dh2.cpp

// dh2.cpp - originally written and placed in the public domain by Wei Dai
 
#include "pch.h"
#include "cryptlib.h"
#include "misc.h"
#include "dh2.h"
 
NAMESPACE_BEGIN(CryptoPP)
 
#if defined(CRYPTOPP_DEBUG) && !defined(CRYPTOPP_DOXYGEN_PROCESSING)
struct NullCryptoParameters : public CryptoParameters
{
    void AssignFrom(const NameValuePairs &source) {
        CRYPTOPP_UNUSED(source);
    }
    bool Validate(RandomNumberGenerator &rng, unsigned int level) const {
        CRYPTOPP_UNUSED(rng); CRYPTOPP_UNUSED(level);
        return false;
    }
    bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const {
        CRYPTOPP_UNUSED(name); CRYPTOPP_UNUSED(valueType); CRYPTOPP_UNUSED(pValue);
        return false;
    }
};
 
struct NullSimpleKeyAgreementDomain : public TwoBases<NullCryptoParameters, SimpleKeyAgreementDomain>
{
    CryptoParameters & AccessCryptoParameters() {
        return *this;
    }
    unsigned int AgreedValueLength() const {
        return 1;
    }
    unsigned int PrivateKeyLength() const {
        return 1;
    }
    unsigned int PublicKeyLength() const {
        return 1;
    }
    void GeneratePrivateKey(RandomNumberGenerator &rng, byte *privateKey) const {
        CRYPTOPP_UNUSED(rng); CRYPTOPP_UNUSED(privateKey);
    }
    void GeneratePublicKey(RandomNumberGenerator &rng, const byte *privateKey, byte *publicKey) const {
        CRYPTOPP_UNUSED(rng); CRYPTOPP_UNUSED(privateKey); CRYPTOPP_UNUSED(publicKey);
    }
    bool Agree(byte *agreedValue, const byte *privateKey, const byte *otherPublicKey, bool validateOtherPublicKey=true) const {
        CRYPTOPP_UNUSED(agreedValue); CRYPTOPP_UNUSED(privateKey);
        CRYPTOPP_UNUSED(otherPublicKey); CRYPTOPP_UNUSED(validateOtherPublicKey);
        return false;
    }
};
 
void DH2_TestInstantiations()
{
    NullSimpleKeyAgreementDomain dom;
    DH2 dh(dom);
}
#endif
 
bool DH2::Agree(byte *agreedValue,
        const byte *staticSecretKey, const byte *ephemeralSecretKey,
        const byte *staticOtherPublicKey, const byte *ephemeralOtherPublicKey,
        bool validateStaticOtherPublicKey) const
{
    return d1.Agree(agreedValue, staticSecretKey, staticOtherPublicKey, validateStaticOtherPublicKey)
        && d2.Agree(agreedValue+d1.AgreedValueLength(), ephemeralSecretKey, ephemeralOtherPublicKey, true);
}
 
NAMESPACE_END