/*
* 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.math.BigInteger;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.RSAPublicKeySpec;
import org.vngx.jsch.Buffer;
/**
* Implementation of <code>SignatureRSA</code>.
*
* @author Michael Laudati
*/
public final class SignatureRSAImpl implements SignatureRSA {
/** Java JCE signature instance. */
private final Signature _signature;
/** Java JCE key factory. */
private final KeyFactory _keyFactory;
public SignatureRSAImpl() throws NoSuchAlgorithmException {
_signature = Signature.getInstance("SHA1withRSA");
_keyFactory = KeyFactory.getInstance("RSA");
}
@Override
public void setPubKey(byte[] e, byte[] n) throws Exception {
RSAPublicKeySpec rsaPubKeySpec = new RSAPublicKeySpec(new BigInteger(n), new BigInteger(e));
PublicKey pubKey = _keyFactory.generatePublic(rsaPubKeySpec);
_signature.initVerify(pubKey);
}
@Override
public void setPrvKey(byte[] d, byte[] n) throws Exception {
RSAPrivateKeySpec rsaPrivKeySpec = new RSAPrivateKeySpec(new BigInteger(n), new BigInteger(d));
PrivateKey prvKey = _keyFactory.generatePrivate(rsaPrivKeySpec);
_signature.initSign(prvKey);
}
@Override
public byte[] sign() throws Exception {
return _signature.sign();
}
@Override
public void update(byte[] data) throws Exception {
_signature.update(data);
}
@Override
public boolean verify(byte[] signature) throws Exception {
if( (signature[0] | signature[1] | signature[2]) == 0 ) {
Buffer sigBuffer = new Buffer(signature);
sigBuffer.getString(); // Skip first string
signature = sigBuffer.getString(); // second is signature
}
return _signature.verify(signature);
}
}