org.bouncycastle.crypto.modes
Class KXTSBlockCipher

java.lang.Object
  |
  +--org.bouncycastle.crypto.BufferedBlockCipher
        |
        +--org.bouncycastle.crypto.DefaultBufferedBlockCipher
              |
              +--org.bouncycastle.crypto.modes.KXTSBlockCipher

public class KXTSBlockCipher

extends DefaultBufferedBlockCipher

Implementation of DSTU7624 XTS mode

Fields inherited from class org.bouncycastle.crypto.DefaultBufferedBlockCipher

buf, bufOff, cipher, forEncryption, mbCipher, partialBlockOkay, pgpCFB

Constructor Summary

KXTSBlockCipher(BlockCipher cipher)

Method Summary

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.bouncycastle.crypto.DefaultBufferedBlockCipher

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: DefaultBufferedBlockCipher

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

Overrides:

getOutputSize in class DefaultBufferedBlockCipher

Following copied from class: org.bouncycastle.crypto.DefaultBufferedBlockCipher

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: DefaultBufferedBlockCipher

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

Overrides:

getUpdateOutputSize in class DefaultBufferedBlockCipher

Following copied from class: org.bouncycastle.crypto.DefaultBufferedBlockCipher

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: DefaultBufferedBlockCipher

initialise the cipher.

Overrides:

init in class DefaultBufferedBlockCipher

Following copied from class: org.bouncycastle.crypto.DefaultBufferedBlockCipher

Parameters:

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

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

Throws:

java.lang.IllegalArgumentException - if the params argument is inappropriate.

processByte

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

Description copied from class: DefaultBufferedBlockCipher

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

Overrides:

processByte in class DefaultBufferedBlockCipher

Following copied from class: org.bouncycastle.crypto.DefaultBufferedBlockCipher

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.

Throws:

DataLengthException - if there isn't enough space in out.

java.lang.IllegalStateException - if the cipher isn't initialised.

processBytes

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

Description copied from class: DefaultBufferedBlockCipher

process an array of bytes, producing output if necessary.

Overrides:

processBytes in class DefaultBufferedBlockCipher

Following copied from class: org.bouncycastle.crypto.DefaultBufferedBlockCipher

Parameters:

in - 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.

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.

Throws:

DataLengthException - if there isn't enough space in out.

java.lang.IllegalStateException - if the cipher isn't initialised.

doFinal

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

Description copied from class: DefaultBufferedBlockCipher

Process the last block in the buffer.

Overrides:

doFinal in class DefaultBufferedBlockCipher

Following copied from class: org.bouncycastle.crypto.DefaultBufferedBlockCipher

Parameters:

out - 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.

Throws:

DataLengthException - if there is insufficient space in out for the output, or the input is not block size aligned and should be.

java.lang.IllegalStateException - if the underlying cipher is not initialised.

InvalidCipherTextException - if padding is expected and not found.

DataLengthException - if the input is not block size aligned.

reset

public void reset()

Description copied from class: DefaultBufferedBlockCipher

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 DefaultBufferedBlockCipher