org.spongycastle.crypto.modes

Class KXTSBlockCipher

java.lang.Object

org.spongycastle.crypto.BufferedBlockCipher

org.spongycastle.crypto.modes.KXTSBlockCipher

public class KXTSBlockCipher
extends BufferedBlockCipher

Implementation of DSTU7624 XTS mode

Field Summary

Fields inherited from class org.spongycastle.crypto.BufferedBlockCipher

buf, bufOff, cipher, forEncryption, partialBlockOkay, pgpCFB

Constructor Summary

Constructors

Constructor and Description
KXTSBlockCipher(BlockCipher cipher)

Method Summary

Modifier and Type	Method and Description
int	doFinal(byte[] output, int outOff) Process the last block in the buffer.
int	getOutputSize(int length) return the size of the output buffer required for an update plus a doFinal with an input of 'length' bytes.
protected static long	getReductionPolynomial(int blockSize)
int	getUpdateOutputSize(int len) return the size of the output buffer required for an update an input of len bytes.
void	init(boolean forEncryption, CipherParameters parameters) initialise the cipher.
int	processByte(byte in, byte[] out, int outOff) process a single byte, producing an output block if necessary.
int	processBytes(byte[] input, int inOff, int len, byte[] output, int outOff) process an array of bytes, producing output if necessary.
void	reset() Reset the buffer and cipher.

Methods inherited from class org.spongycastle.crypto.BufferedBlockCipher

getBlockSize, getUnderlyingCipher

Methods inherited from class java.lang.Object

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

Constructor Detail

KXTSBlockCipher

public KXTSBlockCipher(BlockCipher cipher)

Method Detail

getReductionPolynomial

protected static long getReductionPolynomial(int blockSize)

getOutputSize

public int getOutputSize(int length)

Description copied from class: BufferedBlockCipher

return the size of the output buffer required for an update plus a doFinal with an input of 'length' bytes.

Overrides:

getOutputSize in class BufferedBlockCipher

Parameters:

length - the length of the input.

Returns:

the space required to accommodate a call to update and doFinal with 'length' bytes of input.

getUpdateOutputSize

public int getUpdateOutputSize(int len)

Description copied from class: BufferedBlockCipher

return the size of the output buffer required for an update an input of len bytes.

Overrides:

getUpdateOutputSize in class BufferedBlockCipher

Parameters:

len - the length of the input.

Returns:

the space required to accommodate a call to update with len bytes of input.

init

public void init(boolean forEncryption,
                 CipherParameters parameters)

Description copied from class: BufferedBlockCipher

initialise the cipher.

Overrides:

init in class BufferedBlockCipher

Parameters:

forEncryption - if true the cipher is initialised for encryption, if false for decryption.

parameters - the key and other data required by the cipher.

processByte

public int processByte(byte in,
                       byte[] out,
                       int outOff)

Description copied from class: BufferedBlockCipher

process a single byte, producing an output block if necessary.

Overrides:

processByte in class BufferedBlockCipher

Parameters:

in - the input byte.

out - the space for any output that might be produced.

outOff - the offset from which the output will be copied.

Returns:

the number of output bytes copied to out.

processBytes

public int processBytes(byte[] input,
                        int inOff,
                        int len,
                        byte[] output,
                        int outOff)

Description copied from class: BufferedBlockCipher

process an array of bytes, producing output if necessary.

Overrides:

processBytes in class BufferedBlockCipher

Parameters:

input - the input byte array.

inOff - the offset at which the input data starts.

len - the number of bytes to be copied out of the input array.

output - the space for any output that might be produced.

outOff - the offset from which the output will be copied.

Returns:

the number of output bytes copied to out.

doFinal

public int doFinal(byte[] output,
                   int outOff)

Description copied from class: BufferedBlockCipher

Process the last block in the buffer.

Overrides:

doFinal in class BufferedBlockCipher

Parameters:

output - the array the block currently being held is copied into.

outOff - the offset at which the copying starts.

Returns:

the number of output bytes copied to out.

reset

public void reset()

Description copied from class: BufferedBlockCipher

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

Overrides:

reset in class BufferedBlockCipher