Class PBKDF2

Implemented Interfaces:
Cloneable, IRandom

public class PBKDF2
extends BasePRNG
implements Cloneable

An implementation of the key derivation function KDF2 from PKCS #5: Password-Based Cryptography (PBE). This KDF is essentially a way to transform a password and a salt into a stream of random bytes, which may then be used to initialize a cipher or a MAC.

This version uses a MAC as its pseudo-random function, and the password is used as the key.


  1. B. Kaliski, RFC 2898: Password-Based Cryptography Specification, Version 2.0

Field Summary

Fields inherited from class

buffer, initialised, name, ndx

Constructor Summary

PBKDF2(IMac mac)
Creates a new PBKDF2 object.

Method Summary

setup(Map<K,V> attributes)

Methods inherited from class

addRandomByte, addRandomBytes, addRandomBytes, clone, fillBlock, init, isInitialised, name, nextByte, nextBytes, nextBytes, setup

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details


public PBKDF2(IMac mac)
Creates a new PBKDF2 object. The argument is the MAC that will serve as the pseudo-random function. The MAC does not need to be initialized.
mac - The pseudo-random function.

Method Details


public void fillBlock()
            throws LimitReachedException
fillBlock in interface BasePRNG


public void setup(Map<K,V> attributes)
setup in interface BasePRNG -- Copyright (C) 2003, 2006 Free Software Foundation, Inc. This file is a part of GNU Classpath. GNU Classpath 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. GNU Classpath 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 GNU Classpath; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.