public MqvPrivateParameters(
ECPrivateKeyParameters staticPrivateKey,
ECPrivateKeyParameters ephemeralPrivateKey,
ECPublicKeyParameters ephemeralPublicKey)
{
this.staticPrivateKey = staticPrivateKey;
this.ephemeralPrivateKey = ephemeralPrivateKey;
this.ephemeralPublicKey = ephemeralPublicKey;
}
public virtual void Init(
ICipherParameters parameters)
{
if (parameters is ParametersWithRandom)
{
parameters = ((ParametersWithRandom) parameters).Parameters;
}
this.key = (ECPrivateKeyParameters)parameters;
}
// The ECMQV Primitive as described in SEC-1, 3.4
private static ECPoint CalculateMqvAgreement(
ECDomainParameters parameters,
ECPrivateKeyParameters d1U,
ECPrivateKeyParameters d2U,
ECPublicKeyParameters Q2U,
ECPublicKeyParameters Q1V,
ECPublicKeyParameters Q2V)
{
BigInteger n = parameters.N;
int e = (n.BitLength + 1) / 2;
BigInteger powE = BigInteger.One.ShiftLeft(e);
ECCurve curve = parameters.Curve;
ECPoint[] points = new ECPoint[]{
// The Q2U public key is optional
ECAlgorithms.ImportPoint(curve, Q2U == null ? parameters.G.Multiply(d2U.D) : Q2U.Q),
ECAlgorithms.ImportPoint(curve, Q1V.Q),
ECAlgorithms.ImportPoint(curve, Q2V.Q)
};
curve.NormalizeAll(points);
ECPoint q2u = points[0], q1v = points[1], q2v = points[2];
BigInteger x = q2u.AffineXCoord.ToBigInteger();
BigInteger xBar = x.Mod(powE);
BigInteger Q2UBar = xBar.SetBit(e);
BigInteger s = d1U.D.Multiply(Q2UBar).Add(d2U.D).Mod(n);
BigInteger xPrime = q2v.AffineXCoord.ToBigInteger();
BigInteger xPrimeBar = xPrime.Mod(powE);
BigInteger Q2VBar = xPrimeBar.SetBit(e);
BigInteger hs = parameters.H.Multiply(s).Mod(n);
return ECAlgorithms.SumOfTwoMultiplies(
q1v, Q2VBar.Multiply(hs).Mod(n), q2v, hs);
}
public MqvPrivateParameters(
ECPrivateKeyParameters staticPrivateKey,
ECPrivateKeyParameters ephemeralPrivateKey)
: this(staticPrivateKey, ephemeralPrivateKey, null)
{
}
protected bool Equals(
ECPrivateKeyParameters other)
{
return d.Equals(other.d) && base.Equals(other);
}
public void setPrivateKey(ECPrivateKeyParameters ecKey)
{
this.x = ecKey.D;
this.q = ecKey.Parameters.N;
this.curve = ecKey.Parameters;
qlen = q.BitLength;
if(q.SignValue <= 0 || qlen < 8)
{
throw new InvalidOperationException(
"bad group order: " + q);
}
rolen = (qlen + 7) >> 3;
rlen = rolen * 8;
bx = int2octets(x);
}
internal static ECPublicKeyParameters GetCorrespondingPublicKey(
ECPrivateKeyParameters privKey)
{
ECDomainParameters ec = privKey.Parameters;
ECPoint q = new FixedPointCombMultiplier().Multiply(ec.G, privKey.D);
if (privKey.PublicKeyParamSet != null)
{
return new ECPublicKeyParameters(privKey.AlgorithmName, q, privKey.PublicKeyParamSet);
}
return new ECPublicKeyParameters(privKey.AlgorithmName, q, ec);
}
