com.knowgate.misc

Class MD5

java.lang.Object

com.knowgate.misc.MD5

public class MD5
extends java.lang.Object

Implementation of RSA's MD5 hash generator

Version:

$Revision: 1.1.1.1 $

Constructor Summary

Constructors

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

Method Summary

Methods

Modifier and Type	Method and Description
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.
byte[]	Final() Returns array of bytes (16 bytes) representing hash as of the current state of this object.
void	Init() Initialize MD5 internal state (object can be reused just by calling Init() after every Final()
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(int i) Update buffer with a single integer (only & 0xff part is used, as a byte)
void	Update(com.knowgate.misc.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

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

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

Init

public void Init()

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

Update

public void Update(com.knowgate.misc.MD5State stat,
          byte[] buffer,
          int offset,
          int length)
            throws java.lang.NullPointerException

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

Parameters:

state - 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)

Throws:

java.lang.NullPointerException

Update

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

Plain update, updates this object

Update

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

Update

public void Update(byte[] buffer)
            throws java.lang.NullPointerException

Updates hash with given array of bytes

Parameters:

buffer - Array of bytes to use for updating the hash

Throws:

java.lang.NullPointerException

Update

public void Update(byte b)

Updates hash with a single byte

Parameters:

b - Single byte to update the hash

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())

Update

public void Update(int i)

Update buffer with a single integer (only & 0xff part is used, as a byte)

Parameters:

i - Integer value, which is then converted to byte as i & 0xff

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

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

asHex

public java.lang.String asHex()

Returns 32-character hex representation of this objects hash

Returns:

String of this object's hash