SM2KeyExchangePrivateParameters
Private parameters for an SM2 key exchange.
using Org.BouncyCastle.Math.EC;
using Org.BouncyCastle.Math.EC.Multiplier;
using System;
namespace Org.BouncyCastle.Crypto.Parameters
{
public class SM2KeyExchangePrivateParameters : ICipherParameters
{
private readonly bool mInitiator;
private readonly ECPrivateKeyParameters mStaticPrivateKey;
private readonly ECPoint mStaticPublicPoint;
private readonly ECPrivateKeyParameters mEphemeralPrivateKey;
private readonly ECPoint mEphemeralPublicPoint;
public virtual bool IsInitiator => mInitiator;
public virtual ECPrivateKeyParameters StaticPrivateKey => mStaticPrivateKey;
public virtual ECPoint StaticPublicPoint => mStaticPublicPoint;
public virtual ECPrivateKeyParameters EphemeralPrivateKey => mEphemeralPrivateKey;
public virtual ECPoint EphemeralPublicPoint => mEphemeralPublicPoint;
public SM2KeyExchangePrivateParameters(bool initiator, ECPrivateKeyParameters staticPrivateKey, ECPrivateKeyParameters ephemeralPrivateKey)
{
if (staticPrivateKey == null)
throw new ArgumentNullException("staticPrivateKey");
if (ephemeralPrivateKey == null)
throw new ArgumentNullException("ephemeralPrivateKey");
ECDomainParameters parameters = staticPrivateKey.Parameters;
if (!parameters.Equals(ephemeralPrivateKey.Parameters))
throw new ArgumentException("Static and ephemeral private keys have different domain parameters");
ECMultiplier eCMultiplier = new FixedPointCombMultiplier();
mInitiator = initiator;
mStaticPrivateKey = staticPrivateKey;
mStaticPublicPoint = eCMultiplier.Multiply(parameters.G, staticPrivateKey.D).Normalize();
mEphemeralPrivateKey = ephemeralPrivateKey;
mEphemeralPublicPoint = eCMultiplier.Multiply(parameters.G, ephemeralPrivateKey.D).Normalize();
}
}
}