Crypto++ 7.0 Free C++ class library of cryptographic schemes

simple.h
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1 // simple.h - originally written and placed in the public domain by Wei Dai
2
3 /// \file simple.h
4 /// \brief Classes providing basic library services.
5
6 #ifndef CRYPTOPP_SIMPLE_H
7 #define CRYPTOPP_SIMPLE_H
8
9 #include "config.h"
10
11 #if CRYPTOPP_MSC_VERSION
12 # pragma warning(push)
13 # pragma warning(disable: 4127 4189)
14 #endif
15
16 #include "cryptlib.h"
17 #include "misc.h"
18
19 NAMESPACE_BEGIN(CryptoPP)
20
21 /// \brief Base class for identifying alogorithm
22 /// \tparam BASE base class from which to derive
23 /// \tparam DERIVED class which to clone
24 template <class DERIVED, class BASE>
25 class CRYPTOPP_NO_VTABLE ClonableImpl : public BASE
26 {
27 public:
28 Clonable * Clone() const {return new DERIVED(*static_cast<const DERIVED *>(this));}
29 };
30
31 /// \brief Base class information
32 /// \tparam BASE an Algorithm derived class
33 /// \tparam ALGORITHM_INFO an Algorithm derived class
34 /// \details AlgorithmImpl provides StaticAlgorithmName from the template parameter BASE
35 template <class BASE, class ALGORITHM_INFO=BASE>
36 class CRYPTOPP_NO_VTABLE AlgorithmImpl : public BASE
37 {
38 public:
39 /// \brief The algorithm name
40 /// \returns the algorithm name
41 /// \details StaticAlgorithmName returns the algorithm's name as a static member function.
42 /// The name is taken from information provided by BASE.
43 static std::string CRYPTOPP_API StaticAlgorithmName() {return ALGORITHM_INFO::StaticAlgorithmName();}
44 /// \brief The algorithm name
45 /// \returns the algorithm name
46 /// \details AlgorithmName returns the algorithm's name as a member function.
47 /// The name is is acquired by calling StaticAlgorithmName.
48 std::string AlgorithmName() const {return ALGORITHM_INFO::StaticAlgorithmName();}
49 };
50
51 /// \brief Exception thrown when an invalid key length is encountered
52 class CRYPTOPP_DLL InvalidKeyLength : public InvalidArgument
53 {
54 public:
55 explicit InvalidKeyLength(const std::string &algorithm, size_t length) : InvalidArgument(algorithm + ": " + IntToString(length) + " is not a valid key length") {}
56 };
57
58 /// \brief Exception thrown when an invalid number of rounds is encountered
59 class CRYPTOPP_DLL InvalidRounds : public InvalidArgument
60 {
61 public:
62 explicit InvalidRounds(const std::string &algorithm, unsigned int rounds) : InvalidArgument(algorithm + ": " + IntToString(rounds) + " is not a valid number of rounds") {}
63 };
64
65 /// \brief Exception thrown when an invalid block size is encountered
66 class CRYPTOPP_DLL InvalidBlockSize : public InvalidArgument
67 {
68 public:
69 explicit InvalidBlockSize(const std::string &algorithm, size_t length) : InvalidArgument(algorithm + ": " + IntToString(length) + " is not a valid block size") {}
70 };
71
72 /// \brief Exception thrown when an invalid derived key length is encountered
73 class CRYPTOPP_DLL InvalidDerivedLength : public InvalidArgument
74 {
75 public:
76 explicit InvalidDerivedLength(const std::string &algorithm, size_t length) : InvalidArgument(algorithm + ": " + IntToString(length) + " is not a valid derived key length") {}
77 };
78
79 /// \brief Exception thrown when an invalid personalization string length is encountered
80 class CRYPTOPP_DLL InvalidPersonalizationLength : public InvalidArgument
81 {
82 public:
83 explicit InvalidPersonalizationLength(const std::string &algorithm, size_t length) : InvalidArgument(algorithm + ": " + IntToString(length) + " is not a valid salt length") {}
84 };
85
86 /// \brief Exception thrown when an invalid salt length is encountered
87 class CRYPTOPP_DLL InvalidSaltLength : public InvalidArgument
88 {
89 public:
90 explicit InvalidSaltLength(const std::string &algorithm, size_t length) : InvalidArgument(algorithm + ": " + IntToString(length) + " is not a valid salt length") {}
91 };
92
93 // *****************************
94
95 /// \brief Base class for bufferless filters
96 /// \tparam T the class or type
97 template <class T>
98 class CRYPTOPP_NO_VTABLE Bufferless : public T
99 {
100 public:
101 bool IsolatedFlush(bool hardFlush, bool blocking)
102 {CRYPTOPP_UNUSED(hardFlush); CRYPTOPP_UNUSED(blocking); return false;}
103 };
104
105 /// \brief Base class for unflushable filters
106 /// \tparam T the class or type
107 template <class T>
108 class CRYPTOPP_NO_VTABLE Unflushable : public T
109 {
110 public:
111 bool Flush(bool completeFlush, int propagation=-1, bool blocking=true)
112 {return ChannelFlush(DEFAULT_CHANNEL, completeFlush, propagation, blocking);}
113 bool IsolatedFlush(bool hardFlush, bool blocking)
114 {CRYPTOPP_UNUSED(hardFlush); CRYPTOPP_UNUSED(blocking); CRYPTOPP_ASSERT(false); return false;}
115 bool ChannelFlush(const std::string &channel, bool hardFlush, int propagation=-1, bool blocking=true)
116 {
117 if (hardFlush && !InputBufferIsEmpty())
118 throw CannotFlush("Unflushable<T>: this object has buffered input that cannot be flushed");
119 else
120 {
121 BufferedTransformation *attached = this->AttachedTransformation();
122 return attached && propagation ? attached->ChannelFlush(channel, hardFlush, propagation-1, blocking) : false;
123 }
124 }
125
126 protected:
127 virtual bool InputBufferIsEmpty() const {return false;}
128 };
129
130 /// \brief Base class for input rejecting filters
131 /// \tparam T the class or type
132 /// \details T should be a BufferedTransformation derived class
133 template <class T>
134 class CRYPTOPP_NO_VTABLE InputRejecting : public T
135 {
136 public:
137 struct InputRejected : public NotImplemented
138 {InputRejected() : NotImplemented("BufferedTransformation: this object doesn't allow input") {}};
139
140 /// \name INPUT
141 //@{
142
143 /// \brief Input a byte array for processing
144 /// \param inString the byte array to process
145 /// \param length the size of the string, in bytes
146 /// \param messageEnd means how many filters to signal MessageEnd() to, including this one
147 /// \param blocking specifies whether the object should block when processing input
148 /// \throws InputRejected
149 /// \returns the number of bytes that remain in the block (i.e., bytes not processed)
150 /// \details Internally, the default implementation throws InputRejected.
151 size_t Put2(const byte *inString, size_t length, int messageEnd, bool blocking)
152 {CRYPTOPP_UNUSED(inString); CRYPTOPP_UNUSED(length); CRYPTOPP_UNUSED(messageEnd); CRYPTOPP_UNUSED(blocking); throw InputRejected();}
153 //@}
154
155 /// \name SIGNALS
156 //@{
157 bool IsolatedFlush(bool hardFlush, bool blocking)
158 {CRYPTOPP_UNUSED(hardFlush); CRYPTOPP_UNUSED(blocking); return false;}
159 bool IsolatedMessageSeriesEnd(bool blocking)
160 {CRYPTOPP_UNUSED(blocking); throw InputRejected();}
161 size_t ChannelPut2(const std::string &channel, const byte *inString, size_t length, int messageEnd, bool blocking)
162 {CRYPTOPP_UNUSED(channel); CRYPTOPP_UNUSED(inString); CRYPTOPP_UNUSED(length); CRYPTOPP_UNUSED(messageEnd); CRYPTOPP_UNUSED(blocking); throw InputRejected();}
163 bool ChannelMessageSeriesEnd(const std::string& channel, int messageEnd, bool blocking)
164 {CRYPTOPP_UNUSED(channel); CRYPTOPP_UNUSED(messageEnd); CRYPTOPP_UNUSED(blocking); throw InputRejected();}
165 //@}
166 };
167
168 /// \brief Interface for custom flush signals propagation
169 /// \tparam T BufferedTransformation derived class
170 template <class T>
171 class CRYPTOPP_NO_VTABLE CustomFlushPropagation : public T
172 {
173 public:
174 /// \name SIGNALS
175 //@{
176
177 /// \brief Flush buffered input and/or output, with signal propagation
178 /// \param hardFlush is used to indicate whether all data should be flushed
179 /// \param propagation the number of attached transformations the Flush() signal should be passed
180 /// \param blocking specifies whether the object should block when processing input
181 /// \details propagation count includes this object. Setting propagation to <tt>1</tt> means this
182 /// object only. Setting propagation to <tt>-1</tt> means unlimited propagation.
183 /// \note Hard flushes must be used with care. It means try to process and output everything, even if
184 /// there may not be enough data to complete the action. For example, hard flushing a HexDecoder
185 /// would cause an error if you do it after inputing an odd number of hex encoded characters.
186 /// \note For some types of filters, like ZlibDecompressor, hard flushes can only
187 /// be done at "synchronization points". These synchronization points are positions in the data
188 /// stream that are created by hard flushes on the corresponding reverse filters, in this
189 /// example ZlibCompressor. This is useful when zlib compressed data is moved across a
190 /// network in packets and compression state is preserved across packets, as in the SSH2 protocol.
191 virtual bool Flush(bool hardFlush, int propagation=-1, bool blocking=true) =0;
192
193 //@}
194
195 private:
196 bool IsolatedFlush(bool hardFlush, bool blocking)
197 {CRYPTOPP_UNUSED(hardFlush); CRYPTOPP_UNUSED(blocking); CRYPTOPP_ASSERT(false); return false;}
198 };
199
200 /// \brief Interface for custom flush signals
201 /// \tparam T BufferedTransformation derived class
202 template <class T>
203 class CRYPTOPP_NO_VTABLE CustomSignalPropagation : public CustomFlushPropagation<T>
204 {
205 public:
206 /// \brief Initialize or reinitialize this object, with signal propagation
207 /// \param parameters a set of NameValuePairs to initialize or reinitialize this object
208 /// \param propagation the number of attached transformations the Initialize() signal should be passed
209 /// \details Initialize() is used to initialize or reinitialize an object using a variable number of
210 /// arbitrarily typed arguments. The function avoids the need for multiple constructors providing
211 /// all possible combintations of configurable parameters.
212 /// \details propagation count includes this object. Setting propagation to <tt>1</tt> means this
213 /// object only. Setting propagation to <tt>-1</tt> means unlimited propagation.
214 virtual void Initialize(const NameValuePairs &parameters=g_nullNameValuePairs, int propagation=-1) =0;
215
216 private:
217 void IsolatedInitialize(const NameValuePairs &parameters)
218 {CRYPTOPP_UNUSED(parameters); CRYPTOPP_ASSERT(false);}
219 };
220
221 /// \brief Multiple channels support for custom signal processing
222 /// \tparam T the class or type
223 /// \details T should be a BufferedTransformation derived class
224 template <class T>
225 class CRYPTOPP_NO_VTABLE Multichannel : public CustomFlushPropagation<T>
226 {
227 public:
228 bool Flush(bool hardFlush, int propagation=-1, bool blocking=true)
229 {return this->ChannelFlush(DEFAULT_CHANNEL, hardFlush, propagation, blocking);}
230
231 /// \brief Marks the end of a series of messages, with signal propagation
232 /// \param propagation the number of attached transformations the MessageSeriesEnd() signal should be passed
233 /// \param blocking specifies whether the object should block when processing input
234 /// \details Each object that receives the signal will perform its processing, decrement
235 /// propagation, and then pass the signal on to attached transformations if the value is not 0.
236 /// \details propagation count includes this object. Setting propagation to <tt>1</tt> means this
237 /// object only. Setting propagation to <tt>-1</tt> means unlimited propagation.
238 /// \note There should be a MessageEnd() immediately before MessageSeriesEnd().
239 bool MessageSeriesEnd(int propagation=-1, bool blocking=true)
240 {return this->ChannelMessageSeriesEnd(DEFAULT_CHANNEL, propagation, blocking);}
241
242 /// \brief Request space which can be written into by the caller
243 /// \param size the requested size of the buffer
244 /// \details The purpose of this method is to help avoid extra memory allocations.
245 /// \details size is an \a IN and \a OUT parameter and used as a hint. When the call is made,
246 /// size is the requested size of the buffer. When the call returns, size is the size of
247 /// the array returned to the caller.
248 /// \details The base class implementation sets size to 0 and returns NULL.
249 /// \note Some objects, like ArraySink, cannot create a space because its fixed. In the case of
250 /// an ArraySink, the pointer to the array is returned and the size is remaining size.
251 byte * CreatePutSpace(size_t &size)
252 {return this->ChannelCreatePutSpace(DEFAULT_CHANNEL, size);}
253
254 /// \brief Input multiple bytes for processing
255 /// \param inString the byte buffer to process
256 /// \param length the size of the string, in bytes
257 /// \param messageEnd means how many filters to signal MessageEnd() to, including this one
258 /// \param blocking specifies whether the object should block when processing input
259 /// \details Derived classes must implement Put2().
260 size_t Put2(const byte *inString, size_t length, int messageEnd, bool blocking)
261 {return this->ChannelPut2(DEFAULT_CHANNEL, inString, length, messageEnd, blocking);}
262
263 /// \brief Input multiple bytes that may be modified by callee.
264 /// \param inString the byte buffer to process.
265 /// \param length the size of the string, in bytes.
266 /// \param messageEnd means how many filters to signal MessageEnd() to, including this one.
267 /// \param blocking specifies whether the object should block when processing input.
268 /// \details Internally, PutModifiable2() calls Put2().
269 size_t PutModifiable2(byte *inString, size_t length, int messageEnd, bool blocking)
270 {return this->ChannelPutModifiable2(DEFAULT_CHANNEL, inString, length, messageEnd, blocking);}
271
272 // void ChannelMessageSeriesEnd(const std::string &channel, int propagation=-1)
273 // {PropagateMessageSeriesEnd(propagation, channel);}
274 byte * ChannelCreatePutSpace(const std::string &channel, size_t &size)
275 {CRYPTOPP_UNUSED(channel); size = 0; return NULLPTR;}
276 bool ChannelPutModifiable(const std::string &channel, byte *inString, size_t length)
277 {this->ChannelPut(channel, inString, length); return false;}
278
279 virtual size_t ChannelPut2(const std::string &channel, const byte *begin, size_t length, int messageEnd, bool blocking) =0;
280 size_t ChannelPutModifiable2(const std::string &channel, byte *begin, size_t length, int messageEnd, bool blocking)
281 {return ChannelPut2(channel, begin, length, messageEnd, blocking);}
282
283 virtual bool ChannelFlush(const std::string &channel, bool hardFlush, int propagation=-1, bool blocking=true) =0;
284 };
285
286 /// \brief Provides auto signaling support
287 /// \tparam T BufferedTransformation derived class
288 template <class T>
289 class CRYPTOPP_NO_VTABLE AutoSignaling : public T
290 {
291 public:
292 /// \brief Construct an AutoSignaling
293 /// \param propagation the propagation count
294 AutoSignaling(int propagation=-1) : m_autoSignalPropagation(propagation) {}
295
296 void SetAutoSignalPropagation(int propagation)
297 {m_autoSignalPropagation = propagation;}
298 int GetAutoSignalPropagation() const
299 {return m_autoSignalPropagation;}
300
301 private:
302 int m_autoSignalPropagation;
303 };
304
305 /// \brief Acts as a Source for pre-existing, static data
306 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE Store : public AutoSignaling<InputRejecting<BufferedTransformation> >
307 {
308 public:
309 /// \brief Construct a Store
310 Store() : m_messageEnd(false) {}
311
312 void IsolatedInitialize(const NameValuePairs &parameters)
313 {
314 m_messageEnd = false;
315 StoreInitialize(parameters);
316 }
317
318 unsigned int NumberOfMessages() const {return m_messageEnd ? 0 : 1;}
319 bool GetNextMessage();
320 unsigned int CopyMessagesTo(BufferedTransformation &target, unsigned int count=UINT_MAX, const std::string &channel=DEFAULT_CHANNEL) const;
321
322 protected:
323 virtual void StoreInitialize(const NameValuePairs &parameters) =0;
324
325 bool m_messageEnd;
326 };
327
328 /// \brief Implementation of BufferedTransformation's attachment interface
329 /// \details Sink is a cornerstone of the Pipeline trinitiy. Data flows from
330 /// Sources, through Filters, and then terminates in Sinks. The difference
331 /// between a Source and Filter is a Source \a pumps data, while a Filter does
332 /// not. The difference between a Filter and a Sink is a Filter allows an
333 /// attached transformation, while a Sink does not.
334 /// \details A Sink doesnot produce any retrievable output.
335 /// \details See the discussion of BufferedTransformation in cryptlib.h for
336 /// more details.
337 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE Sink : public BufferedTransformation
338 {
339 public:
340 size_t TransferTo2(BufferedTransformation &target, lword &transferBytes, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true)
341 {CRYPTOPP_UNUSED(target); CRYPTOPP_UNUSED(transferBytes); CRYPTOPP_UNUSED(channel); CRYPTOPP_UNUSED(blocking); transferBytes = 0; return 0;}
342 size_t CopyRangeTo2(BufferedTransformation &target, lword &begin, lword end=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true) const
343 {CRYPTOPP_UNUSED(target); CRYPTOPP_UNUSED(begin); CRYPTOPP_UNUSED(end); CRYPTOPP_UNUSED(channel); CRYPTOPP_UNUSED(blocking); return 0;}
344 };
345
346 /// \brief Acts as an input discarding Filter or Sink
347 /// \details The BitBucket discards all input and returns 0 to the caller
348 /// to indicate all data was processed.
349 class CRYPTOPP_DLL BitBucket : public Bufferless<Sink>
350 {
351 public:
352 std::string AlgorithmName() const {return "BitBucket";}
353 void IsolatedInitialize(const NameValuePairs &params)
354 {CRYPTOPP_UNUSED(params);}
355 size_t Put2(const byte *inString, size_t length, int messageEnd, bool blocking)
356 {CRYPTOPP_UNUSED(inString); CRYPTOPP_UNUSED(length); CRYPTOPP_UNUSED(messageEnd); CRYPTOPP_UNUSED(blocking); return 0;}
357 };
358
359 NAMESPACE_END
360
361 #if CRYPTOPP_MSC_VERSION
362 # pragma warning(pop)
363 #endif
364
365 #endif
Multichannel::Put2
size_t Put2(const byte *inString, size_t length, int messageEnd, bool blocking)
Input multiple bytes for processing.
Definition: simple.h:260
InvalidArgument
An invalid argument was detected.
Definition: cryptlib.h:202
misc.h
Utility functions for the Crypto++ library.
Store::Store
Store()
Construct a Store.
Definition: simple.h:310
ClonableImpl
Base class for identifying alogorithm.
Definition: simple.h:25
InvalidKeyLength
Exception thrown when an invalid key length is encountered.
Definition: simple.h:52
AlgorithmImpl::AlgorithmName
std::string AlgorithmName() const
The algorithm name.
Definition: simple.h:48
Store::NumberOfMessages
unsigned int NumberOfMessages() const
Provides the number of meesages processed by this object.
Definition: simple.h:318
CannotFlush
Flush(true) was called but it can&#39;t completely flush its buffers.
Definition: cryptlib.h:230
cryptlib.h
Abstract base classes that provide a uniform interface to this library.
Multichannel::Flush
bool Flush(bool hardFlush, int propagation=-1, bool blocking=true)
Flush buffered input and/or output, with signal propagation.
Definition: simple.h:228
BitBucket::IsolatedInitialize
void IsolatedInitialize(const NameValuePairs &params)
Initialize or reinitialize this object, without signal propagation.
Definition: simple.h:353
config.h
Library configuration file.
Store
Acts as a Source for pre-existing, static data.
Definition: simple.h:306
InputRejecting
Base class for input rejecting filters.
Definition: simple.h:134
BufferedTransformation::ChannelFlush
virtual bool ChannelFlush(const std::string &channel, bool hardFlush, int propagation=-1, bool blocking=true)
Flush buffered input and/or output on a channel.
Definition: cryptlib.cpp:484
BufferedTransformation
Interface for buffered transformations.
Definition: cryptlib.h:1564
Clonable
Interface for cloning objects.
Definition: cryptlib.h:556
CustomFlushPropagation
Interface for custom flush signals propagation.
Definition: simple.h:171
InvalidSaltLength
Exception thrown when an invalid salt length is encountered.
Definition: simple.h:87
Sink::CopyRangeTo2
size_t CopyRangeTo2(BufferedTransformation &target, lword &begin, lword end=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true) const
Copy bytes from this object to another BufferedTransformation.
Definition: simple.h:342
InvalidBlockSize
Exception thrown when an invalid block size is encountered.
Definition: simple.h:66
Store::IsolatedInitialize
void IsolatedInitialize(const NameValuePairs &parameters)
Initialize or reinitialize this object, without signal propagation.
Definition: simple.h:312
InvalidPersonalizationLength
Exception thrown when an invalid personalization string length is encountered.
Definition: simple.h:80
NotImplemented
A method was called which was not implemented.
Definition: cryptlib.h:223
DEFAULT_CHANNEL
const std::string DEFAULT_CHANNEL
Default channel for BufferedTransformation.
Definition: cryptlib.h:482
InvalidRounds
Exception thrown when an invalid number of rounds is encountered.
Definition: simple.h:59
Sink::TransferTo2
size_t TransferTo2(BufferedTransformation &target, lword &transferBytes, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true)
Transfer bytes from this object to another BufferedTransformation.
Definition: simple.h:340
g_nullNameValuePairs
const NameValuePairs & g_nullNameValuePairs
An empty set of name-value pairs.
Definition: cryptlib.h:500
CRYPTOPP_ASSERT
#define CRYPTOPP_ASSERT(exp)
Debugging and diagnostic assertion.
Definition: trap.h:60
InputRejecting::Put2
size_t Put2(const byte *inString, size_t length, int messageEnd, bool blocking)
Input a byte array for processing.
Definition: simple.h:151
Multichannel::PutModifiable2
size_t PutModifiable2(byte *inString, size_t length, int messageEnd, bool blocking)
Input multiple bytes that may be modified by callee.
Definition: simple.h:269
Unflushable
Base class for unflushable filters.
Definition: simple.h:108
BitBucket::Put2
size_t Put2(const byte *inString, size_t length, int messageEnd, bool blocking)
Input multiple bytes for processing.
Definition: simple.h:355
Sink
Implementation of BufferedTransformation&#39;s attachment interface.
Definition: simple.h:337
AutoSignaling
Provides auto signaling support.
Definition: simple.h:289
IntToString
std::string IntToString(T value, unsigned int base=10)
Converts a value to a string.
Definition: misc.h:632
Multichannel::CreatePutSpace
byte * CreatePutSpace(size_t &size)
Request space which can be written into by the caller.
Definition: simple.h:251
Multichannel::MessageSeriesEnd
bool MessageSeriesEnd(int propagation=-1, bool blocking=true)
Marks the end of a series of messages, with signal propagation.
Definition: simple.h:239
InputRejecting::InputRejected
Definition: simple.h:137
InvalidDerivedLength
Exception thrown when an invalid derived key length is encountered.
Definition: simple.h:73
BitBucket
Acts as an input discarding Filter or Sink.
Definition: simple.h:349
CryptoPP
Crypto++ library namespace.
BitBucket::AlgorithmName
std::string AlgorithmName() const
Provides the name of this algorithm.
Definition: simple.h:352
Multichannel
Multiple channels support for custom signal processing.
Definition: simple.h:225
CustomSignalPropagation
Interface for custom flush signals.
Definition: simple.h:203
AutoSignaling::AutoSignaling
AutoSignaling(int propagation=-1)
Construct an AutoSignaling.
Definition: simple.h:294
Bufferless
Base class for bufferless filters.
Definition: simple.h:98
NameValuePairs
Interface for retrieving values given their names.
Definition: cryptlib.h:293
AlgorithmImpl
Base class information.
Definition: simple.h:36