md5
Class MD5

java.lang.Object
  md5.MD5

public class MD5
extends java.lang.Object

Implementation of RSA's MD5 hash generator

Version:

$Revision: 1.1 $

Author:

Santeri Paavolainen

Field Summary

(package private) MD5State	finals If Final() has been called, finals is set to the current finals state.
(package private) static byte[]	padding Padding for Final()
(package private) MD5State	state MD5 state

Constructor Summary

MD5()
Class constructor

MD5(java.lang.Object ob)
Initialize class, and update hash with ob.toString()

Method Summary

java.lang.String	asHex() Returns 32-character hex representation of this objects hash
static java.lang.String	asHex(byte[] hash) Turns array of bytes into string representing each byte as unsigned hex number.
java.lang.String	debugDump()
private int[]	Decode(byte[] buffer, int len, int shift)
private byte[]	Encode(int[] input, int len)
private int	FF(int a, int b, int c, int d, int x, int s, int ac)
byte[]	Final() Returns array of bytes (16 bytes) representing hash as of the current state of this object.
private int	GG(int a, int b, int c, int d, int x, int s, int ac)
private int	HH(int a, int b, int c, int d, int x, int s, int ac)
private int	II(int a, int b, int c, int d, int x, int s, int ac)
void	Init() Initialize MD5 internal state (object can be reused just by calling Init() after every Final()
static java.lang.String	md5crypt(java.lang.String input) One-stop md5 string encrypting.
private int	rotate_left(int x, int n)
private void	Transform(MD5State state, byte[] buffer, int shift)
private int	uadd(int a, int b)
private int	uadd(int a, int b, int c)
private int	uadd(int a, int b, int c, int d)
void	Update(byte b) Updates hash with a single byte
void	Update(byte[] buffer) Updates hash with given array of bytes
void	Update(byte[] buffer, int length)
void	Update(byte[] buffer, int offset, int length) Plain update, updates this object
void	Update(MD5State stat, byte[] buffer, int offset, int length) Updates hash with the bytebuffer given (using at maximum length bytes from that buffer)
void	Update(java.lang.String s) Update buffer with given string.

Methods inherited from class java.lang.Object

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

Field Detail

finals

MD5State finals

If Final() has been called, finals is set to the current finals state. Any Update() causes this to be set to null.

padding

static byte[] padding

Padding for Final()

state

MD5State state

MD5 state

Constructor Detail

MD5

public MD5()

Class constructor

MD5

public MD5(java.lang.Object ob)

Initialize class, and update hash with ob.toString()

Parameters:

ob - Object, ob.toString() is used to update hash after initialization

Method Detail

asHex

public java.lang.String asHex()

Returns 32-character hex representation of this objects hash

Returns:

String of this object's hash

asHex

public static java.lang.String asHex(byte[] hash)

Turns array of bytes into string representing each byte as unsigned hex number.

Parameters:

hash - Array of bytes to convert to hex-string

Returns:

Generated hex string

debugDump

public java.lang.String debugDump()

Decode

private int[] Decode(byte[] buffer,
                     int len,
                     int shift)

Encode

private byte[] Encode(int[] input,
                      int len)

FF

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

Final

public byte[] Final()

Returns array of bytes (16 bytes) representing hash as of the current state of this object. Note: getting a hash does not invalidate the hash object, it only creates a copy of the real state which is finalized.

Returns:

Array of 16 bytes, the hash of all updated bytes

GG

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

HH

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

II

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

Init

public void Init()

Initialize MD5 internal state (object can be reused just by calling Init() after every Final()

md5crypt

public static java.lang.String md5crypt(java.lang.String input)

One-stop md5 string encrypting.

rotate_left

private int rotate_left(int x,
                        int n)

Transform

private void Transform(MD5State state,
                       byte[] buffer,
                       int shift)

uadd

private int uadd(int a,
                 int b)

uadd

private int uadd(int a,
                 int b,
                 int c)

uadd

private int uadd(int a,
                 int b,
                 int c,
                 int d)

Update

public void Update(byte b)

Updates hash with a single byte

Parameters:

b - Single byte to update the hash

Update

public void Update(byte[] buffer)

Updates hash with given array of bytes

Parameters:

buffer - Array of bytes to use for updating the hash

Update

public void Update(byte[] buffer,
                   int length)

Update

public void Update(byte[] buffer,
                   int offset,
                   int length)

Plain update, updates this object

Update

public void Update(MD5State stat,
                   byte[] buffer,
                   int offset,
                   int length)

Updates hash with the bytebuffer given (using at maximum length bytes from that buffer)

Parameters:

stat - Which state is updated

buffer - Array of bytes to be hashed

offset - Offset to buffer array

length - Use at maximum `length' bytes (absolute maximum is buffer.length)

Update

public void Update(java.lang.String s)

Update buffer with given string.

Parameters:

s - String to be update to hash (is used as s.getBytes())