/*
* SSHTools - Java SSH2 API
*
* Copyright (C) 2002-2003 Lee David Painter and Contributors.
*
* Contributions made by:
*
* Brett Smith
* Richard Pernavas
* Erwin Bolwidt
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package com.sshtools.j2ssh.transport.publickey.rsa;
import com.sshtools.j2ssh.io.ByteArrayReader;
import com.sshtools.j2ssh.io.ByteArrayWriter;
import com.sshtools.j2ssh.transport.publickey.InvalidSshKeyException;
import com.sshtools.j2ssh.transport.publickey.SshPrivateKey;
import com.sshtools.j2ssh.transport.publickey.SshPublicKey;
import java.io.IOException;
import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.RSAPublicKeySpec;
/**
*
*
* @author $author$
* @version $Revision: 1.19 $
*/
public class SshRsaPrivateKey extends SshPrivateKey {
RSAPrivateKey prvKey;
RSAPublicKey pubKey;
/**
* Creates a new SshRsaPrivateKey object.
*
* @param prv
* @param pub
*/
public SshRsaPrivateKey(RSAPrivateKey prv, RSAPublicKey pub) {
prvKey = prv;
pubKey = pub;
}
/**
* Creates a new SshRsaPrivateKey object.
*
* @param encoded
*
* @throws InvalidSshKeyException
*/
public SshRsaPrivateKey(byte[] encoded) throws InvalidSshKeyException {
try {
// Extract the key information
ByteArrayReader bar = new ByteArrayReader(encoded);
// Read the public key
String header = bar.readString();
if (!header.equals(getAlgorithmName())) {
throw new InvalidSshKeyException();
}
BigInteger e = bar.readBigInteger();
BigInteger n = bar.readBigInteger();
// Read the private key
BigInteger p = bar.readBigInteger();
RSAPrivateKeySpec prvSpec = new RSAPrivateKeySpec(n, p);
RSAPublicKeySpec pubSpec = new RSAPublicKeySpec(n, e);
KeyFactory kf = KeyFactory.getInstance("RSA");
prvKey = (RSAPrivateKey) kf.generatePrivate(prvSpec);
pubKey = (RSAPublicKey) kf.generatePublic(pubSpec);
} catch (Exception e) {
throw new InvalidSshKeyException();
}
}
/**
*
*
* @param obj
*
* @return
*/
public boolean equals(Object obj) {
if (obj instanceof SshRsaPrivateKey) {
return prvKey.equals(((SshRsaPrivateKey) obj).prvKey);
}
return false;
}
/**
*
*
* @return
*/
public int hashCode() {
return prvKey.hashCode();
}
/**
*
*
* @return
*/
public String getAlgorithmName() {
return "ssh-rsa";
}
/**
*
*
* @return
*/
public int getBitLength() {
return prvKey.getModulus().bitLength();
}
/**
*
*
* @return
*/
public byte[] getEncoded() {
try {
ByteArrayWriter baw = new ByteArrayWriter();
// The private key consists of the public key blob
baw.write(getPublicKey().getEncoded());
// And the private data
baw.writeBigInteger(prvKey.getPrivateExponent());
return baw.toByteArray();
} catch (IOException ioe) {
return null;
}
}
/**
*
*
* @return
*/
public SshPublicKey getPublicKey() {
return new SshRsaPublicKey(pubKey);
}
/**
*
*
* @param data
*
* @return
*/
public byte[] generateSignature(byte[] data) {
try {
Signature sig = Signature.getInstance("SHA1withRSA");
sig.initSign(prvKey);
sig.update(data);
ByteArrayWriter baw = new ByteArrayWriter();
baw.writeString(getAlgorithmName());
baw.writeBinaryString(sig.sign());
return baw.toByteArray();
} catch (Exception e) {
return null;
}
}
}