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// dh2.h - originally written and placed in the public domain by Wei Dai
/// \file dh2.h
/// \brief Classes for Unified Diffie-Hellman key exchange
/// \since Crypto++ 3.0
#ifndef CRYPTOPP_DH2_H
#define CRYPTOPP_DH2_H
#include "cryptlib.h"
NAMESPACE_BEGIN(CryptoPP)
/// \brief Unified Diffie-Hellman in GF(p)
/// \details A Diffie-Hellman domain is a set of parameters that must be shared
/// by two parties in a key agreement protocol, along with the algorithms
/// for generating key pairs and deriving agreed values.
/// \sa AuthenticatedKeyAgreementDomain, <a href="http://www.weidai.com/scan-mirror/ka.html#DH2">Unified Diffie-Hellman</a>
/// \since Crypto++ 3.0
class DH2 : public AuthenticatedKeyAgreementDomain
{
public:
virtual ~DH2() {}
/// \brief Construct a DH2
DH2(SimpleKeyAgreementDomain &domain)
: d1(domain), d2(domain) {}
/// \brief Construct a DH2
DH2(SimpleKeyAgreementDomain &staticDomain, SimpleKeyAgreementDomain &ephemeralDomain)
: d1(staticDomain), d2(ephemeralDomain) {}
CryptoParameters & AccessCryptoParameters() {return d1.AccessCryptoParameters();}
unsigned int AgreedValueLength() const
{return d1.AgreedValueLength() + d2.AgreedValueLength();}
unsigned int StaticPrivateKeyLength() const
{return d1.PrivateKeyLength();}
unsigned int StaticPublicKeyLength() const
{return d1.PublicKeyLength();}
void GenerateStaticPrivateKey(RandomNumberGenerator &rng, byte *privateKey) const
{d1.GeneratePrivateKey(rng, privateKey);}
void GenerateStaticPublicKey(RandomNumberGenerator &rng, const byte *privateKey, byte *publicKey) const
{d1.GeneratePublicKey(rng, privateKey, publicKey);}
void GenerateStaticKeyPair(RandomNumberGenerator &rng, byte *privateKey, byte *publicKey) const
{d1.GenerateKeyPair(rng, privateKey, publicKey);}
unsigned int EphemeralPrivateKeyLength() const
{return d2.PrivateKeyLength();}
unsigned int EphemeralPublicKeyLength() const
{return d2.PublicKeyLength();}
void GenerateEphemeralPrivateKey(RandomNumberGenerator &rng, byte *privateKey) const
{d2.GeneratePrivateKey(rng, privateKey);}
void GenerateEphemeralPublicKey(RandomNumberGenerator &rng, const byte *privateKey, byte *publicKey) const
{d2.GeneratePublicKey(rng, privateKey, publicKey);}
void GenerateEphemeralKeyPair(RandomNumberGenerator &rng, byte *privateKey, byte *publicKey) const
{d2.GenerateKeyPair(rng, privateKey, publicKey);}
bool Agree(byte *agreedValue,
const byte *staticPrivateKey, const byte *ephemeralPrivateKey,
const byte *staticOtherPublicKey, const byte *ephemeralOtherPublicKey,
bool validateStaticOtherPublicKey=true) const;
protected:
SimpleKeyAgreementDomain &d1, &d2;
};
NAMESPACE_END
#endif
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