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Class iaik.security.cipher.RC4

java.lang.Object
   |
   +----java.security.Cipher
           |
           +----iaik.security.cipher.RC4

public class RC4

extends Cipher

implements SymmetricCipher

This may or may not be the real RC4 cipher. It's based on code which showed up anonymously posted in sci.crypt. Here's the start of the article:

 Path: dog.ee.lbl.gov!overload.lbl.gov!lll-winken.llnl.gov!seismo!rsg1.er.usgs.gov!jobone!newsxfer.itd.umich.edu!europa.eng.gtefsd.com!howland.reston.ans.net!EU.net!sun4nl!hacktic!usenet
 From: nobody@vox.xs4all.nl (An0nYm0Us UsEr)
 Newsgroups: sci.crypt
 Subject: RC4 ?
 Date: 13 Sep 1994 21:30:36 GMT
 Organization: Global Anonymous Remail Services Ltd.
 Lines: 83
 Message-ID: <3555ls$fsv@news.xs4all.nl>
 NNTP-Posting-Host: xs1.xs4all.nl
 X-Comment: This message did not originate from the above address.
 X-Comment: It was automatically remailed by an anonymous mailservice.
 X-Comment: Info: usura@xs4all.nl, Subject: remailer-help
 X-Comment: Please report inappropriate use to <admin@vox.xs4all.nl>
 SUBJECT:  RC4 Source Code
 I've tested this.  It is compatible with the RC4 object module
 that comes in the various RSA toolkits.
 

RC4()

Constructor for a RC4 Cipher.

engineBlockSize()

Returns the length of an output block, in bytes (=1, because it's a stream cipher).

engineInitDecrypt(Key)

Initializes this cipher for decryption, using the specified key.

engineInitEncrypt(Key)

Initializes this cipher for encryption, using the specified key.

engineUpdate(byte[], int, int, byte[], int)

Add to the bytes to be processed.

 public RC4()

Constructor for a RC4 Cipher. This constructor is only for initializing the superclass. Applications should not call this constructor to get a RC4 Cipher; they should call one of the Cipher.getInstance factory methods instead.

See Also:

Cipher

 protected void engineInitEncrypt(Key key) throws InvalidKeyException

Initializes this cipher for encryption, using the specified key. The format of the key must be "RAW".

Parameters:

key - the key to use for encryption

Throws: InvalidKeyException

if the key is invalid

Overrides:

engineInitEncrypt in class Cipher

 protected void engineInitDecrypt(Key key) throws InvalidKeyException

Initializes this cipher for decryption, using the specified key. The format of the key must be "RAW".

Parameters:

key - the key to use for encryption

Throws: InvalidKeyException

if the key is invalid

Overrides:

engineInitDecrypt in class Cipher

 public int engineUpdate(byte in[],
                         int inOff,
                         int inLen,
                         byte out[],
                         int outOff)

Add to the bytes to be processed. The result is written to the provided out buffer. The implementation is free to buffer any data, if the number of bytes passed is insufficient to process a whole block.

Parameters:

in - the input data

inOff - the offset indicating where the subarray starts in the in array

inLen - the length of the subarray

out - the output buffer.

outOff - the offset indicating where to start writing the result into the output buffer

Returns:

the number of bytes written to out.

Throws: IllegalBlockSizeException

if the length of the input data is not 64 bit

Overrides:

engineUpdate in class Cipher

 protected int engineBlockSize()

Returns the length of an output block, in bytes (=1, because it's a stream cipher).

Returns:

the length in bytes of a block for this cipher

Overrides:

engineBlockSize in class Cipher

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