Crypto++ 8.0 Free C++ class library of cryptographic schemes

default.h
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1 // default.h - originally written and placed in the public domain by Wei Dai
2
3 /// \file default.h
4 /// \brief Classes for DefaultEncryptor, DefaultDecryptor, DefaultEncryptorWithMAC and DefaultDecryptorWithMAC
5
6 #ifndef CRYPTOPP_DEFAULT_H
7 #define CRYPTOPP_DEFAULT_H
8
9 #include "sha.h"
10 #include "hmac.h"
11 #include "aes.h"
12 #include "des.h"
13 #include "modes.h"
14 #include "filters.h"
15 #include "smartptr.h"
16
17 NAMESPACE_BEGIN(CryptoPP)
18
19 /// \brief Legacy block cipher for LegacyEncryptor, LegacyDecryptor, LegacyEncryptorWithMAC and LegacyDecryptorWithMAC
20 typedef DES_EDE2 LegacyBlockCipher;
21 /// \brief Legacy hash for use with LegacyEncryptorWithMAC and LegacyDecryptorWithMAC
22 typedef SHA1 LegacyHashModule;
23 /// \brief Legacy HMAC for use withLegacyEncryptorWithMAC and LegacyDecryptorWithMAC
24 typedef HMAC<LegacyHashModule> LegacyMAC;
25
26 /// \brief Default block cipher for DefaultEncryptor, DefaultDecryptor, DefaultEncryptorWithMAC and DefaultDecryptorWithMAC
27 typedef AES DefaultBlockCipher;
28 /// \brief Default hash for use with DefaultEncryptorWithMAC and DefaultDecryptorWithMAC
29 typedef SHA256 DefaultHashModule;
30 /// \brief Default HMAC for use withDefaultEncryptorWithMAC and DefaultDecryptorWithMAC
31 typedef HMAC<DefaultHashModule> DefaultMAC;
32
33 /// \brief Exception thrown when LegacyDecryptorWithMAC or DefaultDecryptorWithMAC decryption error is encountered
34 class DataDecryptorErr : public Exception
35 {
36 public:
37 DataDecryptorErr(const std::string &s)
38 : Exception(DATA_INTEGRITY_CHECK_FAILED, s) {}
39 };
40
41 /// \brief Exception thrown when a bad key is encountered in DefaultDecryptorWithMAC and LegacyDecryptorWithMAC
42 class KeyBadErr : public DataDecryptorErr
43 {
44 public: KeyBadErr()
45 : DataDecryptorErr("DataDecryptor: cannot decrypt message with this passphrase") {}
46 };
47
48 /// \brief Exception thrown when an incorrect MAC is encountered in DefaultDecryptorWithMAC and LegacyDecryptorWithMAC
49 class MACBadErr : public DataDecryptorErr
50 {
51 public: MACBadErr()
52 : DataDecryptorErr("DataDecryptorWithMAC: MAC check failed") {}
53 };
54
55 /// \brief Algorithm information for password-based encryptors and decryptors
56 template <unsigned int BlockSize, unsigned int KeyLength, unsigned int DigestSize, unsigned int SaltSize, unsigned int Iterations>
57 struct DataParametersInfo
58 {
59 CRYPTOPP_CONSTANT(BLOCKSIZE = BlockSize)
60 CRYPTOPP_CONSTANT(KEYLENGTH = KeyLength)
61 CRYPTOPP_CONSTANT(SALTLENGTH = SaltSize)
62 CRYPTOPP_CONSTANT(DIGESTSIZE = DigestSize)
63 CRYPTOPP_CONSTANT(ITERATIONS = Iterations)
64 };
65
66 typedef DataParametersInfo<LegacyBlockCipher::BLOCKSIZE, LegacyBlockCipher::DEFAULT_KEYLENGTH, LegacyHashModule::DIGESTSIZE, 8, 200> LegacyParametersInfo;
67 typedef DataParametersInfo<DefaultBlockCipher::BLOCKSIZE, DefaultBlockCipher::DEFAULT_KEYLENGTH, DefaultHashModule::DIGESTSIZE, 8, 2500> DefaultParametersInfo;
68
69 /// \brief Password-based Encryptor
70 /// \tparam BC BlockCipher based class used for encryption
71 /// \tparam H HashTransformation based class used for mashing
72 /// \tparam Info Constants used by the algorithms
73 /// \details Crypto++ 5.6.5 and earlier used the legacy algorithms, including DES_EDE2 and SHA1.
74 /// Crypto++ 5.7 switched to AES and SHA256.
75 /// \sa DefaultEncryptor, DefaultDecryptor, LegacyEncryptor, LegacyDecryptor
76 /// \since Crypto++ 2.0
77 template <class BC, class H, class Info>
78 class DataEncryptor : public ProxyFilter, public Info
79 {
80 public:
81 CRYPTOPP_CONSTANT(BLOCKSIZE = Info::BLOCKSIZE)
82 CRYPTOPP_CONSTANT(KEYLENGTH = Info::KEYLENGTH)
83 CRYPTOPP_CONSTANT(SALTLENGTH = Info::SALTLENGTH)
84 CRYPTOPP_CONSTANT(DIGESTSIZE = Info::DIGESTSIZE)
85 CRYPTOPP_CONSTANT(ITERATIONS = Info::ITERATIONS)
86
87 /// \brief Construct a DataEncryptor
88 /// \param passphrase a C-String password
89 /// \param attachment a BufferedTransformation to attach to this object
90 DataEncryptor(const char *passphrase, BufferedTransformation *attachment = NULLPTR);
91
92 /// \brief Construct a DataEncryptor
93 /// \param passphrase a byte string password
94 /// \param passphraseLength the length of the byte string password
95 /// \param attachment a BufferedTransformation to attach to this object
96 DataEncryptor(const byte *passphrase, size_t passphraseLength, BufferedTransformation *attachment = NULLPTR);
97
98 protected:
99 void FirstPut(const byte *);
100 void LastPut(const byte *inString, size_t length);
101
102 private:
103 SecByteBlock m_passphrase;
104 typename CBC_Mode<BC>::Encryption m_cipher;
105 };
106
107 /// \brief Password-based Decryptor
108 /// \tparam BC BlockCipher based class used for encryption
109 /// \tparam H HashTransformation based class used for mashing
110 /// \tparam Info Constants used by the algorithms
111 /// \details Crypto++ 5.6.5 and earlier used the legacy algorithms, including DES_EDE2 and SHA1.
112 /// Crypto++ 5.7 switched to AES and SHA256.
113 /// \sa DefaultEncryptor, DefaultDecryptor, LegacyEncryptor, LegacyDecryptor
114 /// \since Crypto++ 2.0
115 template <class BC, class H, class Info>
116 class DataDecryptor : public ProxyFilter, public Info
117 {
118 public:
119 CRYPTOPP_CONSTANT(BLOCKSIZE = Info::BLOCKSIZE)
120 CRYPTOPP_CONSTANT(KEYLENGTH = Info::KEYLENGTH)
121 CRYPTOPP_CONSTANT(SALTLENGTH = Info::SALTLENGTH)
122 CRYPTOPP_CONSTANT(DIGESTSIZE = Info::DIGESTSIZE)
123 CRYPTOPP_CONSTANT(ITERATIONS = Info::ITERATIONS)
124
125 /// \brief Constructs a DataDecryptor
126 /// \param passphrase a C-String password
127 /// \param attachment a BufferedTransformation to attach to this object
128 /// \param throwException a flag specifiying whether an Exception should be thrown on error
129 DataDecryptor(const char *passphrase, BufferedTransformation *attachment = NULLPTR, bool throwException=true);
130
131 /// \brief Constructs a DataDecryptor
132 /// \param passphrase a byte string password
133 /// \param passphraseLength the length of the byte string password
134 /// \param attachment a BufferedTransformation to attach to this object
135 /// \param throwException a flag specifiying whether an Exception should be thrown on error
136 DataDecryptor(const byte *passphrase, size_t passphraseLength, BufferedTransformation *attachment = NULLPTR, bool throwException=true);
137
138 enum State {WAITING_FOR_KEYCHECK, KEY_GOOD, KEY_BAD};
139 State CurrentState() const {return m_state;}
140
141 protected:
142 void FirstPut(const byte *inString);
143 void LastPut(const byte *inString, size_t length);
144
145 State m_state;
146
147 private:
148 void CheckKey(const byte *salt, const byte *keyCheck);
149
150 SecByteBlock m_passphrase;
151 typename CBC_Mode<BC>::Decryption m_cipher;
152 member_ptr<FilterWithBufferedInput> m_decryptor;
153 bool m_throwException;
154
155 };
156
157 /// \brief Password-based encryptor with MAC
158 /// \tparam BC BlockCipher based class used for encryption
159 /// \tparam H HashTransformation based class used for mashing
160 /// \tparam MAC HashTransformation based class used for authentication
161 /// \tparam Info Constants used by the algorithms
162 /// \details DataEncryptorWithMAC uses a non-standard mashup function called Mash() to derive key
163 /// bits from the password.
164 /// \details The purpose of the function Mash() is to take an arbitrary length input string and
165 /// *deterministically* produce an arbitrary length output string such that (1) it looks random,
166 /// (2) no information about the input is deducible from it, and (3) it contains as much entropy
167 /// as it can hold, or the amount of entropy in the input string, whichever is smaller.
168 /// \details Crypto++ 5.6.5 and earlier used the legacy algorithms, including DES_EDE2 and SHA1.
169 /// Crypto++ 5.7 switched to AES and SHA256.
170 /// \sa DefaultEncryptorWithMAC, DefaultDecryptorWithMAC, LegacyDecryptorWithMAC, LegacyEncryptorWithMAC
171 /// \since Crypto++ 2.0
172 template <class BC, class H, class MAC, class Info>
173 class DataEncryptorWithMAC : public ProxyFilter
174 {
175 public:
176 CRYPTOPP_CONSTANT(BLOCKSIZE = Info::BLOCKSIZE)
177 CRYPTOPP_CONSTANT(KEYLENGTH = Info::KEYLENGTH)
178 CRYPTOPP_CONSTANT(SALTLENGTH = Info::SALTLENGTH)
179 CRYPTOPP_CONSTANT(DIGESTSIZE = Info::DIGESTSIZE)
180 CRYPTOPP_CONSTANT(ITERATIONS = Info::ITERATIONS)
181
182 /// \brief Constructs a DataEncryptorWithMAC
183 /// \param passphrase a C-String password
184 /// \param attachment a BufferedTransformation to attach to this object
185 DataEncryptorWithMAC(const char *passphrase, BufferedTransformation *attachment = NULLPTR);
186
187 /// \brief Constructs a DataEncryptorWithMAC
188 /// \param passphrase a byte string password
189 /// \param passphraseLength the length of the byte string password
190 /// \param attachment a BufferedTransformation to attach to this object
191 DataEncryptorWithMAC(const byte *passphrase, size_t passphraseLength, BufferedTransformation *attachment = NULLPTR);
192
193 protected:
194 void FirstPut(const byte *inString) {CRYPTOPP_UNUSED(inString);}
195 void LastPut(const byte *inString, size_t length);
196
197 private:
198 member_ptr<MAC> m_mac;
199
200 };
201
202 /// \brief Password-based decryptor with MAC
203 /// \tparam BC BlockCipher based class used for encryption
204 /// \tparam H HashTransformation based class used for mashing
205 /// \tparam MAC HashTransformation based class used for authentication
206 /// \tparam Info Constants used by the algorithms
207 /// \details DataDecryptorWithMAC uses a non-standard mashup function called Mash() to derive key
208 /// bits from the password.
209 /// \details The purpose of the function Mash() is to take an arbitrary length input string and
210 /// *deterministically* produce an arbitrary length output string such that (1) it looks random,
211 /// (2) no information about the input is deducible from it, and (3) it contains as much entropy
212 /// as it can hold, or the amount of entropy in the input string, whichever is smaller.
213 /// \details Crypto++ 5.6.5 and earlier used the legacy algorithms, including DES_EDE2 and SHA1.
214 /// Crypto++ 5.7 switched to AES and SHA256.
215 /// \sa DefaultEncryptorWithMAC, DefaultDecryptorWithMAC, LegacyDecryptorWithMAC, LegacyEncryptorWithMAC
216 /// \since Crypto++ 2.0
217 template <class BC, class H, class MAC, class Info>
218 class DataDecryptorWithMAC : public ProxyFilter
219 {
220 public:
221 CRYPTOPP_CONSTANT(BLOCKSIZE = Info::BLOCKSIZE)
222 CRYPTOPP_CONSTANT(KEYLENGTH = Info::KEYLENGTH)
223 CRYPTOPP_CONSTANT(SALTLENGTH = Info::SALTLENGTH)
224 CRYPTOPP_CONSTANT(DIGESTSIZE = Info::DIGESTSIZE)
225 CRYPTOPP_CONSTANT(ITERATIONS = Info::ITERATIONS)
226
227 /// \brief Constructs a DataDecryptor
228 /// \param passphrase a C-String password
229 /// \param attachment a BufferedTransformation to attach to this object
230 /// \param throwException a flag specifiying whether an Exception should be thrown on error
231 DataDecryptorWithMAC(const char *passphrase, BufferedTransformation *attachment = NULLPTR, bool throwException=true);
232
233 /// \brief Constructs a DataDecryptor
234 /// \param passphrase a byte string password
235 /// \param passphraseLength the length of the byte string password
236 /// \param attachment a BufferedTransformation to attach to this object
237 /// \param throwException a flag specifiying whether an Exception should be thrown on error
238 DataDecryptorWithMAC(const byte *passphrase, size_t passphraseLength, BufferedTransformation *attachment = NULLPTR, bool throwException=true);
239
240 typename DataDecryptor<BC,H,Info>::State CurrentState() const;
241 bool CheckLastMAC() const;
242
243 protected:
244 void FirstPut(const byte *inString) {CRYPTOPP_UNUSED(inString);}
245 void LastPut(const byte *inString, size_t length);
246
247 private:
248 member_ptr<MAC> m_mac;
249 HashVerificationFilter *m_hashVerifier;
250 bool m_throwException;
251 };
252
253 #if defined(CRYPTOPP_DOXYGEN_PROCESSING)
254 /// \brief Password-based encryptor (deprecated)
255 /// \details Crypto++ 5.6.5 and earlier used the legacy algorithms, including DES_EDE2 and SHA1.
256 /// Crypto++ 5.7 switched to AES and SHA256. The updated algorithms are available with the
257 /// <tt>Default*</tt> classes, and the old algorithms are available with the <tt>Legacy*</tt> classes.
258 struct LegacyEncryptor : public DataEncryptor<LegacyBlockCipher,LegacyHashModule,LegacyParametersInfo> {};
259 /// \brief Password-based decryptor (deprecated)
260 /// \details Crypto++ 5.6.5 and earlier used the legacy algorithms, including DES_EDE2 and SHA1.
261 /// Crypto++ 5.7 switched to AES and SHA256. The updated algorithms are available with the
262 /// <tt>Default*</tt> classes, and the old algorithms are available with the <tt>Legacy*</tt> classes.
263 struct LegacyDecryptor : public DataDecryptor<LegacyBlockCipher,LegacyHashModule,LegacyParametersInfo> {};
264 /// \brief Password-based encryptor
265 /// \details Crypto++ 5.6.5 and earlier used the legacy algorithms, including DES_EDE2 and SHA1.
266 /// Crypto++ 5.7 switched to AES and SHA256. The updated algorithms are available with the
267 /// <tt>Default*</tt> classes, and the old algorithms are available with the <tt>Legacy*</tt> classes.
268 struct DefaultEncryptor : public DataEncryptor<DefaultBlockCipher,DefaultHashModule,DefaultParametersInfo> {};
269 /// \brief Password-based decryptor
270 /// \details Crypto++ 5.6.5 and earlier used the legacy algorithms, including DES_EDE2 and SHA1.
271 /// Crypto++ 5.7 switched to AES and SHA256. The updated algorithms are available with the
272 /// <tt>Default*</tt> classes, and the old algorithms are available with the <tt>Legacy*</tt> classes.
273 struct DefaultDecryptor : public DataDecryptor<DefaultBlockCipher,DefaultHashModule,DefaultParametersInfo> {};
274 /// \brief Password-based encryptor with MAC (deprecated)
275 /// \details Crypto++ 5.6.5 and earlier used the legacy algorithms, including DES_EDE2 and SHA1.
276 /// Crypto++ 5.7 switched to AES and SHA256. The updated algorithms are available with the
277 /// <tt>Default*</tt> classes, and the old algorithms are available with the <tt>Legacy*</tt> classes.
278 struct LegacyEncryptorWithMAC : public DataEncryptorWithMAC<LegacyBlockCipher,LegacyHashModule,LegacyMAC,LegacyParametersInfo> {};
279 /// \brief Password-based decryptor with MAC (deprecated)
280 /// \details Crypto++ 5.6.5 and earlier used the legacy algorithms, including DES_EDE2 and SHA1.
281 /// Crypto++ 5.7 switched to AES and SHA256. The updated algorithms are available with the
282 /// <tt>Default*</tt> classes, and the old algorithms are available with the <tt>Legacy*</tt> classes.
283 struct LegacyDecryptorWithMAC : public DataDecryptorWithMAC<LegacyBlockCipher,LegacyHashModule,LegacyMAC,LegacyParametersInfo> {};
284 /// \brief Password-based encryptor with MAC
285 /// \details Crypto++ 5.6.5 and earlier used the legacy algorithms, including DES_EDE2 and SHA1.
286 /// Crypto++ 5.7 switched to AES and SHA256. The updated algorithms are available with the
287 /// <tt>Default*</tt> classes, and the old algorithms are available with the <tt>Legacy*</tt> classes.
288 struct DefaultEncryptorWithMAC : public DataEncryptorWithMAC<DefaultBlockCipher,DefaultHashModule,DefaultMAC,DefaultParametersInfo> {};
289 /// \brief Password-based decryptor with MAC
290 /// \details Crypto++ 5.6.5 and earlier used the legacy algorithms, including DES_EDE2 and SHA1.
291 /// Crypto++ 5.7 switched to AES and SHA256. The updated algorithms are available with the
292 /// <tt>Default*</tt> classes, and the old algorithms are available with the <tt>Legacy*</tt> classes.
293 struct DefaultDecryptorWithMAC : public DataDecryptorWithMAC<DefaultBlockCipher,DefaultHashModule,DefaultMAC,DefaultParametersInfo> {};
294 #else
295 typedef DataEncryptor<LegacyBlockCipher,LegacyHashModule,LegacyParametersInfo> LegacyEncryptor;
296 typedef DataDecryptor<LegacyBlockCipher,LegacyHashModule,LegacyParametersInfo> LegacyDecryptor;
297
298 typedef DataEncryptor<DefaultBlockCipher,DefaultHashModule,DefaultParametersInfo> DefaultEncryptor;
299 typedef DataDecryptor<DefaultBlockCipher,DefaultHashModule,DefaultParametersInfo> DefaultDecryptor;
300
301 typedef DataEncryptorWithMAC<LegacyBlockCipher,LegacyHashModule,LegacyMAC,LegacyParametersInfo> LegacyEncryptorWithMAC;
302 typedef DataDecryptorWithMAC<LegacyBlockCipher,LegacyHashModule,LegacyMAC,LegacyParametersInfo> LegacyDecryptorWithMAC;
303
304 typedef DataEncryptorWithMAC<DefaultBlockCipher,DefaultHashModule,DefaultMAC,DefaultParametersInfo> DefaultEncryptorWithMAC;
305 typedef DataDecryptorWithMAC<DefaultBlockCipher,DefaultHashModule,DefaultMAC,DefaultParametersInfo> DefaultDecryptorWithMAC;
306 #endif
307
308 NAMESPACE_END
309
310 #endif
Exception
Base class for all exceptions thrown by the library.
Definition: cryptlib.h:158
Name::DigestSize
const char * DigestSize()
int, in bytes
Definition: argnames.h:79
KeyBadErr
Exception thrown when a bad key is encountered in DefaultDecryptorWithMAC and LegacyDecryptorWithMAC...
Definition: default.h:42
ProxyFilter
Base class for Filter classes that are proxies for a chain of other filters.
Definition: filters.h:976
SHA256
SHA-256 message digest.
Definition: sha.h:64
modes.h
Classes for block cipher modes of operation.
DataEncryptor
Password-based Encryptor.
Definition: default.h:78
LegacyDecryptor
Password-based decryptor (deprecated)
Definition: default.h:263
DataDecryptor
Password-based Decryptor.
Definition: default.h:116
smartptr.h
Classes for automatic resource management.
LegacyEncryptorWithMAC
Password-based encryptor with MAC (deprecated)
Definition: default.h:278
SecByteBlock
SecBlock<byte> typedef.
Definition: secblock.h:1058
BufferedTransformation
Interface for buffered transformations.
Definition: cryptlib.h:1598
LegacyDecryptorWithMAC
Password-based decryptor with MAC (deprecated)
Definition: default.h:283
member_ptr< FilterWithBufferedInput >
DataEncryptor::DataEncryptor
DataEncryptor(const char *passphrase, BufferedTransformation *attachment=NULL)
Construct a DataEncryptor.
Definition: default.cpp:85
LegacyEncryptor
Password-based encryptor (deprecated)
Definition: default.h:258
hmac.h
Classes for HMAC message authentication codes.
HashVerificationFilter
Filter wrapper for HashTransformation.
Definition: filters.h:579
DataEncryptorWithMAC
Password-based encryptor with MAC.
Definition: default.h:173
DefaultEncryptor
Password-based encryptor.
Definition: default.h:268
DataEncryptorWithMAC::DataEncryptorWithMAC
DataEncryptorWithMAC(const char *passphrase, BufferedTransformation *attachment=NULL)
Constructs a DataEncryptorWithMAC.
Definition: default.cpp:232
aes.h
Class file for the AES cipher (Rijndael)
DES_EDE2
2-key TripleDES block cipher
Definition: des.h:72
SHA1
SHA-1 message digest.
Definition: sha.h:26
DataDecryptorErr
Exception thrown when LegacyDecryptorWithMAC or DefaultDecryptorWithMAC decryption error is encounter...
Definition: default.h:34
AES
AES block cipher (Rijndael)
Definition: aes.h:23
DataParametersInfo
Algorithm information for password-based encryptors and decryptors.
Definition: default.h:57
Name::BlockSize
const char * BlockSize()
int, in bytes
Definition: argnames.h:27
des.h
Classes for DES, 2-key Triple-DES, 3-key Triple-DES and DESX.
sha.h
Classes for SHA-1 and SHA-2 family of message digests.
filters.h
Implementation of BufferedTransformation&#39;s attachment interface.
DefaultDecryptor
Password-based decryptor.
Definition: default.h:273
HMAC
HMAC.
Definition: hmac.h:52
DataDecryptor::DataDecryptor
DataDecryptor(const char *passphrase, BufferedTransformation *attachment=NULL, bool throwException=true)
Constructs a DataDecryptor.
Definition: default.cpp:142
DataDecryptorWithMAC::DataDecryptorWithMAC
DataDecryptorWithMAC(const char *passphrase, BufferedTransformation *attachment=NULL, bool throwException=true)
Constructs a DataDecryptor.
Definition: default.cpp:257
DataDecryptorWithMAC
Password-based decryptor with MAC.
Definition: default.h:218
CryptoPP
Crypto++ library namespace.
DefaultDecryptorWithMAC
Password-based decryptor with MAC.
Definition: default.h:293
Name::SaltSize
const char * SaltSize()
int, in bytes
Definition: argnames.h:89
DefaultEncryptorWithMAC
Password-based encryptor with MAC.
Definition: default.h:288
typedef
MACBadErr
Exception thrown when an incorrect MAC is encountered in DefaultDecryptorWithMAC and LegacyDecryptorW...
Definition: default.h:49
CBC_Mode
CBC block cipher mode of operation.
Definition: modes.h:554