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gnu.java.security.prng

Class MDGenerator

Implemented Interfaces:
Cloneable, IRandom
public class MDGenerator
extends BasePRNG
implements Cloneable
A simple pseudo-random number generator that relies on a hash algorithm, that (a) starts its operation by hashing a seed, and then (b) continuously re-hashing its output. If no hash algorithm name is specified in the Map of attributes used to initialise the instance then the SHA-160 algorithm is used as the underlying hash function. Also, if no seed is given, an empty octet sequence is used.

Field Summary

static String
MD_NAME
Property name of underlying hash algorithm for this generator.
static String
SEEED
Property name of seed material.

Fields inherited from class gnu.java.security.prng.BasePRNG

buffer, initialised, name, ndx

Constructor Summary

MDGenerator()
Trivial 0-arguments constructor.

Method Summary

void
addRandomByte(byte b)
void
addRandomBytes(byte[] buf, int off, int len)
Object
clone()
void
fillBlock()
void
setup(Map<K,V> attributes)

Methods inherited from class gnu.java.security.prng.BasePRNG

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

Field Details

MD_NAME

public static final String MD_NAME
Property name of underlying hash algorithm for this generator.
Field Value:
"gnu.crypto.prng.md.hash.name"

SEEED

public static final String SEEED
Property name of seed material.
Field Value:
"gnu.crypto.prng.md.seed"

Constructor Details

MDGenerator

public MDGenerator()
Trivial 0-arguments constructor.

Method Details

addRandomByte

public void addRandomByte(byte b)
Specified by:
addRandomByte in interface IRandom
Overrides:
addRandomByte in interface BasePRNG

addRandomBytes

public void addRandomBytes(byte[] buf,
                           int off,
                           int len)
Specified by:
addRandomBytes in interface IRandom
Overrides:
addRandomBytes in interface BasePRNG

clone

public Object clone()
            throws CloneNotSupportedException
Specified by:
clone in interface IRandom
Overrides:
clone in interface BasePRNG

fillBlock

public void fillBlock()
            throws LimitReachedException
Overrides:
fillBlock in interface BasePRNG

setup

public void setup(Map<K,V> attributes)
Overrides:
setup in interface BasePRNG
MDGenerator.java -- Copyright (C) 2001, 2002, 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.

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