org.gudy.bouncycastle.crypto.modes
Class SICBlockCipher

java.lang.Object
  extended by org.gudy.bouncycastle.crypto.modes.SICBlockCipher
All 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
 java.lang.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 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

SICBlockCipher

public SICBlockCipher(BlockCipher c)
Basic constructor.

Parameters:
c - the block cipher to be used.
Method Detail

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

getAlgorithmName

public java.lang.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,
                        java.lang.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.
java.lang.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