org.bouncycastle.crypto.engines
Class XTEAEngine

java.lang.Object
  org.bouncycastle.crypto.engines.XTEAEngine

All Implemented Interfaces:

BlockCipher

public class XTEAEngine
extends java.lang.Object
implements BlockCipher

An XTEA engine.

Field Summary

private boolean	_forEncryption
private boolean	_initialised
private int[]	_S
private static int	block_size
private static int	d_sum
private static int	delta
private static int	key_size
private static int	rounds

Constructor Summary

XTEAEngine()
Create an instance of the TEA encryption algorithm and set some defaults

Method Summary

private int	bytesToInt(byte[] in, int inOff)
private int	decryptBlock(byte[] in, int inOff, byte[] out, int outOff)
private int	encryptBlock(byte[] in, int inOff, byte[] out, int outOff)
java.lang.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
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.
private void	setKey(byte[] key) Re-key the cipher.
private void	unpackInt(int v, byte[] out, int outOff)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

rounds

private static final int rounds

See Also:

Constant Field Values

block_size

private static final int block_size

See Also:

Constant Field Values

key_size

private static final int key_size

See Also:

Constant Field Values

delta

private static final int delta

See Also:

Constant Field Values

d_sum

private static final int d_sum

See Also:

Constant Field Values

_S

private int[] _S

_initialised

private boolean _initialised

_forEncryption

private boolean _forEncryption

Constructor Detail

XTEAEngine

public XTEAEngine()

Create an instance of the TEA encryption algorithm and set some defaults

Method Detail

getAlgorithmName

public java.lang.String getAlgorithmName()

Description copied from interface: BlockCipher

Return the name of the algorithm the cipher implements.

Specified by:

getAlgorithmName in interface BlockCipher

Returns:

the name of the algorithm the cipher implements.

getBlockSize

public int getBlockSize()

Description copied from interface: BlockCipher

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

Specified by:

getBlockSize in interface BlockCipher

Returns:

the block size for this cipher in bytes.

init

public void init(boolean forEncryption,
                 CipherParameters params)

initialise

Specified by:

init in interface BlockCipher

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.

processBlock

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

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 interface BlockCipher

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.

reset

public void reset()

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 interface BlockCipher

setKey

private void setKey(byte[] key)

Re-key the cipher.

Parameters:

key - the key to be used

encryptBlock

private int encryptBlock(byte[] in,
                         int inOff,
                         byte[] out,
                         int outOff)

decryptBlock

private int decryptBlock(byte[] in,
                         int inOff,
                         byte[] out,
                         int outOff)

bytesToInt

private int bytesToInt(byte[] in,
                       int inOff)

unpackInt

private void unpackInt(int v,
                       byte[] out,
                       int outOff)