Class SICBlockCipher

java.lang.Object

org.gudy.bouncycastle.crypto.modes.SICBlockCipher

All Implemented Interfaces:

BlockCipher

public class SICBlockCipher
extends Object
implements BlockCipher

Implements the Segmented Integer Counter (SIC) mode on top of a simple block cipher. This mode is also known as CTR mode.

Field Summary

Fields

Modifier and Type	Field	Description
private int	blockSize
private BlockCipher	cipher
private byte[]	counter
private byte[]	counterOut
private boolean	encrypting
private byte[]	IV

Constructor Summary

Constructors

Constructor	Description
SICBlockCipher(BlockCipher c)	Basic constructor.

Method Summary

Modifier and Type	Method	Description
String	getAlgorithmName()	Return the name of the algorithm the cipher implements.
int	getBlockSize()	Return the block size for this cipher (in bytes).
BlockCipher	getUnderlyingCipher()	return the underlying block cipher that we are wrapping.
void	init(boolean forEncryption, CipherParameters params)	Initialise the cipher.
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.

Methods inherited from class Object

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

Field Details

cipher

private BlockCipher cipher

blockSize

private int blockSize

IV

private byte[] IV

counter

private byte[] counter

counterOut

private byte[] counterOut

encrypting

private boolean encrypting

Constructor Details

SICBlockCipher

public SICBlockCipher(BlockCipher c)

Basic constructor.

Parameters:

c - the block cipher to be used.

Method Details

getUnderlyingCipher

public BlockCipher getUnderlyingCipher()

return the underlying block cipher that we are wrapping.

Returns:

the underlying block cipher that we are wrapping.

init

public void init(boolean forEncryption,
 CipherParameters params)
          throws IllegalArgumentException

Description copied from interface: BlockCipher

Initialise the cipher.

Specified by:

init in interface BlockCipher

Parameters:

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

Throws:

IllegalArgumentException - if the params argument is inappropriate.

getAlgorithmName

public 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.

processBlock

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

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.

Throws:

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

IllegalStateException - if the cipher isn't initialised.

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