#ifndef CRYPTOPP_PSSR_H #define CRYPTOPP_PSSR_H #include "pubkey.h" #include "emsa2.h" #ifdef CRYPTOPP_IS_DLL #include "sha.h" #endif NAMESPACE_BEGIN(CryptoPP) class CRYPTOPP_DLL PSSR_MEM_Base : public PK_RecoverableSignatureMessageEncodingMethod { virtual bool AllowRecovery() const =0; virtual size_t SaltLen(size_t hashLen) const =0; virtual size_t MinPadLen(size_t hashLen) const =0; virtual const MaskGeneratingFunction & GetMGF() const =0; public: size_t MinRepresentativeBitLength(size_t hashIdentifierLength, size_t digestLength) const; size_t MaxRecoverableLength(size_t representativeBitLength, size_t hashIdentifierLength, size_t digestLength) const; bool IsProbabilistic() const; bool AllowNonrecoverablePart() const; bool RecoverablePartFirst() const; void ComputeMessageRepresentative(RandomNumberGenerator &rng, const byte *recoverableMessage, size_t recoverableMessageLength, HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty, byte *representative, size_t representativeBitLength) const; DecodingResult RecoverMessageFromRepresentative( HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty, byte *representative, size_t representativeBitLength, byte *recoverableMessage) const; }; template <bool USE_HASH_ID> class PSSR_MEM_BaseWithHashId; template<> class PSSR_MEM_BaseWithHashId<true> : public EMSA2HashIdLookup<PSSR_MEM_Base> {}; template<> class PSSR_MEM_BaseWithHashId<false> : public PSSR_MEM_Base {}; template <bool ALLOW_RECOVERY, class MGF=P1363_MGF1, int SALT_LEN=-1, int MIN_PAD_LEN=0, bool USE_HASH_ID=false> class PSSR_MEM : public PSSR_MEM_BaseWithHashId<USE_HASH_ID> { virtual bool AllowRecovery() const {return ALLOW_RECOVERY;} virtual size_t SaltLen(size_t hashLen) const {return SALT_LEN < 0 ? hashLen : SALT_LEN;} virtual size_t MinPadLen(size_t hashLen) const {return MIN_PAD_LEN < 0 ? hashLen : MIN_PAD_LEN;} virtual const MaskGeneratingFunction & GetMGF() const {static MGF mgf; return mgf;} public: static std::string CRYPTOPP_API StaticAlgorithmName() {return std::string(ALLOW_RECOVERY ? "PSSR-" : "PSS-") + MGF::StaticAlgorithmName();} }; //! <a href="http://www.weidai.com/scan-mirror/sig.html#sem_PSSR-MGF1">PSSR-MGF1</a> struct PSSR : public SignatureStandard { typedef PSSR_MEM<true> SignatureMessageEncodingMethod; }; //! <a href="http://www.weidai.com/scan-mirror/sig.html#sem_PSS-MGF1">PSS-MGF1</a> struct PSS : public SignatureStandard { typedef PSSR_MEM<false> SignatureMessageEncodingMethod; }; NAMESPACE_END #endif