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dh.h

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#ifndef CRYPTOPP_DH_H
#define CRYPTOPP_DH_H

#include "modexppc.h"

NAMESPACE_BEGIN(CryptoPP)

class DH : public PK_WithPrecomputation<PK_SimpleKeyAgreementDomain>
{
public:
        DH(const Integer &p, const Integer &g);
        DH(RandomNumberGenerator &rng, unsigned int pbits);
        DH(BufferedTransformation &domainParams);

        void DEREncode(BufferedTransformation &domainParams) const;

        void Precompute(unsigned int precomputationStorage=16);
        void LoadPrecomputation(BufferedTransformation &storedPrecomputation);
        void SavePrecomputation(BufferedTransformation &storedPrecomputation) const;

        bool ValidateDomainParameters(RandomNumberGenerator &rng) const;
        unsigned int AgreedValueLength() const {return p.ByteCount();}
        unsigned int PrivateKeyLength() const {return p.ByteCount();}
        unsigned int PublicKeyLength() const {return p.ByteCount();}

        void GenerateKeyPair(RandomNumberGenerator &rng, byte *privateKey, byte *publicKey) const;
        bool Agree(byte *agreedValue, const byte *privateKey, const byte *otherPublicKey, bool validateOtherPublicKey=true) const;

        const Integer &GetPrime() const {return p;}
        const Integer &GetGenerator() const {return g;}

private:
        unsigned int ExponentBitLength() const;

        Integer p, g;
        ModExpPrecomputation gpc;
};

NAMESPACE_END

#endif

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