com.perimeterx.utils.MacBasedPRF Maven / Gradle / Ivy
/*
* A free Java implementation of Password Based Key Derivation Function 2 as
* defined by RFC 2898. Copyright 2007, 2014, Matthias Gärtner
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package com.perimeterx.utils;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
/**
* Default PRF implementation based on standard javax.crypt.Mac mechanisms.
*
* @author Matthias Gärtner
*/
public class MacBasedPRF implements PRF {
protected Mac mac;
protected int hLen;
protected String macAlgorithm;
/**
* Create Mac-based Pseudo Random Function.
*
* @param macAlgorithm Mac algorithm to use, i.e. HMacSHA1 or HMacMD5.
*/
public MacBasedPRF(String macAlgorithm) {
this.macAlgorithm = macAlgorithm;
try {
mac = Mac.getInstance(macAlgorithm);
hLen = mac.getMacLength();
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
}
public MacBasedPRF(String macAlgorithm, String provider) {
this.macAlgorithm = macAlgorithm;
try {
mac = Mac.getInstance(macAlgorithm, provider);
hLen = mac.getMacLength();
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
} catch (NoSuchProviderException e) {
throw new RuntimeException(e);
}
}
public byte[] doFinal(byte[] M) {
return mac.doFinal(M);
}
public int getHLen() {
return hLen;
}
public void init(byte[] P) {
try {
mac.init(new SecretKeySpec(P, macAlgorithm));
} catch (InvalidKeyException e) {
throw new RuntimeException(e);
}
}
}