//******************************************************************
//******************************************************************
//********** 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 java.io.*;
import java.math.*;
import java.security.*;
import ants.p2p.utils.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import ants.p2p.utils.encoding.Base16;
import org.bouncycastle.crypto.params.RSAKeyParameters;
import org.bouncycastle.crypto.engines.RSAEngine;
import org.bouncycastle.crypto.AsymmetricBlockCipher;
import org.bouncycastle.crypto.encodings.PKCS1Encoding;
public class PublicHeader implements Serializable{
BigInteger exp;
BigInteger mod;
String sessionKey;
String encryptedSessionKey;
public PublicHeader(BigInteger exp, BigInteger mod){
this.exp = exp;
this.mod = mod;
}
protected PublicHeader(){}
public void encryptSessionKey() throws Exception{
this.encryptedSessionKey = this.generate();
}
public void invalidateSessionKey(){
this.sessionKey = null;
}
public BigInteger getExp() {
return this.exp;
}
public BigInteger getMod() {
return this.mod;
}
private String generate() throws Exception{
RSAKeyParameters pubParameters = new RSAKeyParameters(false, mod, exp);
AsymmetricBlockCipher eng = new PKCS1Encoding(new RSAEngine());
eng.init(true, pubParameters);
byte[] data = Base16.fromHexString(this.sessionKey);
data = eng.processBlock(data, 0, data.length);
return Base16.toHexString(data);
}
public void generateSessionKey() throws Exception{
byte[] sessionBytes = new byte[SimmetricProvider.cipherKeySize];
SecureRandom sr = new SecureRandom();
sr.nextBytes(sessionBytes);
for(int x = 0; x < sessionBytes.length; x++){
if(sessionBytes[x] < 0)
sessionBytes[x] = (byte)Math.abs(sessionBytes[x]);
}
this.sessionKey = Base16.toHexString(sessionBytes);
this.encryptSessionKey();
}
public String getBase16SessionKey() {
return this.sessionKey;
}
public String getEncryptedSessionKey() {
return this.encryptedSessionKey;
}
public Cipher getEncCipher() throws Exception{
SecretKeySpec skeySpec = new SecretKeySpec(Base16.fromHexString(sessionKey),
SimmetricProvider.cipher);
Cipher cipher = Cipher.getInstance(SimmetricProvider.cipher);
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
return cipher;
}
}