Top Description Fields Constructors Methods
org.bouncycastle.crypto.engines

public Class XTEAEngine

extends Object
implements BlockCipher
Class Inheritance
All Implemented Interfaces
org.bouncycastle.crypto.BlockCipher
Imports
org.bouncycastle.crypto.BlockCipher, .CipherParameters, .CryptoServicesRegistrar, .DataLengthException, .OutputLengthException, org.bouncycastle.crypto.constraints.DefaultServiceProperties, org.bouncycastle.crypto.params.KeyParameter
An XTEA engine.

Field Summary

Modifier and TypeField and Description
private boolean
_forEncryption

private boolean
_initialised

private int[]
_S

private int[]
_sum0

private int[]
_sum1

private static final int
block_size

private static final int
delta

private static final int
rounds

Constructor Summary

AccessConstructor and Description
public
XTEAEngine()

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

Method Summary

Modifier and TypeMethod and Description
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)

public String
getAlgorithmName()

Implements org.bouncycastle.crypto.BlockCipher.getAlgorithmName.

Return the name of the algorithm the cipher implements.
public int
getBlockSize()

Implements org.bouncycastle.crypto.BlockCipher.getBlockSize.

Return the block size for this cipher (in bytes).
public void
init(boolean
whether or not we are for encryption.
forEncryption, CipherParameters
the parameters required to set up the cipher.
params)

Implements org.bouncycastle.crypto.BlockCipher.init.

initialise
public int
processBlock(byte[]
the array containing the input data.
in, int
offset into the in array the data starts at.
inOff, byte[]
the array the output data will be copied into.
out, int
the offset into the out array the output will start at.
outOff)

Implements org.bouncycastle.crypto.BlockCipher.processBlock.

Process one block of input from the array in and write it to the out array.
public void
reset()

Implements org.bouncycastle.crypto.BlockCipher.reset.

Reset the cipher.
private void
setKey(byte[]
the key to be used
key)

Re-key the cipher.

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

Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

_forEncryptionback to summary
private boolean _forEncryption
_initialisedback to summary
private boolean _initialised
_Sback to summary
private int[] _S
_sum0back to summary
private int[] _sum0
_sum1back to summary
private int[] _sum1
block_sizeback to summary
private static final int block_size
deltaback to summary
private static final int delta
roundsback to summary
private static final int rounds

Constructor Detail

XTEAEngineback to summary
public XTEAEngine()

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

Method Detail

bytesToIntback to summary
private int bytesToInt(byte[] in, int inOff)
decryptBlockback to summary
private int decryptBlock(byte[] in, int inOff, byte[] out, int outOff)
encryptBlockback to summary
private int encryptBlock(byte[] in, int inOff, byte[] out, int outOff)
getAlgorithmNameback to summary
public String getAlgorithmName()

Implements org.bouncycastle.crypto.BlockCipher.getAlgorithmName.

Doc from org.bouncycastle.crypto.BlockCipher.getAlgorithmName.

Return the name of the algorithm the cipher implements.

Returns:String

the name of the algorithm the cipher implements.

getBlockSizeback to summary
public int getBlockSize()

Implements org.bouncycastle.crypto.BlockCipher.getBlockSize.

Doc from org.bouncycastle.crypto.BlockCipher.getBlockSize.

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

Returns:int

the block size for this cipher in bytes.

initback to summary
public void init(boolean forEncryption, CipherParameters params)

Implements org.bouncycastle.crypto.BlockCipher.init.

initialise

Parameters
forEncryption:boolean

whether or not we are for encryption.

params:CipherParameters

the parameters required to set up the cipher.

Exceptions
IllegalArgumentException:
if the params argument is inappropriate.
processBlockback to summary
public int processBlock(byte[] in, int inOff, byte[] out, int outOff)

Implements org.bouncycastle.crypto.BlockCipher.processBlock.

Doc from org.bouncycastle.crypto.BlockCipher.processBlock.

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

Parameters
in:byte[]

the array containing the input data.

inOff:int

offset into the in array the data starts at.

out:byte[]

the array the output data will be copied into.

outOff:int

the offset into the out array the output will start at.

Returns:int

the number of bytes processed and produced.

resetback to summary
public void reset()

Implements org.bouncycastle.crypto.BlockCipher.reset.

Doc from org.bouncycastle.crypto.BlockCipher.reset.

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

setKeyback to summary
private void setKey(byte[] key)

Re-key the cipher.

Parameters
key:byte[]

the key to be used

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