dsautil.java

java 文件下载器。可自定义

// 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:   DSAUtil.java

package org.bouncycastle.jce.provider;

import java.security.*;
import java.security.interfaces.*;
import org.bouncycastle.crypto.params.*;

public class DSAUtil
{

	public DSAUtil()
	{
	}

	public static AsymmetricKeyParameter generatePublicKeyParameter(PublicKey key)
		throws InvalidKeyException
	{
		if (key instanceof DSAPublicKey)
		{
			DSAPublicKey k = (DSAPublicKey)key;
			return new DSAPublicKeyParameters(k.getY(), new DSAParameters(k.getParams().getP(), k.getParams().getQ(), k.getParams().getG()));
		} else
		{
			throw new InvalidKeyException((new StringBuilder()).append("can't identify DSA public key: ").append(key.getClass().getName()).toString());
		}
	}

	public static AsymmetricKeyParameter generatePrivateKeyParameter(PrivateKey key)
		throws InvalidKeyException
	{
		if (key instanceof DSAPrivateKey)
		{
			DSAPrivateKey k = (DSAPrivateKey)key;
			return new DSAPrivateKeyParameters(k.getX(), new DSAParameters(k.getParams().getP(), k.getParams().getQ(), k.getParams().getG()));
		} else
		{
			throw new InvalidKeyException("can't identify DSA private key.");
		}
	}
}