cryptix.provider.cipher

Class IDEA

java.lang.Object

xjava.security.IJCE_Traceable

xjava.security.Cipher

cryptix.provider.cipher.IDEA

All Implemented Interfaces:

Parameterized, SymmetricCipher

public final class IDEA
extends Cipher
implements SymmetricCipher

IDEA is a block cipher with a key length of 16 bytes and a block length of 8 bytes. It is highly popular, being the original cipher in PGP, and has received a lot of cryptanalytic attention.

IDEA was written by Dr. X. Lai and Prof. J. Massey.

References:

1. See the IDEA page for more details.

2. The algorithm is subject to patent claims by Ascom Systec Ltd (applied for May 1991), and is licensable.

Copyright © 1995-1997 Systemics Ltd on behalf of the Cryptix Development Team.
All rights reserved.

$Revision: 1.4 $

Since:

Cryptix 2.2.2

Author:

Systemics Ltd, David Hopwood, Raif S. Naffah

Field Summary

Fields inherited from class xjava.security.Cipher

DECRYPT, ENCRYPT, UNINITIALIZED

Constructor Summary

Constructors

Constructor and Description
IDEA() Constructs an IDEA cipher object, in the UNINITIALIZED state.

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.Object	clone() Always throws a CloneNotSupportedException (cloning of ciphers is not supported for security reasons).
protected int	engineBlockSize() SPI: Returns the length of an input block, in bytes.
protected void	engineInitDecrypt(java.security.Key key) SPI: Initializes this cipher for decryption, using the specified key.
protected void	engineInitEncrypt(java.security.Key key) SPI: Initializes this cipher for encryption, using the specified key.
protected int	engineUpdate(byte[] in, int inOffset, int inLen, byte[] out, int outOffset) SPI: This is the main engine method for updating data.
protected void	finalize() Cleans up resources used by this instance, if necessary.
static LinkStatus	getLinkStatus() Gets an object representing the native linking status of this class.
static void	main(java.lang.String[] argv) Entry point for very basic self_test.
static void	self_test() Do some basic tests.

Methods inherited from class xjava.security.Cipher

blockSize, crypt, crypt, crypt, doFinal, doFinal, doFinal, doFinal, engineCiphertextBlockSize, engineCrypt, engineGetParameter, engineInBufferSize, engineOutBufferSize, enginePlaintextBlockSize, engineSetPaddingScheme, engineSetParameter, getAlgorithm, getAlgorithms, getAlgorithms, getCiphertextBlockSize, getInputBlockSize, getInstance, getInstance, getInstance, getMode, getOutputBlockSize, getPadding, getPaddingScheme, getParameter, getPlaintextBlockSize, getProvider, getState, inBufferSize, inBufferSizeFinal, initDecrypt, initEncrypt, isPaddingBlockCipher, outBufferSize, outBufferSizeFinal, setParameter, toString, update, update, update, update

Methods inherited from class java.lang.Object

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

Constructor Detail

IDEA

public IDEA()

Constructs an IDEA cipher object, in the UNINITIALIZED state. This calls the Cipher constructor with implBuffering false, implPadding false and the provider set to "Cryptix".

Method Detail

getLinkStatus

public static LinkStatus getLinkStatus()

Gets an object representing the native linking status of this class.

finalize

protected final void finalize()

Cleans up resources used by this instance, if necessary.

Overrides:

finalize in class java.lang.Object

clone

public final java.lang.Object clone()
                             throws java.lang.CloneNotSupportedException

Always throws a CloneNotSupportedException (cloning of ciphers is not supported for security reasons).

Overrides:

clone in class Cipher

Throws:

java.lang.CloneNotSupportedException - if the cipher is not cloneable.

engineBlockSize

protected int engineBlockSize()

SPI: Returns the length of an input block, in bytes.

Overrides:

engineBlockSize in class Cipher

Returns:

the length in bytes of an input block for this cipher.

engineInitEncrypt

protected void engineInitEncrypt(java.security.Key key)
                          throws java.security.InvalidKeyException,
                                 CryptixException

SPI: Initializes this cipher for encryption, using the specified key.

Specified by:

engineInitEncrypt in class Cipher

Parameters:

key - the key to use for encryption.

Throws:

java.security.InvalidKeyException - if one of the following occurs:

• key.getEncoded() == null;
• The length of the user key array is not KEY_LENGTH.

CryptixException

engineInitDecrypt

protected void engineInitDecrypt(java.security.Key key)
                          throws java.security.InvalidKeyException,
                                 CryptixException

SPI: Initializes this cipher for decryption, using the specified key.

Specified by:

engineInitDecrypt in class Cipher

Parameters:

key - the key to use for encryption.

Throws:

java.security.InvalidKeyException - if one of the following occurs:

• key.getEncoded() == null;
• The length of the user key array is not KEY_LENGTH.

CryptixException

engineUpdate

protected int engineUpdate(byte[] in,
               int inOffset,
               int inLen,
               byte[] out,
               int outOffset)

SPI: This is the main engine method for updating data.

in and out may be the same array, and the input and output regions may overlap.

Specified by:

engineUpdate in class Cipher

Parameters:

in - the input data.

inOffset - the offset into in specifying where the data starts.

inLen - the length of the subarray.

out - the output array.

outOffset - the offset indicating where to start writing into the out array.

Returns:

the number of bytes written.

Throws:

CryptixException - if the native library is being used, and it reports an error.

main

public static void main(java.lang.String[] argv)

Entry point for very basic self_test.

self_test

public static void self_test()
                      throws java.lang.Throwable

Do some basic tests. Three of the certification data are included only, no output, success or exception. If you want more, write a test program!

Throws:

java.lang.Throwable

See Also:

cryptix.examples.IDEA