org.apache.java.security
Class MD5

java.lang.Object
  |
  +--org.apache.java.security.MessageDigest
        |
        +--org.apache.java.security.MD5

public final class MD5

extends MessageDigest

This class implements the Message Digest 5 algorithm (MD5) as defined in RFC-1321.

Note: even if standard Java 1.1 APIs already provide a MD5 implementation, this class is used on those Java runtime environments (like Kaffe) where the package java.security is highly improbable to be found.

Version:

$Revision: 1.4 $ $Date: 1999/04/26 00:33:56 $

Field Summary

private byte[]	buffer
private long	counter
private static java.lang.String[]	digests
private static java.lang.String[]	messages Self Test
(package private) static byte[]	padding MD5 Functions
private int	reminder
private int[]	state
private int[]	x

Constructor Summary

MD5()
Creates the algorithm and reset its state.

Method Summary

void	append(byte[] block, int offset, int length) Append another block of specified length to the message starting at the given offset.
private static void	byte2int(byte[] in, int[] out) Converts a 64-byte array into a 16-int array.
byte[]	digest(byte[] block, int offset, int length) Appends a message block with specified length starting from the given offset and return its message digest.
private static int	F(int x, int y, int z)
private static int	FF(int a, int b, int c, int d, int x, int s, int ac)
private static int	G(int x, int y, int z)
private static int	GG(int a, int b, int c, int d, int x, int s, int ac)
private static int	H(int x, int y, int z)
private static int	HH(int a, int b, int c, int d, int x, int s, int ac)
private static int	I(int x, int y, int z)
private static int	II(int a, int b, int c, int d, int x, int s, int ac)
private static void	int2byte(int[] in, byte[] out) Converts a 4-int array into a 16-byte array.
static void	main(java.lang.String[] ignored)
void	reset() Resets the state of the class.
static byte[]	toBytes(long n) Converts a long to a 8-byte array using low order first.
private void	transform(byte[] buffer)

Methods inherited from class org.apache.java.security.MessageDigest

append, append, digest, digest

Methods inherited from class java.lang.Object

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

Field Detail

counter

private long counter

reminder

private int reminder

buffer

private byte[] buffer

state

private int[] state

x

private int[] x

padding

static byte[] padding

MD5 Functions

messages

private static java.lang.String[] messages

Self Test

digests

private static java.lang.String[] digests

Constructor Detail

MD5

public MD5()

Creates the algorithm and reset its state.

Method Detail

reset

public void reset()

Resets the state of the class. Beware: calling this method erases all data previously inserted.

Overrides:

reset in class MessageDigest

append

public void append(byte[] block,
                   int offset,
                   int length)

Append another block of specified length to the message starting at the given offset.

Overrides:

append in class MessageDigest

digest

public byte[] digest(byte[] block,
                     int offset,
                     int length)

Appends a message block with specified length starting from the given offset and return its message digest.

Overrides:

digest in class MessageDigest

byte2int

private static void byte2int(byte[] in,
                             int[] out)

Converts a 64-byte array into a 16-int array.

int2byte

private static void int2byte(int[] in,
                             byte[] out)

Converts a 4-int array into a 16-byte array.

toBytes

public static byte[] toBytes(long n)

Converts a long to a 8-byte array using low order first.

F

private static int F(int x,
                     int y,
                     int z)

G

private static int G(int x,
                     int y,
                     int z)

H

private static int H(int x,
                     int y,
                     int z)

I

private static int I(int x,
                     int y,
                     int z)

FF

private static int FF(int a,
                      int b,
                      int c,
                      int d,
                      int x,
                      int s,
                      int ac)

GG

private static int GG(int a,
                      int b,
                      int c,
                      int d,
                      int x,
                      int s,
                      int ac)

HH

private static int HH(int a,
                      int b,
                      int c,
                      int d,
                      int x,
                      int s,
                      int ac)

II

private static int II(int a,
                      int b,
                      int c,
                      int d,
                      int x,
                      int s,
                      int ac)

transform

private void transform(byte[] buffer)

main

public static final void main(java.lang.String[] ignored)