gnu.crypto.mac
Class MacOutputStream

java.lang.Object
  java.io.OutputStream
      java.io.FilterOutputStream
          gnu.crypto.mac.MacOutputStream

public class MacOutputStream

extends java.io.FilterOutputStream

A filtering output stream that computes a MAC (message authentication code) over all data written to the stream.

Version:

$Revision: 1.2 $

Field Summary

Fields inherited from class java.io.FilterOutputStream

out

Constructor Summary

MacOutputStream(java.io.OutputStream out, IMac mac)
Creates a new MacOutputStream.

Method Summary

IMac	getMac() Returns the MAC this stream is updating.
void	on(boolean flag) Turns the digesting state on or off.
void	setMac(IMac mac) Sets the MAC this stream is updating, which must have already been initialized.
void	write(byte[] buf, int off, int len)
void	write(int b)

Methods inherited from class java.io.FilterOutputStream

close, flush, write

Methods inherited from class java.lang.Object

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

Constructor Detail

MacOutputStream

public MacOutputStream(java.io.OutputStream out,
                       IMac mac)

Creates a new MacOutputStream. The stream is initially set to digest data written, the mac argument must have already been initialized, and the mac argument is not cloned.

Parameters:

out - The underlying output stream.

mac - The mac instance to use.

Method Detail

getMac

public IMac getMac()

Returns the MAC this stream is updating.

Returns:

The MAC.

setMac

public void setMac(IMac mac)

Sets the MAC this stream is updating, which must have already been initialized. The argument is not cloned by this method.

Parameters:

mac - The non-null new MAC.

Throws:

java.lang.NullPointerException - If the argument is null.

on

public void on(boolean flag)

Turns the digesting state on or off. When off, the MAC will not be updated when data is written to the stream.

Parameters:

flag - The new digesting state.

write

public void write(int b)
           throws java.io.IOException

Throws:

java.io.IOException

write

public void write(byte[] buf,
                  int off,
                  int len)
           throws java.io.IOException

Throws:

java.io.IOException