jceecpublickey.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:   JCEECPublicKey.java

package org.bouncycastle.jce.provider;

import java.io.*;
import java.math.BigInteger;
import org.bouncycastle.asn1.*;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.asn1.x9.*;
import org.bouncycastle.crypto.params.ECDomainParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.jce.interfaces.ECPublicKey;
import org.bouncycastle.jce.spec.*;
import org.bouncycastle.math.ec.ECFieldElement;
import org.bouncycastle.math.ec.ECPoint;

public class JCEECPublicKey
	implements ECPublicKey
{

	private String algorithm;
	private ECPoint q;
	private ECParameterSpec ecSpec;

	JCEECPublicKey(String algorithm, ECPublicKeySpec spec)
	{
		this.algorithm = "EC";
		this.algorithm = algorithm;
		q = spec.getQ();
		ecSpec = spec.getParams();
	}

	JCEECPublicKey(String algorithm, ECPublicKeyParameters params, ECParameterSpec spec)
	{
		this.algorithm = "EC";
		ECDomainParameters dp = params.getParameters();
		this.algorithm = algorithm;
		q = params.getQ();
		if (spec == null)
			ecSpec = new ECParameterSpec(dp.getCurve(), dp.getG(), dp.getN(), dp.getH(), dp.getSeed());
		else
			ecSpec = spec;
	}

	JCEECPublicKey(String algorithm, ECPublicKey key)
	{
		this.algorithm = "EC";
		q = key.getQ();
		this.algorithm = key.getAlgorithm();
		ecSpec = key.getParams();
	}

	JCEECPublicKey(String algorithm, ECPoint q, ECParameterSpec ecSpec)
	{
		this.algorithm = "EC";
		this.algorithm = algorithm;
		this.q = q;
		this.ecSpec = ecSpec;
	}

	JCEECPublicKey(SubjectPublicKeyInfo info)
	{
		algorithm = "EC";
		X962Parameters params = new X962Parameters((DERObject)info.getAlgorithmId().getParameters());
		if (params.isNamedCurve())
		{
			DERObjectIdentifier oid = (DERObjectIdentifier)params.getParameters();
			X9ECParameters ecP = X962NamedCurves.getByOID(oid);
			ecSpec = new ECNamedCurveParameterSpec(X962NamedCurves.getName(oid), ecP.getCurve(), ecP.getG(), ecP.getN(), ecP.getH(), ecP.getSeed());
		} else
		{
			X9ECParameters ecP = new X9ECParameters((ASN1Sequence)params.getParameters());
			ecSpec = new ECParameterSpec(ecP.getCurve(), ecP.getG(), ecP.getN(), ecP.getH(), ecP.getSeed());
		}
		DERBitString bits = info.getPublicKeyData();
		byte data[] = bits.getBytes();
		ASN1OctetString key = new DEROctetString(data);
		if (data[0] == 4 && data[1] == data.length - 2 && (data[2] == 2 || data[2] == 3))
			try
			{
				ByteArrayInputStream bIn = new ByteArrayInputStream(data);
				DERInputStream dIn = new DERInputStream(bIn);
				key = (ASN1OctetString)dIn.readObject();
			}
			catch (IOException ex)
			{
				throw new IllegalArgumentException("error recovering public key");
			}
		X9ECPoint derQ = new X9ECPoint(ecSpec.getCurve(), key);
		q = derQ.getPoint();
	}

	public String getAlgorithm()
	{
		return algorithm;
	}

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

	public byte[] getEncoded()
	{
		ByteArrayOutputStream bOut = new ByteArrayOutputStream();
		DEROutputStream dOut = new DEROutputStream(bOut);
		X962Parameters params = null;
		if (ecSpec instanceof ECNamedCurveParameterSpec)
		{
			params = new X962Parameters(X962NamedCurves.getOID(((ECNamedCurveParameterSpec)ecSpec).getName()));
		} else
		{
			X9ECParameters ecP = new X9ECParameters(ecSpec.getCurve(), ecSpec.getG(), ecSpec.getN(), ecSpec.getH(), ecSpec.getSeed());
			params = new X962Parameters(ecP);
		}
		ASN1OctetString p = (ASN1OctetString)(ASN1OctetString)(new X9ECPoint(getQ())).getDERObject();
		SubjectPublicKeyInfo info = new SubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_ecPublicKey, params.getDERObject()), p.getOctets());
		try
		{
			dOut.writeObject(info);
			dOut.close();
		}
		catch (IOException e)
		{
			throw new RuntimeException("Error encoding EC public key");
		}
		return bOut.toByteArray();
	}

	public ECParameterSpec getParams()
	{
		return ecSpec;
	}

	public ECPoint getQ()
	{
		return q;
	}

	public String toString()
	{
		StringBuffer buf = new StringBuffer();
		String nl = System.getProperty("line.separator");
		buf.append((new StringBuilder()).append("EC Public Key").append(nl).toString());
		buf.append((new StringBuilder()).append("            X: ").append(getQ().getX().toBigInteger().toString(16)).append(nl).toString());
		buf.append((new StringBuilder()).append("            Y: ").append(getQ().getY().toBigInteger().toString(16)).append(nl).toString());
		return buf.toString();
	}
}