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gnu.javax.crypto.mac

Class OMAC

Implemented Interfaces:
IMac
public class OMAC
extends Object
implements IMac
The One-Key CBC MAC, OMAC. This message authentication code is based on a block cipher in CBC mode.

References:

  1. Tetsu Iwata and Kaoru Kurosawa, OMAC: One-Key CBC MAC.

Fields inherited from interface gnu.javax.crypto.mac.IMac

MAC_KEY_MATERIAL, TRUNCATED_SIZE

Constructor Summary

OMAC(IBlockCipher cipher)

Method Summary

Object
clone()
Returns a clone copy of this instance.
byte[]
digest()
Completes the MAC by performing final operations such as padding and resetting the instance.
void
digest(byte[] out, int off)
void
init(Map<K,V> attrib)
Initialises the algorithm with designated attributes.
int
macSize()
Returns the output length in bytes of this MAC algorithm.
String
name()
Returns the canonical name of this algorithm.
void
reset()
Resets the algorithm instance for re-initialisation and use with other characteristics.
boolean
selfTest()
A basic test.
void
update(byte b)
Continues a MAC operation using the input byte.
void
update(byte[] buf, int off, int len)
Continues a MAC operation, by filling the buffer, processing data in the algorithm's MAC_SIZE-bit block(s), updating the context and count, and buffering the remaining bytes in buffer for the next operation.

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

OMAC

public OMAC(IBlockCipher cipher)

Method Details

clone

public Object clone()
Returns a clone copy of this instance.
Specified by:
clone in interface IMac
Overrides:
clone in interface Object
Returns:
a clone copy of this instance.

digest

public byte[] digest()
Completes the MAC by performing final operations such as padding and resetting the instance.
Specified by:
digest in interface IMac
Returns:
the array of bytes representing the MAC value.

digest

public void digest(byte[] out,
                   int off)

init

public void init(Map<K,V> attrib)
            throws InvalidKeyException
Initialises the algorithm with designated attributes. Permissible names and values are described in the class documentation above.
Specified by:
init in interface IMac
Parameters:
Throws:
InvalidKeyException - if the key data is invalid.
IllegalStateException - if the instance is already initialised.
See Also:
IMac.MAC_KEY_MATERIAL

macSize

public int macSize()
Returns the output length in bytes of this MAC algorithm.
Specified by:
macSize in interface IMac
Returns:
the output length in bytes of this MAC algorithm.

name

public String name()
Returns the canonical name of this algorithm.
Specified by:
name in interface IMac
Returns:
the canonical name of this algorithm.

reset

public void reset()
Resets the algorithm instance for re-initialisation and use with other characteristics. This method always succeeds.
Specified by:
reset in interface IMac

selfTest

public boolean selfTest()
A basic test. Ensures that the MAC of a pre-determined message is equal to a known pre-computed value.
Specified by:
selfTest in interface IMac
Returns:
true if the implementation passes a basic self-test. Returns false otherwise.

update

public void update(byte b)
Continues a MAC operation using the input byte.
Specified by:
update in interface IMac
Parameters:
b - the input byte to digest.

update

public void update(byte[] buf,
                   int off,
                   int len)
Continues a MAC operation, by filling the buffer, processing data in the algorithm's MAC_SIZE-bit block(s), updating the context and count, and buffering the remaining bytes in buffer for the next operation.
Specified by:
update in interface IMac
Parameters:
OMAC.java -- Copyright (C) 2004, 2006, 2010 Free Software Foundation, Inc. This file is a part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. GNU Classpath is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.

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