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diff --git a/CryptoPP/cryptlib.h b/CryptoPP/cryptlib.h new file mode 100644 index 000000000..0ad18de80 --- /dev/null +++ b/CryptoPP/cryptlib.h @@ -0,0 +1,1655 @@ +// cryptlib.h - written and placed in the public domain by Wei Dai +/*! \file + This file contains the declarations for the abstract base + classes that provide a uniform interface to this library. +*/ + +/*! \mainpage Crypto++ Library 5.6.1 API Reference +<dl> +<dt>Abstract Base Classes<dd> + cryptlib.h +<dt>Authenticated Encryption<dd> + AuthenticatedSymmetricCipherDocumentation +<dt>Symmetric Ciphers<dd> + SymmetricCipherDocumentation +<dt>Hash Functions<dd> + SHA1, SHA224, SHA256, SHA384, SHA512, Tiger, Whirlpool, RIPEMD160, RIPEMD320, RIPEMD128, RIPEMD256, Weak1::MD2, Weak1::MD4, Weak1::MD5 +<dt>Non-Cryptographic Checksums<dd> + CRC32, Adler32 +<dt>Message Authentication Codes<dd> + VMAC, HMAC, CBC_MAC, CMAC, DMAC, TTMAC, GCM (GMAC) +<dt>Random Number Generators<dd> + NullRNG(), LC_RNG, RandomPool, BlockingRng, NonblockingRng, AutoSeededRandomPool, AutoSeededX917RNG, #DefaultAutoSeededRNG +<dt>Password-based Cryptography<dd> + PasswordBasedKeyDerivationFunction +<dt>Public Key Cryptosystems<dd> + DLIES, ECIES, LUCES, RSAES, RabinES, LUC_IES +<dt>Public Key Signature Schemes<dd> + DSA, GDSA, ECDSA, NR, ECNR, LUCSS, RSASS, RSASS_ISO, RabinSS, RWSS, ESIGN +<dt>Key Agreement<dd> + #DH, DH2, #MQV, ECDH, ECMQV, XTR_DH +<dt>Algebraic Structures<dd> + Integer, PolynomialMod2, PolynomialOver, RingOfPolynomialsOver, + ModularArithmetic, MontgomeryRepresentation, GFP2_ONB, + GF2NP, GF256, GF2_32, EC2N, ECP +<dt>Secret Sharing and Information Dispersal<dd> + SecretSharing, SecretRecovery, InformationDispersal, InformationRecovery +<dt>Compression<dd> + Deflator, Inflator, Gzip, Gunzip, ZlibCompressor, ZlibDecompressor +<dt>Input Source Classes<dd> + StringSource, #ArraySource, FileSource, SocketSource, WindowsPipeSource, RandomNumberSource +<dt>Output Sink Classes<dd> + StringSinkTemplate, ArraySink, FileSink, SocketSink, WindowsPipeSink, RandomNumberSink +<dt>Filter Wrappers<dd> + StreamTransformationFilter, HashFilter, HashVerificationFilter, SignerFilter, SignatureVerificationFilter +<dt>Binary to Text Encoders and Decoders<dd> + HexEncoder, HexDecoder, Base64Encoder, Base64Decoder, Base32Encoder, Base32Decoder +<dt>Wrappers for OS features<dd> + Timer, Socket, WindowsHandle, ThreadLocalStorage, ThreadUserTimer +<dt>FIPS 140 related<dd> + fips140.h +</dl> + +In the DLL version of Crypto++, only the following implementation class are available. +<dl> +<dt>Block Ciphers<dd> + AES, DES_EDE2, DES_EDE3, SKIPJACK +<dt>Cipher Modes (replace template parameter BC with one of the block ciphers above)<dd> + ECB_Mode\<BC\>, CTR_Mode\<BC\>, CBC_Mode\<BC\>, CFB_FIPS_Mode\<BC\>, OFB_Mode\<BC\>, GCM\<AES\> +<dt>Hash Functions<dd> + SHA1, SHA224, SHA256, SHA384, SHA512 +<dt>Public Key Signature Schemes (replace template parameter H with one of the hash functions above)<dd> + RSASS\<PKCS1v15, H\>, RSASS\<PSS, H\>, RSASS_ISO\<H\>, RWSS\<P1363_EMSA2, H\>, DSA, ECDSA\<ECP, H\>, ECDSA\<EC2N, H\> +<dt>Message Authentication Codes (replace template parameter H with one of the hash functions above)<dd> + HMAC\<H\>, CBC_MAC\<DES_EDE2\>, CBC_MAC\<DES_EDE3\>, GCM\<AES\> +<dt>Random Number Generators<dd> + #DefaultAutoSeededRNG (AutoSeededX917RNG\<AES\>) +<dt>Key Agreement<dd> + #DH +<dt>Public Key Cryptosystems<dd> + RSAES\<OAEP\<SHA1\> \> +</dl> + +<p>This reference manual is a work in progress. Some classes are still lacking detailed descriptions. +<p>Click <a href="CryptoPPRef.zip">here</a> to download a zip archive containing this manual. +<p>Thanks to Ryan Phillips for providing the Doxygen configuration file +and getting me started with this manual. +*/ + +#ifndef CRYPTOPP_CRYPTLIB_H +#define CRYPTOPP_CRYPTLIB_H + +#include "config.h" +#include "stdcpp.h" + +NAMESPACE_BEGIN(CryptoPP) + +// forward declarations +class Integer; +class RandomNumberGenerator; +class BufferedTransformation; + +//! used to specify a direction for a cipher to operate in (encrypt or decrypt) +enum CipherDir {ENCRYPTION, DECRYPTION}; + +//! used to represent infinite time +const unsigned long INFINITE_TIME = ULONG_MAX; + +// VC60 workaround: using enums as template parameters causes problems +template <typename ENUM_TYPE, int VALUE> +struct EnumToType +{ + static ENUM_TYPE ToEnum() {return (ENUM_TYPE)VALUE;} +}; + +enum ByteOrder {LITTLE_ENDIAN_ORDER = 0, BIG_ENDIAN_ORDER = 1}; +typedef EnumToType<ByteOrder, LITTLE_ENDIAN_ORDER> LittleEndian; +typedef EnumToType<ByteOrder, BIG_ENDIAN_ORDER> BigEndian; + +//! base class for all exceptions thrown by Crypto++ +class CRYPTOPP_DLL Exception : public std::exception +{ +public: + //! error types + enum ErrorType { + //! a method is not implemented + NOT_IMPLEMENTED, + //! invalid function argument + INVALID_ARGUMENT, + //! BufferedTransformation received a Flush(true) signal but can't flush buffers + CANNOT_FLUSH, + //! data integerity check (such as CRC or MAC) failed + DATA_INTEGRITY_CHECK_FAILED, + //! received input data that doesn't conform to expected format + INVALID_DATA_FORMAT, + //! error reading from input device or writing to output device + IO_ERROR, + //! some error not belong to any of the above categories + OTHER_ERROR + }; + + explicit Exception(ErrorType errorType, const std::string &s) : m_errorType(errorType), m_what(s) {} + virtual ~Exception() throw() {} + const char *what() const throw() {return (m_what.c_str());} + const std::string &GetWhat() const {return m_what;} + void SetWhat(const std::string &s) {m_what = s;} + ErrorType GetErrorType() const {return m_errorType;} + void SetErrorType(ErrorType errorType) {m_errorType = errorType;} + +private: + ErrorType m_errorType; + std::string m_what; +}; + +//! exception thrown when an invalid argument is detected +class CRYPTOPP_DLL InvalidArgument : public Exception +{ +public: + explicit InvalidArgument(const std::string &s) : Exception(INVALID_ARGUMENT, s) {} +}; + +//! exception thrown when input data is received that doesn't conform to expected format +class CRYPTOPP_DLL InvalidDataFormat : public Exception +{ +public: + explicit InvalidDataFormat(const std::string &s) : Exception(INVALID_DATA_FORMAT, s) {} +}; + +//! exception thrown by decryption filters when trying to decrypt an invalid ciphertext +class CRYPTOPP_DLL InvalidCiphertext : public InvalidDataFormat +{ +public: + explicit InvalidCiphertext(const std::string &s) : InvalidDataFormat(s) {} +}; + +//! exception thrown by a class if a non-implemented method is called +class CRYPTOPP_DLL NotImplemented : public Exception +{ +public: + explicit NotImplemented(const std::string &s) : Exception(NOT_IMPLEMENTED, s) {} +}; + +//! exception thrown by a class when Flush(true) is called but it can't completely flush its buffers +class CRYPTOPP_DLL CannotFlush : public Exception +{ +public: + explicit CannotFlush(const std::string &s) : Exception(CANNOT_FLUSH, s) {} +}; + +//! error reported by the operating system +class CRYPTOPP_DLL OS_Error : public Exception +{ +public: + OS_Error(ErrorType errorType, const std::string &s, const std::string& operation, int errorCode) + : Exception(errorType, s), m_operation(operation), m_errorCode(errorCode) {} + ~OS_Error() throw() {} + + // the operating system API that reported the error + const std::string & GetOperation() const {return m_operation;} + // the error code return by the operating system + int GetErrorCode() const {return m_errorCode;} + +protected: + std::string m_operation; + int m_errorCode; +}; + +//! used to return decoding results +struct CRYPTOPP_DLL DecodingResult +{ + explicit DecodingResult() : isValidCoding(false), messageLength(0) {} + explicit DecodingResult(size_t len) : isValidCoding(true), messageLength(len) {} + + bool operator==(const DecodingResult &rhs) const {return isValidCoding == rhs.isValidCoding && messageLength == rhs.messageLength;} + bool operator!=(const DecodingResult &rhs) const {return !operator==(rhs);} + + bool isValidCoding; + size_t messageLength; + +#ifdef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY + operator size_t() const {return isValidCoding ? messageLength : 0;} +#endif +}; + +//! interface for retrieving values given their names +/*! \note This class is used to safely pass a variable number of arbitrarily typed arguments to functions + and to read values from keys and crypto parameters. + \note To obtain an object that implements NameValuePairs for the purpose of parameter + passing, use the MakeParameters() function. + \note To get a value from NameValuePairs, you need to know the name and the type of the value. + Call GetValueNames() on a NameValuePairs object to obtain a list of value names that it supports. + Then look at the Name namespace documentation to see what the type of each value is, or + alternatively, call GetIntValue() with the value name, and if the type is not int, a + ValueTypeMismatch exception will be thrown and you can get the actual type from the exception object. +*/ +class CRYPTOPP_NO_VTABLE NameValuePairs +{ +public: + virtual ~NameValuePairs() {} + + //! exception thrown when trying to retrieve a value using a different type than expected + class CRYPTOPP_DLL ValueTypeMismatch : public InvalidArgument + { + public: + ValueTypeMismatch(const std::string &name, const std::type_info &stored, const std::type_info &retrieving) + : InvalidArgument("NameValuePairs: type mismatch for '" + name + "', stored '" + stored.name() + "', trying to retrieve '" + retrieving.name() + "'") + , m_stored(stored), m_retrieving(retrieving) {} + + const std::type_info & GetStoredTypeInfo() const {return m_stored;} + const std::type_info & GetRetrievingTypeInfo() const {return m_retrieving;} + + private: + const std::type_info &m_stored; + const std::type_info &m_retrieving; + }; + + //! get a copy of this object or a subobject of it + template <class T> + bool GetThisObject(T &object) const + { + return GetValue((std::string("ThisObject:")+typeid(T).name()).c_str(), object); + } + + //! get a pointer to this object, as a pointer to T + template <class T> + bool GetThisPointer(T *&p) const + { + return GetValue((std::string("ThisPointer:")+typeid(T).name()).c_str(), p); + } + + //! get a named value, returns true if the name exists + template <class T> + bool GetValue(const char *name, T &value) const + { + return GetVoidValue(name, typeid(T), &value); + } + + //! get a named value, returns the default if the name doesn't exist + template <class T> + T GetValueWithDefault(const char *name, T defaultValue) const + { + GetValue(name, defaultValue); + return defaultValue; + } + + //! get a list of value names that can be retrieved + CRYPTOPP_DLL std::string GetValueNames() const + {std::string result; GetValue("ValueNames", result); return result;} + + //! get a named value with type int + /*! used to ensure we don't accidentally try to get an unsigned int + or some other type when we mean int (which is the most common case) */ + CRYPTOPP_DLL bool GetIntValue(const char *name, int &value) const + {return GetValue(name, value);} + + //! get a named value with type int, with default + CRYPTOPP_DLL int GetIntValueWithDefault(const char *name, int defaultValue) const + {return GetValueWithDefault(name, defaultValue);} + + //! used by derived classes to check for type mismatch + CRYPTOPP_DLL static void CRYPTOPP_API ThrowIfTypeMismatch(const char *name, const std::type_info &stored, const std::type_info &retrieving) + {if (stored != retrieving) throw ValueTypeMismatch(name, stored, retrieving);} + + template <class T> + void GetRequiredParameter(const char *className, const char *name, T &value) const + { + if (!GetValue(name, value)) + throw InvalidArgument(std::string(className) + ": missing required parameter '" + name + "'"); + } + + CRYPTOPP_DLL void GetRequiredIntParameter(const char *className, const char *name, int &value) const + { + if (!GetIntValue(name, value)) + throw InvalidArgument(std::string(className) + ": missing required parameter '" + name + "'"); + } + + //! to be implemented by derived classes, users should use one of the above functions instead + CRYPTOPP_DLL virtual bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const =0; +}; + +//! namespace containing value name definitions +/*! value names, types and semantics: + + ThisObject:ClassName (ClassName, copy of this object or a subobject) + ThisPointer:ClassName (const ClassName *, pointer to this object or a subobject) +*/ +DOCUMENTED_NAMESPACE_BEGIN(Name) +// more names defined in argnames.h +DOCUMENTED_NAMESPACE_END + +//! empty set of name-value pairs +extern CRYPTOPP_DLL const NameValuePairs &g_nullNameValuePairs; + +// ******************************************************** + +//! interface for cloning objects, this is not implemented by most classes yet +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE Clonable +{ +public: + virtual ~Clonable() {} + //! this is not implemented by most classes yet + virtual Clonable* Clone() const {throw NotImplemented("Clone() is not implemented yet.");} // TODO: make this =0 +}; + +//! interface for all crypto algorithms + +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE Algorithm : public Clonable +{ +public: + /*! When FIPS 140-2 compliance is enabled and checkSelfTestStatus == true, + this constructor throws SelfTestFailure if the self test hasn't been run or fails. */ + Algorithm(bool checkSelfTestStatus = true); + //! returns name of this algorithm, not universally implemented yet + virtual std::string AlgorithmName() const {return "unknown";} +}; + +//! keying interface for crypto algorithms that take byte strings as keys +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE SimpleKeyingInterface +{ +public: + virtual ~SimpleKeyingInterface() {} + + //! returns smallest valid key length in bytes */ + virtual size_t MinKeyLength() const =0; + //! returns largest valid key length in bytes */ + virtual size_t MaxKeyLength() const =0; + //! returns default (recommended) key length in bytes */ + virtual size_t DefaultKeyLength() const =0; + + //! returns the smallest valid key length in bytes that is >= min(n, GetMaxKeyLength()) + virtual size_t GetValidKeyLength(size_t n) const =0; + + //! returns whether n is a valid key length + virtual bool IsValidKeyLength(size_t n) const + {return n == GetValidKeyLength(n);} + + //! set or reset the key of this object + /*! \param params is used to specify Rounds, BlockSize, etc. */ + virtual void SetKey(const byte *key, size_t length, const NameValuePairs ¶ms = g_nullNameValuePairs); + + //! calls SetKey() with an NameValuePairs object that just specifies "Rounds" + void SetKeyWithRounds(const byte *key, size_t length, int rounds); + + //! calls SetKey() with an NameValuePairs object that just specifies "IV" + void SetKeyWithIV(const byte *key, size_t length, const byte *iv, size_t ivLength); + + //! calls SetKey() with an NameValuePairs object that just specifies "IV" + void SetKeyWithIV(const byte *key, size_t length, const byte *iv) + {SetKeyWithIV(key, length, iv, IVSize());} + + enum IV_Requirement {UNIQUE_IV = 0, RANDOM_IV, UNPREDICTABLE_RANDOM_IV, INTERNALLY_GENERATED_IV, NOT_RESYNCHRONIZABLE}; + //! returns the minimal requirement for secure IVs + virtual IV_Requirement IVRequirement() const =0; + + //! returns whether this object can be resynchronized (i.e. supports initialization vectors) + /*! If this function returns true, and no IV is passed to SetKey() and CanUseStructuredIVs()==true, an IV of all 0's will be assumed. */ + bool IsResynchronizable() const {return IVRequirement() < NOT_RESYNCHRONIZABLE;} + //! returns whether this object can use random IVs (in addition to ones returned by GetNextIV) + bool CanUseRandomIVs() const {return IVRequirement() <= UNPREDICTABLE_RANDOM_IV;} + //! returns whether this object can use random but possibly predictable IVs (in addition to ones returned by GetNextIV) + bool CanUsePredictableIVs() const {return IVRequirement() <= RANDOM_IV;} + //! returns whether this object can use structured IVs, for example a counter (in addition to ones returned by GetNextIV) + bool CanUseStructuredIVs() const {return IVRequirement() <= UNIQUE_IV;} + + virtual unsigned int IVSize() const {throw NotImplemented(GetAlgorithm().AlgorithmName() + ": this object doesn't support resynchronization");} + //! returns default length of IVs accepted by this object + unsigned int DefaultIVLength() const {return IVSize();} + //! returns minimal length of IVs accepted by this object + virtual unsigned int MinIVLength() const {return IVSize();} + //! returns maximal length of IVs accepted by this object + virtual unsigned int MaxIVLength() const {return IVSize();} + //! resynchronize with an IV. ivLength=-1 means use IVSize() + virtual void Resynchronize(const byte *iv, int ivLength=-1) {throw NotImplemented(GetAlgorithm().AlgorithmName() + ": this object doesn't support resynchronization");} + //! get a secure IV for the next message + /*! This method should be called after you finish encrypting one message and are ready to start the next one. + After calling it, you must call SetKey() or Resynchronize() before using this object again. + This method is not implemented on decryption objects. */ + virtual void GetNextIV(RandomNumberGenerator &rng, byte *IV); + +protected: + virtual const Algorithm & GetAlgorithm() const =0; + virtual void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms) =0; + + void ThrowIfInvalidKeyLength(size_t length); + void ThrowIfResynchronizable(); // to be called when no IV is passed + void ThrowIfInvalidIV(const byte *iv); // check for NULL IV if it can't be used + size_t ThrowIfInvalidIVLength(int size); + const byte * GetIVAndThrowIfInvalid(const NameValuePairs ¶ms, size_t &size); + inline void AssertValidKeyLength(size_t length) const + {assert(IsValidKeyLength(length));} +}; + +//! interface for the data processing part of block ciphers + +/*! Classes derived from BlockTransformation are block ciphers + in ECB mode (for example the DES::Encryption class), which are stateless. + These classes should not be used directly, but only in combination with + a mode class (see CipherModeDocumentation in modes.h). +*/ +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE BlockTransformation : public Algorithm +{ +public: + //! encrypt or decrypt inBlock, xor with xorBlock, and write to outBlock + virtual void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const =0; + + //! encrypt or decrypt one block + /*! \pre size of inBlock and outBlock == BlockSize() */ + void ProcessBlock(const byte *inBlock, byte *outBlock) const + {ProcessAndXorBlock(inBlock, NULL, outBlock);} + + //! encrypt or decrypt one block in place + void ProcessBlock(byte *inoutBlock) const + {ProcessAndXorBlock(inoutBlock, NULL, inoutBlock);} + + //! block size of the cipher in bytes + virtual unsigned int BlockSize() const =0; + + //! returns how inputs and outputs should be aligned for optimal performance + virtual unsigned int OptimalDataAlignment() const; + + //! returns true if this is a permutation (i.e. there is an inverse transformation) + virtual bool IsPermutation() const {return true;} + + //! returns true if this is an encryption object + virtual bool IsForwardTransformation() const =0; + + //! return number of blocks that can be processed in parallel, for bit-slicing implementations + virtual unsigned int OptimalNumberOfParallelBlocks() const {return 1;} + + enum {BT_InBlockIsCounter=1, BT_DontIncrementInOutPointers=2, BT_XorInput=4, BT_ReverseDirection=8, BT_AllowParallel=16} FlagsForAdvancedProcessBlocks; + + //! encrypt and xor blocks according to flags (see FlagsForAdvancedProcessBlocks) + /*! /note If BT_InBlockIsCounter is set, last byte of inBlocks may be modified. */ + virtual size_t AdvancedProcessBlocks(const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags) const; + + inline CipherDir GetCipherDirection() const {return IsForwardTransformation() ? ENCRYPTION : DECRYPTION;} +}; + +//! interface for the data processing part of stream ciphers + +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE StreamTransformation : public Algorithm +{ +public: + //! return a reference to this object, useful for passing a temporary object to a function that takes a non-const reference + StreamTransformation& Ref() {return *this;} + + //! returns block size, if input must be processed in blocks, otherwise 1 + virtual unsigned int MandatoryBlockSize() const {return 1;} + + //! returns the input block size that is most efficient for this cipher + /*! \note optimal input length is n * OptimalBlockSize() - GetOptimalBlockSizeUsed() for any n > 0 */ + virtual unsigned int OptimalBlockSize() const {return MandatoryBlockSize();} + //! returns how much of the current block is used up + virtual unsigned int GetOptimalBlockSizeUsed() const {return 0;} + + //! returns how input should be aligned for optimal performance + virtual unsigned int OptimalDataAlignment() const; + + //! encrypt or decrypt an array of bytes of specified length + /*! \note either inString == outString, or they don't overlap */ + virtual void ProcessData(byte *outString, const byte *inString, size_t length) =0; + + //! for ciphers where the last block of data is special, encrypt or decrypt the last block of data + /*! For now the only use of this function is for CBC-CTS mode. */ + virtual void ProcessLastBlock(byte *outString, const byte *inString, size_t length); + //! returns the minimum size of the last block, 0 indicating the last block is not special + virtual unsigned int MinLastBlockSize() const {return 0;} + + //! same as ProcessData(inoutString, inoutString, length) + inline void ProcessString(byte *inoutString, size_t length) + {ProcessData(inoutString, inoutString, length);} + //! same as ProcessData(outString, inString, length) + inline void ProcessString(byte *outString, const byte *inString, size_t length) + {ProcessData(outString, inString, length);} + //! implemented as {ProcessData(&input, &input, 1); return input;} + inline byte ProcessByte(byte input) + {ProcessData(&input, &input, 1); return input;} + + //! returns whether this cipher supports random access + virtual bool IsRandomAccess() const =0; + //! for random access ciphers, seek to an absolute position + virtual void Seek(lword n) + { + assert(!IsRandomAccess()); + throw NotImplemented("StreamTransformation: this object doesn't support random access"); + } + + //! returns whether this transformation is self-inverting (e.g. xor with a keystream) + virtual bool IsSelfInverting() const =0; + //! returns whether this is an encryption object + virtual bool IsForwardTransformation() const =0; +}; + +//! interface for hash functions and data processing part of MACs + +/*! HashTransformation objects are stateful. They are created in an initial state, + change state as Update() is called, and return to the initial + state when Final() is called. This interface allows a large message to + be hashed in pieces by calling Update() on each piece followed by + calling Final(). +*/ +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE HashTransformation : public Algorithm +{ +public: + //! return a reference to this object, useful for passing a temporary object to a function that takes a non-const reference + HashTransformation& Ref() {return *this;} + + //! process more input + virtual void Update(const byte *input, size_t length) =0; + + //! request space to write input into + virtual byte * CreateUpdateSpace(size_t &size) {size=0; return NULL;} + + //! compute hash for current message, then restart for a new message + /*! \pre size of digest == DigestSize(). */ + virtual void Final(byte *digest) + {TruncatedFinal(digest, DigestSize());} + + //! discard the current state, and restart with a new message + virtual void Restart() + {TruncatedFinal(NULL, 0);} + + //! size of the hash/digest/MAC returned by Final() + virtual unsigned int DigestSize() const =0; + + //! same as DigestSize() + unsigned int TagSize() const {return DigestSize();} + + + //! block size of underlying compression function, or 0 if not block based + virtual unsigned int BlockSize() const {return 0;} + + //! input to Update() should have length a multiple of this for optimal speed + virtual unsigned int OptimalBlockSize() const {return 1;} + + //! returns how input should be aligned for optimal performance + virtual unsigned int OptimalDataAlignment() const; + + //! use this if your input is in one piece and you don't want to call Update() and Final() separately + virtual void CalculateDigest(byte *digest, const byte *input, size_t length) + {Update(input, length); Final(digest);} + + //! verify that digest is a valid digest for the current message, then reinitialize the object + /*! Default implementation is to call Final() and do a bitwise comparison + between its output and digest. */ + virtual bool Verify(const byte *digest) + {return TruncatedVerify(digest, DigestSize());} + + //! use this if your input is in one piece and you don't want to call Update() and Verify() separately + virtual bool VerifyDigest(const byte *digest, const byte *input, size_t length) + {Update(input, length); return Verify(digest);} + + //! truncated version of Final() + virtual void TruncatedFinal(byte *digest, size_t digestSize) =0; + + //! truncated version of CalculateDigest() + virtual void CalculateTruncatedDigest(byte *digest, size_t digestSize, const byte *input, size_t length) + {Update(input, length); TruncatedFinal(digest, digestSize);} + + //! truncated version of Verify() + virtual bool TruncatedVerify(const byte *digest, size_t digestLength); + + //! truncated version of VerifyDigest() + virtual bool VerifyTruncatedDigest(const byte *digest, size_t digestLength, const byte *input, size_t length) + {Update(input, length); return TruncatedVerify(digest, digestLength);} + +protected: + void ThrowIfInvalidTruncatedSize(size_t size) const; +}; + +typedef HashTransformation HashFunction; + +//! interface for one direction (encryption or decryption) of a block cipher +/*! \note These objects usually should not be used directly. See BlockTransformation for more details. */ +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE BlockCipher : public SimpleKeyingInterface, public BlockTransformation +{ +protected: + const Algorithm & GetAlgorithm() const {return *this;} +}; + +//! interface for one direction (encryption or decryption) of a stream cipher or cipher mode +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE SymmetricCipher : public SimpleKeyingInterface, public StreamTransformation +{ +protected: + const Algorithm & GetAlgorithm() const {return *this;} +}; + +//! interface for message authentication codes +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE MessageAuthenticationCode : public SimpleKeyingInterface, public HashTransformation +{ +protected: + const Algorithm & GetAlgorithm() const {return *this;} +}; + +//! interface for for one direction (encryption or decryption) of a stream cipher or block cipher mode with authentication +/*! The StreamTransformation part of this interface is used to encrypt/decrypt the data, and the MessageAuthenticationCode part of this + interface is used to input additional authenticated data (AAD, which is MAC'ed but not encrypted), and to generate/verify the MAC. */ +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE AuthenticatedSymmetricCipher : public MessageAuthenticationCode, public StreamTransformation +{ +public: + //! this indicates that a member function was called in the wrong state, for example trying to encrypt a message before having set the key or IV + class BadState : public Exception + { + public: + explicit BadState(const std::string &name, const char *message) : Exception(OTHER_ERROR, name + ": " + message) {} + explicit BadState(const std::string &name, const char *function, const char *state) : Exception(OTHER_ERROR, name + ": " + function + " was called before " + state) {} + }; + + //! the maximum length of AAD that can be input before the encrypted data + virtual lword MaxHeaderLength() const =0; + //! the maximum length of encrypted data + virtual lword MaxMessageLength() const =0; + //! the maximum length of AAD that can be input after the encrypted data + virtual lword MaxFooterLength() const {return 0;} + //! if this function returns true, SpecifyDataLengths() must be called before attempting to input data + /*! This is the case for some schemes, such as CCM. */ + virtual bool NeedsPrespecifiedDataLengths() const {return false;} + //! this function only needs to be called if NeedsPrespecifiedDataLengths() returns true + void SpecifyDataLengths(lword headerLength, lword messageLength, lword footerLength=0); + //! encrypt and generate MAC in one call. will truncate MAC if macSize < TagSize() + 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); + //! decrypt and verify MAC in one call, returning true iff MAC is valid. will assume MAC is truncated if macLength < TagSize() + virtual bool DecryptAndVerify(byte *message, const byte *mac, size_t macLength, const byte *iv, int ivLength, const byte *header, size_t headerLength, const byte *ciphertext, size_t ciphertextLength); + + // redeclare this to avoid compiler ambiguity errors + virtual std::string AlgorithmName() const =0; + +protected: + const Algorithm & GetAlgorithm() const {return *static_cast<const MessageAuthenticationCode *>(this);} + virtual void UncheckedSpecifyDataLengths(lword headerLength, lword messageLength, lword footerLength) {} +}; + +#ifdef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY +typedef SymmetricCipher StreamCipher; +#endif + +//! interface for random number generators +/*! All return values are uniformly distributed over the range specified. +*/ +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE RandomNumberGenerator : public Algorithm +{ +public: + //! update RNG state with additional unpredictable values + virtual void IncorporateEntropy(const byte *input, size_t length) {throw NotImplemented("RandomNumberGenerator: IncorporateEntropy not implemented");} + + //! returns true if IncorporateEntropy is implemented + virtual bool CanIncorporateEntropy() const {return false;} + + //! generate new random byte and return it + virtual byte GenerateByte(); + + //! generate new random bit and return it + /*! Default implementation is to call GenerateByte() and return its lowest bit. */ + virtual unsigned int GenerateBit(); + + //! generate a random 32 bit word in the range min to max, inclusive + virtual word32 GenerateWord32(word32 a=0, word32 b=0xffffffffL); + + //! generate random array of bytes + virtual void GenerateBlock(byte *output, size_t size); + + //! generate and discard n bytes + virtual void DiscardBytes(size_t n); + + //! generate random bytes as input to a BufferedTransformation + virtual void GenerateIntoBufferedTransformation(BufferedTransformation &target, const std::string &channel, lword length); + + //! randomly shuffle the specified array, resulting permutation is uniformly distributed + template <class IT> void Shuffle(IT begin, IT end) + { + for (; begin != end; ++begin) + std::iter_swap(begin, begin + GenerateWord32(0, end-begin-1)); + } + +#ifdef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY + byte GetByte() {return GenerateByte();} + unsigned int GetBit() {return GenerateBit();} + word32 GetLong(word32 a=0, word32 b=0xffffffffL) {return GenerateWord32(a, b);} + word16 GetShort(word16 a=0, word16 b=0xffff) {return (word16)GenerateWord32(a, b);} + void GetBlock(byte *output, size_t size) {GenerateBlock(output, size);} +#endif +}; + +//! returns a reference that can be passed to functions that ask for a RNG but doesn't actually use it +CRYPTOPP_DLL RandomNumberGenerator & CRYPTOPP_API NullRNG(); + +class WaitObjectContainer; +class CallStack; + +//! interface for objects that you can wait for + +class CRYPTOPP_NO_VTABLE Waitable +{ +public: + virtual ~Waitable() {} + + //! maximum number of wait objects that this object can return + virtual unsigned int GetMaxWaitObjectCount() const =0; + //! put wait objects into container + /*! \param callStack is used for tracing no wait loops, example: + something.GetWaitObjects(c, CallStack("my func after X", 0)); + - or in an outer GetWaitObjects() method that itself takes a callStack parameter: + innerThing.GetWaitObjects(c, CallStack("MyClass::GetWaitObjects at X", &callStack)); */ + virtual void GetWaitObjects(WaitObjectContainer &container, CallStack const& callStack) =0; + //! wait on this object + /*! same as creating an empty container, calling GetWaitObjects(), and calling Wait() on the container */ + bool Wait(unsigned long milliseconds, CallStack const& callStack); +}; + +//! the default channel for BufferedTransformation, equal to the empty string +extern CRYPTOPP_DLL const std::string DEFAULT_CHANNEL; + +//! channel for additional authenticated data, equal to "AAD" +extern CRYPTOPP_DLL const std::string AAD_CHANNEL; + +//! interface for buffered transformations + +/*! BufferedTransformation is a generalization of BlockTransformation, + StreamTransformation, and HashTransformation. + + A buffered transformation is an object that takes a stream of bytes + as input (this may be done in stages), does some computation on them, and + then places the result into an internal buffer for later retrieval. Any + partial result already in the output buffer is not modified by further + input. + + If a method takes a "blocking" parameter, and you + pass "false" for it, the method will return before all input has been processed if + the input cannot be processed without waiting (for network buffers to become available, for example). + In this case the method will return true + or a non-zero integer value. When this happens you must continue to call the method with the same + parameters until it returns false or zero, before calling any other method on it or + attached BufferedTransformation. The integer return value in this case is approximately + the number of bytes left to be processed, and can be used to implement a progress bar. + + For functions that take a "propagation" parameter, propagation != 0 means pass on the signal to attached + BufferedTransformation objects, with propagation decremented at each step until it reaches 0. + -1 means unlimited propagation. + + \nosubgrouping +*/ +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE BufferedTransformation : public Algorithm, public Waitable +{ +public: + // placed up here for CW8 + static const std::string &NULL_CHANNEL; // same as DEFAULT_CHANNEL, for backwards compatibility + + BufferedTransformation() : Algorithm(false) {} + + //! return a reference to this object, useful for passing a temporary object to a function that takes a non-const reference + BufferedTransformation& Ref() {return *this;} + + //! \name INPUT + //@{ + //! input a byte for processing + size_t Put(byte inByte, bool blocking=true) + {return Put(&inByte, 1, blocking);} + //! input multiple bytes + size_t Put(const byte *inString, size_t length, bool blocking=true) + {return Put2(inString, length, 0, blocking);} + + //! input a 16-bit word + size_t PutWord16(word16 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true); + //! input a 32-bit word + size_t PutWord32(word32 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true); + + //! request space which can be written into by the caller, and then used as input to Put() + /*! \param size is requested size (as a hint) for input, and size of the returned space for output */ + /*! \note The purpose of this method is to help avoid doing extra memory allocations. */ + virtual byte * CreatePutSpace(size_t &size) {size=0; return NULL;} + + virtual bool CanModifyInput() const {return false;} + + //! input multiple bytes that may be modified by callee + size_t PutModifiable(byte *inString, size_t length, bool blocking=true) + {return PutModifiable2(inString, length, 0, blocking);} + + bool MessageEnd(int propagation=-1, bool blocking=true) + {return !!Put2(NULL, 0, propagation < 0 ? -1 : propagation+1, blocking);} + size_t PutMessageEnd(const byte *inString, size_t length, int propagation=-1, bool blocking=true) + {return Put2(inString, length, propagation < 0 ? -1 : propagation+1, blocking);} + + //! input multiple bytes for blocking or non-blocking processing + /*! \param messageEnd means how many filters to signal MessageEnd to, including this one */ + virtual size_t Put2(const byte *inString, size_t length, int messageEnd, bool blocking) =0; + //! input multiple bytes that may be modified by callee for blocking or non-blocking processing + /*! \param messageEnd means how many filters to signal MessageEnd to, including this one */ + virtual size_t PutModifiable2(byte *inString, size_t length, int messageEnd, bool blocking) + {return Put2(inString, length, messageEnd, blocking);} + + //! thrown by objects that have not implemented nonblocking input processing + struct BlockingInputOnly : public NotImplemented + {BlockingInputOnly(const std::string &s) : NotImplemented(s + ": Nonblocking input is not implemented by this object.") {}}; + //@} + + //! \name WAITING + //@{ + unsigned int GetMaxWaitObjectCount() const; + void GetWaitObjects(WaitObjectContainer &container, CallStack const& callStack); + //@} + + //! \name SIGNALS + //@{ + virtual void IsolatedInitialize(const NameValuePairs ¶meters) {throw NotImplemented("BufferedTransformation: this object can't be reinitialized");} + virtual bool IsolatedFlush(bool hardFlush, bool blocking) =0; + virtual bool IsolatedMessageSeriesEnd(bool blocking) {return false;} + + //! initialize or reinitialize this object + virtual void Initialize(const NameValuePairs ¶meters=g_nullNameValuePairs, int propagation=-1); + //! flush buffered input and/or output + /*! \param hardFlush is used to indicate whether all data should be flushed + \note Hard flushes must be used with care. It means try to process and output everything, even if + there may not be enough data to complete the action. For example, hard flushing a HexDecoder would + cause an error if you do it after inputing an odd number of hex encoded characters. + For some types of filters, for example ZlibDecompressor, hard flushes can only + be done at "synchronization points". These synchronization points are positions in the data + stream that are created by hard flushes on the corresponding reverse filters, in this + example ZlibCompressor. This is useful when zlib compressed data is moved across a + network in packets and compression state is preserved across packets, as in the ssh2 protocol. + */ + virtual bool Flush(bool hardFlush, int propagation=-1, bool blocking=true); + //! mark end of a series of messages + /*! There should be a MessageEnd immediately before MessageSeriesEnd. */ + virtual bool MessageSeriesEnd(int propagation=-1, bool blocking=true); + + //! set propagation of automatically generated and transferred signals + /*! propagation == 0 means do not automaticly generate signals */ + virtual void SetAutoSignalPropagation(int propagation) {} + + //! + virtual int GetAutoSignalPropagation() const {return 0;} +public: + +#ifdef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY + void Close() {MessageEnd();} +#endif + //@} + + //! \name RETRIEVAL OF ONE MESSAGE + //@{ + //! returns number of bytes that is currently ready for retrieval + /*! All retrieval functions return the actual number of bytes + retrieved, which is the lesser of the request number and + MaxRetrievable(). */ + virtual lword MaxRetrievable() const; + + //! returns whether any bytes are currently ready for retrieval + virtual bool AnyRetrievable() const; + + //! try to retrieve a single byte + virtual size_t Get(byte &outByte); + //! try to retrieve multiple bytes + virtual size_t Get(byte *outString, size_t getMax); + + //! peek at the next byte without removing it from the output buffer + virtual size_t Peek(byte &outByte) const; + //! peek at multiple bytes without removing them from the output buffer + virtual size_t Peek(byte *outString, size_t peekMax) const; + + //! try to retrieve a 16-bit word + size_t GetWord16(word16 &value, ByteOrder order=BIG_ENDIAN_ORDER); + //! try to retrieve a 32-bit word + size_t GetWord32(word32 &value, ByteOrder order=BIG_ENDIAN_ORDER); + + //! try to peek at a 16-bit word + size_t PeekWord16(word16 &value, ByteOrder order=BIG_ENDIAN_ORDER) const; + //! try to peek at a 32-bit word + size_t PeekWord32(word32 &value, ByteOrder order=BIG_ENDIAN_ORDER) const; + + //! move transferMax bytes of the buffered output to target as input + lword TransferTo(BufferedTransformation &target, lword transferMax=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL) + {TransferTo2(target, transferMax, channel); return transferMax;} + + //! discard skipMax bytes from the output buffer + virtual lword Skip(lword skipMax=LWORD_MAX); + + //! copy copyMax bytes of the buffered output to target as input + lword CopyTo(BufferedTransformation &target, lword copyMax=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL) const + {return CopyRangeTo(target, 0, copyMax, channel);} + + //! copy copyMax bytes of the buffered output, starting at position (relative to current position), to target as input + lword CopyRangeTo(BufferedTransformation &target, lword position, lword copyMax=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL) const + {lword i = position; CopyRangeTo2(target, i, i+copyMax, channel); return i-position;} + +#ifdef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY + unsigned long MaxRetrieveable() const {return MaxRetrievable();} +#endif + //@} + + //! \name RETRIEVAL OF MULTIPLE MESSAGES + //@{ + //! + virtual lword TotalBytesRetrievable() const; + //! number of times MessageEnd() has been received minus messages retrieved or skipped + virtual unsigned int NumberOfMessages() const; + //! returns true if NumberOfMessages() > 0 + virtual bool AnyMessages() const; + //! start retrieving the next message + /*! + Returns false if no more messages exist or this message + is not completely retrieved. + */ + virtual bool GetNextMessage(); + //! skip count number of messages + virtual unsigned int SkipMessages(unsigned int count=UINT_MAX); + //! + unsigned int TransferMessagesTo(BufferedTransformation &target, unsigned int count=UINT_MAX, const std::string &channel=DEFAULT_CHANNEL) + {TransferMessagesTo2(target, count, channel); return count;} + //! + unsigned int CopyMessagesTo(BufferedTransformation &target, unsigned int count=UINT_MAX, const std::string &channel=DEFAULT_CHANNEL) const; + + //! + virtual void SkipAll(); + //! + void TransferAllTo(BufferedTransformation &target, const std::string &channel=DEFAULT_CHANNEL) + {TransferAllTo2(target, channel);} + //! + void CopyAllTo(BufferedTransformation &target, const std::string &channel=DEFAULT_CHANNEL) const; + + virtual bool GetNextMessageSeries() {return false;} + virtual unsigned int NumberOfMessagesInThisSeries() const {return NumberOfMessages();} + virtual unsigned int NumberOfMessageSeries() const {return 0;} + //@} + + //! \name NON-BLOCKING TRANSFER OF OUTPUT + //@{ + //! upon return, byteCount contains number of bytes that have finished being transfered, and returns the number of bytes left in the current transfer block + virtual size_t TransferTo2(BufferedTransformation &target, lword &byteCount, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true) =0; + //! upon return, begin contains the start position of data yet to be finished copying, and returns the number of bytes left in the current transfer block + virtual size_t CopyRangeTo2(BufferedTransformation &target, lword &begin, lword end=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true) const =0; + //! upon return, messageCount contains number of messages that have finished being transfered, and returns the number of bytes left in the current transfer block + size_t TransferMessagesTo2(BufferedTransformation &target, unsigned int &messageCount, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true); + //! returns the number of bytes left in the current transfer block + size_t TransferAllTo2(BufferedTransformation &target, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true); + //@} + + //! \name CHANNELS + //@{ + struct NoChannelSupport : public NotImplemented + {NoChannelSupport(const std::string &name) : NotImplemented(name + ": this object doesn't support multiple channels") {}}; + struct InvalidChannelName : public InvalidArgument + {InvalidChannelName(const std::string &name, const std::string &channel) : InvalidArgument(name + ": unexpected channel name \"" + channel + "\"") {}}; + + size_t ChannelPut(const std::string &channel, byte inByte, bool blocking=true) + {return ChannelPut(channel, &inByte, 1, blocking);} + size_t ChannelPut(const std::string &channel, const byte *inString, size_t length, bool blocking=true) + {return ChannelPut2(channel, inString, length, 0, blocking);} + + size_t ChannelPutModifiable(const std::string &channel, byte *inString, size_t length, bool blocking=true) + {return ChannelPutModifiable2(channel, inString, length, 0, blocking);} + + size_t ChannelPutWord16(const std::string &channel, word16 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true); + size_t ChannelPutWord32(const std::string &channel, word32 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true); + + bool ChannelMessageEnd(const std::string &channel, int propagation=-1, bool blocking=true) + {return !!ChannelPut2(channel, NULL, 0, propagation < 0 ? -1 : propagation+1, blocking);} + size_t ChannelPutMessageEnd(const std::string &channel, const byte *inString, size_t length, int propagation=-1, bool blocking=true) + {return ChannelPut2(channel, inString, length, propagation < 0 ? -1 : propagation+1, blocking);} + + virtual byte * ChannelCreatePutSpace(const std::string &channel, size_t &size); + + virtual size_t ChannelPut2(const std::string &channel, const byte *begin, size_t length, int messageEnd, bool blocking); + virtual size_t ChannelPutModifiable2(const std::string &channel, byte *begin, size_t length, int messageEnd, bool blocking); + + virtual bool ChannelFlush(const std::string &channel, bool hardFlush, int propagation=-1, bool blocking=true); + virtual bool ChannelMessageSeriesEnd(const std::string &channel, int propagation=-1, bool blocking=true); + + virtual void SetRetrievalChannel(const std::string &channel); + //@} + + //! \name ATTACHMENT + /*! Some BufferedTransformation objects (e.g. Filter objects) + allow other BufferedTransformation objects to be attached. When + this is done, the first object instead of buffering its output, + sents that output to the attached object as input. The entire + attachment chain is deleted when the anchor object is destructed. + */ + //@{ + //! returns whether this object allows attachment + virtual bool Attachable() {return false;} + //! returns the object immediately attached to this object or NULL for no attachment + virtual BufferedTransformation *AttachedTransformation() {assert(!Attachable()); return 0;} + //! + virtual const BufferedTransformation *AttachedTransformation() const + {return const_cast<BufferedTransformation *>(this)->AttachedTransformation();} + //! delete the current attachment chain and replace it with newAttachment + virtual void Detach(BufferedTransformation *newAttachment = 0) + {assert(!Attachable()); throw NotImplemented("BufferedTransformation: this object is not attachable");} + //! add newAttachment to the end of attachment chain + virtual void Attach(BufferedTransformation *newAttachment); + //@} + +protected: + static int DecrementPropagation(int propagation) + {return propagation != 0 ? propagation - 1 : 0;} + +private: + byte m_buf[4]; // for ChannelPutWord16 and ChannelPutWord32, to ensure buffer isn't deallocated before non-blocking operation completes +}; + +//! returns a reference to a BufferedTransformation object that discards all input +BufferedTransformation & TheBitBucket(); + +//! interface for crypto material, such as public and private keys, and crypto parameters + +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CryptoMaterial : public NameValuePairs +{ +public: + //! exception thrown when invalid crypto material is detected + class CRYPTOPP_DLL InvalidMaterial : public InvalidDataFormat + { + public: + explicit InvalidMaterial(const std::string &s) : InvalidDataFormat(s) {} + }; + + //! assign values from source to this object + /*! \note This function can be used to create a public key from a private key. */ + virtual void AssignFrom(const NameValuePairs &source) =0; + + //! check this object for errors + /*! \param level denotes the level of thoroughness: + 0 - using this object won't cause a crash or exception (rng is ignored) + 1 - this object will probably function (encrypt, sign, etc.) correctly (but may not check for weak keys and such) + 2 - make sure this object will function correctly, and do reasonable security checks + 3 - do checks that may take a long time + \return true if the tests pass */ + virtual bool Validate(RandomNumberGenerator &rng, unsigned int level) const =0; + + //! throws InvalidMaterial if this object fails Validate() test + virtual void ThrowIfInvalid(RandomNumberGenerator &rng, unsigned int level) const + {if (!Validate(rng, level)) throw InvalidMaterial("CryptoMaterial: this object contains invalid values");} + +// virtual std::vector<std::string> GetSupportedFormats(bool includeSaveOnly=false, bool includeLoadOnly=false); + + //! save key into a BufferedTransformation + virtual void Save(BufferedTransformation &bt) const + {throw NotImplemented("CryptoMaterial: this object does not support saving");} + + //! load key from a BufferedTransformation + /*! \throws KeyingErr if decode fails + \note Generally does not check that the key is valid. + Call ValidateKey() or ThrowIfInvalidKey() to check that. */ + virtual void Load(BufferedTransformation &bt) + {throw NotImplemented("CryptoMaterial: this object does not support loading");} + + //! \return whether this object supports precomputation + virtual bool SupportsPrecomputation() const {return false;} + //! do precomputation + /*! The exact semantics of Precompute() is varies, but + typically it means calculate a table of n objects + that can be used later to speed up computation. */ + virtual void Precompute(unsigned int n) + {assert(!SupportsPrecomputation()); throw NotImplemented("CryptoMaterial: this object does not support precomputation");} + //! retrieve previously saved precomputation + virtual void LoadPrecomputation(BufferedTransformation &storedPrecomputation) + {assert(!SupportsPrecomputation()); throw NotImplemented("CryptoMaterial: this object does not support precomputation");} + //! save precomputation for later use + virtual void SavePrecomputation(BufferedTransformation &storedPrecomputation) const + {assert(!SupportsPrecomputation()); throw NotImplemented("CryptoMaterial: this object does not support precomputation");} + + // for internal library use + void DoQuickSanityCheck() const {ThrowIfInvalid(NullRNG(), 0);} + +#if (defined(__SUNPRO_CC) && __SUNPRO_CC < 0x590) + // Sun Studio 11/CC 5.8 workaround: it generates incorrect code when casting to an empty virtual base class + char m_sunCCworkaround; +#endif +}; + +//! interface for generatable crypto material, such as private keys and crypto parameters + +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE GeneratableCryptoMaterial : virtual public CryptoMaterial +{ +public: + //! generate a random key or crypto parameters + /*! \throws KeyingErr if algorithm parameters are invalid, or if a key can't be generated + (e.g., if this is a public key object) */ + virtual void GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs ¶ms = g_nullNameValuePairs) + {throw NotImplemented("GeneratableCryptoMaterial: this object does not support key/parameter generation");} + + //! calls the above function with a NameValuePairs object that just specifies "KeySize" + void GenerateRandomWithKeySize(RandomNumberGenerator &rng, unsigned int keySize); +}; + +//! interface for public keys + +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PublicKey : virtual public CryptoMaterial +{ +}; + +//! interface for private keys + +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PrivateKey : public GeneratableCryptoMaterial +{ +}; + +//! interface for crypto prameters + +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CryptoParameters : public GeneratableCryptoMaterial +{ +}; + +//! interface for asymmetric algorithms + +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE AsymmetricAlgorithm : public Algorithm +{ +public: + //! returns a reference to the crypto material used by this object + virtual CryptoMaterial & AccessMaterial() =0; + //! returns a const reference to the crypto material used by this object + virtual const CryptoMaterial & GetMaterial() const =0; + + //! for backwards compatibility, calls AccessMaterial().Load(bt) + void BERDecode(BufferedTransformation &bt) + {AccessMaterial().Load(bt);} + //! for backwards compatibility, calls GetMaterial().Save(bt) + void DEREncode(BufferedTransformation &bt) const + {GetMaterial().Save(bt);} +}; + +//! interface for asymmetric algorithms using public keys + +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PublicKeyAlgorithm : public AsymmetricAlgorithm +{ +public: + // VC60 workaround: no co-variant return type + CryptoMaterial & AccessMaterial() {return AccessPublicKey();} + const CryptoMaterial & GetMaterial() const {return GetPublicKey();} + + virtual PublicKey & AccessPublicKey() =0; + virtual const PublicKey & GetPublicKey() const {return const_cast<PublicKeyAlgorithm *>(this)->AccessPublicKey();} +}; + +//! interface for asymmetric algorithms using private keys + +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PrivateKeyAlgorithm : public AsymmetricAlgorithm +{ +public: + CryptoMaterial & AccessMaterial() {return AccessPrivateKey();} + const CryptoMaterial & GetMaterial() const {return GetPrivateKey();} + + virtual PrivateKey & AccessPrivateKey() =0; + virtual const PrivateKey & GetPrivateKey() const {return const_cast<PrivateKeyAlgorithm *>(this)->AccessPrivateKey();} +}; + +//! interface for key agreement algorithms + +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE KeyAgreementAlgorithm : public AsymmetricAlgorithm +{ +public: + CryptoMaterial & AccessMaterial() {return AccessCryptoParameters();} + const CryptoMaterial & GetMaterial() const {return GetCryptoParameters();} + + virtual CryptoParameters & AccessCryptoParameters() =0; + virtual const CryptoParameters & GetCryptoParameters() const {return const_cast<KeyAgreementAlgorithm *>(this)->AccessCryptoParameters();} +}; + +//! interface for public-key encryptors and decryptors + +/*! This class provides an interface common to encryptors and decryptors + for querying their plaintext and ciphertext lengths. +*/ +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_CryptoSystem +{ +public: + virtual ~PK_CryptoSystem() {} + + //! maximum length of plaintext for a given ciphertext length + /*! \note This function returns 0 if ciphertextLength is not valid (too long or too short). */ + virtual size_t MaxPlaintextLength(size_t ciphertextLength) const =0; + + //! calculate length of ciphertext given length of plaintext + /*! \note This function returns 0 if plaintextLength is not valid (too long). */ + virtual size_t CiphertextLength(size_t plaintextLength) const =0; + + //! this object supports the use of the parameter with the given name + /*! some possible parameter names: EncodingParameters, KeyDerivationParameters */ + virtual bool ParameterSupported(const char *name) const =0; + + //! return fixed ciphertext length, if one exists, otherwise return 0 + /*! \note "Fixed" here means length of ciphertext does not depend on length of plaintext. + It usually does depend on the key length. */ + virtual size_t FixedCiphertextLength() const {return 0;} + + //! return maximum plaintext length given the fixed ciphertext length, if one exists, otherwise return 0 + virtual size_t FixedMaxPlaintextLength() const {return 0;} + +#ifdef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY + size_t MaxPlainTextLength(size_t cipherTextLength) const {return MaxPlaintextLength(cipherTextLength);} + size_t CipherTextLength(size_t plainTextLength) const {return CiphertextLength(plainTextLength);} +#endif +}; + +//! interface for public-key encryptors +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_Encryptor : public PK_CryptoSystem, public PublicKeyAlgorithm +{ +public: + //! exception thrown when trying to encrypt plaintext of invalid length + class CRYPTOPP_DLL InvalidPlaintextLength : public Exception + { + public: + InvalidPlaintextLength() : Exception(OTHER_ERROR, "PK_Encryptor: invalid plaintext length") {} + }; + + //! encrypt a byte string + /*! \pre CiphertextLength(plaintextLength) != 0 (i.e., plaintext isn't too long) + \pre size of ciphertext == CiphertextLength(plaintextLength) + */ + virtual void Encrypt(RandomNumberGenerator &rng, + const byte *plaintext, size_t plaintextLength, + byte *ciphertext, const NameValuePairs ¶meters = g_nullNameValuePairs) const =0; + + //! create a new encryption filter + /*! \note The caller is responsible for deleting the returned pointer. + \note Encoding parameters should be passed in the "EP" channel. + */ + virtual BufferedTransformation * CreateEncryptionFilter(RandomNumberGenerator &rng, + BufferedTransformation *attachment=NULL, const NameValuePairs ¶meters = g_nullNameValuePairs) const; +}; + +//! interface for public-key decryptors + +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_Decryptor : public PK_CryptoSystem, public PrivateKeyAlgorithm +{ +public: + //! decrypt a byte string, and return the length of plaintext + /*! \pre size of plaintext == MaxPlaintextLength(ciphertextLength) bytes. + \return the actual length of the plaintext, indication that decryption failed. + */ + virtual DecodingResult Decrypt(RandomNumberGenerator &rng, + const byte *ciphertext, size_t ciphertextLength, + byte *plaintext, const NameValuePairs ¶meters = g_nullNameValuePairs) const =0; + + //! create a new decryption filter + /*! \note caller is responsible for deleting the returned pointer + */ + virtual BufferedTransformation * CreateDecryptionFilter(RandomNumberGenerator &rng, + BufferedTransformation *attachment=NULL, const NameValuePairs ¶meters = g_nullNameValuePairs) const; + + //! decrypt a fixed size ciphertext + DecodingResult FixedLengthDecrypt(RandomNumberGenerator &rng, const byte *ciphertext, byte *plaintext, const NameValuePairs ¶meters = g_nullNameValuePairs) const + {return Decrypt(rng, ciphertext, FixedCiphertextLength(), plaintext, parameters);} +}; + +#ifdef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY +typedef PK_CryptoSystem PK_FixedLengthCryptoSystem; +typedef PK_Encryptor PK_FixedLengthEncryptor; +typedef PK_Decryptor PK_FixedLengthDecryptor; +#endif + +//! interface for public-key signers and verifiers + +/*! This class provides an interface common to signers and verifiers + for querying scheme properties. +*/ +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_SignatureScheme +{ +public: + //! invalid key exception, may be thrown by any function in this class if the private or public key has a length that can't be used + class CRYPTOPP_DLL InvalidKeyLength : public Exception + { + public: + InvalidKeyLength(const std::string &message) : Exception(OTHER_ERROR, message) {} + }; + + //! key too short exception, may be thrown by any function in this class if the private or public key is too short to sign or verify anything + class CRYPTOPP_DLL KeyTooShort : public InvalidKeyLength + { + public: + KeyTooShort() : InvalidKeyLength("PK_Signer: key too short for this signature scheme") {} + }; + + virtual ~PK_SignatureScheme() {} + + //! signature length if it only depends on the key, otherwise 0 + virtual size_t SignatureLength() const =0; + + //! maximum signature length produced for a given length of recoverable message part + virtual size_t MaxSignatureLength(size_t recoverablePartLength = 0) const {return SignatureLength();} + + //! length of longest message that can be recovered, or 0 if this signature scheme does not support message recovery + virtual size_t MaxRecoverableLength() const =0; + + //! length of longest message that can be recovered from a signature of given length, or 0 if this signature scheme does not support message recovery + virtual size_t MaxRecoverableLengthFromSignatureLength(size_t signatureLength) const =0; + + //! requires a random number generator to sign + /*! if this returns false, NullRNG() can be passed to functions that take RandomNumberGenerator & */ + virtual bool IsProbabilistic() const =0; + + //! whether or not a non-recoverable message part can be signed + virtual bool AllowNonrecoverablePart() const =0; + + //! if this function returns true, during verification you must input the signature before the message, otherwise you can input it at anytime */ + virtual bool SignatureUpfront() const {return false;} + + //! whether you must input the recoverable part before the non-recoverable part during signing + virtual bool RecoverablePartFirst() const =0; +}; + +//! interface for accumulating messages to be signed or verified +/*! Only Update() should be called + on this class. No other functions inherited from HashTransformation should be called. +*/ +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_MessageAccumulator : public HashTransformation +{ +public: + //! should not be called on PK_MessageAccumulator + unsigned int DigestSize() const + {throw NotImplemented("PK_MessageAccumulator: DigestSize() should not be called");} + //! should not be called on PK_MessageAccumulator + void TruncatedFinal(byte *digest, size_t digestSize) + {throw NotImplemented("PK_MessageAccumulator: TruncatedFinal() should not be called");} +}; + +//! interface for public-key signers + +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_Signer : public PK_SignatureScheme, public PrivateKeyAlgorithm +{ +public: + //! create a new HashTransformation to accumulate the message to be signed + virtual PK_MessageAccumulator * NewSignatureAccumulator(RandomNumberGenerator &rng) const =0; + + virtual void InputRecoverableMessage(PK_MessageAccumulator &messageAccumulator, const byte *recoverableMessage, size_t recoverableMessageLength) const =0; + + //! sign and delete messageAccumulator (even in case of exception thrown) + /*! \pre size of signature == MaxSignatureLength() + \return actual signature length + */ + virtual size_t Sign(RandomNumberGenerator &rng, PK_MessageAccumulator *messageAccumulator, byte *signature) const; + + //! sign and restart messageAccumulator + /*! \pre size of signature == MaxSignatureLength() + \return actual signature length + */ + virtual size_t SignAndRestart(RandomNumberGenerator &rng, PK_MessageAccumulator &messageAccumulator, byte *signature, bool restart=true) const =0; + + //! sign a message + /*! \pre size of signature == MaxSignatureLength() + \return actual signature length + */ + virtual size_t SignMessage(RandomNumberGenerator &rng, const byte *message, size_t messageLen, byte *signature) const; + + //! sign a recoverable message + /*! \pre size of signature == MaxSignatureLength(recoverableMessageLength) + \return actual signature length + */ + virtual size_t SignMessageWithRecovery(RandomNumberGenerator &rng, const byte *recoverableMessage, size_t recoverableMessageLength, + const byte *nonrecoverableMessage, size_t nonrecoverableMessageLength, byte *signature) const; +}; + +//! interface for public-key signature verifiers +/*! The Recover* functions throw NotImplemented if the signature scheme does not support + message recovery. + The Verify* functions throw InvalidDataFormat if the scheme does support message + recovery and the signature contains a non-empty recoverable message part. The + Recovery* functions should be used in that case. +*/ +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_Verifier : public PK_SignatureScheme, public PublicKeyAlgorithm +{ +public: + //! create a new HashTransformation to accumulate the message to be verified + virtual PK_MessageAccumulator * NewVerificationAccumulator() const =0; + + //! input signature into a message accumulator + virtual void InputSignature(PK_MessageAccumulator &messageAccumulator, const byte *signature, size_t signatureLength) const =0; + + //! check whether messageAccumulator contains a valid signature and message, and delete messageAccumulator (even in case of exception thrown) + virtual bool Verify(PK_MessageAccumulator *messageAccumulator) const; + + //! check whether messageAccumulator contains a valid signature and message, and restart messageAccumulator + virtual bool VerifyAndRestart(PK_MessageAccumulator &messageAccumulator) const =0; + + //! check whether input signature is a valid signature for input message + virtual bool VerifyMessage(const byte *message, size_t messageLen, + const byte *signature, size_t signatureLength) const; + + //! recover a message from its signature + /*! \pre size of recoveredMessage == MaxRecoverableLengthFromSignatureLength(signatureLength) + */ + virtual DecodingResult Recover(byte *recoveredMessage, PK_MessageAccumulator *messageAccumulator) const; + + //! recover a message from its signature + /*! \pre size of recoveredMessage == MaxRecoverableLengthFromSignatureLength(signatureLength) + */ + virtual DecodingResult RecoverAndRestart(byte *recoveredMessage, PK_MessageAccumulator &messageAccumulator) const =0; + + //! recover a message from its signature + /*! \pre size of recoveredMessage == MaxRecoverableLengthFromSignatureLength(signatureLength) + */ + virtual DecodingResult RecoverMessage(byte *recoveredMessage, + const byte *nonrecoverableMessage, size_t nonrecoverableMessageLength, + const byte *signature, size_t signatureLength) const; +}; + +//! interface for domains of simple key agreement protocols + +/*! A key agreement domain is a set of parameters that must be shared + by two parties in a key agreement protocol, along with the algorithms + for generating key pairs and deriving agreed values. +*/ +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE SimpleKeyAgreementDomain : public KeyAgreementAlgorithm +{ +public: + //! return length of agreed value produced + virtual unsigned int AgreedValueLength() const =0; + //! return length of private keys in this domain + virtual unsigned int PrivateKeyLength() const =0; + //! return length of public keys in this domain + virtual unsigned int PublicKeyLength() const =0; + //! generate private key + /*! \pre size of privateKey == PrivateKeyLength() */ + virtual void GeneratePrivateKey(RandomNumberGenerator &rng, byte *privateKey) const =0; + //! generate public key + /*! \pre size of publicKey == PublicKeyLength() */ + virtual void GeneratePublicKey(RandomNumberGenerator &rng, const byte *privateKey, byte *publicKey) const =0; + //! generate private/public key pair + /*! \note equivalent to calling GeneratePrivateKey() and then GeneratePublicKey() */ + virtual void GenerateKeyPair(RandomNumberGenerator &rng, byte *privateKey, byte *publicKey) const; + //! derive agreed value from your private key and couterparty's public key, return false in case of failure + /*! \note If you have previously validated the public key, use validateOtherPublicKey=false to save time. + \pre size of agreedValue == AgreedValueLength() + \pre length of privateKey == PrivateKeyLength() + \pre length of otherPublicKey == PublicKeyLength() + */ + virtual bool Agree(byte *agreedValue, const byte *privateKey, const byte *otherPublicKey, bool validateOtherPublicKey=true) const =0; + +#ifdef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY + bool ValidateDomainParameters(RandomNumberGenerator &rng) const + {return GetCryptoParameters().Validate(rng, 2);} +#endif +}; + +//! interface for domains of authenticated key agreement protocols + +/*! In an authenticated key agreement protocol, each party has two + key pairs. The long-lived key pair is called the static key pair, + and the short-lived key pair is called the ephemeral key pair. +*/ +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE AuthenticatedKeyAgreementDomain : public KeyAgreementAlgorithm +{ +public: + //! return length of agreed value produced + virtual unsigned int AgreedValueLength() const =0; + + //! return length of static private keys in this domain + virtual unsigned int StaticPrivateKeyLength() const =0; + //! return length of static public keys in this domain + virtual unsigned int StaticPublicKeyLength() const =0; + //! generate static private key + /*! \pre size of privateKey == PrivateStaticKeyLength() */ + virtual void GenerateStaticPrivateKey(RandomNumberGenerator &rng, byte *privateKey) const =0; + //! generate static public key + /*! \pre size of publicKey == PublicStaticKeyLength() */ + virtual void GenerateStaticPublicKey(RandomNumberGenerator &rng, const byte *privateKey, byte *publicKey) const =0; + //! generate private/public key pair + /*! \note equivalent to calling GenerateStaticPrivateKey() and then GenerateStaticPublicKey() */ + virtual void GenerateStaticKeyPair(RandomNumberGenerator &rng, byte *privateKey, byte *publicKey) const; + + //! return length of ephemeral private keys in this domain + virtual unsigned int EphemeralPrivateKeyLength() const =0; + //! return length of ephemeral public keys in this domain + virtual unsigned int EphemeralPublicKeyLength() const =0; + //! generate ephemeral private key + /*! \pre size of privateKey == PrivateEphemeralKeyLength() */ + virtual void GenerateEphemeralPrivateKey(RandomNumberGenerator &rng, byte *privateKey) const =0; + //! generate ephemeral public key + /*! \pre size of publicKey == PublicEphemeralKeyLength() */ + virtual void GenerateEphemeralPublicKey(RandomNumberGenerator &rng, const byte *privateKey, byte *publicKey) const =0; + //! generate private/public key pair + /*! \note equivalent to calling GenerateEphemeralPrivateKey() and then GenerateEphemeralPublicKey() */ + virtual void GenerateEphemeralKeyPair(RandomNumberGenerator &rng, byte *privateKey, byte *publicKey) const; + + //! derive agreed value from your private keys and couterparty's public keys, return false in case of failure + /*! \note The ephemeral public key will always be validated. + If you have previously validated the static public key, use validateStaticOtherPublicKey=false to save time. + \pre size of agreedValue == AgreedValueLength() + \pre length of staticPrivateKey == StaticPrivateKeyLength() + \pre length of ephemeralPrivateKey == EphemeralPrivateKeyLength() + \pre length of staticOtherPublicKey == StaticPublicKeyLength() + \pre length of ephemeralOtherPublicKey == EphemeralPublicKeyLength() + */ + virtual bool Agree(byte *agreedValue, + const byte *staticPrivateKey, const byte *ephemeralPrivateKey, + const byte *staticOtherPublicKey, const byte *ephemeralOtherPublicKey, + bool validateStaticOtherPublicKey=true) const =0; + +#ifdef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY + bool ValidateDomainParameters(RandomNumberGenerator &rng) const + {return GetCryptoParameters().Validate(rng, 2);} +#endif +}; + +// interface for password authenticated key agreement protocols, not implemented yet +#if 0 +//! interface for protocol sessions +/*! The methods should be called in the following order: + + InitializeSession(rng, parameters); // or call initialize method in derived class + while (true) + { + if (OutgoingMessageAvailable()) + { + length = GetOutgoingMessageLength(); + GetOutgoingMessage(message); + ; // send outgoing message + } + + if (LastMessageProcessed()) + break; + + ; // receive incoming message + ProcessIncomingMessage(message); + } + ; // call methods in derived class to obtain result of protocol session +*/ +class ProtocolSession +{ +public: + //! exception thrown when an invalid protocol message is processed + class ProtocolError : public Exception + { + public: + ProtocolError(ErrorType errorType, const std::string &s) : Exception(errorType, s) {} + }; + + //! exception thrown when a function is called unexpectedly + /*! for example calling ProcessIncomingMessage() when ProcessedLastMessage() == true */ + class UnexpectedMethodCall : public Exception + { + public: + UnexpectedMethodCall(const std::string &s) : Exception(OTHER_ERROR, s) {} + }; + + ProtocolSession() : m_rng(NULL), m_throwOnProtocolError(true), m_validState(false) {} + virtual ~ProtocolSession() {} + + virtual void InitializeSession(RandomNumberGenerator &rng, const NameValuePairs ¶meters) =0; + + bool GetThrowOnProtocolError() const {return m_throwOnProtocolError;} + void SetThrowOnProtocolError(bool throwOnProtocolError) {m_throwOnProtocolError = throwOnProtocolError;} + + bool HasValidState() const {return m_validState;} + + virtual bool OutgoingMessageAvailable() const =0; + virtual unsigned int GetOutgoingMessageLength() const =0; + virtual void GetOutgoingMessage(byte *message) =0; + + virtual bool LastMessageProcessed() const =0; + virtual void ProcessIncomingMessage(const byte *message, unsigned int messageLength) =0; + +protected: + void HandleProtocolError(Exception::ErrorType errorType, const std::string &s) const; + void CheckAndHandleInvalidState() const; + void SetValidState(bool valid) {m_validState = valid;} + + RandomNumberGenerator *m_rng; + +private: + bool m_throwOnProtocolError, m_validState; +}; + +class KeyAgreementSession : public ProtocolSession +{ +public: + virtual unsigned int GetAgreedValueLength() const =0; + virtual void GetAgreedValue(byte *agreedValue) const =0; +}; + +class PasswordAuthenticatedKeyAgreementSession : public KeyAgreementSession +{ +public: + void InitializePasswordAuthenticatedKeyAgreementSession(RandomNumberGenerator &rng, + const byte *myId, unsigned int myIdLength, + const byte *counterPartyId, unsigned int counterPartyIdLength, + const byte *passwordOrVerifier, unsigned int passwordOrVerifierLength); +}; + +class PasswordAuthenticatedKeyAgreementDomain : public KeyAgreementAlgorithm +{ +public: + //! return whether the domain parameters stored in this object are valid + virtual bool ValidateDomainParameters(RandomNumberGenerator &rng) const + {return GetCryptoParameters().Validate(rng, 2);} + + virtual unsigned int GetPasswordVerifierLength(const byte *password, unsigned int passwordLength) const =0; + virtual void GeneratePasswordVerifier(RandomNumberGenerator &rng, const byte *userId, unsigned int userIdLength, const byte *password, unsigned int passwordLength, byte *verifier) const =0; + + enum RoleFlags {CLIENT=1, SERVER=2, INITIATOR=4, RESPONDER=8}; + + virtual bool IsValidRole(unsigned int role) =0; + virtual PasswordAuthenticatedKeyAgreementSession * CreateProtocolSession(unsigned int role) const =0; +}; +#endif + +//! BER Decode Exception Class, may be thrown during an ASN1 BER decode operation +class CRYPTOPP_DLL BERDecodeErr : public InvalidArgument +{ +public: + BERDecodeErr() : InvalidArgument("BER decode error") {} + BERDecodeErr(const std::string &s) : InvalidArgument(s) {} +}; + +//! interface for encoding and decoding ASN1 objects +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE ASN1Object +{ +public: + virtual ~ASN1Object() {} + //! decode this object from a BufferedTransformation, using BER (Basic Encoding Rules) + virtual void BERDecode(BufferedTransformation &bt) =0; + //! encode this object into a BufferedTransformation, using DER (Distinguished Encoding Rules) + virtual void DEREncode(BufferedTransformation &bt) const =0; + //! encode this object into a BufferedTransformation, using BER + /*! this may be useful if DEREncode() would be too inefficient */ + virtual void BEREncode(BufferedTransformation &bt) const {DEREncode(bt);} +}; + +#ifdef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY +typedef PK_SignatureScheme PK_SignatureSystem; +typedef SimpleKeyAgreementDomain PK_SimpleKeyAgreementDomain; +typedef AuthenticatedKeyAgreementDomain PK_AuthenticatedKeyAgreementDomain; +#endif + +NAMESPACE_END + +#endif |