//******************************************************************
//******************************************************************
//********** ANts Peer To Peer Sources *************
//
// ANts P2P realizes a third generation P2P net. It protects your
// privacy while you are connected and makes you not trackable, hiding
// your identity (ip) and crypting everything you are sending/receiving
// from others.
// Copyright (C) 2004 Roberto Rossi
// 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; either version 2
// of the License, or (at your option) any later version.
// 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 ants.p2p.query.security;
import ants.p2p.utils.encoding.Base16;
import org.bouncycastle.crypto.params.RSAKeyParameters;
import org.bouncycastle.crypto.params.RSAKeyGenerationParameters;
import org.bouncycastle.crypto.generators.RSAKeyPairGenerator;
import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.engines.RSAEngine;
import org.bouncycastle.crypto.AsymmetricBlockCipher;
import org.bouncycastle.crypto.encodings.PKCS1Encoding;
import java.security.SecureRandom;
import java.math.BigInteger;
import java.io.*;
public class MessageHeader extends PublicHeader implements Serializable{
SecureRandom sr = new SecureRandom();
AsymmetricCipherKeyPair acKp;
AsymmetricBlockCipher eng = new PKCS1Encoding(new RSAEngine());
static final BigInteger pubExp = new BigInteger("11", 16);
public PublicHeader generatePublicHeader(){
return new PublicHeader(this.exp,this.mod);
}
public MessageHeader(int size, int certainty) throws Exception{
RSAKeyGenerationParameters param = new RSAKeyGenerationParameters(pubExp, sr, size, certainty);
RSAKeyPairGenerator kpGen = new RSAKeyPairGenerator();
kpGen.init(param);
acKp = kpGen.generateKeyPair();
RSAKeyParameters rsaParam = (RSAKeyParameters)acKp.getPublic();
this.exp = rsaParam.getExponent();
this.mod = rsaParam.getModulus();
eng.init(false, acKp.getPrivate());
}
public BigInteger getExp(){
return this.exp;
}
public BigInteger getMod(){
return this.mod;
}
public String decryptSessionKey(String encryptedSessionKey) throws Exception{
return Base16.toHexString(this.generate(Base16.fromHexString(encryptedSessionKey)));
}
private byte[] generate(byte[] encryptedSessionKey) throws Exception{
return eng.processBlock(encryptedSessionKey, 0, encryptedSessionKey.length);
}
}