/*
* Copyright (c) 2010-2011 Michael Laudati, N1 Concepts LLC.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The names of the authors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL N1
* CONCEPTS, INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.vngx.jsch.algorithm;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.SecureRandom;
import java.security.interfaces.DSAKey;
import java.security.interfaces.DSAParams;
import java.security.interfaces.DSAPrivateKey;
import java.security.interfaces.DSAPublicKey;
/**
* Implementation of <code>KeyPairGenDSA</code> for generating key pairs using
* DSA encryption.
*
* @author Michael Laudati
*/
public final class KeyPairGenDSAImpl implements KeyPairGenDSA {
/** Private key value. */
private byte[] _x;
/** Public key value. */
private byte[] _y;
/** Prime modulus 'p'. */
private byte[] _p;
/** Prime number 'q'. */
private byte[] _q;
/** Number whose multiplicative order modulo p is q. */
private byte[] _g;
@Override
public void init(int keySize) throws Exception {
KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DSA");
keyGen.initialize(keySize, new SecureRandom());
KeyPair pair = keyGen.generateKeyPair();
_x = ((DSAPrivateKey) pair.getPrivate()).getX().toByteArray();
_y = ((DSAPublicKey) pair.getPublic()).getY().toByteArray();
DSAParams params = ((DSAKey) pair.getPrivate()).getParams();
_p = params.getP().toByteArray();
_q = params.getQ().toByteArray();
_g = params.getG().toByteArray();
}
@Override
public byte[] getX() {
return _x;
}
@Override
public byte[] getY() {
return _y;
}
@Override
public byte[] getP() {
return _p;
}
@Override
public byte[] getQ() {
return _q;
}
@Override
public byte[] getG() {
return _g;
}
}