org.jboss.seam.security.crypto
Class MacBasedPRF

java.lang.Object
  org.jboss.seam.security.crypto.MacBasedPRF

All Implemented Interfaces:

PRF

public class MacBasedPRF
extends Object
implements PRF

Copied from Matthias Gartner's PKCS#5 implementation - see http://rtner.de/software/PBKDF2.html Default PRF implementation based on standard javax.crypt.Mac mechanisms.

A free Java implementation of Password Based Key Derivation Function 2 as defined by RFC 2898. Copyright (c) 2007 Matthias Gärtner

This library 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 library 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 library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

For Details, see http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

Version:

1.0

Author:

Matthias Gärtner

Field Summary

protected int	hLen
protected Mac	mac
protected String	macAlgorithm

Constructor Summary

MacBasedPRF(String macAlgorithm)
Create Mac-based Pseudo Random Function.

MacBasedPRF(String macAlgorithm, String provider)

Method Summary

byte[]	doFinal(byte[] M) Pseudo Random Function
int	getHLen() Query block size of underlying algorithm/mechanism.
void	init(byte[] P) Initialize this instance with the user-supplied password.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

mac

protected Mac mac

hLen

protected int hLen

macAlgorithm

protected String macAlgorithm

Constructor Detail

MacBasedPRF

public MacBasedPRF(String macAlgorithm)

Create Mac-based Pseudo Random Function.

Parameters:

macAlgorithm - Mac algorithm to use, i.e. HMacSHA1 or HMacMD5.

MacBasedPRF

public MacBasedPRF(String macAlgorithm,
                   String provider)

Method Detail

doFinal

public byte[] doFinal(byte[] M)

Description copied from interface: PRF

Pseudo Random Function

Specified by:

doFinal in interface PRF

Parameters:

M - Input data/message etc. Together with any data supplied during initilization.

Returns:

Random bytes of hLen length.

getHLen

public int getHLen()

Description copied from interface: PRF

Query block size of underlying algorithm/mechanism.

Specified by:

getHLen in interface PRF

Returns:

block size

init

public void init(byte[] P)

Description copied from interface: PRF

Initialize this instance with the user-supplied password.

Specified by:

init in interface PRF

Parameters:

P - The password supplied as array of bytes. It is the caller's task to convert String passwords to bytes as appropriate.