ecdhbasicagreement.java

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// Decompiled by Jad v1.5.8e2. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://kpdus.tripod.com/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi space 
// Source File Name:   ECDHBasicAgreement.java

package org.bouncycastle.crypto.agreement;

import java.math.BigInteger;
import org.bouncycastle.crypto.BasicAgreement;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.math.ec.ECFieldElement;
import org.bouncycastle.math.ec.ECPoint;

public class ECDHBasicAgreement
	implements BasicAgreement
{

	private ECPrivateKeyParameters key;

	public ECDHBasicAgreement()
	{
	}

	public void init(CipherParameters key)
	{
		this.key = (ECPrivateKeyParameters)key;
	}

	public BigInteger calculateAgreement(CipherParameters pubKey)
	{
		ECPublicKeyParameters pub = (ECPublicKeyParameters)pubKey;
		ECPoint P = pub.getQ().multiply(key.getD());
		return P.getX().toBigInteger();
	}
}