net.scattersphere.data

Class MD5

java.lang.Object

net.scattersphere.data.MD5

public class MD5
extends Object

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.

Author:

Jon Howell <jonh@cs.dartmouth.edu>

Constructor Summary

Constructors

Constructor and Description
MD5() The constructor.

Method Summary

Modifier and Type	Method and Description
String	dumpBytes(byte[] bytes) This function dumps the bytes of a string to hexadecimal format.
static String	md5(String data) Returns the MD5 of a line of data.
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) Function to add data to an already MD5'd buffer.
void	update(byte[] newbuf, int length) Function to add data to an already MD5'd buffer.
void	update(byte[] newbuf, int bufstart, int buflen) Function to add data to an already MD5'd buffer.

Methods inherited from class java.lang.Object

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

Constructor Detail

MD5

public MD5()

The constructor. Initializes MD5 hash accumulator.

Method Detail

md5

public static String md5(String data)

Returns the MD5 of a line of data.

Parameters:

data - The string to calculate an MD5 of.

Returns:

String containing the MD5 hash of the string.

update

public void update(byte[] newbuf)

Function to add data to an already MD5'd buffer.

Parameters:

newbuf - Byte array to add

update

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

Function to add data to an already MD5'd buffer. This one lets you specify a length.

Parameters:

newbuf - Byte array to add

length - Length of byte(s) to add

update

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

Function to add data to an already MD5'd buffer. This lets you specify the start-of-buffer position, and length to copy.

Parameters:

newbuf - Byte array to add

bufstart - Where in the newbuf to start from

buflen - Length of bytes to copy

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)

This function dumps the bytes of a string to hexadecimal format.

Parameters:

bytes - Bytes to dump

Returns:

String String containing the formatted data.