ARCFour (GNU cryptographic primitives and tools, version 2.0.0)

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gnu.crypto.prng
Class ARCFour

java.lang.Object
 extended bygnu.crypto.prng.BasePRNG
 extended bygnu.crypto.prng.ARCFour

All Implemented Interfaces:: java.lang.Cloneable, IRandom

public class ARCFour
extends BasePRNG

RC4 is a stream cipher developed by Ron Rivest. Until 1994 RC4 was a trade secret of RSA Data Security, Inc., when it was released anonymously to a mailing list. This version is a descendent of that code, and since there is no proof that the leaked version was in fact RC4 and because "RC4" is a trademark, it is called "ARCFOUR", short for "Allegedly RC4".

This class only implements the keystream of ARCFOUR. To use this as a stream cipher, one would say:

 out = in ^ arcfour.nextByte();

This operation works for encryption and decryption.

References:

Schneier, Bruce: Applied Cryptography: Protocols, Algorithms, and Source Code in C, Second Edition. (1996 John Wiley and Sons), pp. 397--398. ISBN 0-471-11709-9
K. Kaukonen and R. Thayer, "A Stream Cipher Encryption Algorithm 'Arcfour'", Internet Draft (expired), draft-kaukonen-cipher-arcfour-03.txt

Version:: $Revision: 1.2 $

Field Summary
`static java.lang.String`	`ARCFOUR_KEY_MATERIAL` The attributes property name for the key bytes.
`static int`	`ARCFOUR_SBOX_SIZE` The size of the internal S-box.

Fields inherited from class gnu.crypto.prng.BasePRNG

buffer, initialised, name, ndx

Constructor Summary
`ARCFour()` Default 0-arguments constructor.

Method Summary
`java.lang.Object`	`clone()` Returns a clone copy of this instance.
`void`	`fillBlock()`
`void`	`setup(java.util.Map attributes)`

Methods inherited from class gnu.crypto.prng.BasePRNG

init, isInitialised, name, nextByte, nextBytes

Methods inherited from class java.lang.Object

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

Field Detail

ARCFOUR_KEY_MATERIAL

public static final java.lang.String ARCFOUR_KEY_MATERIAL

The attributes property name for the key bytes.

See Also:: Constant Field Values

ARCFOUR_SBOX_SIZE

public static final int ARCFOUR_SBOX_SIZE

The size of the internal S-box.

See Also:: Constant Field Values

Constructor Detail

ARCFour

public ARCFour()

Default 0-arguments constructor.

Method Detail

clone

public java.lang.Object clone()

Description copied from interface: IRandom

Returns a clone copy of this instance.

Specified by:: clone in interface IRandom
Specified by:: clone in class BasePRNG

setup

public void setup(java.util.Map attributes)

Specified by:: setup in class BasePRNG

fillBlock

public void fillBlock()
 throws LimitReachedException

Specified by:: fillBlock in class BasePRNG

Throws:: LimitReachedException