| java.lang.Object
 ch.ethz.ssh2.crypto.cipher.AES
| AES | | public class AES implements BlockCipher(Code) | | An implementation of the AES (Rijndael), from FIPS-197.
For further details see: http://csrc.nist.gov/encryption/aes/
.
This implementation is based on optimizations from Dr. Brian Gladman's paper
and C code at http://fp.gladman.plus.com/cryptography_technology/rijndael/
There are three levels of tradeoff of speed vs memory Because java has no
preprocessor, they are written as three separate classes from which to choose
The fastest uses 8Kbytes of static tables to precompute round calculations, 4
256 word tables for encryption and 4 for decryption.
The middle performance version uses only one 256 word table for each, for a
total of 2Kbytes, adding 12 rotate operations per round to compute the values
contained in the other tables from the contents of the first
The slowest version uses no static tables at all and computes the values in
each round
This file contains the fast version with 8Kbytes of static tables for round
precomputation
author:
See comments in the source file
version:
$Id: AES.java,v 1.4 2006/02/02 09:11:03 cplattne Exp $ |
| Constructor Summary | |
| public | AES()
default constructor - 128 bit block size. |
| AES | | public AES()(Code) | | default constructor - 128 bit block size.
|
| getAlgorithmName | | final public String getAlgorithmName()(Code) | | |
| getBlockSize | | final public int getBlockSize()(Code) | | |
| init | | final public void init(boolean forEncryption, byte[] key)(Code) | | initialise an AES cipher.
Parameters:
forEncryption - whether or not we are for encryption.
Parameters:
key - the key required to set up the cipher.
exception:
IllegalArgumentException - if the params argument is inappropriate. |
| processBlock | | final public int processBlock(byte[] in, int inOff, byte[] out, int outOff)(Code) | | |
| reset | | final public void reset()(Code) | | |
| transformBlock | | public void transformBlock(byte[] src, int srcoff, byte[] dst, int dstoff)(Code) | | |
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