mirror of
https://github.com/yacy/yacy_search_server.git
synced 2024-09-19 00:01:41 +02:00
103 lines
3.2 KiB
Java
103 lines
3.2 KiB
Java
// SignatureOutputStream.java
|
|
// ----------------
|
|
// (C) 2009 by Florian Richter <mail@f1ori.de>
|
|
// first published 16.04.2009 on http://yacy.net
|
|
//
|
|
// This is a part of YaCy, a peer-to-peer based web search engine
|
|
//
|
|
// $LastChangedDate$
|
|
// $LastChangedRevision$
|
|
// $LastChangedBy$
|
|
//
|
|
// LICENSE
|
|
//
|
|
// 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 net.yacy.utils;
|
|
|
|
import java.io.IOException;
|
|
import java.io.FilterOutputStream;
|
|
import java.io.OutputStream;
|
|
import java.security.InvalidKeyException;
|
|
import java.security.NoSuchAlgorithmException;
|
|
import java.security.PublicKey;
|
|
import java.security.Signature;
|
|
import java.security.SignatureException;
|
|
|
|
/**
|
|
* A SignatureOuputStream is composed of a Signature and a OutputStream so that
|
|
* write()-methods first update the signature and then pass the data to the
|
|
* underlying OutputStream.
|
|
*
|
|
* @author flori
|
|
*
|
|
*/
|
|
public class SignatureOutputStream extends FilterOutputStream {
|
|
|
|
private Signature signature;
|
|
|
|
/**
|
|
* create new SignatureOutputStream and setup the Signature
|
|
* @param stream OutputStream to pass data on
|
|
* @param algorithm Algorithm to use for Signature
|
|
* @param publicKey Public key to verify Signature against
|
|
* @throws NoSuchAlgorithmException
|
|
*/
|
|
public SignatureOutputStream(OutputStream stream, String algorithm, PublicKey publicKey) throws NoSuchAlgorithmException {
|
|
super(stream);
|
|
try {
|
|
signature = Signature.getInstance(algorithm);
|
|
signature.initVerify(publicKey);
|
|
} catch (final InvalidKeyException e) {
|
|
System.out.println("Internal Error at signature:" + e.getMessage());
|
|
}
|
|
}
|
|
|
|
/**
|
|
* write byte
|
|
* @see FilterOutputStream.write(int b)
|
|
*/
|
|
@Override
|
|
public void write(int b) throws IOException {
|
|
try {
|
|
signature.update((byte)b);
|
|
} catch (final SignatureException e) {
|
|
throw new IOException("Signature update failed: "+ e.getMessage());
|
|
}
|
|
out.write(b);
|
|
}
|
|
|
|
@Override
|
|
public void write(byte[] b, int off, int len) throws IOException {
|
|
try {
|
|
signature.update(b, off, len);
|
|
} catch (final SignatureException e) {
|
|
throw new IOException("Signature update failed: "+ e.getMessage());
|
|
}
|
|
out.write(b, off, len);
|
|
}
|
|
|
|
/**
|
|
* verify signature, don't use this stream for another signature afterwards
|
|
* @param sign signature as bytes
|
|
* @return true, when signature was right
|
|
* @throws SignatureException
|
|
*/
|
|
public boolean verify(byte[] sign) throws SignatureException {
|
|
return signature.verify(sign);
|
|
}
|
|
|
|
}
|