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Andrey K. Choi
2025-10-09 09:57:24 +09:00
commit 4d551bd74f
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output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Crypto/Agreement/ECMqvBasicAgreement.cs Normal file
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using System;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Math.EC;
namespace Org.BouncyCastle.Crypto.Agreement;
public class ECMqvBasicAgreement : IBasicAgreement
{
protected internal MqvPrivateParameters privParams;
public virtual void Init(ICipherParameters parameters)
{
if (parameters is ParametersWithRandom)
{
parameters = ((ParametersWithRandom)parameters).Parameters;
}
privParams = (MqvPrivateParameters)parameters;
}
public virtual int GetFieldSize()
{
return (privParams.StaticPrivateKey.Parameters.Curve.FieldSize + 7) / 8;
}
public virtual BigInteger CalculateAgreement(ICipherParameters pubKey)
{
MqvPublicParameters mqvPublicParameters = (MqvPublicParameters)pubKey;
ECPrivateKeyParameters staticPrivateKey = privParams.StaticPrivateKey;
ECDomainParameters parameters = staticPrivateKey.Parameters;
if (!parameters.Equals(mqvPublicParameters.StaticPublicKey.Parameters))
{
throw new InvalidOperationException("ECMQV public key components have wrong domain parameters");
}
ECPoint eCPoint = CalculateMqvAgreement(parameters, staticPrivateKey, privParams.EphemeralPrivateKey, privParams.EphemeralPublicKey, mqvPublicParameters.StaticPublicKey, mqvPublicParameters.EphemeralPublicKey).Normalize();
if (eCPoint.IsInfinity)
{
throw new InvalidOperationException("Infinity is not a valid agreement value for MQV");
}
return eCPoint.AffineXCoord.ToBigInteger();
}
private static ECPoint CalculateMqvAgreement(ECDomainParameters parameters, ECPrivateKeyParameters d1U, ECPrivateKeyParameters d2U, ECPublicKeyParameters Q2U, ECPublicKeyParameters Q1V, ECPublicKeyParameters Q2V)
{
BigInteger n = parameters.N;
int num = (n.BitLength + 1) / 2;
BigInteger m = BigInteger.One.ShiftLeft(num);
ECCurve curve = parameters.Curve;
ECPoint eCPoint = ECAlgorithms.CleanPoint(curve, Q2U.Q);
ECPoint p = ECAlgorithms.CleanPoint(curve, Q1V.Q);
ECPoint eCPoint2 = ECAlgorithms.CleanPoint(curve, Q2V.Q);
BigInteger bigInteger = eCPoint.AffineXCoord.ToBigInteger();
BigInteger bigInteger2 = bigInteger.Mod(m);
BigInteger val = bigInteger2.SetBit(num);
BigInteger val2 = d1U.D.Multiply(val).Add(d2U.D).Mod(n);
BigInteger bigInteger3 = eCPoint2.AffineXCoord.ToBigInteger();
BigInteger bigInteger4 = bigInteger3.Mod(m);
BigInteger bigInteger5 = bigInteger4.SetBit(num);
BigInteger bigInteger6 = parameters.H.Multiply(val2).Mod(n);
return ECAlgorithms.SumOfTwoMultiplies(p, bigInteger5.Multiply(bigInteger6).Mod(n), eCPoint2, bigInteger6);
}
}