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java.lang.Objectorg.clazzes.optional.sec.AESCipher
public class AESCipher
Implementation of AES base copied from bouncycastle's AESFastEngine. 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
Constructor Summary | |
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AESCipher()
default constructor - 128 bit block size. |
Method Summary | |
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java.lang.String |
getAlgorithmName()
Return the name of the algorithm the cipher implements. |
int |
getBlockSize()
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BlockCipher |
getUnderlyingCipher()
return the underlying block cipher that we are wrapping or null , if we do wrap another cipher. |
void |
init(byte[] key,
boolean useForEncryption)
initialise an AES cipher. |
int |
processBlock(byte[] in,
int inOff,
byte[] out,
int outOff)
Proceed the next block of BlockCipher.getBlockSize() bytes from the input. |
void |
reset()
Reset this cipher to state of the last call to #init(byte[], byte[], boolean) . |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public AESCipher()
Method Detail |
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public void init(byte[] key, boolean useForEncryption)
init
in interface BlockCipher
useForEncryption
- whether or not we are for encryption.params
- the parameters required to set up the cipher.public java.lang.String getAlgorithmName()
BlockCipher
getAlgorithmName
in interface BlockCipher
public int getBlockSize()
getBlockSize
in interface BlockCipher
BlockCipher.processBlock(byte[], int, byte[], int)
operation.public int processBlock(byte[] in, int inOff, byte[] out, int outOff)
BlockCipher
BlockCipher.getBlockSize()
bytes from the input.
processBlock
in interface BlockCipher
in
- The buffer where the input is stored.
BlockCipher.getBlockSize()
bytes starting with in_off
will be consumed.inOff
- The offset at which the input data starts.out
- The buffer where the output is stored.
BlockCipher.getBlockSize()
bytes starting with out_off
will be written.outOff
- The offset at which the output will be stored.
public void reset()
BlockCipher
#init(byte[], byte[], boolean)
.
reset
in interface BlockCipher
public BlockCipher getUnderlyingCipher()
BlockCipher
null
, if we do wrap another cipher.
getUnderlyingCipher
in interface BlockCipher
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