106 lines
4.3 KiB
C++
106 lines
4.3 KiB
C++
// pssr.h - originally written and placed in the public domain by Wei Dai
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/// \file pssr.h
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/// \brief Classes for probabilistic signature schemes
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/// \since Crypto++ 2.1
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#ifndef CRYPTOPP_PSSR_H
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#define CRYPTOPP_PSSR_H
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#include "cryptlib.h"
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#include "pubkey.h"
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#include "emsa2.h"
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#ifdef CRYPTOPP_IS_DLL
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#include "sha.h"
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#endif
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NAMESPACE_BEGIN(CryptoPP)
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/// \brief PSSR Message Encoding Method interface
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/// \since Crypto++ 2.1
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class CRYPTOPP_DLL PSSR_MEM_Base : public PK_RecoverableSignatureMessageEncodingMethod
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{
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public:
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virtual ~PSSR_MEM_Base() {}
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protected:
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virtual bool AllowRecovery() const =0;
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virtual size_t SaltLen(size_t hashLen) const =0;
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virtual size_t MinPadLen(size_t hashLen) const =0;
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virtual const MaskGeneratingFunction & GetMGF() const =0;
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private:
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size_t MinRepresentativeBitLength(size_t hashIdentifierLength, size_t digestLength) const;
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size_t MaxRecoverableLength(size_t representativeBitLength, size_t hashIdentifierLength, size_t digestLength) const;
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bool IsProbabilistic() const;
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bool AllowNonrecoverablePart() const;
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bool RecoverablePartFirst() const;
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void ComputeMessageRepresentative(RandomNumberGenerator &rng,
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const byte *recoverableMessage, size_t recoverableMessageLength,
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HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
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byte *representative, size_t representativeBitLength) const;
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DecodingResult RecoverMessageFromRepresentative(
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HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
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byte *representative, size_t representativeBitLength,
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byte *recoverableMessage) const;
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};
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/// \brief PSSR Message Encoding Method with Hash Identifier
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/// \tparam USE_HASH_ID flag indicating whether the HashId is used
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/// \since Crypto++ 2.1
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template <bool USE_HASH_ID> class PSSR_MEM_BaseWithHashId;
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/// \brief PSSR Message Encoding Method with Hash Identifier
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/// \details If USE_HASH_ID is true, then EMSA2HashIdLookup<PSSR_MEM_Base> is used for the base class
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template<> class PSSR_MEM_BaseWithHashId<true> : public EMSA2HashIdLookup<PSSR_MEM_Base> {};
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/// \brief PSSR Message Encoding Method without Hash Identifier
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/// \details If USE_HASH_ID is false, then PSSR_MEM_Base is used for the base class
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/// \since Crypto++ 2.1
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template<> class PSSR_MEM_BaseWithHashId<false> : public PSSR_MEM_Base {};
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/// \brief PSSR Message Encoding Method
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/// \tparam ALLOW_RECOVERY flag indicating whether the scheme provides message recovery
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/// \tparam MGF mask generation function
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/// \tparam SALT_LEN length of the salt
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/// \tparam MIN_PAD_LEN minimum length of the pad
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/// \tparam USE_HASH_ID flag indicating whether the HashId is used
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/// \details If ALLOW_RECOVERY is true, the signature scheme provides message recovery. If
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/// ALLOW_RECOVERY is false, the signature scheme is appendix, and the message must be
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/// provided during verification.
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/// \since Crypto++ 2.1
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template <bool ALLOW_RECOVERY, class MGF=P1363_MGF1, int SALT_LEN=-1, int MIN_PAD_LEN=0, bool USE_HASH_ID=false>
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class PSSR_MEM : public PSSR_MEM_BaseWithHashId<USE_HASH_ID>
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{
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virtual bool AllowRecovery() const {return ALLOW_RECOVERY;}
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virtual size_t SaltLen(size_t hashLen) const {return SALT_LEN < 0 ? hashLen : SALT_LEN;}
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virtual size_t MinPadLen(size_t hashLen) const {return MIN_PAD_LEN < 0 ? hashLen : MIN_PAD_LEN;}
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virtual const MaskGeneratingFunction & GetMGF() const {static MGF mgf; return mgf;}
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public:
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static std::string CRYPTOPP_API StaticAlgorithmName() {return std::string(ALLOW_RECOVERY ? "PSSR-" : "PSS-") + MGF::StaticAlgorithmName();}
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};
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/// \brief Probabilistic Signature Scheme with Recovery
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/// \details Signature Schemes with Recovery encode the message with the signature.
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/// \sa <a href="http://www.weidai.com/scan-mirror/sig.html#sem_PSSR-MGF1">PSSR-MGF1</a>
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/// \since Crypto++ 2.1
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struct PSSR : public SignatureStandard
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{
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typedef PSSR_MEM<true> SignatureMessageEncodingMethod;
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};
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/// \brief Probabilistic Signature Scheme with Appendix
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/// \details Signature Schemes with Appendix require the message to be provided during verification.
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/// \sa <a href="http://www.weidai.com/scan-mirror/sig.html#sem_PSS-MGF1">PSS-MGF1</a>
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/// \since Crypto++ 2.1
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struct PSS : public SignatureStandard
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{
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typedef PSSR_MEM<false> SignatureMessageEncodingMethod;
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};
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NAMESPACE_END
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#endif
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