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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android. Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add an alternative (updated/complete) Bouncy Castle jar. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

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package org.spongycastle.crypto.params;

import org.spongycastle.crypto.CipherParameters;

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

    public ECPrivateKeyParameters getStaticPrivateKey()
    {
        return staticPrivateKey;
    }

    public ECPrivateKeyParameters getEphemeralPrivateKey()
    {
        return ephemeralPrivateKey;
    }

    public ECPublicKeyParameters getEphemeralPublicKey()
    {
        return ephemeralPublicKey;
    }
}