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Class cryptix.provider.cipher.RC4
java.lang.Object
|
+----java.security.IJCE_Traceable
|
+----java.security.Cipher
|
+----cryptix.provider.cipher.RC4
- public final class RC4
- extends Cipher
- implements SymmetricCipher
This class implements the RC4 (TM) stream cipher.
The source code (C version) from which this port was done, is the one
posted to the sci.crypt, alt.security, comp.security.misc, and
alt.privacy newsgroups on Wed, 14 Sep 1994 06:35:31 GMT by
"David Sterndark" <sterndark@netcom.com>
(Message-ID: <sternCvKL4B.Hyy@netcom.com>)
RC4 (TM) was designed by Ron Rivest, and was previously a trade secret of
RSA Data Security, Inc. The algorithm is now in the public domain. The name
"RC4" is a trademark of RSA Data Security, Inc.
References:
- Bruce Schneier,
"Section 17.1 RC4,"
Applied Cryptography, 2nd edition,
John Wiley & Sons, 1996.
Copyright © 1997
Systemics Ltd on behalf of the
Cryptix Development Team.
All rights reserved.
$Revision: 1.3 $
- Author:
- Raif S. Naffah, David Hopwood
-
RC4()
- Constructs an RC4 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()
-
RC4
public RC4()
- Constructs an RC4 cipher object, in the UNINITIALIZED state.
This calls the Cipher constructor with implBuffering false,
implPadding false and the provider set to "Cryptix".
getLinkStatus
public static LinkStatus getLinkStatus()
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 InvalidKeyException
- SPI: Initializes this cipher for encryption, using the
specified key.
- Parameters:
- key - the key to use for encryption.
- Throws: InvalidKeyException
- if the key is invalid.
- Overrides:
- engineInitEncrypt in class Cipher
engineInitDecrypt
public void engineInitDecrypt(Key key) throws InvalidKeyException
- SPI: Initializes this cipher for decryption, using the
specified key.
- Parameters:
- key - the key to use for decryption.
- Throws: InvalidKeyException
- 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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