00001 #ifndef CRYPTOPP_PSSR_H
00002 #define CRYPTOPP_PSSR_H
00003
00004 #include "pubkey.h"
00005 #include <functional>
00006
00007 NAMESPACE_BEGIN(CryptoPP)
00008
00009 class PSSR_MEM_Base : public PK_RecoverableSignatureMessageEncodingMethod
00010 {
00011 virtual bool AllowRecovery() const =0;
00012 virtual unsigned int SaltLen(unsigned int hashLen) const =0;
00013 virtual unsigned int MinPadLen(unsigned int hashLen) const =0;
00014 virtual const MaskGeneratingFunction & GetMGF() const =0;
00015
00016 public:
00017 unsigned int MaxRecoverableLength(unsigned int representativeBitLength, unsigned int hashIdentifierLength, unsigned int digestLength) const;
00018 bool IsProbabilistic() const;
00019 bool AllowNonrecoverablePart() const;
00020 bool RecoverablePartFirst() const;
00021 void ComputeMessageRepresentative(RandomNumberGenerator &rng,
00022 const byte *recoverableMessage, unsigned int recoverableMessageLength,
00023 HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
00024 byte *representative, unsigned int representativeBitLength) const;
00025 DecodingResult RecoverMessageFromRepresentative(
00026 HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
00027 byte *representative, unsigned int representativeBitLength,
00028 byte *recoverableMessage) const;
00029 };
00030
00031 template <class H> struct EMSA2HashId
00032 {
00033 static const byte id;
00034 };
00035
00036
00037 class SHA;
00038 class RIPEMD160;
00039
00040 template <class BASE>
00041 class EMSA2HashIdLookup : public BASE
00042 {
00043 public:
00044 struct HashIdentifierLookup
00045 {
00046 template <class H> struct HashIdentifierLookup2
00047 {
00048 static HashIdentifier Lookup()
00049 {
00050 return HashIdentifier(&EMSA2HashId<H>::id, 1);
00051 }
00052 };
00053 };
00054 };
00055
00056 template <bool USE_HASH_ID> class PSSR_MEM_BaseWithHashId;
00057 template<> class PSSR_MEM_BaseWithHashId<true> : public EMSA2HashIdLookup<PSSR_MEM_Base> {};
00058 template<> class PSSR_MEM_BaseWithHashId<false> : public PSSR_MEM_Base {};
00059
00060 template <bool ALLOW_RECOVERY, class MGF=P1363_MGF1, int SALT_LEN=-1, int MIN_PAD_LEN=0, bool USE_HASH_ID=false>
00061 class PSSR_MEM : public PSSR_MEM_BaseWithHashId<USE_HASH_ID>
00062 {
00063 virtual bool AllowRecovery() const {return ALLOW_RECOVERY;}
00064 virtual unsigned int SaltLen(unsigned int hashLen) const {return SALT_LEN < 0 ? hashLen : SALT_LEN;}
00065 virtual unsigned int MinPadLen(unsigned int hashLen) const {return MIN_PAD_LEN < 0 ? hashLen : MIN_PAD_LEN;}
00066 virtual const MaskGeneratingFunction & GetMGF() const {static MGF mgf; return mgf;}
00067
00068 public:
00069 static std::string StaticAlgorithmName() {return std::string(ALLOW_RECOVERY ? "PSSR-" : "PSS-") + MGF::StaticAlgorithmName();}
00070 };
00071
00072
00073 struct PSSR : public SignatureStandard
00074 {
00075 typedef PSSR_MEM<true> SignatureMessageEncodingMethod;
00076 };
00077
00078
00079 struct PSS : public SignatureStandard
00080 {
00081 typedef PSSR_MEM<false> SignatureMessageEncodingMethod;
00082 };
00083
00084 NAMESPACE_END
00085
00086 #endif