eckeypairgenerator.java

来自「进行与数字证书相关开发必须的java源码」· Java 代码 · 共 44 行

// Decompiled by Jad v1.5.7g. Copyright 2000 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/SiliconValley/Bridge/8617/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi 
// Source File Name:   ECKeyPairGenerator.java

package jit.crypto.generators;

import jit.crypto.*;
import jit.crypto.params.*;
import jit.math.BigInteger;
import jit.math.ec.ECConstants;
import jit.math.ec.ECPoint;
import jit.security.SecureRandom;

public class ECKeyPairGenerator
    implements AsymmetricCipherKeyPairGenerator, ECConstants
{

    ECDomainParameters params;
    SecureRandom random;

    public ECKeyPairGenerator()
    {
    }

    public void init(KeyGenerationParameters param)
    {
        ECKeyGenerationParameters ecP = (ECKeyGenerationParameters)param;
        random = ecP.getRandom();
        params = ecP.getDomainParameters();
    }

    public AsymmetricCipherKeyPair generateKeyPair()
    {
        BigInteger n = params.getN();
        BigInteger d;
        do
            d = new BigInteger(n.bitLength(), random);
        while(d.equals(ECConstants.ZERO) || d.compareTo(n) >= 0);
        ECPoint Q = params.getG().multiply(d);
        return new AsymmetricCipherKeyPair(new ECPublicKeyParameters(Q, params), new ECPrivateKeyParameters(d, params));
    }
}