gnu.crypto.mac
Class MacInputStream

java.lang.Object
  java.io.InputStream
      java.io.FilterInputStream
          gnu.crypto.mac.MacInputStream

public class MacInputStream

extends java.io.FilterInputStream

A filtering input stream that computes a MAC (message authentication code) over all data read from the stream.

Version:

$Revision: 1.2 $

Field Summary

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

MacInputStream(java.io.InputStream in, IMac mac)
Creates a new MacInputStream.

Method Summary

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

Methods inherited from class java.io.FilterInputStream

available, close, mark, markSupported, read, reset, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

MacInputStream

public MacInputStream(java.io.InputStream in,
                      IMac mac)

Creates a new MacInputStream. 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:

in - The underlying input 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 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.

read

public int read()
         throws java.io.IOException

Throws:

java.io.IOException

read

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

Throws:

java.io.IOException