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Class PBKDF2

  extended bygnu.crypto.prng.BasePRNG
      extended bygnu.crypto.prng.PBKDF2
All Implemented Interfaces:
java.lang.Cloneable, IRandom

public class PBKDF2
extends BasePRNG
implements java.lang.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

$Revision: 1.2 $

Field Summary
Fields inherited from class gnu.crypto.prng.BasePRNG
buffer, initialised, name, ndx
Constructor Summary
PBKDF2(IMac mac)
          Creates a new PBKDF2 object.
Method Summary
 java.lang.Object clone()
          Returns a clone copy of this instance.
 void fillBlock()
 void setup(java.util.Map attributes)
Methods inherited from class gnu.crypto.prng.BasePRNG
init, isInitialised, name, nextByte, nextBytes
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail


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 Detail


public java.lang.Object clone()
Description copied from interface: IRandom

Returns a clone copy of this instance.

Specified by:
clone in interface IRandom
Specified by:
clone in class BasePRNG


public void setup(java.util.Map attributes)
Specified by:
setup in class BasePRNG


public void fillBlock()
               throws LimitReachedException
Specified by:
fillBlock in class BasePRNG

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