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korayakov
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Файл:Документация по криптоалгоритмам / CRYPTO30 / dsa
.h#ifndef CRYPTOPP_DSA_H
#define CRYPTOPP_DSA_H
#include "pubkey.h"
#include "modexppc.h"
#include "sha.h"
NAMESPACE_BEGIN(CryptoPP)
const int MIN_DSA_PRIME_LENGTH = 512;
const int MAX_DSA_PRIME_LENGTH = 1024;
// both seedLength and primeLength are in bits, but seedLength should
// be a multiple of 8
bool GenerateDSAPrimes(byte *seed, unsigned int seedLength, int &counter,
Integer &p, unsigned int primeLength, Integer &q);
class DSABase : virtual public PK_Precomputation, virtual public DigestSignatureSystem
{
public:
void Precompute(unsigned int precomputationStorage=16);
void LoadPrecomputation(BufferedTransformation &storedPrecomputation);
void SavePrecomputation(BufferedTransformation &storedPrecomputation) const;
unsigned int MaxDigestLength() const {return UINT_MAX;}
unsigned int DigestSignatureLength() const {return 2*q.ByteCount();}
protected:
DSABase() {}
DSABase(const Integer &p, const Integer &q, const Integer &g, const Integer &y);
Integer EncodeDigest(const byte *digest, unsigned int digestLen) const;
Integer p, q, g, y;
ModExpPrecomputation gpc, ypc;
};
class SHA;
class DSAPrivateKey : public DSABase, public SignerTemplate<DigestSigner, SHA>, public PK_WithPrecomputation<PK_Signer>
{
public:
DSAPrivateKey(const Integer &p, const Integer &q, const Integer &g, const Integer &y, const Integer &x);
// generate a random private key
DSAPrivateKey(RandomNumberGenerator &rng, unsigned int keybits);
// generate a random private key, given p, q, and g
DSAPrivateKey(RandomNumberGenerator &rng, const Integer &p, const Integer &q, const Integer &g);
// load a previously generated key
DSAPrivateKey(BufferedTransformation &storedKey);
void DEREncode(BufferedTransformation &bt) const;
void SignDigest(RandomNumberGenerator &rng, const byte *digest, unsigned int digestLen, byte *signature) const;
// exposed for validation testing
void RawSign(const Integer &k, const Integer &h, Integer &r, Integer &s) const;
protected:
Integer x;
};
class DSAPublicKey : public DSABase, public VerifierTemplate<DigestVerifier, SHA>, public PK_WithPrecomputation<PK_Verifier>
{
public:
DSAPublicKey(const Integer &p, const Integer &q, const Integer &g, const Integer &y);
// create a matching public key from a private key
DSAPublicKey(const DSAPrivateKey &priv);
// load a previously generated key
DSAPublicKey(BufferedTransformation &storedKey);
void DEREncode(BufferedTransformation &bt) const;
bool VerifyDigest(const byte *digest, unsigned int digestLen, const byte *signature) const;
// exposed for validation testing
bool RawVerify(const Integer &h, const Integer &r, const Integer &s) const;
};
NAMESPACE_END
#endif
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