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Class iaik.security.cipher.RC2

java.lang.Object
   |
   +----java.security.Cipher
           |
           +----iaik.security.cipher.RC2

public class RC2

extends Cipher

implements SymmetricCipher

It's based on code which showed up in sci.crypt. Here's the start of the article:

 >From cygnus.mincom.oz.au!minbne.mincom.oz.au!bunyip.cc.uq.oz.au!munnari.OZ.AU!comp.vuw.ac.nz!waikato!auckland.ac.nz!news Mon Feb 12 18:48:17 EST 1996
 Article 23601 of sci.crypt:
 Path: cygnus.mincom.oz.au!minbne.mincom.oz.au!bunyip.cc.uq.oz.au!munnari.OZ.AU!comp.vuw.ac.nz!waikato!auckland.ac.nz!news
 >From: pgut01@cs.auckland.ac.nz (Peter Gutmann)
 Newsgroups: sci.crypt
 Subject: Specification for Ron Rivests Cipher No.2
 Date: 11 Feb 1996 06:45:03 GMT
 Organization: University of Auckland
 Lines: 203
 Sender: pgut01@cs.auckland.ac.nz (Peter Gutmann)
 Message-ID: <4fk39f$f70@net.auckland.ac.nz>
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                         Ron Rivest's Cipher No.2
                         ------------------------
  Ron Rivest's Cipher No.2 (hereafter referred to as RRC.2, other people may
 refer to it by other names) is word oriented, operating on a block of 64 bits
 divided into four 16-bit words, with a key table of 64 words.  All data units
 are little-endian.  This functional description of the algorithm is based in
 the paper "The RC5 Encryption Algorithm" (RC5 is a trademark of RSADSI), using
 the same general layout, terminology, and pseudocode style.
 

RC2()

Constructor for a RC2 Cipher.

engineBlockSize()

Returns the length of an output block, in bytes.

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 RC2()

Constructor for a RC2 Cipher. This constructor is only for initializing the superclass. Applications should not call this constructor to get a RC2 Cipher; they should call one of the Cipher.getInstance factory methods instead.

See Also:

Cipher

 protected void engineInitEncrypt(Key rc2Key) 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 rc2Key) throws InvalidKeyException

Initializes this cipher for decryption, using the specified key. The format of the key must be "RAW" and the length must be 16 bytes or 128 bits.

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.

Returns:

the length in bytes of a block for this cipher

Overrides:

engineBlockSize in class Cipher

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