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# pssr.h

    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 //! <a href="http://www.weidai.com/scan-mirror/sig.html#sem_PSSR-MGF1">PSSR-MGF1</a>
    00053 struct PSSR : public SignatureStandard
    00054 {
    00055         typedef PSSR_MEM<true> SignatureMessageEncodingMethod;
    00056 };
    00057
    00058 //! <a href="http://www.weidai.com/scan-mirror/sig.html#sem_PSS-MGF1">PSS-MGF1</a>
    00059 struct PSS : public SignatureStandard
    00060 {
    00061         typedef PSSR_MEM<false> SignatureMessageEncodingMethod;
    00062 };
    00063
    00064 NAMESPACE_END
    00065
    00066 #endif