00001 #ifndef CRYPTOPP_PSSR_H
00002 #define CRYPTOPP_PSSR_H
00003
00004 #include "pubkey.h"
00005 #include "emsa2.h"
00006
00007 #ifdef CRYPTOPP_IS_DLL
00008 #include "sha.h"
00009 #endif
00010
00011 NAMESPACE_BEGIN(CryptoPP)
00012
00013 class CRYPTOPP_DLL PSSR_MEM_Base : public PK_RecoverableSignatureMessageEncodingMethod
00014 {
00015 virtual bool AllowRecovery() const =0;
00016 virtual size_t SaltLen(size_t hashLen) const =0;
00017 virtual size_t MinPadLen(size_t hashLen) const =0;
00018 virtual const MaskGeneratingFunction & GetMGF() const =0;
00019
00020 public:
00021 size_t MinRepresentativeBitLength(size_t hashIdentifierLength, size_t digestLength) const;
00022 size_t MaxRecoverableLength(size_t representativeBitLength, size_t hashIdentifierLength, size_t digestLength) const;
00023 bool IsProbabilistic() const;
00024 bool AllowNonrecoverablePart() const;
00025 bool RecoverablePartFirst() const;
00026 void ComputeMessageRepresentative(RandomNumberGenerator &rng,
00027 const byte *recoverableMessage, size_t recoverableMessageLength,
00028 HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
00029 byte *representative, size_t representativeBitLength) const;
00030 DecodingResult RecoverMessageFromRepresentative(
00031 HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
00032 byte *representative, size_t representativeBitLength,
00033 byte *recoverableMessage) const;
00034 };
00035
00036 template <bool USE_HASH_ID> class PSSR_MEM_BaseWithHashId;
00037 template<> class PSSR_MEM_BaseWithHashId<true> : public EMSA2HashIdLookup<PSSR_MEM_Base> {};
00038 template<> class PSSR_MEM_BaseWithHashId<false> : public PSSR_MEM_Base {};
00039
00040 template <bool ALLOW_RECOVERY, class MGF=P1363_MGF1, int SALT_LEN=-1, int MIN_PAD_LEN=0, bool USE_HASH_ID=false>
00041 class PSSR_MEM : public PSSR_MEM_BaseWithHashId<USE_HASH_ID>
00042 {
00043 virtual bool AllowRecovery() const {return ALLOW_RECOVERY;}
00044 virtual size_t SaltLen(size_t hashLen) const {return SALT_LEN < 0 ? hashLen : SALT_LEN;}
00045 virtual size_t MinPadLen(size_t hashLen) const {return MIN_PAD_LEN < 0 ? hashLen : MIN_PAD_LEN;}
00046 virtual const MaskGeneratingFunction & GetMGF() const {static MGF mgf; return mgf;}
00047
00048 public:
00049 static std::string CRYPTOPP_API StaticAlgorithmName() {return std::string(ALLOW_RECOVERY ? "PSSR-" : "PSS-") + MGF::StaticAlgorithmName();}
00050 };
00051
00052
00053 struct PSSR : public SignatureStandard
00054 {
00055 typedef PSSR_MEM<true> SignatureMessageEncodingMethod;
00056 };
00057
00058
00059 struct PSS : public SignatureStandard
00060 {
00061 typedef PSSR_MEM<false> SignatureMessageEncodingMethod;
00062 };
00063
00064 NAMESPACE_END
00065
00066 #endif