/**
* This file is part of Waarp Project.
*
* Copyright 2009, Frederic Bregier, and individual contributors by the @author tags. See the
* COPYRIGHT.txt in the distribution for a full listing of individual contributors.
*
* All Waarp Project 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 3 of
* the License, or (at your option) any later version.
*
* Waarp 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 Waarp . If not, see
* <http://www.gnu.org/licenses/>.
*/
package org.waarp.common.crypto;
import javax.crypto.Cipher;
import javax.crypto.Mac;
/**
* This class handles methods to crypt (not decrypt) messages with HmacSha1 algorithm (very efficient:
* 136000/s).<br>
* <br>
* Usage:<br>
* <ul>
* <li>Create a HmacSha1 object: HmacSha1 key = new HmacSha1();</li>
* <li>Create a key:
* <ul>
* <li>Generate: key.generateKey();<br>
* The method key.getSecretKeyInBytes() allow getting the key in Bytes.</li>
* <li>From an external source: key.setSecretKey(arrayOfBytes);</li>
* </ul>
* </li>
* <li>To crypt a String in a Base64 format: String myStringCrypt = key.cryptToString(myString);</li>
* </ul>
*
* @author frederic bregier
*
*/
public class HmacSha1 extends KeyObject {
private final static int KEY_SIZE = 128;
private final static String ALGO = "HmacSHA1";
private final static String INSTANCE = ALGO;
public final static String EXTENSION = "hs1";
@Override
public String getAlgorithm() {
return ALGO;
}
@Override
public String getInstance() {
return INSTANCE;
}
@Override
public int getKeySize() {
return KEY_SIZE;
}
@Override
public String getFileExtension() {
return EXTENSION;
}
@Override
public Cipher toCrypt() {
throw new IllegalArgumentException("Cannot be used for HmacSha1");
}
@Override
public byte[] crypt(byte[] plaintext) throws Exception {
Mac mac = Mac.getInstance(ALGO);
mac.init(secretKey);
return mac.doFinal(plaintext);
}
@Override
public Cipher toDecrypt() {
throw new IllegalArgumentException("Cannot be used for HmacSha1");
}
@Override
public byte[] decrypt(byte[] ciphertext) throws Exception {
throw new IllegalArgumentException("Cannot be used for HmacSha1");
}
}