public class

AESFastEngine

extends Object
implements BlockCipher
java.lang.Object
   ↳ org.bouncycastle.crypto.engines.AESFastEngine

Class Overview

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

Summary

Public Constructors
AESFastEngine()
default constructor - 128 bit block size.
Public Methods
String getAlgorithmName()
Return the name of the algorithm the cipher implements.
int getBlockSize()
Return the block size for this cipher (in bytes).
void init(boolean forEncryption, CipherParameters params)
initialise an AES cipher.
int processBlock(byte[] in, int inOff, byte[] out, int outOff)
Process one block of input from the array in and write it to the out array.
void reset()
Reset the cipher.
[Expand]
Inherited Methods
From class java.lang.Object
From interface org.bouncycastle.crypto.BlockCipher

Public Constructors

public AESFastEngine ()

default constructor - 128 bit block size.

Public Methods

public String getAlgorithmName ()

Return the name of the algorithm the cipher implements.

Returns
  • the name of the algorithm the cipher implements.

public int getBlockSize ()

Return the block size for this cipher (in bytes).

Returns
  • the block size for this cipher in bytes.

public void init (boolean forEncryption, CipherParameters params)

initialise an AES cipher.

Parameters
forEncryption whether or not we are for encryption.
params the parameters required to set up the cipher.
Throws
IllegalArgumentException if the params argument is inappropriate.

public int processBlock (byte[] in, int inOff, byte[] out, int outOff)

Process one block of input from the array in and write it to the out array.

Parameters
in the array containing the input data.
inOff offset into the in array the data starts at.
out the array the output data will be copied into.
outOff the offset into the out array the output will start at.
Returns
  • the number of bytes processed and produced.

public void reset ()

Reset the cipher. After resetting the cipher is in the same state as it was after the last init (if there was one).