org.apache.java.security
Class MessageDigest

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

Direct Known Subclasses:

MD5

public abstract class MessageDigest

extends java.lang.Object

This interface abstracts a message digest algorithm.

Note: even if standard Java 1.1 APIs already provide a message digest 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 00:33:57 $

Constructor Summary

MessageDigest()
Creates the algorithm and reset its state.

Method Summary

void	append(byte[] block) Append another block to the message.
void	append(byte[] block, int length) Append another block of specified length to the message.
abstract void	append(byte[] block, int offset, int length) Append another block of specified length to the message starting at the given offset.
byte[]	digest(byte[] block) Appends a message block and return its message digest.
byte[]	digest(byte[] block, int length) Appends a message block with specified length and return its message digest.
abstract byte[]	digest(byte[] message, int offset, int length) Appends a message block with specified length starting from the given offset and return its message digest.
abstract void	reset() Resets the state of the class.

Methods inherited from class java.lang.Object

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

Constructor Detail

MessageDigest

public MessageDigest()

Creates the algorithm and reset its state.

Method Detail

reset

public abstract void reset()

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

append

public void append(byte[] block)

Append another block to the message.

append

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

Append another block of specified length to the message.

append

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

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

digest

public byte[] digest(byte[] block)

Appends a message block and return its message digest.

digest

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

Appends a message block with specified length and return its message digest.

digest

public abstract byte[] digest(byte[] message,
                              int offset,
                              int length)

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