| java.lang.Object
 org.bouncycastle.crypto.engines.AESFastEngine
| AESFastEngine | | public class AESFastEngine 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
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| Constructor Summary | |
| public | AESFastEngine()
default constructor - 128 bit block size. |
| AESFastEngine | | public AESFastEngine()(Code) | | default constructor - 128 bit block size.
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| getBlockSize | | public int getBlockSize()(Code) | | |
| init | | public void init(boolean forEncryption, CipherParameters params)(Code) | | initialise an AES cipher.
Parameters:
forEncryption - whether or not we are for encryption.
Parameters:
params - the parameters required to set up the cipher.
exception:
IllegalArgumentException - if the params argument isinappropriate. |
| processBlock | | public int processBlock(byte[] in, int inOff, byte[] out, int outOff)(Code) | | |
| reset | | public void reset()(Code) | | |
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