mirror of
https://github.com/yacy/yacy_search_server.git
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fd31a3616a
- fix for bas ascii in comment git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@6084 6c8d7289-2bf4-0310-a012-ef5d649a1542
101 lines
3.2 KiB
Java
101 lines
3.2 KiB
Java
// SignatureOutputStream.java
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// ----------------
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// (C) 2009 by Florian Richter <mail@f1ori.de>
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// first published 16.04.2009 on http://yacy.net
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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//
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// $LastChangedDate: 2009-03-30 17:31:25 +0200 (Mo, 30. March 2009) $
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// $LastChangedRevision: 5756 $
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// $LastChangedBy: orbiter $
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//
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// LICENSE
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.tools;
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import java.io.IOException;
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import java.io.FilterOutputStream;
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import java.io.OutputStream;
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import java.security.InvalidKeyException;
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import java.security.NoSuchAlgorithmException;
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import java.security.PublicKey;
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import java.security.Signature;
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import java.security.SignatureException;
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/**
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* A SignatureOuputStream is composed of a Signature and a OutputStream so that
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* write()-methods first update the signature and then pass the data to the
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* underlying OutputStream.
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*
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* @author flori
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*
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*/
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public class SignatureOutputStream extends FilterOutputStream {
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private Signature signature;
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/**
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* create new SignatureOutputStream and setup the Signature
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* @param stream OutputStream to pass data on
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* @param algorithm Algorithm to use for Signature
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* @param publicKey Public key to verify Signature against
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* @throws NoSuchAlgorithmException
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*/
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public SignatureOutputStream(OutputStream stream, String algorithm, PublicKey publicKey) throws NoSuchAlgorithmException {
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super(stream);
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try {
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signature = Signature.getInstance(algorithm);
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signature.initVerify(publicKey);
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} catch (InvalidKeyException e) {
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System.out.println("Internal Error at signature:" + e.getMessage());
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}
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}
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/**
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* write byte
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* @see FilterOutputStream.write(int b)
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*/
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public void write(int b) throws IOException {
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try {
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signature.update((byte)b);
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} catch (SignatureException e) {
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throw new IOException("Signature update failed: "+ e.getMessage());
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}
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out.write(b);
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}
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public void write(byte[] b, int off, int len) throws IOException {
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try {
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signature.update(b, off, len);
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} catch (SignatureException e) {
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throw new IOException("Signature update failed: "+ e.getMessage());
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}
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out.write(b, off, len);
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}
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/**
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* verify signature, don't use this stream for another signature afterwards
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* @param sign signature as bytes
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* @return true, when signature was right
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* @throws SignatureException
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*/
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public boolean verify(byte[] sign) throws SignatureException {
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return signature.verify(sign);
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}
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}
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