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Class cryptix.provider.cipher.RC2
java.lang.Object
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+----java.security.IJCE_Traceable
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+----java.security.Cipher
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+----cryptix.provider.cipher.RC2
- public final class RC2
- extends Cipher
- implements SymmetricCipher
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: 1.2 $
- Author:
- Raif S. Naffah
-
BLOCK_SIZE
- The block size, in bytes, of this cipher.
-
RC2()
- Constructs an RC2 cipher object, in the UNINITIALIZED state.
-
clone()
- Always throws a CloneNotSupportedException (cloning of ciphers is not
supported for security reasons).
-
engineBlockSize()
- SPI: Returns the length of an input block, in bytes.
-
engineInitDecrypt(Key)
- SPI: Initializes this cipher for decryption, using the
specified key.
-
engineInitEncrypt(Key)
- SPI: Initializes this cipher for encryption, using the
specified key.
-
engineUpdate(byte[], int, int, byte[], int)
- SPI: This is the main engine method for updating data.
-
finalize()
- Cleans up resources used by this instance, if necessary.
-
getLinkStatus()
- Gets an object representing the native linking status of this class.
BLOCK_SIZE
public static final int BLOCK_SIZE
- The block size, in bytes, of this cipher.
RC2
public RC2()
- Constructs an RC2 cipher object, in the UNINITIALIZED state.
This calls the Cipher constructor with implBuffering false,
implPadding false and the provider set to "Cryptix".
- See Also:
- UNINITIALIZED
getLinkStatus
public static LinkStatus getLinkStatus()
- Gets an object representing the native linking status of this class.
finalize
protected final void finalize()
- Cleans up resources used by this instance, if necessary.
- Overrides:
- finalize in class Object
clone
public final Object clone() throws CloneNotSupportedException
- Always throws a CloneNotSupportedException (cloning of ciphers is not
supported for security reasons).
- Overrides:
- clone in class Cipher
engineBlockSize
public int engineBlockSize()
- SPI: Returns the length of an input block, in bytes.
- Returns:
- the length in bytes of an input block for this cipher.
- Overrides:
- engineBlockSize in class Cipher
engineInitEncrypt
public void engineInitEncrypt(Key key) throws KeyException
- SPI: Initializes this cipher for encryption, using the
specified key.
- Parameters:
- key - the key to use for encryption.
- Throws: KeyException
- if the key is invalid.
- Overrides:
- engineInitEncrypt in class Cipher
engineInitDecrypt
public void engineInitDecrypt(Key key) throws KeyException
- SPI: Initializes this cipher for decryption, using the
specified key.
- Parameters:
- key - the key to use for decryption.
- Throws: KeyException
- if the key is invalid.
- Overrides:
- engineInitDecrypt in class Cipher
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.
- 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.
- Overrides:
- engineUpdate in class Cipher
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