public class

AES

extends Object
implements BlockCipher
java.lang.Object
   ↳ com.trilead.ssh2.crypto.cipher.AES

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

Constants
int BLOCK_SIZE
int m1
int m2
int m3
Fields
private int C0
private int C1
private int C2
private int C3
private int ROUNDS
private static final byte[] S
private static final byte[] Si
private static final int[] T0
private static final int[] T1
private static final int[] T2
private static final int[] T3
private static final int[] Tinv0
private static final int[] Tinv1
private static final int[] Tinv2
private static final int[] Tinv3
private int[][] WorkingKey
private boolean doEncrypt
private static final int[] rcon
Public Constructors
AES()
default constructor - 128 bit block size.
Public Methods
final String getAlgorithmName()
final int getBlockSize()
final void init(boolean forEncryption, byte[] key)
initialise an AES cipher.
final int processBlock(byte[] in, int inOff, byte[] out, int outOff)
final void reset()
void transformBlock(byte[] src, int srcoff, byte[] dst, int dstoff)
[Expand]
Inherited Methods
From class java.lang.Object
From interface com.trilead.ssh2.crypto.cipher.BlockCipher

Constants

private static final int BLOCK_SIZE

Constant Value: 16 (0x00000010)

private static final int m1

Constant Value: -2139062144 (0x80808080)

private static final int m2

Constant Value: 2139062143 (0x7f7f7f7f)

private static final int m3

Constant Value: 27 (0x0000001b)

Fields

private int C0

private int C1

private int C2

private int C3

private int ROUNDS

private static final byte[] S

private static final byte[] Si

private static final int[] T0

private static final int[] T1

private static final int[] T2

private static final int[] T3

private static final int[] Tinv0

private static final int[] Tinv1

private static final int[] Tinv2

private static final int[] Tinv3

private int[][] WorkingKey

private boolean doEncrypt

private static final int[] rcon

Public Constructors

public AES ()

default constructor - 128 bit block size.

Public Methods

public final String getAlgorithmName ()

public final int getBlockSize ()

public final void init (boolean forEncryption, byte[] key)

initialise an AES cipher.

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

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

Parameters
in
inOff
out
outOff

public final void reset ()

public void transformBlock (byte[] src, int srcoff, byte[] dst, int dstoff)

Parameters
src
srcoff
dst
dstoff