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## cryptix.provider.cipher
Class RC4

    java.lang.Object
      |
      +--xjava.security.IJCE_Traceable
            |
            +--xjava.security.Cipher
                  |
                  +--cryptix.provider.cipher.RC4

public final class RC4
extends Cipher
implements SymmetricCipher

This class implements the RC4 (TM) stream cipher.

The source code (C version) from which this port was done, is the one posted to the sci.crypt, alt.security, comp.security.misc, and alt.privacy newsgroups on Wed, 14 Sep 1994 06:35:31 GMT by "David Sterndark" <sterndark@netcom.com> (Message-ID: <sternCvKL4B.Hyy@netcom.com>)

RC4 (TM) was designed by Ron Rivest, and was previously a trade secret of RSA Data Security, Inc. The algorithm is now in the public domain. The name "RC4" is a trademark of RSA Data Security, Inc.

References:

1. Bruce Schneier, "Section 17.1 RC4," Applied Cryptography, 2nd edition, John Wiley & Sons, 1996.

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

$Revision: 1.5 $

Since:
  Cryptix 2.2.2
Author:
  Raif S. Naffah, David Hopwood

Fields inherited from class xjava.security.Cipher
`DECRYPT, ENCRYPT, UNINITIALIZED`

Constructor Summary
`RC4()` Constructs an RC4 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).
`int` | `engineBlockSize()` SPI: Returns the length of an input block, in bytes.
`void` | `engineInitDecrypt(java.security.Key key)` SPI: Initializes this cipher for decryption, using the specified key.
`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()`

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

### RC4

    public RC4()

  Constructs an RC4 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()

### 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
  Tags copied from class: Cipher
  Throws:
    java.lang.CloneNotSupportedException - if the cipher is not cloneable.

### engineBlockSize

    public 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

    public void engineInitEncrypt(java.security.Key key)
                           throws java.security.InvalidKeyException

  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 the key is invalid.

### engineInitDecrypt

    public void engineInitDecrypt(java.security.Key key)
                           throws java.security.InvalidKeyException

  SPI: Initializes this cipher for decryption, using the specified key.
  Overrides:
    engineInitDecrypt in class Cipher
  Parameters:
    `key` - the key to use for decryption.
  Throws:
    java.security.InvalidKeyException - if the key is invalid.

### 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.

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Copyright (C) 1995-2000 The Cryptix Foundation Ltd. All rights reserved.