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java.lang.Object | +--xjava.security.IJCE_Traceable | +--xjava.security.Cipher | +--cryptix.provider.cipher.RC2
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 $
Field Summary | |
static int |
BLOCK_SIZE
The block size, in bytes, of this cipher. |
Fields inherited from class xjava.security.Cipher |
DECRYPT, ENCRYPT, UNINITIALIZED |
Fields inherited from class xjava.security.IJCE_Traceable |
tracing |
Constructor Summary | |
RC2()
Constructs an RC2 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()
Gets an object representing the native linking status of this class. |
Methods inherited from class xjava.security.IJCE_Traceable |
|
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
public static final int BLOCK_SIZE
Constructor Detail |
public RC2()
java.security.Cipher#UNINITIALIZED
Method Detail |
public static LinkStatus getLinkStatus()
protected final void finalize()
finalize
in class java.lang.Object
public final java.lang.Object clone() throws java.lang.CloneNotSupportedException
clone
in class Cipher
xjava.security.Cipher
java.lang.CloneNotSupportedException
- if the cipher is not cloneable.public int engineBlockSize()
engineBlockSize
in class Cipher
public void engineInitEncrypt(java.security.Key key) throws java.security.KeyException
engineInitEncrypt
in class Cipher
key
- the key to use for encryption.java.security.KeyException
- if the key is invalid.public void engineInitDecrypt(java.security.Key key) throws java.security.KeyException
engineInitDecrypt
in class Cipher
key
- the key to use for decryption.java.security.KeyException
- if the key is invalid.protected int engineUpdate(byte[] in, int inOffset, int inLen, byte[] out, int outOffset)
in and out may be the same array, and the input and output regions may overlap.
engineUpdate
in class 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.CryptixException
- if the native library is being used, and it
reports an error.
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