/*
* Created on Jul 12, 2008
* Created by Paul Gardner
*
* Copyright 2008 Vuze, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License only.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/
package com.aelitis.azureus.core.security;
import java.math.BigInteger;
import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.spec.KeySpec;
import org.bouncycastle.jce.ECNamedCurveTable;
import org.bouncycastle.jce.interfaces.ECPrivateKey;
import org.bouncycastle.jce.interfaces.ECPublicKey;
import org.bouncycastle.jce.spec.ECNamedCurveParameterSpec;
import org.bouncycastle.jce.spec.ECParameterSpec;
import org.bouncycastle.jce.spec.ECPrivateKeySpec;
import org.bouncycastle.jce.spec.ECPublicKeySpec;
import org.bouncycastle.math.ec.ECPoint;
public class
CryptoECCUtils
{
private static final ECNamedCurveParameterSpec ECCparam = ECNamedCurveTable.getParameterSpec("prime192v2");
public static KeyPair
createKeys()
throws CryptoManagerException
{
try
{
KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ECDSA", "BC");
keyGen.initialize(ECCparam);
return keyGen.genKeyPair();
}catch(Throwable e){
throw( new CryptoManagerException( "Failed to create keys", e ));
}
}
public static Signature
getSignature(
Key key )
throws CryptoManagerException
{
try
{
Signature ECCsig = Signature.getInstance("SHA1withECDSA", "BC");
if( key instanceof ECPrivateKey ){
ECCsig.initSign((ECPrivateKey)key);
}else if( key instanceof ECPublicKey ){
ECCsig.initVerify((ECPublicKey)key);
}else{
throw new CryptoManagerException("Invalid Key Type, ECC keys required");
}
return ECCsig;
}catch( CryptoManagerException e ){
throw( e );
}catch( Throwable e ){
throw( new CryptoManagerException( "Failed to create Signature", e ));
}
}
public static byte[]
keyToRawdata(
PrivateKey privkey )
throws CryptoManagerException
{
if(!(privkey instanceof ECPrivateKey)){
throw( new CryptoManagerException( "Invalid private key" ));
}
return ((ECPrivateKey)privkey).getD().toByteArray();
}
public static PrivateKey
rawdataToPrivkey(
byte[] input )
throws CryptoManagerException
{
BigInteger D = new BigInteger(input);
KeySpec keyspec = new ECPrivateKeySpec(D,(ECParameterSpec)ECCparam);
PrivateKey privkey = null;
try{
privkey = KeyFactory.getInstance("ECDSA","BC").generatePrivate(keyspec);
return privkey;
}catch( Throwable e ){
throw( new CryptoManagerException( "Failed to decode private key" ));
}
}
public static byte[]
keyToRawdata(
PublicKey pubkey )
throws CryptoManagerException
{
if(!(pubkey instanceof ECPublicKey)){
throw( new CryptoManagerException( "Invalid public key" ));
}
return ((ECPublicKey)pubkey).getQ().getEncoded();
}
public static PublicKey
rawdataToPubkey(
byte[] input )
throws CryptoManagerException
{
ECPoint W = ECCparam.getCurve().decodePoint(input);
KeySpec keyspec = new ECPublicKeySpec(W,(ECParameterSpec)ECCparam);
try{
return KeyFactory.getInstance("ECDSA", "BC").generatePublic(keyspec);
}catch (Throwable e){
throw( new CryptoManagerException( "Failed to decode public key", e ));
}
}
}