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https://github.com/shadps4-emu/ext-cryptopp.git
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102 lines
2.9 KiB
C++
102 lines
2.9 KiB
C++
// emsa2.h - originally written and placed in the public domain by Wei Dai
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/// \file emsa2.h
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/// \brief Classes and functions for various padding schemes used in public key algorithms
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#ifndef CRYPTOPP_EMSA2_H
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#define CRYPTOPP_EMSA2_H
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#include "cryptlib.h"
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#include "pubkey.h"
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#include "hashfwd.h"
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#include "misc.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 EMSA2 hash identifier
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/// \tparam H HashTransformation derived class
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/// \since Crypto++ 5.0
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template <class H> class EMSA2HashId
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{
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public:
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static const byte id;
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};
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/// \brief EMSA2 padding method
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/// \tparam BASE Message encoding method
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/// \since Crypto++ 5.0
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template <class BASE>
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class EMSA2HashIdLookup : public BASE
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{
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public:
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struct HashIdentifierLookup
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{
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template <class H> struct HashIdentifierLookup2
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{
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static HashIdentifier Lookup()
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{
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return HashIdentifier(&EMSA2HashId<H>::id, 1);
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}
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};
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};
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};
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// EMSA2HashId can be instantiated with the following classes.
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// SHA1, SHA224, SHA256, SHA384, SHA512, RIPEMD128, RIPEMD160, Whirlpool
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#ifdef CRYPTOPP_IS_DLL
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CRYPTOPP_DLL_TEMPLATE_CLASS EMSA2HashId<SHA1>;
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CRYPTOPP_DLL_TEMPLATE_CLASS EMSA2HashId<SHA224>;
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CRYPTOPP_DLL_TEMPLATE_CLASS EMSA2HashId<SHA256>;
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CRYPTOPP_DLL_TEMPLATE_CLASS EMSA2HashId<SHA384>;
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CRYPTOPP_DLL_TEMPLATE_CLASS EMSA2HashId<SHA512>;
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#endif
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// https://github.com/weidai11/cryptopp/issues/300 and
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// https://github.com/weidai11/cryptopp/issues/533
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#if defined(__clang__)
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template<> const byte EMSA2HashId<SHA1>::id;
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template<> const byte EMSA2HashId<SHA224>::id;
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template<> const byte EMSA2HashId<SHA256>::id;
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template<> const byte EMSA2HashId<SHA384>::id;
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template<> const byte EMSA2HashId<SHA512>::id;
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#endif
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/// \brief EMSA2 padding method
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/// \since Crypto++ 5.0
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class CRYPTOPP_DLL EMSA2Pad : public EMSA2HashIdLookup<PK_DeterministicSignatureMessageEncodingMethod>
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{
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public:
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CRYPTOPP_STATIC_CONSTEXPR const char* CRYPTOPP_API StaticAlgorithmName() {return "EMSA2";}
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size_t MinRepresentativeBitLength(size_t hashIdentifierLength, size_t digestLength) const
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{CRYPTOPP_UNUSED(hashIdentifierLength); return 8*digestLength + 31;}
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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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};
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// EMSA2, for use with RWSS and RSA_ISO
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// Only the following hash functions are supported by this signature standard:
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// \dontinclude emsa2.h
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// \skip EMSA2HashId can be instantiated
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// \until end of list
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/// \brief EMSA2/P1363 padding method
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/// \details Use with RWSS and RSA_ISO
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/// \since Crypto++ 5.0
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struct P1363_EMSA2 : public SignatureStandard
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{
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typedef EMSA2Pad SignatureMessageEncodingMethod;
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};
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NAMESPACE_END
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#endif
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