cryptix.provider.cipher
Class RC4
- Parameterized, 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: 1.5 $
- Raif S. Naffah
- David Hopwood
RC4() - Constructs an RC4 cipher object, in the UNINITIALIZED state.
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Object | clone() - Always throws a CloneNotSupportedException (cloning of ciphers is not
supported for security reasons).
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int | engineBlockSize() - SPI: Returns the length of an input block, in bytes.
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void | engineInitDecrypt(Key key) - SPI: Initializes this cipher for decryption, using the
specified key.
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void | engineInitEncrypt(Key key) - SPI: Initializes this cipher for encryption, using the
specified key.
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protected int | engineUpdate(byte[] in, int inOffset, int inLen, byte[] out, int outOffset) - SPI: This is the main engine method for updating data.
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protected void | finalize() - Cleans up resources used by this instance, if necessary.
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static LinkStatus | getLinkStatus()
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blockSize , clone , crypt , crypt , crypt , doFinal , doFinal , doFinal , doFinal , engineBlockSize , engineCiphertextBlockSize , engineCrypt , engineGetParameter , engineInBufferSize , engineInitDecrypt , engineInitEncrypt , engineOutBufferSize , enginePlaintextBlockSize , engineSetPaddingScheme , engineSetParameter , engineUpdate , getAlgorithm , getAlgorithms , getAlgorithms , getCiphertextBlockSize , getInputBlockSize , getInstance , getInstance , getInstance , getMode , getOutputBlockSize , getPadding , getPaddingScheme , getParameter , getPlaintextBlockSize , getProvider , getState , inBufferSize , inBufferSizeFinal , initDecrypt , initEncrypt , isPaddingBlockCipher , outBufferSize , outBufferSizeFinal , setParameter , toString , update , update , update , update |
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".
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 InvalidKeyException
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 InvalidKeyException
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()