org.bouncycastle.crypto.modes

Class SICBlockCipher

Implemented Interfaces:
BlockCipher

public class SICBlockCipher
extends java.lang.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.

Constructor Summary

SICBlockCipher(BlockCipher c)
Basic constructor.

Method Summary

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.

Constructor Details

SICBlockCipher

public SICBlockCipher(BlockCipher c)
Basic constructor.
Parameters:
c - the block cipher to be used.

Method Details

getAlgorithmName

public String getAlgorithmName()
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()
Return the block size for this cipher (in bytes).
Specified by:
getBlockSize in interface BlockCipher
Returns:
the block size for this cipher in bytes.

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
Initialise the cipher.
Specified by:
init in interface BlockCipher
Parameters:
forEncryption - if true the cipher is initialised for encryption, if false for decryption.
params - the key and other data required by the cipher.

processBlock

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

reset

public void reset()
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