pkcspad.h

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// pkcspad.h - originally written and placed in the public domain by Wei Dai
 
 
#ifndef CRYPTOPP_PKCSPAD_H
#define CRYPTOPP_PKCSPAD_H
 
#include "cryptlib.h"
#include "pubkey.h"
#include "hashfwd.h"
 
#ifdef CRYPTOPP_IS_DLL
#include "sha.h"
#endif
 
NAMESPACE_BEGIN(CryptoPP)
 
 
class PKCS_EncryptionPaddingScheme : public PK_EncryptionMessageEncodingMethod
{
public:
        CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "EME-PKCS1-v1_5";}
 
        size_t MaxUnpaddedLength(size_t paddedLength) const;
        void Pad(RandomNumberGenerator &rng, const byte *raw, size_t inputLength, byte *padded, size_t paddedLength, const NameValuePairs &parameters) const;
        DecodingResult Unpad(const byte *padded, size_t paddedLength, byte *raw, const NameValuePairs &parameters) const;
};
 
template <class H> class PKCS_DigestDecoration
{
public:
        static const byte decoration[];
        static const unsigned int length;
};
 
// PKCS_DigestDecoration can be instantiated with the following
// classes as specified in PKCS #1 v2.0 and P1363a
// SHA1, SHA224, SHA256, SHA384, SHA512, Tiger, RIPEMD160, MD2, MD5
 
#if defined(CRYPTOPP_IS_DLL)
CRYPTOPP_DLL_TEMPLATE_CLASS PKCS_DigestDecoration<SHA1>;
CRYPTOPP_DLL_TEMPLATE_CLASS PKCS_DigestDecoration<SHA224>;
CRYPTOPP_DLL_TEMPLATE_CLASS PKCS_DigestDecoration<SHA256>;
CRYPTOPP_DLL_TEMPLATE_CLASS PKCS_DigestDecoration<SHA384>;
CRYPTOPP_DLL_TEMPLATE_CLASS PKCS_DigestDecoration<SHA512>;
// http://github.com/weidai11/cryptopp/issues/517
CRYPTOPP_DLL_TEMPLATE_CLASS PKCS_DigestDecoration<SHA3_256>;
CRYPTOPP_DLL_TEMPLATE_CLASS PKCS_DigestDecoration<SHA3_384>;
CRYPTOPP_DLL_TEMPLATE_CLASS PKCS_DigestDecoration<SHA3_512>;
#endif
 
// https://github.com/weidai11/cryptopp/issues/300 and
// https://github.com/weidai11/cryptopp/issues/533
#if defined(__clang__)
template<> const byte PKCS_DigestDecoration<SHA1>::decoration[];
template<> const unsigned int PKCS_DigestDecoration<SHA1>::length;
template<> const byte PKCS_DigestDecoration<SHA224>::decoration[];
template<> const unsigned int PKCS_DigestDecoration<SHA224>::length;
template<> const byte PKCS_DigestDecoration<SHA256>::decoration[];
template<> const unsigned int PKCS_DigestDecoration<SHA256>::length;
template<> const byte PKCS_DigestDecoration<SHA384>::decoration[];
template<> const unsigned int PKCS_DigestDecoration<SHA384>::length;
template<> const byte PKCS_DigestDecoration<SHA512>::decoration[];
template<> const unsigned int PKCS_DigestDecoration<SHA512>::length;
 
// http://github.com/weidai11/cryptopp/issues/517
template<> const byte PKCS_DigestDecoration<SHA3_256>::decoration[];
template<> const unsigned int PKCS_DigestDecoration<SHA3_256>::length;
template<> const byte PKCS_DigestDecoration<SHA3_384>::decoration[];
template<> const unsigned int PKCS_DigestDecoration<SHA3_384>::length;
template<> const byte PKCS_DigestDecoration<SHA3_512>::decoration[];
template<> const unsigned int PKCS_DigestDecoration<SHA3_512>::length;
 
template<> const byte PKCS_DigestDecoration<Weak1::MD2>::decoration[];
template<> const unsigned int PKCS_DigestDecoration<Weak1::MD2>::length;
template<> const byte PKCS_DigestDecoration<Weak1::MD5>::decoration[];
template<> const unsigned int PKCS_DigestDecoration<Weak1::MD5>::length;
#endif
 
class CRYPTOPP_DLL PKCS1v15_SignatureMessageEncodingMethod : public PK_DeterministicSignatureMessageEncodingMethod
{
public:
        CRYPTOPP_STATIC_CONSTEXPR const char* CRYPTOPP_API StaticAlgorithmName() {return "EMSA-PKCS1-v1_5";}
 
        size_t MinRepresentativeBitLength(size_t hashIdentifierSize, size_t digestSize) const
                {return 8 * (digestSize + hashIdentifierSize + 10);}
 
        void ComputeMessageRepresentative(RandomNumberGenerator &rng,
                const byte *recoverableMessage, size_t recoverableMessageLength,
                HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
                byte *representative, size_t representativeBitLength) const;
 
        struct HashIdentifierLookup
        {
                template <class H> struct HashIdentifierLookup2
                {
                        static HashIdentifier Lookup()
                        {
                                return HashIdentifier(PKCS_DigestDecoration<H>::decoration, PKCS_DigestDecoration<H>::length);
                        }
                };
        };
};
 
 
struct PKCS1v15 : public SignatureStandard, public EncryptionStandard
{
        typedef PKCS_EncryptionPaddingScheme EncryptionMessageEncodingMethod;
        typedef PKCS1v15_SignatureMessageEncodingMethod SignatureMessageEncodingMethod;
};
 
NAMESPACE_END
 
#endif