org.fhw.cabaweb.tools
Class MD5

java.lang.Object
  org.fhw.cabaweb.tools.MD5

public class MD5

extends Object

Klasse um MD5 Hashes zu erstellen. Originalklasse von Jon Howell - mit kleinen Änderungen von Thomas Vogt This class computes MD5 hashes. Manually translated by Jon Howell from some public domain C code (md5.c) included with the ssh-1.2.22 source. Tue Jan 19 15:55:50 EST 1999 $Id: MD5.java,v 1.2 2004/11/11 08:44:25 cabaweb Exp $ To compute the message digest of a chunk of bytes, create an MD5 object 'md5', call md5.update() as needed on buffers full of bytes, and then call md5.md5final(), which will fill a supplied 16-byte array with the digest. A main() method is included that hashes the data on System.in. It seems to run around 25-30 times slower (JDK1.1.6) than optimized C (gcc -O4, version 2.7.2.3). Measured on a Sun Ultra 5 (SPARC 270MHz). Comments from md5.c from ssh-1.2.22, the basis for this code: This code has been heavily hacked by Tatu Ylonen to make it compile on machines like Cray that don't have a 32 bit integer type. This code implements the MD5 message-digest algorithm. The algorithm is due to Ron Rivest. This code was written by Colin Plumb in 1993, no copyright is claimed. This code is in the public domain; do with it what you wish. Equivalent code is available from RSA Data Security, Inc. This code has been tested against that, and is equivalent, except that you don't need to include two pages of legalese with every copy. To compute the message digest of a chunk of bytes, declare an MD5Context structure, pass it to MD5Init, call MD5Update as needed on buffers full of bytes, and then call MD5Final, which will fill a supplied 16-byte array with the digest.

Version:

19.01.1999 21:30:11 - Changes 10.03.2004

Author:

Jon Howell

Constructor Summary

MD5()
Konstruktor

Method Summary

String	dumpBytes(byte[] bytes) No Comment
void	md5final(byte[] digest) Final wrapup - pad to 64-byte boundary with the bit pattern 1 0* (64-bit count of bits processed, MSB-first)
void	update(byte[] newbuf) No Comment
void	update(byte[] newbuf, int length) No Comment
void	update(byte[] newbuf, int bufstart, int buflen) No Comment

Methods inherited from class java.lang.Object

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

Constructor Detail

MD5

public MD5()

Konstruktor

Method Detail

update

public void update(byte[] newbuf)

No Comment

update

public void update(byte[] newbuf,
                   int length)

No Comment

update

public void update(byte[] newbuf,
                   int bufstart,
                   int buflen)

No Comment

md5final

public void md5final(byte[] digest)

Final wrapup - pad to 64-byte boundary with the bit pattern 1 0* (64-bit count of bits processed, MSB-first)

dumpBytes

public String dumpBytes(byte[] bytes)

No Comment