jcersapublickey.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:   JCERSAPublicKey.java

package org.bouncycastle.jce.provider;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.math.BigInteger;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.RSAPublicKeySpec;
import org.bouncycastle.asn1.*;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.*;
import org.bouncycastle.crypto.params.RSAKeyParameters;

public class JCERSAPublicKey
	implements RSAPublicKey
{

	private BigInteger modulus;
	private BigInteger publicExponent;

	JCERSAPublicKey(RSAKeyParameters key)
	{
		modulus = key.getModulus();
		publicExponent = key.getExponent();
	}

	JCERSAPublicKey(RSAPublicKeySpec spec)
	{
		modulus = spec.getModulus();
		publicExponent = spec.getPublicExponent();
	}

	JCERSAPublicKey(RSAPublicKey key)
	{
		modulus = key.getModulus();
		publicExponent = key.getPublicExponent();
	}

	JCERSAPublicKey(SubjectPublicKeyInfo info)
	{
		try
		{
			RSAPublicKeyStructure pubKey = new RSAPublicKeyStructure((ASN1Sequence)info.getPublicKey());
			modulus = pubKey.getModulus();
			publicExponent = pubKey.getPublicExponent();
		}
		catch (IOException e)
		{
			throw new IllegalArgumentException("invalid info structure in RSA public key");
		}
	}

	public BigInteger getModulus()
	{
		return modulus;
	}

	public BigInteger getPublicExponent()
	{
		return publicExponent;
	}

	public String getAlgorithm()
	{
		return "RSA";
	}

	public String getFormat()
	{
		return "X.509";
	}

	public byte[] getEncoded()
	{
		ByteArrayOutputStream bOut = new ByteArrayOutputStream();
		DEROutputStream dOut = new DEROutputStream(bOut);
		SubjectPublicKeyInfo info = new SubjectPublicKeyInfo(new AlgorithmIdentifier(PKCSObjectIdentifiers.rsaEncryption, new DERNull()), (new RSAPublicKeyStructure(getModulus(), getPublicExponent())).getDERObject());
		try
		{
			dOut.writeObject(info);
			dOut.close();
		}
		catch (IOException e)
		{
			throw new RuntimeException("Error encoding RSA public key");
		}
		return bOut.toByteArray();
	}

	public boolean equals(Object o)
	{
		if (!(o instanceof RSAPublicKey))
			return false;
		if (o == this)
		{
			return true;
		} else
		{
			RSAPublicKey key = (RSAPublicKey)o;
			return getModulus().equals(key.getModulus()) && getPublicExponent().equals(key.getPublicExponent());
		}
	}

	public String toString()
	{
		StringBuffer buf = new StringBuffer();
		String nl = System.getProperty("line.separator");
		buf.append((new StringBuilder()).append("RSA Public Key").append(nl).toString());
		buf.append((new StringBuilder()).append("            modulus: ").append(getModulus().toString(16)).append(nl).toString());
		buf.append((new StringBuilder()).append("    public exponent: ").append(getPublicExponent().toString(16)).append(nl).toString());
		return buf.toString();
	}
}