A subclass of Cipher to implement the RC2 (TM) block cipher algorithm in
Java.
The source code (C version) from which this port was done, and (most of)
the programming notes, are by P. Gutmann (pgut01@cs.auckland.ac.nz) -- as
obtained from Usenet.
Eric Young (eay@mincom.oz.au) implementation, also based on Gutmann's
work, and included in Eric's colossal SSL library ver 0.6.6 14 Jan 1997,
was also used for the initial key data and the computation of the session
key schedule. Code to tailor the session key for a specified length in
bits is included in this Java implementation but is crippled (commented
out). The current code behaves as if the session key is fixed at 1024-bit.
The RC2 algorithm is word (16-bit entity) oriented, operating on a block of
64 bits (or 8 Java bytes) divided into four words, with a key table of 64
words.
RC2 (TM) was designed by Ron Rivest, and was previously a trade secret of
RSA Data Security, Inc. The algorithm has since been published as an RFC
[reference?]. The name "RC2" is a trademark of RSA Data Security, Inc.
Copyright © 1997
Systemics Ltd on behalf of the
Cryptix Development Team.
All rights reserved.
$Revision: 1.4 $
clone
public final Object clone()
throws CloneNotSupportedException
Always throws a CloneNotSupportedException (cloning of ciphers is not
supported for security reasons).
- clone in interface Cipher
engineBlockSize
public int engineBlockSize()
SPI: Returns the length of an input block, in bytes.
- engineBlockSize in interface Cipher
- the length in bytes of an input block for this cipher.
engineInitDecrypt
public void engineInitDecrypt(Key key)
throws KeyException
SPI: Initializes this cipher for decryption, using the
specified key.
- engineInitDecrypt in interface Cipher
key
- the key to use for decryption.
engineInitEncrypt
public void engineInitEncrypt(Key key)
throws KeyException
SPI: Initializes this cipher for encryption, using the
specified key.
- engineInitEncrypt in interface Cipher
key
- the key to use for encryption.
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.
- engineUpdate in interface Cipher
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.
- the number of bytes written.
finalize
protected final void finalize()
Cleans up resources used by this instance, if necessary.
getLinkStatus
public static LinkStatus getLinkStatus()
Gets an object representing the native linking status of this class.