Class AESFastEngine
- java.lang.Object
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- org.bouncycastle.crypto.engines.AESFastEngine
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- All Implemented Interfaces:
BlockCipher
public class AESFastEngine extends java.lang.Object implements BlockCipher
Deprecated.unfortunately this class is has a few side channel issues. In an environment where encryption/decryption may be closely observed it should not be used.an implementation of the AES (Rijndael), from FIPS-197.For further details see: https://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
Constructors Constructor Description AESFastEngine()
Deprecated.default constructor - 128 bit block size.
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Method Summary
All Methods Instance Methods Concrete Methods Deprecated Methods Modifier and Type Method Description java.lang.String
getAlgorithmName()
Deprecated.Return the name of the algorithm the cipher implements.int
getBlockSize()
Deprecated.Return the block size for this cipher (in bytes).void
init(boolean forEncryption, CipherParameters params)
Deprecated.initialise an AES cipher.int
processBlock(byte[] in, int inOff, byte[] out, int outOff)
Deprecated.Process one block of input from the array in and write it to the out array.void
reset()
Deprecated.Reset the cipher.
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Method Detail
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init
public void init(boolean forEncryption, CipherParameters params)
Deprecated.initialise an AES cipher.- Specified by:
init
in interfaceBlockCipher
- Parameters:
forEncryption
- whether or not we are for encryption.params
- the parameters required to set up the cipher.- Throws:
java.lang.IllegalArgumentException
- if the params argument is inappropriate.
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getAlgorithmName
public java.lang.String getAlgorithmName()
Deprecated.Description copied from interface:BlockCipher
Return the name of the algorithm the cipher implements.- Specified by:
getAlgorithmName
in interfaceBlockCipher
- Returns:
- the name of the algorithm the cipher implements.
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getBlockSize
public int getBlockSize()
Deprecated.Description copied from interface:BlockCipher
Return the block size for this cipher (in bytes).- Specified by:
getBlockSize
in interfaceBlockCipher
- Returns:
- the block size for this cipher in bytes.
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processBlock
public int processBlock(byte[] in, int inOff, byte[] out, int outOff)
Deprecated.Description copied from interface:BlockCipher
Process one block of input from the array in and write it to the out array.- Specified by:
processBlock
in interfaceBlockCipher
- 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.
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reset
public void reset()
Deprecated.Description copied from interface:BlockCipher
Reset the cipher. After resetting the cipher is in the same state as it was after the last init (if there was one).- Specified by:
reset
in interfaceBlockCipher
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