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

Fields inherited from class xjava.security.Cipher
DECRYPT, ENCRYPT, UNINITIALIZED
 
Fields inherited from class xjava.security.IJCE_Traceable
tracing
 
Constructor Summary
IDEA()
          Constructs an IDEA cipher object, in the UNINITIALIZED state.
 
Method Summary
 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 xjava.security.IJCE_Traceable
, disableTracing, enableTracing, traceMethod, traceResult, traceResult, traceVoidMethod
 
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
Following copied from class: xjava.security.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.
Overrides:
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.

engineInitDecrypt

protected void engineInitDecrypt(java.security.Key key)
                          throws java.security.InvalidKeyException,
                                 CryptixException
SPI: Initializes this cipher for decryption, using the specified key.
Overrides:
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.

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.

Overrides:
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!
See Also:
cryptix.examples.IDEA