// \return true if a message was retreved, false otherwise
2087 /// \details Internally, the base class implementation returns false.
2088 virtual bool GetNextMessageSeries() {return false;}
2089 /// \brief Provides the number of messages in a series
2090 /// \return the number of messages in this series
2091 virtual unsigned int NumberOfMessagesInThisSeries() const {return NumberOfMessages();}
2092 /// \brief Provides the number of messages in a series
2093 /// \return the number of messages in this series
2094 virtual unsigned int NumberOfMessageSeries() const {return 0;}
2095 //@}
2096
2097 /// \name NON-BLOCKING TRANSFER OF OUTPUT
2098 //@{
2099
2100 // upon return, byteCount contains number of bytes that have finished being transferred,
2101 // and returns the number of bytes left in the current transfer block
2102
2103 /// \brief Transfer bytes from this object to another BufferedTransformation
2104 /// \param target the destination BufferedTransformation
2105 /// \param byteCount the number of bytes to transfer
2106 /// \param channel the channel on which the transfer should occur
2107 /// \param blocking specifies whether the object should block when processing input
2108 /// \return the number of bytes that remain in the transfer block (i.e., bytes not transferred)
2109 /// \details TransferTo2() removes bytes from this object and moves them to the destination.
2110 /// Transfer begins at the index position in the current stream, and not from an absolute
2111 /// position in the stream.
2112 /// \details byteCount is an \a IN and \a OUT parameter. When the call is made,
2113 /// byteCount is the requested size of the transfer. When the call returns, byteCount is
2114 /// the number of bytes that were transferred.
2115 virtual size_t TransferTo2(BufferedTransformation &target, lword &byteCount, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true) =0;
2116
2117 // upon return, begin contains the start position of data yet to be finished copying,
2118 // and returns the number of bytes left in the current transfer block
2119
2120 /// \brief Copy bytes from this object to another BufferedTransformation
2121 /// \param target the destination BufferedTransformation
2122 /// \param begin the 0-based index of the first byte to copy in the stream
2123 /// \param end the 0-based index of the last byte to copy in the stream
2124 /// \param channel the channel on which the transfer should occur
2125 /// \param blocking specifies whether the object should block when processing input
2126 /// \return the number of bytes that remain in the copy block (i.e., bytes not copied)
2127 /// \details CopyRangeTo2 copies bytes from this object to the destination. The bytes are not
2128 /// removed from this object. Copying begins at the index position in the current stream, and
2129 /// not from an absolute position in the stream.
2130 /// \details begin is an \a IN and \a OUT parameter. When the call is made, begin is the
2131 /// starting position of the copy. When the call returns, begin is the position of the first
2132 /// byte that was \a not copied (which may be different than end). begin can be used for
2133 /// subsequent calls to CopyRangeTo2().
2134 virtual size_t CopyRangeTo2(BufferedTransformation &target, lword &begin, lword end=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true) const =0;
2135
2136 // upon return, messageCount contains number of messages that have finished being transferred,
2137 // and returns the number of bytes left in the current transfer block
2138
2139 /// \brief Transfer messages from this object to another BufferedTransformation
2140 /// \param target the destination BufferedTransformation
2141 /// \param messageCount the number of messages to transfer
2142 /// \param channel the channel on which the transfer should occur
2143 /// \param blocking specifies whether the object should block when processing input
2144 /// \return the number of bytes that remain in the current transfer block (i.e., bytes not transferred)
2145 /// \details TransferMessagesTo2() removes messages from this object and moves them to the destination.
2146 /// \details messageCount is an \a IN and \a OUT parameter. When the call is made, messageCount is the
2147 /// the number of messages requested to be transferred. When the call returns, messageCount is the
2148 /// number of messages actually transferred.
2149 size_t TransferMessagesTo2(BufferedTransformation &target, unsigned int &messageCount, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true);
2150
2151 // returns the number of bytes left in the current transfer block
2152
2153 /// \brief Transfer all bytes from this object to another BufferedTransformation
2154 /// \param target the destination BufferedTransformation
2155 /// \param channel the channel on which the transfer should occur
2156 /// \param blocking specifies whether the object should block when processing input
2157 /// \return the number of bytes that remain in the current transfer block (i.e., bytes not transferred)
2158 /// \details TransferMessagesTo2() removes messages from this object and moves them to the destination.
2159 size_t TransferAllTo2(BufferedTransformation &target, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true);
2160 //@}
2161
2162 /// \name CHANNELS
2163 //@{
2164 /// \brief Exception thrown when a filter does not support named channels
2165 struct NoChannelSupport : public NotImplemented
2166 {NoChannelSupport(const std::string &name) : NotImplemented(name + ": this object doesn't support multiple channels") {}};
2167 /// \brief Exception thrown when a filter does not recognize a named channel
2168 struct InvalidChannelName : public InvalidArgument
2169 {InvalidChannelName(const std::string &name, const std::string &channel) : InvalidArgument(name + ": unexpected channel name \"" + channel + "\"") {}};
2170
2171 /// \brief Input a byte for processing on a channel
2172 /// \param channel the channel to process the data.
2173 /// \param inByte the 8-bit byte (octet) to be processed.
2174 /// \param blocking specifies whether the object should block when processing input.
2175 /// \return 0 indicates all bytes were processed during the call. Non-0 indicates the
2176 /// number of bytes that were not processed.
2177 size_t ChannelPut(const std::string &channel, byte inByte, bool blocking=true)
2178 {return ChannelPut(channel, &inByte, 1, blocking);}
2179
2180 /// \brief Input a byte buffer for processing on a channel
2181 /// \param channel the channel to process the data
2182 /// \param inString the byte buffer to process
2183 /// \param length the size of the string, in bytes
2184 /// \param blocking specifies whether the object should block when processing input
2185 /// \return 0 indicates all bytes were processed during the call. Non-0 indicates the
2186 /// number of bytes that were not processed.
2187 size_t ChannelPut(const std::string &channel, const byte *inString, size_t length, bool blocking=true)
2188 {return ChannelPut2(channel, inString, length, 0, blocking);}
2189
2190 /// \brief Input multiple bytes that may be modified by callee on a channel
2191 /// \param channel the channel to process the data.
2192 /// \param inString the byte buffer to process
2193 /// \param length the size of the string, in bytes
2194 /// \param blocking specifies whether the object should block when processing input
2195 /// \return 0 indicates all bytes were processed during the call. Non-0 indicates the
2196 /// number of bytes that were not processed.
2197 size_t ChannelPutModifiable(const std::string &channel, byte *inString, size_t length, bool blocking=true)
2198 {return ChannelPutModifiable2(channel, inString, length, 0, blocking);}
2199
2200 /// \brief Input a 16-bit word for processing on a channel.
2201 /// \param channel the channel to process the data.
2202 /// \param value the 16-bit value to be processed.
2203 /// \param order the ByteOrder of the value to be processed.
2204 /// \param blocking specifies whether the object should block when processing input.
2205 /// \return 0 indicates all bytes were processed during the call. Non-0 indicates the
2206 /// number of bytes that were not processed.
2207 size_t ChannelPutWord16(const std::string &channel, word16 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true);
2208
2209 /// \brief Input a 32-bit word for processing on a channel.
2210 /// \param channel the channel to process the data.
2211 /// \param value the 32-bit value to be processed.
2212 /// \param order the ByteOrder of the value to be processed.
2213 /// \param blocking specifies whether the object should block when processing input.
2214 /// \return 0 indicates all bytes were processed during the call. Non-0 indicates the
2215 /// number of bytes that were not processed.
2216 size_t ChannelPutWord32(const std::string &channel, word32 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true);
2217
2218 /// \brief Input a 64-bit word for processing on a channel.
2219 /// \param channel the channel to process the data.
2220 /// \param value the 64-bit value to be processed.
2221 /// \param order the ByteOrder of the value to be processed.
2222 /// \param blocking specifies whether the object should block when processing input.
2223 /// \return 0 indicates all bytes were processed during the call. Non-0 indicates the
2224 /// number of bytes that were not processed.
2225 size_t ChannelPutWord64(const std::string &channel, word64 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true);
2226
2227 /// \brief Signal the end of a message
2228 /// \param channel the channel to process the data.
2229 /// \param propagation the number of attached transformations the ChannelMessageEnd() signal should be passed
2230 /// \param blocking specifies whether the object should block when processing input
2231 /// \return 0 indicates all bytes were processed during the call. Non-0 indicates the
2232 /// number of bytes that were not processed.
2233 /// \details propagation count includes this object. Setting propagation to <tt>1</tt> means this
2234 /// object only. Setting propagation to <tt>-1</tt> means unlimited propagation.
2235 bool ChannelMessageEnd(const std::string &channel, int propagation=-1, bool blocking=true)
2236 {return !!ChannelPut2(channel, NULLPTR, 0, propagation < 0 ? -1 : propagation+1, blocking);}
2237
2238 /// \brief Input multiple bytes for processing and signal the end of a message
2239 /// \param channel the channel to process the data.
2240 /// \param inString the byte buffer to process
2241 /// \param length the size of the string, in bytes
2242 /// \param propagation the number of attached transformations the ChannelPutMessageEnd() signal should be passed
2243 /// \param blocking specifies whether the object should block when processing input
2244 /// \return the number of bytes that remain to be processed (i.e., bytes not processed)
2245 /// \details propagation count includes this object. Setting propagation to <tt>1</tt> means this
2246 /// object only. Setting propagation to <tt>-1</tt> means unlimited propagation.
2247 size_t ChannelPutMessageEnd(const std::string &channel, const byte *inString, size_t length, int propagation=-1, bool blocking=true)
2248 {return ChannelPut2(channel, inString, length, propagation < 0 ? -1 : propagation+1, blocking);}
2249
2250 /// \brief Request space which can be written into by the caller
2251 /// \param channel the channel to process the data
2252 /// \param size the requested size of the buffer
2253 /// \return a pointer to a memory block with length size
2254 /// \details The purpose of this method is to help avoid extra memory allocations.
2255 /// \details size is an \a IN and \a OUT parameter and used as a hint. When the call is made,
2256 /// size is the requested size of the buffer. When the call returns, size is the size of
2257 /// the array returned to the caller.
2258 /// \details The base class implementation sets size to 0 and returns NULL.
2259 /// \note Some objects, like ArraySink(), cannot create a space because its fixed. In the case of
2260 /// an ArraySink(), the pointer to the array is returned and the size is remaining size.
2261 virtual byte * ChannelCreatePutSpace(const std::string &channel, size_t &size);
2262
2263 /// \brief Input multiple bytes for processing on a channel.
2264 /// \param channel the channel to process the data.
2265 /// \param inString the byte buffer to process.
2266 /// \param length the size of the string, in bytes.
2267 /// \param messageEnd means how many filters to signal MessageEnd() to, including this one.
2268 /// \param blocking specifies whether the object should block when processing input.
2269 /// \return the number of bytes that remain to be processed (i.e., bytes not processed)
2270 virtual size_t ChannelPut2(const std::string &channel, const byte *inString, size_t length, int messageEnd, bool blocking);
2271
2272 /// \brief Input multiple bytes that may be modified by callee on a channel
2273 /// \param channel the channel to process the data
2274 /// \param inString the byte buffer to process
2275 /// \param length the size of the string, in bytes
2276 /// \param messageEnd means how many filters to signal MessageEnd() to, including this one
2277 /// \param blocking specifies whether the object should block when processing input
2278 /// \return the number of bytes that remain to be processed (i.e., bytes not processed)
2279 virtual size_t ChannelPutModifiable2(const std::string &channel, byte *inString, size_t length, int messageEnd, bool blocking);
2280
2281 /// \brief Flush buffered input and/or output on a channel
2282 /// \param channel the channel to flush the data
2283 /// \param hardFlush is used to indicate whether all data should be flushed
2284 /// \param propagation the number of attached transformations the ChannelFlush() signal should be passed
2285 /// \param blocking specifies whether the object should block when processing input
2286 /// \return true of the Flush was successful
2287 /// \details propagation count includes this object. Setting propagation to <tt>1</tt> means this
2288 /// object only. Setting propagation to <tt>-1</tt> means unlimited propagation.
2289 virtual bool ChannelFlush(const std::string &channel, bool hardFlush, int propagation=-1, bool blocking=true);
2290
2291 /// \brief Marks the end of a series of messages on a channel
2292 /// \param channel the channel to signal the end of a series of messages
2293 /// \param propagation the number of attached transformations the ChannelMessageSeriesEnd() signal should be passed
2294 /// \param blocking specifies whether the object should block when processing input
2295 /// \return true if the message was successful, false otherwise
2296 /// \details Each object that receives the signal will perform its processing, decrement
2297 /// propagation, and then pass the signal on to attached transformations if the value is not 0.
2298 /// \details propagation count includes this object. Setting propagation to <tt>1</tt> means this
2299 /// object only. Setting propagation to <tt>-1</tt> means unlimited propagation.
2300 /// \note There should be a MessageEnd() immediately before MessageSeriesEnd().
2301 virtual bool ChannelMessageSeriesEnd(const std::string &channel, int propagation=-1, bool blocking=true);
2302
2303 /// \brief Sets the default retrieval channel
2304 /// \param channel the channel to signal the end of a series of messages
2305 /// \note this function may not be implemented in all objects that should support it.
2306 virtual void SetRetrievalChannel(const std::string &channel);
2307 //@}
2308
2309 /// \name ATTACHMENT
2310 /// \details Some BufferedTransformation objects (e.g. Filter objects) allow other BufferedTransformation objects to be
2311 /// attached. When this is done, the first object instead of buffering its output, sends that output to the attached
2312 /// object as input. The entire attachment chain is deleted when the anchor object is destructed.
2313
2314 //@{
2315 /// \brief Determines whether the object allows attachment
2316 /// \return true if the object allows an attachment, false otherwise
2317 /// \details Sources and Filters will returns true, while Sinks and other objects will return false.
2318 virtual bool Attachable() {return false;}
2319
2320 /// \brief Returns the object immediately attached to this object
2321 /// \return the attached transformation
2322 /// \details AttachedTransformation() returns NULL if there is no attachment. The non-const
2323 /// version of AttachedTransformation() always returns NULL.
2324 virtual BufferedTransformation *AttachedTransformation() {CRYPTOPP_ASSERT(!Attachable()); return NULLPTR;}
2325
2326 /// \brief Returns the object immediately attached to this object
2327 /// \return the attached transformation
2328 /// \details AttachedTransformation() returns NULL if there is no attachment. The non-const
2329 /// version of AttachedTransformation() always returns NULL.
2330 virtual const BufferedTransformation *AttachedTransformation() const
2331 {return const_cast<BufferedTransformation *>(this)->AttachedTransformation();}
2332
2333 /// \brief Delete the current attachment chain and attach a new one
2334 /// \param newAttachment the new BufferedTransformation to attach
2335 /// \throw NotImplemented
2336 /// \details Detach() deletes the current attachment chain and replace it with an optional newAttachment
2337 /// \details If a derived class does not override Detach(), then the base class throws
2338 /// NotImplemented.
2339 virtual void Detach(BufferedTransformation *newAttachment = NULLPTR) {
2340 CRYPTOPP_UNUSED(newAttachment); CRYPTOPP_ASSERT(!Attachable());
2341 throw NotImplemented("BufferedTransformation: this object is not attachable");
2342 }
2343
2344 /// \brief Add newAttachment to the end of attachment chain
2345 /// \param newAttachment the attachment to add to the end of the chain
2346 virtual void Attach(BufferedTransformation *newAttachment);
2347 //@}
2348
2349 protected:
2350 /// \brief Decrements the propagation count while clamping at 0
2351 /// \return the decremented propagation or 0
2352 static int DecrementPropagation(int propagation)
2353 {return propagation != 0 ? propagation - 1 : 0;}
2354
2355 private:
2356 // for ChannelPutWord16, ChannelPutWord32 and ChannelPutWord64,
2357 // to ensure the buffer isn't deallocated before non-blocking
2358 // operation completes
2359 byte m_buf[8];
2360 };
2361
2362 /// \brief An input discarding BufferedTransformation
2363 /// \return a reference to a BufferedTransformation object that discards all input
2364 CRYPTOPP_DLL BufferedTransformation & TheBitBucket();
2365
2366 /// \brief Interface for crypto material
2367 /// \details CryptoMaterial() is an interface for crypto material, such as
2368 /// public keys, private keys and crypto parameters. Derived classes generally
2369 /// do not offer public methods such as GenerateRandom() and
2370 /// GenerateRandomWithKeySize().
2371 /// \sa GeneratableCryptoMaterial()
2372 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CryptoMaterial : public NameValuePairs
2373 {
2374 public:
2375 /// Exception thrown when invalid crypto material is detected
2376 class CRYPTOPP_DLL InvalidMaterial : public InvalidDataFormat
2377 {
2378 public:
2379 explicit InvalidMaterial(const std::string &s) : InvalidDataFormat(s) {}
2380 };
2381
2382 virtual ~CryptoMaterial() {}
2383
2384 /// \brief Assign values to this object
2385 /// \details This function can be used to create a public key from a private key.
2386 virtual void AssignFrom(const NameValuePairs &source) =0;
2387
2388 /// \brief Check this object for errors
2389 /// \param rng a RandomNumberGenerator for objects which use randomized testing
2390 /// \param level the level of thoroughness
2391 /// \return true if the tests succeed, false otherwise
2392 /// \details There are four levels of thoroughness:
2393 /// <ul>
2394 /// <li>0 - using this object won't cause a crash or exception
2395 /// <li>1 - this object will probably function, and encrypt, sign, other operations correctly
2396 /// <li>2 - ensure this object will function correctly, and perform reasonable security checks
2397 /// <li>3 - perform reasonable security checks, and do checks that may take a long time
2398 /// </ul>
2399 /// \details Level 0 does not require a RandomNumberGenerator. A NullRNG() can be used for level 0.
2400 /// Level 1 may not check for weak keys and such. Levels 2 and 3 are recommended.
2401 /// \sa ThrowIfInvalid()
2402 virtual bool Validate(RandomNumberGenerator &rng, unsigned int level) const =0;
2403
2404 /// \brief Check this object for errors
2405 /// \param rng a RandomNumberGenerator for objects which use randomized testing
2406 /// \param level the level of thoroughness
2407 /// \throw InvalidMaterial
2408 /// \details Internally, ThrowIfInvalid() calls Validate() and throws InvalidMaterial() if validation fails.
2409 /// \sa Validate()
2410 virtual void ThrowIfInvalid(RandomNumberGenerator &rng, unsigned int level) const
2411 {if (!Validate(rng, level)) throw InvalidMaterial("CryptoMaterial: this object contains invalid values");}
2412
2413 /// \brief Saves a key to a BufferedTransformation
2414 /// \param bt the destination BufferedTransformation
2415 /// \throw NotImplemented
2416 /// \details Save() writes the material to a BufferedTransformation.
2417 /// \details If the material is a key, then the key is written with ASN.1 DER encoding. The key
2418 /// includes an object identifier with an algorthm id, like a subjectPublicKeyInfo.
2419 /// \details A "raw" key without the "key info" can be saved using a key's DEREncode() method.
2420 /// \details If a derived class does not override Save(), then the base class throws
2421 /// NotImplemented().
2422 virtual void Save(BufferedTransformation &bt) const
2423 {CRYPTOPP_UNUSED(bt); throw NotImplemented("CryptoMaterial: this object does not support saving");}
2424
2425 /// \brief Loads a key from a BufferedTransformation
2426 /// \param bt the source BufferedTransformation
2427 /// \throw KeyingErr
2428 /// \details Load() attempts to read material from a BufferedTransformation. If the
2429 /// material is a key that was generated outside the library, then the following
2430 /// usually applies:
2431 /// <ul>
2432 /// <li>the key should be ASN.1 BER encoded
2433 /// <li>the key should be a "key info"
2434 /// </ul>
2435 /// \details "key info" means the key should have an object identifier with an algorthm id,
2436 /// like a subjectPublicKeyInfo.
2437 /// \details To read a "raw" key without the "key info", then call the key's BERDecode() method.
2438 /// \note Load() generally does not check that the key is valid. Call Validate(), if needed.
2439 virtual void Load(BufferedTransformation &bt)
2440 {CRYPTOPP_UNUSED(bt); throw NotImplemented("CryptoMaterial: this object does not support loading");}
2441
2442 /// \brief Determines whether the object supports precomputation
2443 /// \return true if the object supports precomputation, false otherwise
2444 /// \sa Precompute()
2445 virtual bool SupportsPrecomputation() const {return false;}
2446
2447 /// \brief Perform precomputation
2448 /// \param precomputationStorage the suggested number of objects for the precompute table
2449 /// \throw NotImplemented
2450 /// \details The exact semantics of Precompute() varies, but it typically means calculate
2451 /// a table of n objects that can be used later to speed up computation.
2452 /// \details If a derived class does not override Precompute(), then the base class throws
2453 /// NotImplemented.
2454 /// \sa SupportsPrecomputation(), LoadPrecomputation(), SavePrecomputation()
2455 virtual void Precompute(unsigned int precomputationStorage) {
2456 CRYPTOPP_UNUSED(precomputationStorage); CRYPTOPP_ASSERT(!SupportsPrecomputation());
2457 throw NotImplemented("CryptoMaterial: this object does not support precomputation");
2458 }
2459
2460 /// \brief Retrieve previously saved precomputation
2461 /// \param storedPrecomputation BufferedTransformation with the saved precomputation
2462 /// \throw NotImplemented
2463 /// \sa SupportsPrecomputation(), Precompute()
2464 virtual void LoadPrecomputation(BufferedTransformation &storedPrecomputation)
2465 {CRYPTOPP_UNUSED(storedPrecomputation); CRYPTOPP_ASSERT(!SupportsPrecomputation()); throw NotImplemented("CryptoMaterial: this object does not support precomputation");}
2466
2467 /// \brief Save precomputation for later use
2468 /// \param storedPrecomputation BufferedTransformation to write the precomputation
2469 /// \throw NotImplemented
2470 /// \sa SupportsPrecomputation(), Precompute()
2471 virtual void SavePrecomputation(BufferedTransformation &storedPrecomputation) const
2472 {CRYPTOPP_UNUSED(storedPrecomputation); CRYPTOPP_ASSERT(!SupportsPrecomputation()); throw NotImplemented("CryptoMaterial: this object does not support precomputation");}
2473
2474 /// \brief Perform a quick sanity check
2475 /// \details DoQuickSanityCheck() is for internal library use, and it should not be called by library users.
2476 void DoQuickSanityCheck() const {ThrowIfInvalid(NullRNG(), 0);}
2477
2478 #if defined(__SUNPRO_CC)
2479 // Sun Studio 11/CC 5.8 workaround: it generates incorrect code
2480 // when casting to an empty virtual base class. JW, 2018: It is
2481 // still a problem in Sun Studio 12.6/CC 5.15 on i386. Just enable
2482 // it everywhere in case it affects SPARC (which we don't test).
2483 char m_sunCCworkaround;
2484 #endif
2485 };
2486
2487 /// \brief Interface for crypto material
2488 /// \details GeneratableCryptoMaterial() is an interface for crypto material,
2489 /// such as private keys and crypto parameters. Derived classes offer public
2490 /// methods such as GenerateRandom() and GenerateRandomWithKeySize().
2491 /// \sa CryptoMaterial()
2492 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE GeneratableCryptoMaterial : virtual public CryptoMaterial
2493 {
2494 public:
2495 virtual ~GeneratableCryptoMaterial() {}
2496
2497 /// \brief Generate a random key or crypto parameters
2498 /// \param rng a RandomNumberGenerator to produce keying material
2499 /// \param params additional initialization parameters
2500 /// \throw KeyingErr if a key can't be generated or algorithm parameters are invalid
2501 /// \details If a derived class does not override GenerateRandom(), then the base class throws
2502 /// NotImplemented.
2503 virtual void GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs &params = g_nullNameValuePairs) {
2504 CRYPTOPP_UNUSED(rng); CRYPTOPP_UNUSED(params);
2505 throw NotImplemented("GeneratableCryptoMaterial: this object does not support key/parameter generation");
2506 }
2507
2508 /// \brief Generate a random key or crypto parameters
2509 /// \param rng a RandomNumberGenerator to produce keying material
2510 /// \param keySize the size of the key, in bits
2511 /// \throw KeyingErr if a key can't be generated or algorithm parameters are invalid
2512 /// \details GenerateRandomWithKeySize calls GenerateRandom() with a NameValuePairs
2513 /// object with only "KeySize"
2514 void GenerateRandomWithKeySize(RandomNumberGenerator &rng, unsigned int keySize);
2515 };
2516
2517 /// \brief Interface for public keys
2518 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PublicKey : virtual public CryptoMaterial
2519 {
2520 };
2521
2522 /// \brief Interface for private keys
2523 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PrivateKey : public GeneratableCryptoMaterial
2524 {
2525 };
2526
2527 /// \brief Interface for crypto prameters
2528 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CryptoParameters : public GeneratableCryptoMaterial
2529 {
2530 };
2531
2532 /// \brief Interface for certificates
2533 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE Certificate : virtual public CryptoMaterial
2534 {
2535 };
2536
2537 /// \brief Interface for asymmetric algorithms
2538 /// \details BERDecode() and DEREncode() were removed under Issue 569
2539 /// and Commit 9b174e84de7a. Programs should use <tt>AccessMaterial().Load(bt)</tt>
2540 /// or <tt>GetMaterial().Save(bt)</tt> instead.
2541 /// \sa <A HREF="https://github.com/weidai11/cryptopp/issues/569">Issue 569</A>
2542 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE AsymmetricAlgorithm : public Algorithm
2543 {
2544 public:
2545 virtual ~AsymmetricAlgorithm() {}
2546
2547 /// \brief Retrieves a reference to CryptoMaterial
2548 /// \return a reference to the crypto material
2549 virtual CryptoMaterial & AccessMaterial() =0;
2550
2551 /// \brief Retrieves a reference to CryptoMaterial
2552 /// \return a const reference to the crypto material
2553 virtual const CryptoMaterial & GetMaterial() const =0;
2554
2555 #if 0
2556 /// \brief Loads this object from a BufferedTransformation
2557 /// \param bt a BufferedTransformation object
2558 /// \details Use of BERDecode() changed to Load() at Issue 569.
2559 /// \deprecated for backwards compatibility, calls <tt>AccessMaterial().Load(bt)</tt>
2560 void BERDecode(BufferedTransformation &bt)
2561 {AccessMaterial().Load(bt);}
2562
2563 /// \brief Saves this object to a BufferedTransformation
2564 /// \param bt a BufferedTransformation object
2565 /// \details Use of DEREncode() changed to Save() at Issue 569.
2566 /// \deprecated for backwards compatibility, calls GetMaterial().Save(bt)
2567 void DEREncode(BufferedTransformation &bt) const
2568 {GetMaterial().Save(bt);}
2569 #endif
2570 };
2571
2572 /// \brief Interface for asymmetric algorithms using public keys
2573 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PublicKeyAlgorithm : public AsymmetricAlgorithm
2574 {
2575 public:
2576 virtual ~PublicKeyAlgorithm() {}
2577
2578 // VC60 workaround: no co-variant return type
2579
2580 /// \brief Retrieves a reference to a Public Key
2581 /// \return a reference to the public key
2582 CryptoMaterial & AccessMaterial()
2583 {return AccessPublicKey();}
2584 /// \brief Retrieves a reference to a Public Key
2585 /// \return a const reference the public key
2586 const CryptoMaterial & GetMaterial() const
2587 {return GetPublicKey();}
2588
2589 /// \brief Retrieves a reference to a Public Key
2590 /// \return a reference to the public key
2591 virtual PublicKey & AccessPublicKey() =0;
2592 /// \brief Retrieves a reference to a Public Key
2593 /// \return a const reference the public key
2594 virtual const PublicKey & GetPublicKey() const
2595 {return const_cast<PublicKeyAlgorithm *>(this)->AccessPublicKey();}
2596 };
2597
2598 /// \brief Interface for asymmetric algorithms using private keys
2599 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PrivateKeyAlgorithm : public AsymmetricAlgorithm
2600 {
2601 public:
2602 virtual ~PrivateKeyAlgorithm() {}
2603
2604 /// \brief Retrieves a reference to a Private Key
2605 /// \return a reference the private key
2606 CryptoMaterial & AccessMaterial() {return AccessPrivateKey();}
2607 /// \brief Retrieves a reference to a Private Key
2608 /// \return a const reference the private key
2609 const CryptoMaterial & GetMaterial() const {return GetPrivateKey();}
2610
2611 /// \brief Retrieves a reference to a Private Key
2612 /// \return a reference the private key
2613 virtual PrivateKey & AccessPrivateKey() =0;
2614 /// \brief Retrieves a reference to a Private Key
2615 /// \return a const reference the private key
2616 virtual const PrivateKey & GetPrivateKey() const {return const_cast<PrivateKeyAlgorithm *>(this)->AccessPrivateKey();}
2617 };
2618
2619 /// \brief Interface for key agreement algorithms
2620 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE KeyAgreementAlgorithm : public AsymmetricAlgorithm
2621 {
2622 public:
2623 virtual ~KeyAgreementAlgorithm() {}
2624
2625 /// \brief Retrieves a reference to Crypto Parameters
2626 /// \return a reference the crypto parameters
2627 CryptoMaterial & AccessMaterial() {return AccessCryptoParameters();}
2628 /// \brief Retrieves a reference to Crypto Parameters
2629 /// \return a const reference the crypto parameters
2630 const CryptoMaterial & GetMaterial() const {return GetCryptoParameters();}
2631
2632 /// \brief Retrieves a reference to Crypto Parameters
2633 /// \return a reference the crypto parameters
2634 virtual CryptoParameters & AccessCryptoParameters() =0;
2635 /// \brief Retrieves a reference to Crypto Parameters
2636 /// \return a const reference the crypto parameters
2637 virtual const CryptoParameters & GetCryptoParameters() const {return const_cast<KeyAgreementAlgorithm *>(this)->AccessCryptoParameters();}
2638 };
2639
2640 /// \brief Interface for public-key encryptors and decryptors
2641 /// \details This class provides an interface common to encryptors and decryptors
2642 /// for querying their plaintext and ciphertext lengths.
2643 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_CryptoSystem
2644 {
2645 public:
2646 virtual ~PK_CryptoSystem() {}
2647
2648 /// \brief Provides the maximum length of plaintext for a given ciphertext length
2649 /// \return the maximum size of the plaintext, in bytes
2650 /// \details This function returns 0 if ciphertextLength is not valid (too long or too short).
2651 virtual size_t MaxPlaintextLength(size_t ciphertextLength) const =0;
2652
2653 /// \brief Calculate the length of ciphertext given length of plaintext
2654 /// \return the maximum size of the ciphertext, in bytes
2655 /// \details This function returns 0 if plaintextLength is not valid (too long).
2656 virtual size_t CiphertextLength(size_t plaintextLength) const =0;
2657
2658 /// \brief Determines whether this object supports the use of a named parameter
2659 /// \param name the name of the parameter
2660 /// \return true if the parameter name is supported, false otherwise
2661 /// \details Some possible parameter names: EncodingParameters(), KeyDerivationParameters()
2662 /// and others Parameters listed in argnames.h
2663 virtual bool ParameterSupported(const char *name) const =0;
2664
2665 /// \brief Provides the fixed ciphertext length, if one exists
2666 /// \return the fixed ciphertext length if one exists, otherwise 0
2667 /// \details "Fixed" here means length of ciphertext does not depend on length of plaintext.
2668 /// In this case, it usually does depend on the key length.
2669 virtual size_t FixedCiphertextLength() const {return 0;}
2670
2671 /// \brief Provides the maximum plaintext length given a fixed ciphertext length
2672 /// \return maximum plaintext length given the fixed ciphertext length, if one exists,
2673 /// otherwise return 0.
2674 /// \details FixedMaxPlaintextLength(0 returns the maximum plaintext length given the fixed ciphertext
2675 /// length, if one exists, otherwise return 0.
2676 virtual size_t FixedMaxPlaintextLength() const {return 0;}
2677 };
2678
2679 /// \brief Interface for public-key encryptors
2680 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_Encryptor : public PK_CryptoSystem, public PublicKeyAlgorithm
2681 {
2682 public:
2683 /// \brief Exception thrown when trying to encrypt plaintext of invalid length
2684 class CRYPTOPP_DLL InvalidPlaintextLength : public Exception
2685 {
2686 public:
2687 InvalidPlaintextLength() : Exception(OTHER_ERROR, "PK_Encryptor: invalid plaintext length") {}
2688 };
2689
2690 /// \brief Encrypt a byte string
2691 /// \param rng a RandomNumberGenerator derived class
2692 /// \param plaintext the plaintext byte buffer
2693 /// \param plaintextLength the size of the plaintext byte buffer
2694 /// \param ciphertext a byte buffer to hold the encrypted string
2695 /// \param parameters a set of NameValuePairs to initialize this object
2696 /// \pre <tt>CiphertextLength(plaintextLength) != 0</tt> ensures the plaintext isn't too large
2697 /// \pre <tt>COUNTOF(ciphertext) == CiphertextLength(plaintextLength)</tt> ensures the output
2698 /// byte buffer is large enough.
2699 /// \sa PK_Decryptor
2700 virtual void Encrypt(RandomNumberGenerator &rng,
2701 const byte *plaintext, size_t plaintextLength,
2702 byte *ciphertext, const NameValuePairs &parameters = g_nullNameValuePairs) const =0;
2703
2704 /// \brief Create a new encryption filter
2705 /// \param rng a RandomNumberGenerator derived class
2706 /// \param attachment an attached transformation
2707 /// \param parameters a set of NameValuePairs to initialize this object
2708 /// \details \p attachment can be \p NULL. The caller is responsible for deleting the returned pointer.
2709 /// Encoding parameters should be passed in the "EP" channel.
2710 virtual BufferedTransformation * CreateEncryptionFilter(RandomNumberGenerator &rng,
2711 BufferedTransformation *attachment=NULLPTR, const NameValuePairs &parameters = g_nullNameValuePairs) const;
2712 };
2713
2714 /// \brief Interface for public-key decryptors
2715 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_Decryptor : public PK_CryptoSystem, public PrivateKeyAlgorithm
2716 {
2717 public:
2718 virtual ~PK_Decryptor() {}
2719
2720 /// \brief Decrypt a byte string
2721 /// \param rng a RandomNumberGenerator derived class
2722 /// \param ciphertext the encrypted byte buffer
2723 /// \param ciphertextLength the size of the encrypted byte buffer
2724 /// \param plaintext a byte buffer to hold the decrypted string
2725 /// \param parameters a set of NameValuePairs to initialize this object
2726 /// \return the result of the decryption operation
2727 /// \details If DecodingResult::isValidCoding is true, then DecodingResult::messageLength
2728 /// is valid and holds the actual length of the plaintext recovered. The result is undefined
2729 /// if decryption failed. If DecodingResult::isValidCoding is false, then DecodingResult::messageLength
2730 /// is undefined.
2731 /// \pre <tt>COUNTOF(plaintext) == MaxPlaintextLength(ciphertextLength)</tt> ensures the output
2732 /// byte buffer is large enough
2733 /// \sa PK_Encryptor
2734 virtual DecodingResult Decrypt(RandomNumberGenerator &rng,
2735 const byte *ciphertext, size_t ciphertextLength,
2736 byte *plaintext, const NameValuePairs &parameters = g_nullNameValuePairs) const =0;
2737
2738 /// \brief Create a new decryption filter
2739 /// \param rng a RandomNumberGenerator derived class
2740 /// \param attachment an attached transformation
2741 /// \param parameters a set of NameValuePairs to initialize this object
2742 /// \return the newly created decryption filter
2743 /// \note the caller is responsible for deleting the returned pointer
2744 virtual BufferedTransformation * CreateDecryptionFilter(RandomNumberGenerator &rng,
2745 BufferedTransformation *attachment=NULLPTR, const NameValuePairs &parameters = g_nullNameValuePairs) const;
2746
2747 /// \brief Decrypt a fixed size ciphertext
2748 /// \param rng a RandomNumberGenerator derived class
2749 /// \param ciphertext the encrypted byte buffer
2750 /// \param plaintext a byte buffer to hold the decrypted string
2751 /// \param parameters a set of NameValuePairs to initialize this object
2752 /// \return the result of the decryption operation
2753 /// \details If DecodingResult::isValidCoding is true, then DecodingResult::messageLength
2754 /// is valid and holds the actual length of the plaintext recovered. The result is undefined
2755 /// if decryption failed. If DecodingResult::isValidCoding is false, then DecodingResult::messageLength
2756 /// is undefined.
2757 /// \pre <tt>COUNTOF(plaintext) == MaxPlaintextLength(ciphertextLength)</tt> ensures the output
2758 /// byte buffer is large enough
2759 /// \sa PK_Encryptor
2760 DecodingResult FixedLengthDecrypt(RandomNumberGenerator &rng, const byte *ciphertext, byte *plaintext, const NameValuePairs &parameters = g_nullNameValuePairs) const
2761 {return Decrypt(rng, ciphertext, FixedCiphertextLength(), plaintext, parameters);}
2762 };
2763
2764 /// \brief Interface for public-key signers and verifiers
2765 /// \details This class provides an interface common to signers and verifiers for querying scheme properties
2766 /// \sa DL_SignatureSchemeBase, TF_SignatureSchemeBase, DL_SignerBase, TF_SignerBase
2767 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_SignatureScheme
2768 {
2769 public:
2770 /// \brief Exception throw when the private or public key has a length that can't be used
2771 /// \details InvalidKeyLength() may be thrown by any function in this class if the private
2772 /// or public key has a length that can't be used
2773 class CRYPTOPP_DLL InvalidKeyLength : public Exception
2774 {
2775 public:
2776 InvalidKeyLength(const std::string &message) : Exception(OTHER_ERROR, message) {}
2777 };
2778
2779 /// \brief Exception throw when the private or public key is too short to sign or verify
2780 /// \details KeyTooShort() may be thrown by any function in this class if the private or public
2781 /// key is too short to sign or verify anything
2782 class CRYPTOPP_DLL KeyTooShort : public InvalidKeyLength
2783 {
2784 public:
2785 KeyTooShort() : InvalidKeyLength("PK_Signer: key too short for this signature scheme") {}
2786 };
2787
2788 virtual ~PK_SignatureScheme() {}
2789
2790 /// \brief Provides the signature length if it only depends on the key
2791 /// \return the signature length if it only depends on the key, in bytes
2792 /// \details SignatureLength() returns the signature length if it only depends on the key, otherwise 0.
2793 virtual size_t SignatureLength() const =0;
2794
2795 /// \brief Provides the maximum signature length produced given the length of the recoverable message part
2796 /// \param recoverablePartLength the length of the recoverable message part, in bytes
2797 /// \return the maximum signature length produced for a given length of recoverable message part, in bytes
2798 /// \details MaxSignatureLength() returns the maximum signature length produced given the length of the
2799 /// recoverable message part.
2800 virtual size_t MaxSignatureLength(size_t recoverablePartLength = 0) const
2801 {CRYPTOPP_UNUSED(recoverablePartLength); return SignatureLength();}
2802
2803 /// \brief Provides the length of longest message that can be recovered
2804 /// \return the length of longest message that can be recovered, in bytes
2805 /// \details MaxRecoverableLength() returns the length of longest message that can be recovered, or 0 if
2806 /// this signature scheme does not support message recovery.
2807 virtual size_t MaxRecoverableLength() const =0;
2808
2809 /// \brief Provides the length of longest message that can be recovered from a signature of given length
2810 /// \param signatureLength the length of the signature, in bytes
2811 /// \return the length of longest message that can be recovered from a signature of given length, in bytes
2812 /// \details MaxRecoverableLengthFromSignatureLength() returns the length of longest message that can be
2813 /// recovered from a signature of given length, or 0 if this signature scheme does not support message
2814 /// recovery.
2815 virtual size_t MaxRecoverableLengthFromSignatureLength(size_t signatureLength) const =0;
2816
2817 /// \brief Determines whether a signature scheme requires a random number generator
2818 /// \return true if the signature scheme requires a RandomNumberGenerator() to sign
2819 /// \details if IsProbabilistic() returns false, then NullRNG() can be passed to functions that take
2820 /// RandomNumberGenerator().
2821 virtual bool IsProbabilistic() const =0;
2822
2823 /// \brief Determines whether the non-recoverable message part can be signed
2824 /// \return true if the non-recoverable message part can be signed
2825 virtual bool AllowNonrecoverablePart() const =0;
2826
2827 /// \brief Determines whether the signature must be input before the message
2828 /// \return true if the signature must be input before the message during verifcation
2829 /// \details if SignatureUpfront() returns true, then you must input the signature before the message
2830 /// during verification. Otherwise you can input the signature at anytime.
2831 virtual bool SignatureUpfront() const {return false;}
2832
2833 /// \brief Determines whether the recoverable part must be input before the non-recoverable part
2834 /// \return true if the recoverable part must be input before the non-recoverable part during signing
2835 /// \details RecoverablePartFirst() determines whether you must input the recoverable part before the
2836 /// non-recoverable part during signing
2837 virtual bool RecoverablePartFirst() const =0;
2838 };
2839
2840 /// \brief Interface for accumulating messages to be signed or verified
2841 /// \details Only Update() should be called from the PK_MessageAccumulator() class. No other functions
2842 /// inherited from HashTransformation, like DigestSize() and TruncatedFinal(), should be called.
2843 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_MessageAccumulator : public HashTransformation
2844 {
2845 public:
2846 /// \warning DigestSize() should not be called on PK_MessageAccumulator
2847 unsigned int DigestSize() const
2848 {throw NotImplemented("PK_MessageAccumulator: DigestSize() should not be called");}
2849
2850 /// \warning TruncatedFinal() should not be called on PK_MessageAccumulator
2851 void TruncatedFinal(byte *digest, size_t digestSize)
2852 {
2853 CRYPTOPP_UNUSED(digest); CRYPTOPP_UNUSED(digestSize);
2854 throw NotImplemented("PK_MessageAccumulator: TruncatedFinal() should not be called");
2855 }
2856 };
2857
2858 /// \brief Interface for public-key signers
2859 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_Signer : public PK_SignatureScheme, public PrivateKeyAlgorithm
2860 {
2861 public:
2862 virtual ~PK_Signer() {}
2863
2864 /// \brief Create a new HashTransformation to accumulate the message to be signed
2865 /// \param rng a RandomNumberGenerator derived class
2866 /// \return a pointer to a PK_MessageAccumulator
2867 /// \details NewSignatureAccumulator() can be used with all signing methods. Sign() will autimatically delete the
2868 /// accumulator pointer. The caller is responsible for deletion if a method is called that takes a reference.
2869 virtual PK_MessageAccumulator * NewSignatureAccumulator(RandomNumberGenerator &rng) const =0;
2870
2871 /// \brief Input a recoverable message to an accumulator
2872 /// \param messageAccumulator a reference to a PK_MessageAccumulator
2873 /// \param recoverableMessage a pointer to the recoverable message part to be signed
2874 /// \param recoverableMessageLength the size of the recoverable message part
2875 virtual void InputRecoverableMessage(PK_MessageAccumulator &messageAccumulator, const byte *recoverableMessage, size_t recoverableMessageLength) const =0;
2876
2877 /// \brief Sign and delete the messageAccumulator
2878 /// \param rng a RandomNumberGenerator derived class
2879 /// \param messageAccumulator a pointer to a PK_MessageAccumulator derived class
2880 /// \param signature a block of bytes for the signature
2881 /// \return actual signature length
2882 /// \details Sign() deletes the messageAccumulator, even if an exception is thrown.
2883 /// \pre <tt>COUNTOF(signature) == MaxSignatureLength()</tt>
2884 virtual size_t Sign(RandomNumberGenerator &rng, PK_MessageAccumulator *messageAccumulator, byte *signature) const;
2885
2886 /// \brief Sign and restart messageAccumulator
2887 /// \param rng a RandomNumberGenerator derived class
2888 /// \param messageAccumulator a pointer to a PK_MessageAccumulator derived class
2889 /// \param signature a block of bytes for the signature
2890 /// \param restart flag indicating whether the messageAccumulator should be restarted
2891 /// \return actual signature length
2892 /// \pre <tt>COUNTOF(signature) == MaxSignatureLength()</tt>
2893 virtual size_t SignAndRestart(RandomNumberGenerator &rng, PK_MessageAccumulator &messageAccumulator, byte *signature, bool restart=true) const =0;
2894
2895 /// \brief Sign a message
2896 /// \param rng a RandomNumberGenerator derived class
2897 /// \param message a pointer to the message
2898 /// \param messageLen the size of the message to be signed
2899 /// \param signature a block of bytes for the signature
2900 /// \return actual signature length
2901 /// \pre <tt>COUNTOF(signature) == MaxSignatureLength()</tt>
2902 virtual size_t SignMessage(RandomNumberGenerator &rng, const byte *message, size_t messageLen, byte *signature) const;
2903
2904 /// \brief Sign a recoverable message
2905 /// \param rng a RandomNumberGenerator derived class
2906 /// \param recoverableMessage a pointer to the recoverable message part to be signed
2907 /// \param recoverableMessageLength the size of the recoverable message part
2908 /// \param nonrecoverableMessage a pointer to the non-recoverable message part to be signed
2909 /// \param nonrecoverableMessageLength the size of the non-recoverable message part
2910 /// \param signature a block of bytes for the signature
2911 /// \return actual signature length
2912 /// \pre <tt>COUNTOF(signature) == MaxSignatureLength(recoverableMessageLength)</tt>
2913 virtual size_t SignMessageWithRecovery(RandomNumberGenerator &rng, const byte *recoverableMessage, size_t recoverableMessageLength,
2914 const byte *nonrecoverableMessage, size_t nonrecoverableMessageLength, byte *signature) const;
2915 };
2916
2917 /// \brief Interface for public-key signature verifiers
2918 /// \details The Recover* functions throw NotImplemented if the signature scheme does not support
2919 /// message recovery.
2920 /// \details The Verify* functions throw InvalidDataFormat if the scheme does support message
2921 /// recovery and the signature contains a non-empty recoverable message part. The
2922 /// Recover* functions should be used in that case.
2923 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_Verifier : public PK_SignatureScheme, public PublicKeyAlgorithm
2924 {
2925 public:
2926 virtual ~PK_Verifier() {}
2927
2928 /// \brief Create a new HashTransformation to accumulate the message to be verified
2929 /// \return a pointer to a PK_MessageAccumulator
2930 /// \details NewVerificationAccumulator() can be used with all verification methods. Verify() will autimatically delete
2931 /// the accumulator pointer. The caller is responsible for deletion if a method is called that takes a reference.
2932 virtual PK_MessageAccumulator * NewVerificationAccumulator() const =0;
2933
2934 /// \brief Input signature into a message accumulator
2935 /// \param messageAccumulator a pointer to a PK_MessageAccumulator derived class
2936 /// \param signature the signature on the message
2937 /// \param signatureLength the size of the signature
2938 virtual void InputSignature(PK_MessageAccumulator &messageAccumulator, const byte *signature, size_t signatureLength) const =0;
2939
2940 /// \brief Check whether messageAccumulator contains a valid signature and message
2941 /// \param messageAccumulator a pointer to a PK_MessageAccumulator derived class
2942 /// \return true if the signature is valid, false otherwise
2943 /// \details Verify() deletes the messageAccumulator, even if an exception is thrown.
2944 virtual bool Verify(PK_MessageAccumulator *messageAccumulator) const;
2945
2946 /// \brief Check whether messageAccumulator contains a valid signature and message, and restart messageAccumulator
2947 /// \param messageAccumulator a reference to a PK_MessageAccumulator derived class
2948 /// \return true if the signature is valid, false otherwise
2949 /// \details VerifyAndRestart() restarts the messageAccumulator
2950 virtual bool VerifyAndRestart(PK_MessageAccumulator &messageAccumulator) const =0;
2951
2952 /// \brief Check whether input signature is a valid signature for input message
2953 /// \param message a pointer to the message to be verified
2954 /// \param messageLen the size of the message
2955 /// \param signature a pointer to the signature over the message
2956 /// \param signatureLen the size of the signature
2957 /// \return true if the signature is valid, false otherwise
2958 virtual bool VerifyMessage(const byte *message, size_t messageLen,
2959 const byte *signature, size_t signatureLen) const;
2960
2961 /// \brief Recover a message from its signature
2962 /// \param recoveredMessage a pointer to the recoverable message part to be verified
2963 /// \param messageAccumulator a pointer to a PK_MessageAccumulator derived class
2964 /// \return the result of the verification operation
2965 /// \details Recover() deletes the messageAccumulator, even if an exception is thrown.
2966 /// \pre <tt>COUNTOF(recoveredMessage) == MaxRecoverableLengthFromSignatureLength(signatureLength)</tt>
2967 virtual DecodingResult Recover(byte *recoveredMessage, PK_MessageAccumulator *messageAccumulator) const;
2968
2969 /// \brief Recover a message from its signature
2970 /// \param recoveredMessage a pointer to the recoverable message part to be verified
2971 /// \param messageAccumulator a pointer to a PK_MessageAccumulator derived class
2972 /// \return the result of the verification operation
2973 /// \details RecoverAndRestart() restarts the messageAccumulator
2974 /// \pre <tt>COUNTOF(recoveredMessage) == MaxRecoverableLengthFromSignatureLength(signatureLength)</tt>
2975 virtual DecodingResult RecoverAndRestart(byte *recoveredMessage, PK_MessageAccumulator &messageAccumulator) const =0;
2976
2977 /// \brief Recover a message from its signature
2978 /// \param recoveredMessage a pointer for the recovered message
2979 /// \param nonrecoverableMessage a pointer to the non-recoverable message part to be signed
2980 /// \param nonrecoverableMessageLength the size of the non-recoverable message part
2981 /// \param signature the signature on the message
2982 /// \param signatureLength the size of the signature
2983 /// \return the result of the verification operation
2984 /// \pre <tt>COUNTOF(recoveredMessage) == MaxRecoverableLengthFromSignatureLength(signatureLength)</tt>
2985 virtual DecodingResult RecoverMessage(byte *recoveredMessage,
2986 const byte *nonrecoverableMessage, size_t nonrecoverableMessageLength,
2987 const byte *signature, size_t signatureLength) const;
2988 };
2989
2990 /// \brief Interface for domains of simple key agreement protocols
2991 /// \details A key agreement domain is a set of parameters that must be shared
2992 /// by two parties in a key agreement protocol, along with the algorithms
2993 /// for generating key pairs and deriving agreed values.
2994 /// \since Crypto++ 3.0
2995 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE SimpleKeyAgreementDomain : public KeyAgreementAlgorithm
2996 {
2997 public:
2998 virtual ~SimpleKeyAgreementDomain() {}
2999
3000 /// \brief Provides the size of the agreed value
3001 /// \return size of agreed value produced in this domain
3002 virtual unsigned int AgreedValueLength() const =0;
3003
3004 /// \brief Provides the size of the private key
3005 /// \return size of private keys in this domain
3006 virtual unsigned int PrivateKeyLength() const =0;
3007
3008 /// \brief Provides the size of the public key
3009 /// \return size of public keys in this domain
3010 virtual unsigned int PublicKeyLength() const =0;
3011
3012 /// \brief Generate private key in this domain
3013 /// \param rng a RandomNumberGenerator derived class
3014 /// \param privateKey a byte buffer for the generated private key in this domain
3015 /// \pre <tt>COUNTOF(privateKey) == PrivateKeyLength()</tt>
3016 virtual void GeneratePrivateKey(RandomNumberGenerator &rng, byte *privateKey) const =0;
3017
3018 /// \brief Generate a public key from a private key in this domain
3019 /// \param rng a RandomNumberGenerator derived class
3020 /// \param privateKey a byte buffer with the previously generated private key
3021 /// \param publicKey a byte buffer for the generated public key in this domain
3022 /// \pre <tt>COUNTOF(publicKey) == PublicKeyLength()</tt>
3023 virtual void GeneratePublicKey(RandomNumberGenerator &rng, const byte *privateKey, byte *publicKey) const =0;
3024
3025 /// \brief Generate a private/public key pair
3026 /// \param rng a RandomNumberGenerator derived class
3027 /// \param privateKey a byte buffer for the generated private key in this domain
3028 /// \param publicKey a byte buffer for the generated public key in this domain
3029 /// \details GenerateKeyPair() is equivalent to calling GeneratePrivateKey() and then GeneratePublicKey().
3030 /// \pre <tt>COUNTOF(privateKey) == PrivateKeyLength()</tt>
3031 /// \pre <tt>COUNTOF(publicKey) == PublicKeyLength()</tt>
3032 virtual void GenerateKeyPair(RandomNumberGenerator &rng, byte *privateKey, byte *publicKey) const;
3033
3034 /// \brief Derive agreed value
3035 /// \param agreedValue a byte buffer for the shared secret
3036 /// \param privateKey a byte buffer with your private key in this domain
3037 /// \param otherPublicKey a byte buffer with the other party's public key in this domain
3038 /// \param validateOtherPublicKey a flag indicating if the other party's public key should be validated
3039 /// \return true upon success, false in case of failure
3040 /// \details Agree() derives an agreed value from your private keys and couterparty's public keys.
3041 /// \details The other party's public key is validated by default. If you have previously validated the
3042 /// static public key, use <tt>validateStaticOtherPublicKey=false</tt> to save time.
3043 /// \pre <tt>COUNTOF(agreedValue) == AgreedValueLength()</tt>
3044 /// \pre <tt>COUNTOF(privateKey) == PrivateKeyLength()</tt>
3045 /// \pre <tt>COUNTOF(otherPublicKey) == PublicKeyLength()</tt>
3046 virtual bool Agree(byte *agreedValue, const byte *privateKey, const byte *otherPublicKey, bool validateOtherPublicKey=true) const =0;
3047 };
3048
3049 /// \brief Interface for domains of authenticated key agreement protocols
3050 /// \details In an authenticated key agreement protocol, each party has two
3051 /// key pairs. The long-lived key pair is called the static key pair,
3052 /// and the short-lived key pair is called the ephemeral key pair.
3053 /// \since Crypto++ 3.0
3054 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE AuthenticatedKeyAgreementDomain : public KeyAgreementAlgorithm
3055 {
3056 public:
3057 virtual ~AuthenticatedKeyAgreementDomain() {}
3058
3059 /// \brief Provides the size of the agreed value
3060 /// \return size of agreed value produced in this domain
3061 virtual unsigned int AgreedValueLength() const =0;
3062
3063 /// \brief Provides the size of the static private key
3064 /// \return size of static private keys in this domain
3065 virtual unsigned int StaticPrivateKeyLength() const =0;
3066
3067 /// \brief Provides the size of the static public key
3068 /// \return size of static public keys in this domain
3069 virtual unsigned int StaticPublicKeyLength() const =0;
3070
3071 /// \brief Generate static private key in this domain
3072 /// \param rng a RandomNumberGenerator derived class
3073 /// \param privateKey a byte buffer for the generated private key in this domain
3074 /// \pre <tt>COUNTOF(privateKey) == PrivateStaticKeyLength()</tt>
3075 virtual void GenerateStaticPrivateKey(RandomNumberGenerator &rng, byte *privateKey) const =0;
3076
3077 /// \brief Generate a static public key from a private key in this domain
3078 /// \param rng a RandomNumberGenerator derived class
3079 /// \param privateKey a byte buffer with the previously generated private key
3080 /// \param publicKey a byte buffer for the generated public key in this domain
3081 /// \pre <tt>COUNTOF(publicKey) == PublicStaticKeyLength()</tt>
3082 virtual void GenerateStaticPublicKey(RandomNumberGenerator &rng, const byte *privateKey, byte *publicKey) const =0;
3083
3084 /// \brief Generate a static private/public key pair
3085 /// \param rng a RandomNumberGenerator derived class
3086 /// \param privateKey a byte buffer for the generated private key in this domain
3087 /// \param publicKey a byte buffer for the generated public key in this domain
3088 /// \details GenerateStaticKeyPair() is equivalent to calling GenerateStaticPrivateKey() and then GenerateStaticPublicKey().
3089 /// \pre <tt>COUNTOF(privateKey) == PrivateStaticKeyLength()</tt>
3090 /// \pre <tt>COUNTOF(publicKey) == PublicStaticKeyLength()</tt>
3091 virtual void GenerateStaticKeyPair(RandomNumberGenerator &rng, byte *privateKey, byte *publicKey) const;
3092
3093 /// \brief Provides the size of ephemeral private key
3094 /// \return the size of ephemeral private key in this domain
3095 virtual unsigned int EphemeralPrivateKeyLength() const =0;
3096
3097 /// \brief Provides the size of ephemeral public key
3098 /// \return the size of ephemeral public key in this domain
3099 virtual unsigned int EphemeralPublicKeyLength() const =0;
3100
3101 /// \brief Generate ephemeral private key
3102 /// \param rng a RandomNumberGenerator derived class
3103 /// \param privateKey a byte buffer for the generated private key in this domain
3104 /// \pre <tt>COUNTOF(privateKey) == PrivateEphemeralKeyLength()</tt>
3105 virtual void GenerateEphemeralPrivateKey(RandomNumberGenerator &rng, byte *privateKey) const =0;
3106
3107 /// \brief Generate ephemeral public key
3108 /// \param rng a RandomNumberGenerator derived class
3109 /// \param privateKey a byte buffer for the generated private key in this domain
3110 /// \param publicKey a byte buffer for the generated public key in this domain
3111 /// \pre <tt>COUNTOF(publicKey) == PublicEphemeralKeyLength()</tt>
3112 virtual void GenerateEphemeralPublicKey(RandomNumberGenerator &rng, const byte *privateKey, byte *publicKey) const =0;
3113
3114 /// \brief Generate private/public key pair
3115 /// \param rng a RandomNumberGenerator derived class
3116 /// \param privateKey a byte buffer for the generated private key in this domain
3117 /// \param publicKey a byte buffer for the generated public key in this domain
3118 /// \details GenerateEphemeralKeyPair() is equivalent to calling GenerateEphemeralPrivateKey() and then GenerateEphemeralPublicKey()
3119 virtual void GenerateEphemeralKeyPair(RandomNumberGenerator &rng, byte *privateKey, byte *publicKey) const;
3120
3121 /// \brief Derive agreed value
3122 /// \param agreedValue a byte buffer for the shared secret
3123 /// \param staticPrivateKey a byte buffer with your static private key in this domain
3124 /// \param ephemeralPrivateKey a byte buffer with your ephemeral private key in this domain
3125 /// \param staticOtherPublicKey a byte buffer with the other party's static public key in this domain
3126 /// \param ephemeralOtherPublicKey a byte buffer with the other party's ephemeral public key in this domain
3127 /// \param validateStaticOtherPublicKey a flag indicating if the other party's public key should be validated
3128 /// \return true upon success, false in case of failure
3129 /// \details Agree() derives an agreed value from your private keys and couterparty's public keys.
3130 /// \details The other party's ephemeral public key is validated by default. If you have previously validated
3131 /// the static public key, use <tt>validateStaticOtherPublicKey=false</tt> to save time.
3132 /// \pre <tt>COUNTOF(agreedValue) == AgreedValueLength()</tt>
3133 /// \pre <tt>COUNTOF(staticPrivateKey) == StaticPrivateKeyLength()</tt>
3134 /// \pre <tt>COUNTOF(ephemeralPrivateKey) == EphemeralPrivateKeyLength()</tt>
3135 /// \pre <tt>COUNTOF(staticOtherPublicKey) == StaticPublicKeyLength()</tt>
3136 /// \pre <tt>COUNTOF(ephemeralOtherPublicKey) == EphemeralPublicKeyLength()</tt>
3137 virtual bool Agree(byte *agreedValue,
3138 const byte *staticPrivateKey, const byte *ephemeralPrivateKey,
3139 const byte *staticOtherPublicKey, const byte *ephemeralOtherPublicKey,
3140 bool validateStaticOtherPublicKey=true) const =0;
3141 };
3142
3143 // interface for password authenticated key agreement protocols, not implemented yet
3144 #if 0
3145 /// \brief Interface for protocol sessions
3146 /*! The methods should be called in the following order:
3147
3148 InitializeSession(rng, parameters); // or call initialize method in derived class
3149 while (true)
3150 {
3151 if (OutgoingMessageAvailable())
3152 {
3153 length = GetOutgoingMessageLength();
3154 GetOutgoingMessage(message);
3155 ; // send outgoing message
3156 }
3157
3158 if (LastMessageProcessed())
3159 break;
3160
3161 ; // receive incoming message
3162 ProcessIncomingMessage(message);
3163 }
3164 ; // call methods in derived class to obtain result of protocol session
3165 */
3166 class ProtocolSession
3167 {
3168 public:
3169 /// Exception thrown when an invalid protocol message is processed
3170 class ProtocolError : public Exception
3171 {
3172 public:
3173 ProtocolError(ErrorType errorType, const std::string &s) : Exception(errorType, s) {}
3174 };
3175
3176 /// Exception thrown when a function is called unexpectedly
3177 /*! for example calling ProcessIncomingMessage() when ProcessedLastMessage() == true */
3178 class UnexpectedMethodCall : public Exception
3179 {
3180 public:
3181 UnexpectedMethodCall(const std::string &s) : Exception(OTHER_ERROR, s) {}
3182 };
3183
3184 virtual ~ProtocolSession() {}
3185
3186 ProtocolSession() : m_rng(NULLPTR), m_throwOnProtocolError(true), m_validState(false) {}
3187
3188 virtual void InitializeSession(RandomNumberGenerator &rng, const NameValuePairs &parameters) =0;
3189
3190 bool GetThrowOnProtocolError() const {return m_throwOnProtocolError;}
3191 void SetThrowOnProtocolError(bool throwOnProtocolError) {m_throwOnProtocolError = throwOnProtocolError;}
3192
3193 bool HasValidState() const {return m_validState;}
3194
3195 virtual bool OutgoingMessageAvailable() const =0;
3196 virtual unsigned int GetOutgoingMessageLength() const =0;
3197 virtual void GetOutgoingMessage(byte *message) =0;
3198
3199 virtual bool LastMessageProcessed() const =0;
3200 virtual void ProcessIncomingMessage(const byte *message, unsigned int messageLength) =0;
3201
3202 protected:
3203 void HandleProtocolError(Exception::ErrorType errorType, const std::string &s) const;
3204 void CheckAndHandleInvalidState() const;
3205 void SetValidState(bool valid) {m_validState = valid;}
3206
3207 RandomNumberGenerator *m_rng;
3208
3209 private:
3210 bool m_throwOnProtocolError, m_validState;
3211 };
3212
3213 class KeyAgreementSession : public ProtocolSession
3214 {
3215 public:
3216 virtual ~KeyAgreementSession() {}
3217
3218 virtual unsigned int GetAgreedValueLength() const =0;
3219 virtual void GetAgreedValue(byte *agreedValue) const =0;
3220 };
3221
3222 class PasswordAuthenticatedKeyAgreementSession : public KeyAgreementSession
3223 {
3224 public:
3225 virtual ~PasswordAuthenticatedKeyAgreementSession() {}
3226
3227 void InitializePasswordAuthenticatedKeyAgreementSession(RandomNumberGenerator &rng,
3228 const byte *myId, unsigned int myIdLength,
3229 const byte *counterPartyId, unsigned int counterPartyIdLength,
3230 const byte *passwordOrVerifier, unsigned int passwordOrVerifierLength);
3231 };
3232
3233 /// \brief Password based key agreement domain
3234 /// \since Crypto++ 3.0
3235 class PasswordAuthenticatedKeyAgreementDomain : public KeyAgreementAlgorithm
3236 {
3237 public:
3238 virtual ~PasswordAuthenticatedKeyAgreementDomain() {}
3239
3240 /// return whether the domain parameters stored in this object are valid
3241 virtual bool ValidateDomainParameters(RandomNumberGenerator &rng) const
3242 {return GetCryptoParameters().Validate(rng, 2);}
3243
3244 virtual unsigned int GetPasswordVerifierLength(const byte *password, unsigned int passwordLength) const =0;
3245 virtual void GeneratePasswordVerifier(RandomNumberGenerator &rng, const byte *userId, unsigned int userIdLength, const byte *password, unsigned int passwordLength, byte *verifier) const =0;
3246
3247 enum RoleFlags {CLIENT=1, SERVER=2, INITIATOR=4, RESPONDER=8};
3248
3249 virtual bool IsValidRole(unsigned int role) =0;
3250 virtual PasswordAuthenticatedKeyAgreementSession * CreateProtocolSession(unsigned int role) const =0;
3251 };
3252 #endif
3253
3254 /// \brief Exception thrown when an ASN.1 BER decoing error is encountered
3255 class CRYPTOPP_DLL BERDecodeErr : public InvalidArgument
3256 {
3257 public:
3258 BERDecodeErr() : InvalidArgument("BER decode error") {}
3259 BERDecodeErr(const std::string &s) : InvalidArgument(s) {}
3260 };
3261
3262 /// \brief Interface for encoding and decoding ASN1 objects
3263 /// \details Each class that derives from ASN1Object should provide a serialization format
3264 /// that controls subobject layout. Most of the time the serialization format is
3265 /// taken from a standard, like P1363 or an RFC.
3266 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE ASN1Object
3267 {
3268 public:
3269 virtual ~ASN1Object() {}
3270
3271 /// \brief Decode this object from a BufferedTransformation
3272 /// \param bt BufferedTransformation object
3273 /// \details Uses Basic Encoding Rules (BER)
3274 virtual void BERDecode(BufferedTransformation &bt) =0;
3275
3276 /// \brief Encode this object into a BufferedTransformation
3277 /// \param bt BufferedTransformation object
3278 /// \details Uses Distinguished Encoding Rules (DER)
3279 virtual void DEREncode(BufferedTransformation &bt) const =0;
3280
3281 /// \brief Encode this object into a BufferedTransformation
3282 /// \param bt BufferedTransformation object
3283 /// \details Uses Basic Encoding Rules (BER).
3284 /// \details This may be useful if DEREncode() would be too inefficient.
3285 virtual void BEREncode(BufferedTransformation &bt) const {DEREncode(bt);}
3286 };
3287
3288 /// \brief Specifies the build-time version of the library
3289 /// \return integer representing the build-time version
3290 /// \details LibraryVersion can help detect inadvertent mixing and matching of library
3291 /// versions. When using Crypto++ distributed by a third party, LibraryVersion()
3292 /// records the version of the shared object that was built by the third party.
3293 /// The LibraryVersion() record resides in <tt>cryptlib.o</tt> on Unix compatibles
3294 /// and <tt>cryptlib.obj</tt> on Windows. It does not change when an app links
3295 /// to the library.
3296 /// \details LibraryVersion() is declared with C linkage (<tt>extern "C"</tt>) within the
3297 /// CryptoPP namespace to help programs locate the symbol. If the symbol is present, then
3298 /// the library version is 5.7 or above. If it is missing, then the library version is
3299 /// 5.6.5 or below.
3300 /// \details The function could be used as shown below.
3301 /// <pre> if (LibraryVersion() != HeaderVersion())
3302 /// {
3303 /// cout << "Potential version mismatch" << endl;
3304 ///
3305 /// const int lmaj = (LibraryVersion() / 100U) % 10;
3306 /// const int lmin = (LibraryVersion() / 10U) % 10;
3307 /// const int hmaj = (HeaderVersion() / 100U) % 10;
3308 /// const int hmin = (HeaderVersion() / 10U) % 10;
3309 ///
3310 /// if(lmaj != hmaj)
3311 /// cout << "Major version mismatch" << endl;
3312 /// else if(lmin != hmin)
3313 /// cout << "Minor version mismatch" << endl;
3314 /// }
3315 /// </pre>
3316 /// \sa HeaderVersion(), <A HREF="http://github.com/weidai11/cryptopp/issues/371">GitHub Issue 371</A>.
3317 /// \since Crypto++ 6.0
3318 extern "C" {
3319 int LibraryVersion(CRYPTOPP_NOINLINE_DOTDOTDOT);
3320 } // C linkage
3321
3322 /// \brief Specifies the runtime version of the library
3323 /// \return integer representing the runtime version
3324 /// \details HeaderVersion() can help detect inadvertent mixing and matching of library
3325 /// versions. When using Crypto++ distributed by a third party, HeaderVersion()
3326 /// records the version of the headers used by the app when the app is compiled.
3327 /// \details HeaderVersion() is declared with C linkage (<tt>extern "C"</tt>) within the
3328 /// CryptoPP namespace to help programs locate the symbol. If the symbol is present, then
3329 /// the library version is 5.7 or above. If it is missing, then the library version is
3330 /// 5.6.5 or below.
3331 /// \details The function could be used as shown below.
3332 /// <pre> if (LibraryVersion() != HeaderVersion())
3333 /// {
3334 /// cout << "Potential version mismatch" << endl;
3335 ///
3336 /// const int lmaj = (LibraryVersion() / 100U) % 10;
3337 /// const int lmin = (LibraryVersion() / 10U) % 10;
3338 /// const int hmaj = (HeaderVersion() / 100U) % 10;
3339 /// const int hmin = (HeaderVersion() / 10U) % 10;
3340 ///
3341 /// if(lmaj != hmaj)
3342 /// cout << "Major version mismatch" << endl;
3343 /// else if(lmin != hmin)
3344 /// cout << "Minor version mismatch" << endl;
3345 /// }
3346 /// </pre>
3347 /// \sa LibraryVersion(), <A HREF="http://github.com/weidai11/cryptopp/issues/371">GitHub Issue 371</A>.
3348 /// \since Crypto++ 6.0
3349 extern "C" {
3350 inline int HeaderVersion()
3351 {
3352 return CRYPTOPP_VERSION;
3353 }
3354 } // C linkage
3355
3356 NAMESPACE_END
3357
3358 #if CRYPTOPP_MSC_VERSION
3359 # pragma warning(pop)
3360 #endif
3361
3362 #endif
ASN1Object::BEREncode
virtual void BEREncode(BufferedTransformation &bt) const
Encode this object into a BufferedTransformation.
Definition: cryptlib.h:3285
CannotFlush::CannotFlush
CannotFlush(const std::string &s)
Construct an CannotFlush.
Definition: cryptlib.h:248
AsymmetricAlgorithm
Interface for asymmetric algorithms.
Definition: cryptlib.h:2542
PK_Encryptor
Interface for public-key encryptors.
Definition: cryptlib.h:2680
SimpleKeyingInterface::UNPREDICTABLE_RANDOM_IV
@ UNPREDICTABLE_RANDOM_IV
The IV must be random and unpredictable.
Definition: cryptlib.h:725
NameValuePairs::GetThisObject
bool GetThisObject(T &object) const
Get a copy of this object or subobject.
Definition: cryptlib.h:357
PK_CryptoSystem::FixedMaxPlaintextLength
virtual size_t FixedMaxPlaintextLength() const
Provides the maximum plaintext length given a fixed ciphertext length.
Definition: cryptlib.h:2676
PrivateKey
Interface for private keys.
Definition: cryptlib.h:2523
HashTransformation::Ref
HashTransformation & Ref()
Provides a reference to this object.
Definition: cryptlib.h:1120
EnumToType
Converts an enumeration to a type suitable for use as a template parameter.
Definition: cryptlib.h:135
PK_CryptoSystem
Interface for public-key encryptors and decryptors.
Definition: cryptlib.h:2643
NameValuePairs::GetValueWithDefault
T GetValueWithDefault(const char *name, T defaultValue) const
Get a named value.
Definition: cryptlib.h:392
BufferedTransformation::AttachedTransformation
virtual BufferedTransformation * AttachedTransformation()
Returns the object immediately attached to this object.
Definition: cryptlib.h:2324
BufferedTransformation::PutModifiable
size_t PutModifiable(byte *inString, size_t length, bool blocking=true)
Input multiple bytes that may be modified by callee.
Definition: cryptlib.h:1718
Algorithm::AlgorithmName
virtual std::string AlgorithmName() const
Provides the name of this algorithm.
Definition: cryptlib.h:619
NotImplemented
A method was called which was not implemented.
Definition: cryptlib.h:232
InvalidDataFormat::InvalidDataFormat
InvalidDataFormat(const std::string &s)
Construct an InvalidDataFormat.
Definition: cryptlib.h:218
BlockTransformation::ProcessBlock
void ProcessBlock(const byte *inBlock, byte *outBlock) const
Encrypt or decrypt a block.
Definition: cryptlib.h:879
PK_SignatureScheme
Interface for public-key signers and verifiers.
Definition: cryptlib.h:2767
NameValuePairs::ValueTypeMismatch::GetStoredTypeInfo
const std::type_info & GetStoredTypeInfo() const
Provides the stored type.
Definition: cryptlib.h:342
Exception::GetErrorType
ErrorType GetErrorType() const
Retrieves the error type for the exception.
Definition: cryptlib.h:192
CryptoParameters
Interface for crypto prameters.
Definition: cryptlib.h:2528
SimpleKeyAgreementDomain
Interface for domains of simple key agreement protocols.
Definition: cryptlib.h:2995
HashTransformation::VerifyTruncatedDigest
virtual bool VerifyTruncatedDigest(const byte *digest, size_t digestLength, const byte *input, size_t length)
Updates the hash with additional input and verifies the hash of the current message.
Definition: cryptlib.h:1269
StreamTransformation::IsLastBlockSpecial
virtual bool IsLastBlockSpecial() const
Determines if the last block receives special processing.
Definition: cryptlib.h:1054
NameValuePairs::GetRequiredIntParameter
CRYPTOPP_DLL void GetRequiredIntParameter(const char *className, const char *name, int &value) const
Retrieves a required name/value pair.
Definition: cryptlib.h:483
OS_Error
The operating system reported an error.
Definition: cryptlib.h:252
BIG_ENDIAN_ORDER
@ BIG_ENDIAN_ORDER
byte order is big-endian
Definition: cryptlib.h:147
trap.h
Debugging and diagnostic assertions.
StreamTransformation::MandatoryBlockSize
virtual unsigned int MandatoryBlockSize() const
Provides the mandatory block size of the cipher.
Definition: cryptlib.h:965
BufferedTransformation::BufferedTransformation
BufferedTransformation()
Construct a BufferedTransformation.
Definition: cryptlib.h:1640
ASN1Object
Interface for encoding and decoding ASN1 objects.
Definition: cryptlib.h:3266
BufferedTransformation::ChannelMessageEnd
bool ChannelMessageEnd(const std::string &channel, int propagation=-1, bool blocking=true)
Signal the end of a message.
Definition: cryptlib.h:2235
DECRYPTION
@ DECRYPTION
the cipher is performing decryption
Definition: cryptlib.h:127
PrivateKeyAlgorithm::GetMaterial
const CryptoMaterial & GetMaterial() const
Retrieves a reference to a Private Key.
Definition: cryptlib.h:2609
BufferedTransformation::IsolatedInitialize
virtual void IsolatedInitialize(const NameValuePairs &parameters)
Initialize or reinitialize this object, without signal propagation.
Definition: cryptlib.h:1799
KeyAgreementAlgorithm::GetMaterial
const CryptoMaterial & GetMaterial() const
Retrieves a reference to Crypto Parameters.
Definition: cryptlib.h:2630
PK_SignatureScheme::AllowNonrecoverablePart
virtual bool AllowNonrecoverablePart() const =0
Determines whether the non-recoverable message part can be signed.
INFINITE_TIME
const unsigned long INFINITE_TIME
Represents infinite time.
Definition: cryptlib.h:130
Algorithm
Interface for all crypto algorithms.
Definition: cryptlib.h:598
PrivateKeyAlgorithm::AccessMaterial
CryptoMaterial & AccessMaterial()
Retrieves a reference to a Private Key.
Definition: cryptlib.h:2606
NameValuePairs::GetVoidValue
virtual CRYPTOPP_DLL bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const =0
Get a named value.
NameValuePairs::GetValueNames
CRYPTOPP_DLL std::string GetValueNames() const
Get a list of value names that can be retrieved.
Definition: cryptlib.h:404
HashTransformation
Interface for hash functions and data processing part of MACs.
Definition: cryptlib.h:1112
AuthenticatedSymmetricCipher::BadState
Exception thrown when the object is in the wrong state for the operation.
Definition: cryptlib.h:1328
HashTransformation::CalculateDigest
virtual void CalculateDigest(byte *digest, const byte *input, size_t length)
Updates the hash with additional input and computes the hash of the current message.
Definition: cryptlib.h:1188
NameValuePairs::ThrowIfTypeMismatch
static CRYPTOPP_DLL void ThrowIfTypeMismatch(const char *name, const std::type_info &stored, const std::type_info &retrieving)
Ensures an expected name and type is present.
Definition: cryptlib.h:454
BufferedTransformation::Attachable
virtual bool Attachable()
Determines whether the object allows attachment.
Definition: cryptlib.h:2318
BufferedTransformation
Interface for buffered transformations.
Definition: cryptlib.h:1634
BufferedTransformation::ChannelPut
size_t ChannelPut(const std::string &channel, const byte *inString, size_t length, bool blocking=true)
Input a byte buffer for processing on a channel.
Definition: cryptlib.h:2187
CryptoMaterial::ThrowIfInvalid
virtual void ThrowIfInvalid(RandomNumberGenerator &rng, unsigned int level) const
Check this object for errors.
Definition: cryptlib.h:2410
PK_SignatureScheme::SignatureLength
virtual size_t SignatureLength() const =0
Provides the signature length if it only depends on the key.
NameValuePairs::GetWord64Value
CRYPTOPP_DLL bool GetWord64Value(const char *name, word64 &value) const
Get a named value with type word64.
Definition: cryptlib.h:433
SymmetricCipher
Interface for one direction (encryption or decryption) of a stream cipher or cipher mode.
Definition: cryptlib.h:1290
SimpleKeyingInterface
Interface for algorithms that take byte strings as keys.
Definition: cryptlib.h:641
BufferedTransformation::ChannelPutMessageEnd
size_t ChannelPutMessageEnd(const std::string &channel, const byte *inString, size_t length, int propagation=-1, bool blocking=true)
Input multiple bytes for processing and signal the end of a message.
Definition: cryptlib.h:2247
BufferedTransformation::PutMessageEnd
size_t PutMessageEnd(const byte *inString, size_t length, int propagation=-1, bool blocking=true)
Input multiple bytes for processing and signal the end of a message.
Definition: cryptlib.h:1740
Clonable
Interface for cloning objects.
Definition: cryptlib.h:584
CRYPTOPP_ASSERT
#define CRYPTOPP_ASSERT(exp)
Debugging and diagnostic assertion.
Definition: trap.h:68
BufferedTransformation::BlockingInputOnly
Exception thrown by objects that have not implemented nonblocking input processing.
Definition: cryptlib.h:1766
BufferedTransformation::CopyRangeTo
lword CopyRangeTo(BufferedTransformation &target, lword position, lword copyMax=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL) const
Copy bytes from this object using an index to another BufferedTransformation.
Definition: cryptlib.h:2009
StreamTransformation::ProcessString
void ProcessString(byte *outString, const byte *inString, size_t length)
Encrypt or decrypt a string of bytes.
Definition: cryptlib.h:1068
PK_Encryptor::InvalidPlaintextLength
Exception thrown when trying to encrypt plaintext of invalid length.
Definition: cryptlib.h:2684
SimpleKeyingInterface::MaxIVLength
virtual unsigned int MaxIVLength() const
Provides the maximum size of an IV.
Definition: cryptlib.h:776
Exception::what
const char * what() const
Retrieves a C-string describing the exception.
Definition: cryptlib.h:186
NameValuePairs::ValueTypeMismatch::ValueTypeMismatch
ValueTypeMismatch(const std::string &name, const std::type_info &stored, const std::type_info &retrieving)
Construct a ValueTypeMismatch.
Definition: cryptlib.h:336
NullRNG
CRYPTOPP_DLL RandomNumberGenerator & NullRNG()
Random Number Generator that does not produce random numbers.
PK_SignatureScheme::IsProbabilistic
virtual bool IsProbabilistic() const =0
Determines whether a signature scheme requires a random number generator.
PK_MessageAccumulator::DigestSize
unsigned int DigestSize() const
Definition: cryptlib.h:2847
PK_MessageAccumulator::TruncatedFinal
void TruncatedFinal(byte *digest, size_t digestSize)
Definition: cryptlib.h:2851
InvalidDataFormat
Input data was received that did not conform to expected format.
Definition: cryptlib.h:212
LITTLE_ENDIAN_ORDER
@ LITTLE_ENDIAN_ORDER
byte order is little-endian
Definition: cryptlib.h:145
BufferedTransformation::PutModifiable2
virtual size_t PutModifiable2(byte *inString, size_t length, int messageEnd, bool blocking)
Input multiple bytes that may be modified by callee.
Definition: cryptlib.h:1761
BufferedTransformation::InvalidChannelName
Exception thrown when a filter does not recognize a named channel.
Definition: cryptlib.h:2168
PK_Decryptor
Interface for public-key decryptors.
Definition: cryptlib.h:2715
CryptoMaterial::Precompute
virtual void Precompute(unsigned int precomputationStorage)
Perform precomputation.
Definition: cryptlib.h:2455
BufferedTransformation::Put
size_t Put(byte inByte, bool blocking=true)
Input a byte for processing.
Definition: cryptlib.h:1656
Exception::INVALID_DATA_FORMAT
@ INVALID_DATA_FORMAT
Input data was received that did not conform to expected format.
Definition: cryptlib.h:173
ENCRYPTION
@ ENCRYPTION
the cipher is performing encryption
Definition: cryptlib.h:125
BufferedTransformation::TransferAllTo
void TransferAllTo(BufferedTransformation &target, const std::string &channel=DEFAULT_CHANNEL)
Transfer all bytes from this object to another BufferedTransformation.
Definition: cryptlib.h:2076
DEFAULT_CHANNEL
const std::string DEFAULT_CHANNEL
Default channel for BufferedTransformation.
Definition: cryptlib.h:511
BufferedTransformation::CanModifyInput
virtual bool CanModifyInput() const
Determines whether input can be modified by the callee.
Definition: cryptlib.h:1709
Waitable
Interface for objects that can be waited on.
Definition: cryptlib.h:1585
word64
unsigned long long word64
64-bit unsigned datatype
Definition: config_int.h:91
Waitable::GetWaitObjects
virtual void GetWaitObjects(WaitObjectContainer &container, CallStack const &callStack)=0
Retrieves waitable objects.
HashTransformation::VerifyDigest
virtual bool VerifyDigest(const byte *digest, const byte *input, size_t length)
Updates the hash with additional input and verifies the hash of the current message.
Definition: cryptlib.h:1216
PK_SignatureScheme::KeyTooShort
Exception throw when the private or public key is too short to sign or verify.
Definition: cryptlib.h:2782
BufferedTransformation::ChannelPutModifiable
size_t ChannelPutModifiable(const std::string &channel, byte *inString, size_t length, bool blocking=true)
Input multiple bytes that may be modified by callee on a channel.
Definition: cryptlib.h:2197
BufferedTransformation::NoChannelSupport
Exception thrown when a filter does not support named channels.
Definition: cryptlib.h:2165
CryptoMaterial::DoQuickSanityCheck
void DoQuickSanityCheck() const
Perform a quick sanity check.
Definition: cryptlib.h:2476
word32
unsigned int word32
32-bit unsigned datatype
Definition: config_int.h:62
AuthenticatedKeyAgreementDomain
Interface for domains of authenticated key agreement protocols.
Definition: cryptlib.h:3054
RandomNumberGenerator::CanIncorporateEntropy
virtual bool CanIncorporateEntropy() const
Determines if a generator can accept additional entropy.
Definition: cryptlib.h:1438
LibraryVersion
int LibraryVersion(...)
Specifies the build-time version of the library.
Exception::INVALID_ARGUMENT
@ INVALID_ARGUMENT
An invalid argument was detected.
Definition: cryptlib.h:167
CryptoMaterial::LoadPrecomputation
virtual void LoadPrecomputation(BufferedTransformation &storedPrecomputation)
Retrieve previously saved precomputation.
Definition: cryptlib.h:2464
AAD_CHANNEL
const std::string AAD_CHANNEL
Channel for additional authenticated data.
Definition: cryptlib.h:520
SimpleKeyingInterface::IsValidKeyLength
virtual bool IsValidKeyLength(size_t keylength) const
Returns whether keylength is a valid key length.
Definition: cryptlib.h:672
TheBitBucket
CRYPTOPP_DLL BufferedTransformation & TheBitBucket()
An input discarding BufferedTransformation.
Clonable::Clone
virtual Clonable * Clone() const
Copies this object.
Definition: cryptlib.h:594
RandomNumberGenerator
Interface for random number generators.
Definition: cryptlib.h:1417
CipherDir
CipherDir
Specifies a direction for a cipher to operate.
Definition: cryptlib.h:123
Exception::SetErrorType
void SetErrorType(ErrorType errorType)
Sets the error type for the exceptions.
Definition: cryptlib.h:194
NameValuePairs::ValueTypeMismatch::GetRetrievingTypeInfo
const std::type_info & GetRetrievingTypeInfo() const
Provides the retrieveing type.
Definition: cryptlib.h:346
SimpleKeyingInterface::IV_Requirement
IV_Requirement
Secure IVs requirements as enumerated values.
Definition: cryptlib.h:719
BlockTransformation::IsPermutation
virtual bool IsPermutation() const
Determines if the transformation is a permutation.
Definition: cryptlib.h:902
PK_SignatureScheme::InvalidKeyLength
Exception throw when the private or public key has a length that can't be used.
Definition: cryptlib.h:2773
BlockTransformation
Interface for the data processing part of block ciphers.
Definition: cryptlib.h:855
CryptoMaterial::Validate
virtual bool Validate(RandomNumberGenerator &rng, unsigned int level) const =0
Check this object for errors.
DecodingResult::messageLength
size_t messageLength
Recovered message length if isValidCoding is true, undefined otherwise.
Definition: cryptlib.h:303
PK_SignatureScheme::MaxRecoverableLength
virtual size_t MaxRecoverableLength() const =0
Provides the length of longest message that can be recovered.
PK_Signer
Interface for public-key signers.
Definition: cryptlib.h:2859
SimpleKeyingInterface::Resynchronize
virtual void Resynchronize(const byte *iv, int ivLength=-1)
Resynchronize with an IV.
Definition: cryptlib.h:783
NameValuePairs::ValueTypeMismatch
Thrown when an unexpected type is encountered.
Definition: cryptlib.h:329
KeyAgreementAlgorithm
Interface for key agreement algorithms.
Definition: cryptlib.h:2620
BufferedTransformation::NumberOfMessagesInThisSeries
virtual unsigned int NumberOfMessagesInThisSeries() const
Provides the number of messages in a series.
Definition: cryptlib.h:2091
Exception
Base class for all exceptions thrown by the library.
Definition: cryptlib.h:158
operator==
bool operator==(const OID &lhs, const OID &rhs)
Compare two OIDs for equality.
BufferedTransformation::Ref
BufferedTransformation & Ref()
Provides a reference to this object.
Definition: cryptlib.h:1645
BufferedTransformation::SetAutoSignalPropagation
virtual void SetAutoSignalPropagation(int propagation)
Set propagation of automatically generated and transferred signals.
Definition: cryptlib.h:1864
StreamTransformation::Seek
virtual void Seek(lword pos)
Seek to an absolute position.
Definition: cryptlib.h:1086
BufferedTransformation::Detach
virtual void Detach(BufferedTransformation *newAttachment=NULL)
Delete the current attachment chain and attach a new one.
Definition: cryptlib.h:2339
BufferedTransformation::CopyTo
lword CopyTo(BufferedTransformation &target, lword copyMax=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL) const
Copy bytes from this object to another BufferedTransformation.
Definition: cryptlib.h:1996
InvalidCiphertext::InvalidCiphertext
InvalidCiphertext(const std::string &s)
Construct an InvalidCiphertext.
Definition: cryptlib.h:228
PrivateKeyAlgorithm
Interface for asymmetric algorithms using private keys.
Definition: cryptlib.h:2599
CryptoMaterial::SavePrecomputation
virtual void SavePrecomputation(BufferedTransformation &storedPrecomputation) const
Save precomputation for later use.
Definition: cryptlib.h:2471
HeaderVersion
int HeaderVersion()
Specifies the runtime version of the library.
Definition: cryptlib.h:3350
Exception::ErrorType
ErrorType
Error types or categories.
Definition: cryptlib.h:163
NameValuePairs::GetRequiredParameter
void GetRequiredParameter(const char *className, const char *name, T &value) const
Retrieves a required name/value pair.
Definition: cryptlib.h:468
BigEndian
EnumToType< ByteOrder, BIG_ENDIAN_ORDER > BigEndian
Provides a constant for BigEndian.
Definition: cryptlib.h:152
BufferedTransformation::Put
size_t Put(const byte *inString, size_t length, bool blocking=true)
Input a byte buffer for processing.
Definition: cryptlib.h:1666
PublicKeyAlgorithm::GetMaterial
const CryptoMaterial & GetMaterial() const
Retrieves a reference to a Public Key.
Definition: cryptlib.h:2586
PK_SignatureScheme::MaxRecoverableLengthFromSignatureLength
virtual size_t MaxRecoverableLengthFromSignatureLength(size_t signatureLength) const =0
Provides the length of longest message that can be recovered from a signature of given length.
PublicKey
Interface for public keys.
Definition: cryptlib.h:2518
PK_MessageAccumulator
Interface for accumulating messages to be signed or verified.
Definition: cryptlib.h:2843
BlockTransformation::GetCipherDirection
CipherDir GetCipherDirection() const
Provides the direction of the cipher.
Definition: cryptlib.h:940
CryptoMaterial::SupportsPrecomputation
virtual bool SupportsPrecomputation() const
Determines whether the object supports precomputation.
Definition: cryptlib.h:2445
DecodingResult
Returns a decoding results.
Definition: cryptlib.h:277
HashTransformation::TagSize
unsigned int TagSize() const
Provides the tag size of the hash.
Definition: cryptlib.h:1157
SimpleKeyingInterface::IsResynchronizable
bool IsResynchronizable() const
Determines if the object can be resynchronized.
Definition: cryptlib.h:740
DecodingResult::DecodingResult
DecodingResult()
Constructs a DecodingResult.
Definition: cryptlib.h:282
SimpleKeyingInterface::INTERNALLY_GENERATED_IV
@ INTERNALLY_GENERATED_IV
The IV is set by the object.
Definition: cryptlib.h:727
NaCl
Namespace containing NaCl library functions.
Definition: cryptlib.h:568
SimpleKeyingInterface::IVSize
virtual unsigned int IVSize() const
Returns length of the IV accepted by this object.
Definition: cryptlib.h:761
BufferedTransformation::AttachedTransformation
virtual const BufferedTransformation * AttachedTransformation() const
Returns the object immediately attached to this object.
Definition: cryptlib.h:2330
Exception::DATA_INTEGRITY_CHECK_FAILED
@ DATA_INTEGRITY_CHECK_FAILED
Data integerity check, such as CRC or MAC, failed.
Definition: cryptlib.h:171
StreamTransformation::OptimalBlockSize
virtual unsigned int OptimalBlockSize() const
Provides the input block size most efficient for this cipher.
Definition: cryptlib.h:972
ByteOrder
ByteOrder
Provides the byte ordering.
Definition: cryptlib.h:143
DecodingResult::DecodingResult
DecodingResult(size_t len)
Constructs a DecodingResult.
Definition: cryptlib.h:286
PK_CryptoSystem::FixedCiphertextLength
virtual size_t FixedCiphertextLength() const
Provides the fixed ciphertext length, if one exists.
Definition: cryptlib.h:2669
stdcpp.h
Common C++ header files.
BlockTransformation::ProcessBlock
void ProcessBlock(byte *inoutBlock) const
Encrypt or decrypt a block in place.
Definition: cryptlib.h:888
BlockTransformation::FlagsForAdvancedProcessBlocks
FlagsForAdvancedProcessBlocks
Bit flags that control AdvancedProcessBlocks() behavior.
Definition: cryptlib.h:915
HashTransformation::BlockSize
virtual unsigned int BlockSize() const
Provides the block size of the compression function.
Definition: cryptlib.h:1165
BufferedTransformation::TransferTo
lword TransferTo(BufferedTransformation &target, lword transferMax=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL)
move transferMax bytes of the buffered output to target as input
Definition: cryptlib.h:1974
AuthenticatedSymmetricCipher::NeedsPrespecifiedDataLengths
virtual bool NeedsPrespecifiedDataLengths() const
Determines if data lengths must be specified prior to inputting data.
Definition: cryptlib.h:1352
DecodingResult::operator==
bool operator==(const DecodingResult &rhs) const
Compare two DecodingResult.
Definition: cryptlib.h:292
NameValuePairs::GetIntValue
CRYPTOPP_DLL bool GetIntValue(const char *name, int &value) const
Get a named value with type int.
Definition: cryptlib.h:415
OS_Error::OS_Error
OS_Error(ErrorType errorType, const std::string &s, const std::string &operation, int errorCode)
Construct an OS_Error.
Definition: cryptlib.h:263
Test
Namespace containing testing and benchmark classes.
Definition: cryptlib.h:575
StreamTransformation::ProcessByte
byte ProcessByte(byte input)
Encrypt or decrypt a byte.
Definition: cryptlib.h:1074
StreamTransformation::ProcessString
void ProcessString(byte *inoutString, size_t length)
Encrypt or decrypt a string of bytes.
Definition: cryptlib.h:1060
DecodingResult::operator!=
bool operator!=(const DecodingResult &rhs) const
Compare two DecodingResult.
Definition: cryptlib.h:298
StreamTransformation::MinLastBlockSize
virtual unsigned int MinLastBlockSize() const
Provides the size of the last block.
Definition: cryptlib.h:1021
KeyAgreementAlgorithm::AccessMaterial
CryptoMaterial & AccessMaterial()
Retrieves a reference to Crypto Parameters.
Definition: cryptlib.h:2627
NameValuePairs::GetWord64ValueWithDefault
CRYPTOPP_DLL word64 GetWord64ValueWithDefault(const char *name, word64 defaultValue) const
Get a named value with type word64, with default.
Definition: cryptlib.h:442
BufferedTransformation::TransferMessagesTo
unsigned int TransferMessagesTo(BufferedTransformation &target, unsigned int count=UINT_MAX, const std::string &channel=DEFAULT_CHANNEL)
Transfer messages from this object to another BufferedTransformation.
Definition: cryptlib.h:2054
HashTransformation::OptimalBlockSize
virtual unsigned int OptimalBlockSize() const
Provides the input block size most efficient for this hash.
Definition: cryptlib.h:1172
PK_Decryptor::FixedLengthDecrypt
DecodingResult FixedLengthDecrypt(RandomNumberGenerator &rng, const byte *ciphertext, byte *plaintext, const NameValuePairs &parameters=g_nullNameValuePairs) const
Decrypt a fixed size ciphertext.
Definition: cryptlib.h:2760
Exception::GetWhat
const std::string & GetWhat() const
Retrieves a string describing the exception.
Definition: cryptlib.h:188
OS_Error::GetErrorCode
int GetErrorCode() const
Retrieve the error code returned by the operating system.
Definition: cryptlib.h:269
PublicKeyAlgorithm::AccessMaterial
CryptoMaterial & AccessMaterial()
Retrieves a reference to a Public Key.
Definition: cryptlib.h:2582
SimpleKeyingInterface::CanUsePredictableIVs
bool CanUsePredictableIVs() const
Determines if the object can use random but possibly predictable IVs.
Definition: cryptlib.h:749
KeyDerivationFunction::IsValidDerivedLength
virtual bool IsValidDerivedLength(size_t keylength) const
Returns whether keylength is a valid key length.
Definition: cryptlib.h:1531
HashTransformation::CalculateTruncatedDigest
virtual void CalculateTruncatedDigest(byte *digest, size_t digestSize, const byte *input, size_t length)
Updates the hash with additional input and computes the hash of the current message.
Definition: cryptlib.h:1238
RandomNumberGenerator::Shuffle
void Shuffle(IT begin, IT end)
Randomly shuffle the specified array.
Definition: cryptlib.h:1493
CRYPTOPP_VERSION
#define CRYPTOPP_VERSION
Full library version.
Definition: config_ver.h:53
lword
word64 lword
Large word type.
Definition: config_int.h:158
GeneratableCryptoMaterial::GenerateRandom
virtual void GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs &params=g_nullNameValuePairs)
Generate a random key or crypto parameters.
Definition: cryptlib.h:2503
LittleEndian
EnumToType< ByteOrder, LITTLE_ENDIAN_ORDER > LittleEndian
Provides a constant for LittleEndian.
Definition: cryptlib.h:150
PublicKeyAlgorithm
Interface for asymmetric algorithms using public keys.
Definition: cryptlib.h:2573
Exception::CANNOT_FLUSH
@ CANNOT_FLUSH
BufferedTransformation received a Flush(true) signal but can't flush buffers.
Definition: cryptlib.h:169
KeyAgreementAlgorithm::GetCryptoParameters
virtual const CryptoParameters & GetCryptoParameters() const
Retrieves a reference to Crypto Parameters.
Definition: cryptlib.h:2637
HashTransformation::Verify
virtual bool Verify(const byte *digest)
Verifies the hash of the current message.
Definition: cryptlib.h:1200
InvalidArgument
An invalid argument was detected.
Definition: cryptlib.h:202
BlockTransformation::OptimalNumberOfParallelBlocks
virtual unsigned int OptimalNumberOfParallelBlocks() const
Determines the number of blocks that can be processed in parallel.
Definition: cryptlib.h:912
SimpleKeyingInterface::CanUseStructuredIVs
bool CanUseStructuredIVs() const
Determines if the object can use structured IVs.
Definition: cryptlib.h:755
KeyDerivationFunction
Interface for key derivation functions.
Definition: cryptlib.h:1505
RandomNumberGenerator::IncorporateEntropy
virtual void IncorporateEntropy(const byte *input, size_t length)
Update RNG state with additional unpredictable values.
Definition: cryptlib.h:1430
GeneratableCryptoMaterial
Interface for crypto material.
Definition: cryptlib.h:2492
StreamTransformation::GetOptimalBlockSizeUsed
virtual unsigned int GetOptimalBlockSizeUsed() const
Provides the number of bytes used in the current block when processing at optimal block size.
Definition: cryptlib.h:976
Certificate
Interface for certificates.
Definition: cryptlib.h:2533
SimpleKeyingInterface::MinIVLength
virtual unsigned int MinIVLength() const
Provides the minimum size of an IV.
Definition: cryptlib.h:771
PublicKeyAlgorithm::GetPublicKey
virtual const PublicKey & GetPublicKey() const
Retrieves a reference to a Public Key.
Definition: cryptlib.h:2594
BufferedTransformation::GetNextMessageSeries
virtual bool GetNextMessageSeries()
Retrieve the next message in a series.
Definition: cryptlib.h:2088
PK_SignatureScheme::RecoverablePartFirst
virtual bool RecoverablePartFirst() const =0
Determines whether the recoverable part must be input before the non-recoverable part.
PK_Verifier
Interface for public-key signature verifiers.
Definition: cryptlib.h:2923
Exception::IO_ERROR
@ IO_ERROR
Error reading from input device or writing to output device.
Definition: cryptlib.h:175
OS_Error::GetOperation
const std::string & GetOperation() const
Retrieve the operating system API that reported the error.
Definition: cryptlib.h:267
g_nullNameValuePairs
const NameValuePairs & g_nullNameValuePairs
An empty set of name-value pairs.
Definition: cryptlib.h:529
Name
Namespace containing value name definitions.
Definition: argnames.h:13
CryptoPP
Crypto++ library namespace.
SimpleKeyingInterface::DefaultIVLength
unsigned int DefaultIVLength() const
Provides the default size of an IV.
Definition: cryptlib.h:766
AuthenticatedSymmetricCipher::MaxFooterLength
virtual lword MaxFooterLength() const
Provides the maximum length of AAD.
Definition: cryptlib.h:1345
NameValuePairs::GetValue
bool GetValue(const char *name, T &value) const
Get a named value.
Definition: cryptlib.h:379
Exception::SetWhat
void SetWhat(const std::string &s)
Sets the error string for the exception.
Definition: cryptlib.h:190
CRYPTOPP_API
#define CRYPTOPP_API
Win32 calling convention.
Definition: config_dll.h:119
Exception::NOT_IMPLEMENTED
@ NOT_IMPLEMENTED
A method was called which was not implemented.
Definition: cryptlib.h:165
InvalidArgument::InvalidArgument
InvalidArgument(const std::string &s)
Construct an InvalidArgument.
Definition: cryptlib.h:208
CryptoMaterial
Interface for crypto material.
Definition: cryptlib.h:2372
config.h
Library configuration file.
StreamTransformation::Ref
StreamTransformation & Ref()
Provides a reference to this object.
Definition: cryptlib.h:953
BufferedTransformation::ChannelPut
size_t ChannelPut(const std::string &channel, byte inByte, bool blocking=true)
Input a byte for processing on a channel.
Definition: cryptlib.h:2177
BufferedTransformation::GetAutoSignalPropagation
virtual int GetAutoSignalPropagation() const
Retrieve automatic signal propagation value.
Definition: cryptlib.h:1870
BlockCipher
Interface for one direction (encryption or decryption) of a block cipher.
Definition: cryptlib.h:1282
BufferedTransformation::MessageEnd
bool MessageEnd(int propagation=-1, bool blocking=true)
Signals the end of messages to the object.
Definition: cryptlib.h:1726
PrivateKeyAlgorithm::GetPrivateKey
virtual const PrivateKey & GetPrivateKey() const
Retrieves a reference to a Private Key.
Definition: cryptlib.h:2616
CryptoMaterial::Load
virtual void Load(BufferedTransformation &bt)
Loads a key from a BufferedTransformation.
Definition: cryptlib.h:2439
DecodingResult::isValidCoding
bool isValidCoding
Flag to indicate the decoding is valid.
Definition: cryptlib.h:301
CryptoMaterial::InvalidMaterial
Exception thrown when invalid crypto material is detected.
Definition: cryptlib.h:2376
CryptoMaterial::Save
virtual void Save(BufferedTransformation &bt) const
Saves a key to a BufferedTransformation.
Definition: cryptlib.h:2422
MessageAuthenticationCode
Interface for message authentication codes.
Definition: cryptlib.h:1298
StreamTransformation
Interface for the data processing portion of stream ciphers.
Definition: cryptlib.h:945
BERDecodeErr
Exception thrown when an ASN.1 BER decoing error is encountered.
Definition: cryptlib.h:3255
Algorithm::AlgorithmProvider
virtual std::string AlgorithmProvider() const
Retrieve the provider of this algorithm.
Definition: cryptlib.h:636
Exception::Exception
Exception(ErrorType errorType, const std::string &s)
Construct a new Exception.
Definition: cryptlib.h:183
BufferedTransformation::CreatePutSpace
virtual byte * CreatePutSpace(size_t &size)
Request space which can be written into by the caller.
Definition: cryptlib.h:1703
Waitable::GetMaxWaitObjectCount
virtual unsigned int GetMaxWaitObjectCount() const =0
Maximum number of wait objects that this object can return.
BufferedTransformation::NumberOfMessageSeries
virtual unsigned int NumberOfMessageSeries() const
Provides the number of messages in a series.
Definition: cryptlib.h:2094
NameValuePairs::GetIntValueWithDefault
CRYPTOPP_DLL int GetIntValueWithDefault(const char *name, int defaultValue) const
Get a named value with type int, with default.
Definition: cryptlib.h:424
HashTransformation::Restart
virtual void Restart()
Restart the hash.
Definition: cryptlib.h:1147
BufferedTransformation::IsolatedMessageSeriesEnd
virtual bool IsolatedMessageSeriesEnd(bool blocking)
Marks the end of a series of messages, without signal propagation.
Definition: cryptlib.h:1815
Weak
Namespace containing weak and wounded algorithms.
Definition: arc4.cpp:14
PK_SignatureScheme::SignatureUpfront
virtual bool SignatureUpfront() const
Determines whether the signature must be input before the message.
Definition: cryptlib.h:2831
SimpleKeyingInterface::CanUseRandomIVs
bool CanUseRandomIVs() const
Determines if the object can use random IVs.
Definition: cryptlib.h:744
SimpleKeyingInterface::SetKeyWithIV
void SetKeyWithIV(const byte *key, size_t length, const byte *iv)
Sets or reset the key of this object.
Definition: cryptlib.h:708
HashTransformation::CreateUpdateSpace
virtual byte * CreateUpdateSpace(size_t &size)
Request space which can be written into by the caller.
Definition: cryptlib.h:1135
LWORD_MAX
const lword LWORD_MAX
Large word type max value.
Definition: config_int.h:164
NameValuePairs
Interface for retrieving values given their names.
Definition: cryptlib.h:321
word16
unsigned short word16
16-bit unsigned datatype
Definition: config_int.h:59
NameValuePairs::GetThisPointer
bool GetThisPointer(T *&ptr) const
Get a pointer to this object.
Definition: cryptlib.h:366
Integer
Multiple precision integer with arithmetic operations.
Definition: integer.h:49
NotImplemented::NotImplemented
NotImplemented(const std::string &s)
Construct an NotImplemented.
Definition: cryptlib.h:238
SimpleKeyingInterface::RANDOM_IV
@ RANDOM_IV
The IV must be random and possibly predictable.
Definition: cryptlib.h:723
CannotFlush
Flush(true) was called but it can't completely flush its buffers.
Definition: cryptlib.h:242
PasswordBasedKeyDerivationFunction
Interface for password based key derivation functions.
Definition: cryptlib.h:1569
PK_SignatureScheme::MaxSignatureLength
virtual size_t MaxSignatureLength(size_t recoverablePartLength=0) const
Provides the maximum signature length produced given the length of the recoverable message part.
Definition: cryptlib.h:2800
AuthenticatedSymmetricCipher
Interface for authenticated encryption modes of operation.
Definition: cryptlib.h:1320
HashTransformation::Final
virtual void Final(byte *digest)
Computes the hash of the current message.
Definition: cryptlib.h:1142
InvalidCiphertext
A decryption filter encountered invalid ciphertext.
Definition: cryptlib.h:222