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gnu.crypto.cipher
Class Khazad

java.lang.Object
  extended by gnu.crypto.cipher.BaseCipher
      extended by gnu.crypto.cipher.Khazad
All Implemented Interfaces:
IBlockCipher, IBlockCipherSpi, Cloneable

public final class Khazad
extends BaseCipher

Khazad is a 64-bit (legacy-level) block cipher that accepts a 128-bit key. The cipher is a uniform substitution-permutation network whose inverse only differs from the forward operation in the key schedule. The overall cipher design follows the Wide Trail strategy, favours component reuse, and permits a wide variety of implementation trade-offs.

References:

  1. The Khazad Block Cipher.
    Paulo S.L.M. Barreto and Vincent Rijmen.

Version:
$Revision: 1.10 $

Field Summary
 
Fields inherited from class gnu.crypto.cipher.BaseCipher
currentBlockSize, currentKey, defaultBlockSize, defaultKeySize, lock, name
 
Fields inherited from interface gnu.crypto.cipher.IBlockCipher
CIPHER_BLOCK_SIZE, KEY_MATERIAL
 
Constructor Summary
Khazad()
          Trivial 0-arguments constructor.
 
Method Summary
 Iterator blockSizes()
          Returns an Iterator over the supported block sizes.
 Object clone()
          Returns a clone of this instance.
 void decrypt(byte[] in, int i, byte[] out, int j, Object k, int bs)
           
 void encrypt(byte[] in, int i, byte[] out, int j, Object k, int bs)
           
 Iterator keySizes()
          Returns an Iterator over the supported key sizes.
 Object makeKey(byte[] uk, int bs)
          Expands a user-supplied key material into a session key for a designated block size.
 boolean selfTest()
          A correctness test that consists of basic symmetric encryption / decryption test(s) for all supported block and key sizes, as well as one (1) variable key Known Answer Test (KAT).
 
Methods inherited from class gnu.crypto.cipher.BaseCipher
currentBlockSize, decryptBlock, defaultBlockSize, defaultKeySize, encryptBlock, init, name, reset, testKat, testKat
 
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

Khazad

public Khazad()
Trivial 0-arguments constructor.

Method Detail

clone

public Object clone()
Description copied from interface: IBlockCipher

Returns a clone of this instance.

Specified by:
clone in interface IBlockCipher
Specified by:
clone in class BaseCipher
Returns:
a clone copy of this instance.

blockSizes

public Iterator blockSizes()
Description copied from interface: IBlockCipher

Returns an Iterator over the supported block sizes. Each element returned by this object is an Integer.

Returns:
an Iterator over the supported block sizes.

keySizes

public Iterator keySizes()
Description copied from interface: IBlockCipher

Returns an Iterator over the supported key sizes. Each element returned by this object is an Integer.

Returns:
an Iterator over the supported key sizes.

makeKey

public Object makeKey(byte[] uk,
                      int bs)
               throws InvalidKeyException

Expands a user-supplied key material into a session key for a designated block size.

Parameters:
uk - the 128-bit user-supplied key material.
bs - the desired block size in bytes.
Returns:
an Object encapsulating the session key.
Throws:
IllegalArgumentException - if the block size is not 16 (128-bit).
InvalidKeyException - if the key data is invalid.

encrypt

public void encrypt(byte[] in,
                    int i,
                    byte[] out,
                    int j,
                    Object k,
                    int bs)

decrypt

public void decrypt(byte[] in,
                    int i,
                    byte[] out,
                    int j,
                    Object k,
                    int bs)

selfTest

public boolean selfTest()
Description copied from interface: IBlockCipher

A correctness test that consists of basic symmetric encryption / decryption test(s) for all supported block and key sizes, as well as one (1) variable key Known Answer Test (KAT).

Specified by:
selfTest in interface IBlockCipher
Specified by:
selfTest in interface IBlockCipherSpi
Overrides:
selfTest in class BaseCipher
Returns:
true if the implementation passes simple correctness tests. Returns false otherwise.

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