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#ifndef CRYPTOPP_PSSR_H
#define CRYPTOPP_PSSR_H
#include "pubkey.h"
#include <functional>
#ifdef CRYPTOPP_IS_DLL
#include "sha.h"
#endif
NAMESPACE_BEGIN(CryptoPP)
class CRYPTOPP_DLL PSSR_MEM_Base : public PK_RecoverableSignatureMessageEncodingMethod
{
virtual bool AllowRecovery() const =0;
virtual unsigned int SaltLen(unsigned int hashLen) const =0;
virtual unsigned int MinPadLen(unsigned int hashLen) const =0;
virtual const MaskGeneratingFunction & GetMGF() const =0;
public:
unsigned int MaxRecoverableLength(unsigned int representativeBitLength, unsigned int hashIdentifierLength, unsigned int digestLength) const;
bool IsProbabilistic() const;
bool AllowNonrecoverablePart() const;
bool RecoverablePartFirst() const;
void ComputeMessageRepresentative(RandomNumberGenerator &rng,
const byte *recoverableMessage, unsigned int recoverableMessageLength,
HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
byte *representative, unsigned int representativeBitLength) const;
DecodingResult RecoverMessageFromRepresentative(
HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
byte *representative, unsigned int representativeBitLength,
byte *recoverableMessage) const;
};
template <class H> class EMSA2HashId
{
public:
static const byte id;
};
// EMSA2HashId can be instantiated with the following classes.
class SHA;
class RIPEMD160;
class RIPEMD128;
class SHA256;
class SHA384;
class SHA512;
class Whirlpool;
// end of list
#ifdef CRYPTOPP_IS_DLL
CRYPTOPP_DLL_TEMPLATE_CLASS EMSA2HashId<SHA>;
CRYPTOPP_DLL_TEMPLATE_CLASS EMSA2HashId<SHA256>;
CRYPTOPP_DLL_TEMPLATE_CLASS EMSA2HashId<SHA384>;
CRYPTOPP_DLL_TEMPLATE_CLASS EMSA2HashId<SHA512>;
#endif
template <class BASE>
class EMSA2HashIdLookup : public BASE
{
public:
struct HashIdentifierLookup
{
template <class H> struct HashIdentifierLookup2
{
static HashIdentifier Lookup()
{
return HashIdentifier(&EMSA2HashId<H>::id, 1);
}
};
};
};
template <bool USE_HASH_ID> class PSSR_MEM_BaseWithHashId;
template<> class PSSR_MEM_BaseWithHashId<true> : public EMSA2HashIdLookup<PSSR_MEM_Base> {};
template<> class PSSR_MEM_BaseWithHashId<false> : public PSSR_MEM_Base {};
template <bool ALLOW_RECOVERY, class MGF=P1363_MGF1, int SALT_LEN=-1, int MIN_PAD_LEN=0, bool USE_HASH_ID=false>
class PSSR_MEM : public PSSR_MEM_BaseWithHashId<USE_HASH_ID>
{
virtual bool AllowRecovery() const {return ALLOW_RECOVERY;}
virtual unsigned int SaltLen(unsigned int hashLen) const {return SALT_LEN < 0 ? hashLen : SALT_LEN;}
virtual unsigned int MinPadLen(unsigned int hashLen) const {return MIN_PAD_LEN < 0 ? hashLen : MIN_PAD_LEN;}
virtual const MaskGeneratingFunction & GetMGF() const {static MGF mgf; return mgf;}
public:
static std::string StaticAlgorithmName() {return std::string(ALLOW_RECOVERY ? "PSSR-" : "PSS-") + MGF::StaticAlgorithmName();}
};
//! <a href="http://www.weidai.com/scan-mirror/sig.html#sem_PSSR-MGF1">PSSR-MGF1</a>
struct PSSR : public SignatureStandard
{
typedef PSSR_MEM<true> SignatureMessageEncodingMethod;
};
//! <a href="http://www.weidai.com/scan-mirror/sig.html#sem_PSS-MGF1">PSS-MGF1</a>
struct PSS : public SignatureStandard
{
typedef PSSR_MEM<false> SignatureMessageEncodingMethod;
};
NAMESPACE_END
#endif
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