org.bouncycastle.crypto.params.MQVPrivateParameters Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bcprov-ext-debug-jdk18on Show documentation

The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for Java 1.8 and later with debug enabled.

The newest version!

package org.bouncycastle.crypto.params;

import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.math.ec.FixedPointCombMultiplier;

public class MQVPrivateParameters
    implements CipherParameters
{
    private ECPrivateKeyParameters staticPrivateKey;
    private ECPrivateKeyParameters ephemeralPrivateKey;
    private ECPublicKeyParameters ephemeralPublicKey;

    public MQVPrivateParameters(
        ECPrivateKeyParameters  staticPrivateKey,
        ECPrivateKeyParameters  ephemeralPrivateKey)
    {
        this(staticPrivateKey, ephemeralPrivateKey, null);
    }

    public MQVPrivateParameters(
        ECPrivateKeyParameters  staticPrivateKey,
        ECPrivateKeyParameters  ephemeralPrivateKey,
        ECPublicKeyParameters   ephemeralPublicKey)
    {
        if (staticPrivateKey == null)
        {
            throw new NullPointerException("staticPrivateKey cannot be null");
        }
        if (ephemeralPrivateKey == null)
        {
            throw new NullPointerException("ephemeralPrivateKey cannot be null");
        }

        ECDomainParameters parameters = staticPrivateKey.getParameters();
        if (!parameters.equals(ephemeralPrivateKey.getParameters()))
        {
            throw new IllegalArgumentException("Static and ephemeral private keys have different domain parameters");
        }

        if (ephemeralPublicKey == null)
        {
            ECPoint q = new FixedPointCombMultiplier().multiply(parameters.getG(), ephemeralPrivateKey.getD());

            ephemeralPublicKey = new ECPublicKeyParameters(q, parameters);
        }
        else if (!parameters.equals(ephemeralPublicKey.getParameters()))
        {
            throw new IllegalArgumentException("Ephemeral public key has different domain parameters");
        }

        this.staticPrivateKey = staticPrivateKey;
        this.ephemeralPrivateKey = ephemeralPrivateKey;
        this.ephemeralPublicKey = ephemeralPublicKey;
    }

    public ECPrivateKeyParameters getStaticPrivateKey()
    {
        return staticPrivateKey;
    }

    public ECPrivateKeyParameters getEphemeralPrivateKey()
    {
        return ephemeralPrivateKey;
    }

    public ECPublicKeyParameters getEphemeralPublicKey()
    {
        return ephemeralPublicKey;
    }
}