pkcspad.h

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// pkcspad.h - written and placed in the public domain by Wei Dai


#ifndef CRYPTOPP_PKCSPAD_H
#define CRYPTOPP_PKCSPAD_H

#include "cryptlib.h"
#include "pubkey.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
class SHA1;
class SHA224;
class SHA256;
class SHA384;
class SHA512;
class Tiger;
class RIPEMD160;
namespace Weak1 {
class MD2;
class MD5;
}
// end of list

#ifdef 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>;
#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