Class MD4

Implemented Interfaces:
Cloneable, IMessageDigest

public class MD4
extends BaseHash

An implementation of Ron Rivest's MD4 message digest algorithm.

MD4 was the precursor to the stronger MD5 algorithm, and while not considered cryptograpically secure itself, MD4 is in use in various applications. It is slightly faster than MD5.


  1. The MD4 Message-Digest Algorithm.
    R. Rivest.

Field Summary

Fields inherited from class

blockSize, buffer, count, hashSize, name

Constructor Summary

Public constructor.

Method Summary

This method may be called to create a new copy of the Object.
protected byte[]
protected byte[]
protected void
protected void
transform(byte[] in, int i)

Methods inherited from class

blockSize, clone, digest, getResult, hashSize, name, padBuffer, reset, resetContext, selfTest, transform, update, update, update

Methods inherited from class java.lang.Object

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

Constructor Details


public MD4()
Public constructor. Initializes the chaining variables, sets the byte count to 0, and creates a new block of 512 bits.

Method Details


public Object clone()
This method may be called to create a new copy of the Object. The typical behavior is as follows:
  • o == o.clone() is false
  • o.getClass() == o.clone().getClass() is true
  • o.equals(o) is true

However, these are not strict requirements, and may be violated if necessary. Of the three requirements, the last is the most commonly violated, particularly if the subclass does not override Object.equals(Object).

If the Object you call clone() on does not implement Cloneable (which is a placeholder interface), then a CloneNotSupportedException is thrown. Notice that Object does not implement Cloneable; this method exists as a convenience for subclasses that do.

Object's implementation of clone allocates space for the new Object using the correct class, without calling any constructors, and then fills in all of the new field values with the old field values. Thus, it is a shallow copy. However, subclasses are permitted to make a deep copy.

All array types implement Cloneable, and override this method as follows (it should never fail):

 public Object clone()
   catch (CloneNotSupportedException e)
       throw new InternalError(e.getMessage());
Specified by:
clone in interface IMessageDigest
clone in interface BaseHash
a copy of the Object
See Also:


protected byte[] getResult()
getResult in interface BaseHash


protected byte[] padBuffer()
padBuffer in interface BaseHash


protected void resetContext()
resetContext in interface BaseHash


public boolean selfTest()
Specified by:
selfTest in interface IMessageDigest
selfTest in interface BaseHash


protected void transform(byte[] in,
                         int i)
transform in interface BaseHash -- 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.