de.rtner.security.auth.spi
Class MacBasedPRF

java.lang.Object
  de.rtner.security.auth.spi.MacBasedPRF

All Implemented Interfaces:

PRF

public class MacBasedPRF
extends java.lang.Object
implements PRF

Default PRF implementation based on standard javax.crypt.Mac mechanisms.

Field Summary

protected int	hLen
protected javax.crypto.Mac	mac
protected java.lang.String	macAlgorithm

Constructor Summary

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

MacBasedPRF(java.lang.String macAlgorithm, java.lang.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 javax.crypto.Mac mac

hLen

protected int hLen

macAlgorithm

protected java.lang.String macAlgorithm

Constructor Detail

MacBasedPRF

public MacBasedPRF(java.lang.String macAlgorithm)

Create Mac-based Pseudo Random Function.

Parameters:

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

MacBasedPRF

public MacBasedPRF(java.lang.String macAlgorithm,
                   java.lang.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.