mirror of
https://github.com/shadps4-emu/ext-cryptopp.git
synced 2024-11-23 18:09:48 +00:00
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
|
|
|
|
/// \file pssr.h
|
|
/// \brief Classes for probablistic signature schemes
|
|
/// \since Crypto++ 2.1
|
|
|
|
#ifndef CRYPTOPP_PSSR_H
|
|
#define CRYPTOPP_PSSR_H
|
|
|
|
#include "cryptlib.h"
|
|
#include "pubkey.h"
|
|
#include "emsa2.h"
|
|
|
|
#ifdef CRYPTOPP_IS_DLL
|
|
#include "sha.h"
|
|
#endif
|
|
|
|
NAMESPACE_BEGIN(CryptoPP)
|
|
|
|
/// \brief PSSR Message Encoding Method interface
|
|
/// \since Crypto++ 2.1
|
|
class CRYPTOPP_DLL PSSR_MEM_Base : public PK_RecoverableSignatureMessageEncodingMethod
|
|
{
|
|
public:
|
|
virtual ~PSSR_MEM_Base() {}
|
|
|
|
protected:
|
|
virtual bool AllowRecovery() const =0;
|
|
virtual size_t SaltLen(size_t hashLen) const =0;
|
|
virtual size_t MinPadLen(size_t hashLen) const =0;
|
|
virtual const MaskGeneratingFunction & GetMGF() const =0;
|
|
|
|
private:
|
|
size_t MinRepresentativeBitLength(size_t hashIdentifierLength, size_t digestLength) const;
|
|
size_t MaxRecoverableLength(size_t representativeBitLength, size_t hashIdentifierLength, size_t digestLength) const;
|
|
bool IsProbabilistic() const;
|
|
bool AllowNonrecoverablePart() const;
|
|
bool RecoverablePartFirst() const;
|
|
void ComputeMessageRepresentative(RandomNumberGenerator &rng,
|
|
const byte *recoverableMessage, size_t recoverableMessageLength,
|
|
HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
|
|
byte *representative, size_t representativeBitLength) const;
|
|
DecodingResult RecoverMessageFromRepresentative(
|
|
HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
|
|
byte *representative, size_t representativeBitLength,
|
|
byte *recoverableMessage) const;
|
|
};
|
|
|
|
/// \brief PSSR Message Encoding Method with Hash Identifier
|
|
/// \tparam USE_HASH_ID flag indicating whether the HashId is used
|
|
/// \since Crypto++ 2.1
|
|
template <bool USE_HASH_ID> class PSSR_MEM_BaseWithHashId;
|
|
|
|
/// \brief PSSR Message Encoding Method with Hash Identifier
|
|
/// \details If USE_HASH_ID is true, then EMSA2HashIdLookup<PSSR_MEM_Base> is used for the base class
|
|
template<> class PSSR_MEM_BaseWithHashId<true> : public EMSA2HashIdLookup<PSSR_MEM_Base> {};
|
|
|
|
/// \brief PSSR Message Encoding Method without Hash Identifier
|
|
/// \details If USE_HASH_ID is false, then PSSR_MEM_Base is used for the base class
|
|
/// \since Crypto++ 2.1
|
|
template<> class PSSR_MEM_BaseWithHashId<false> : public PSSR_MEM_Base {};
|
|
|
|
/// \brief PSSR Message Encoding Method
|
|
/// \tparam ALLOW_RECOVERY flag indicating whether the scheme provides message recovery
|
|
/// \tparam MGF mask generation function
|
|
/// \tparam SALT_LEN length of the salt
|
|
/// \tparam MIN_PAD_LEN minimum length of the pad
|
|
/// \tparam USE_HASH_ID flag indicating whether the HashId is used
|
|
/// \details If ALLOW_RECOVERY is true, the the signature scheme provides message recovery. If
|
|
/// ALLOW_RECOVERY is false, the the signature scheme is appendix, and the message must be
|
|
/// provided during verification.
|
|
/// \since Crypto++ 2.1
|
|
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 size_t SaltLen(size_t hashLen) const {return SALT_LEN < 0 ? hashLen : SALT_LEN;}
|
|
virtual size_t MinPadLen(size_t 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 CRYPTOPP_API StaticAlgorithmName() {return std::string(ALLOW_RECOVERY ? "PSSR-" : "PSS-") + MGF::StaticAlgorithmName();}
|
|
};
|
|
|
|
/// \brief Probabilistic Signature Scheme with Recovery
|
|
/// \details Signature Schemes with Recovery encode the message with the signature.
|
|
/// \sa <a href="http://www.weidai.com/scan-mirror/sig.html#sem_PSSR-MGF1">PSSR-MGF1</a>
|
|
/// \since Crypto++ 2.1
|
|
struct PSSR : public SignatureStandard
|
|
{
|
|
typedef PSSR_MEM<true> SignatureMessageEncodingMethod;
|
|
};
|
|
|
|
/// \brief Probabilistic Signature Scheme with Appendix
|
|
/// \details Signature Schemes with Appendix require the message to be provided during verification.
|
|
/// \sa <a href="http://www.weidai.com/scan-mirror/sig.html#sem_PSS-MGF1">PSS-MGF1</a>
|
|
/// \since Crypto++ 2.1
|
|
struct PSS : public SignatureStandard
|
|
{
|
|
typedef PSSR_MEM<false> SignatureMessageEncodingMethod;
|
|
};
|
|
|
|
NAMESPACE_END
|
|
|
|
#endif
|