org.bouncycastle.crypto.engines
Class RC2Engine

java.lang.Object
  org.bouncycastle.crypto.engines.RC2Engine

All Implemented Interfaces:

BlockCipher

public class RC2Engine
extends java.lang.Object
implements BlockCipher

an implementation of RC2 as described in RFC 2268 "A Description of the RC2(r) Encryption Algorithm" R. Rivest.

Field Summary

private static int	BLOCK_SIZE
private boolean	encrypting
private static byte[]	piTable
private int[]	workingKey

Constructor Summary

RC2Engine()

Method Summary

private void	decryptBlock(byte[] in, int inOff, byte[] out, int outOff)
private void	encryptBlock(byte[] in, int inOff, byte[] out, int outOff)
private int[]	generateWorkingKey(byte[] key, int bits)
java.lang.String	getAlgorithmName() Return the name of the algorithm the cipher implements.
int	getBlockSize() Return the block size for this cipher (in bytes).
void	init(boolean encrypting, CipherParameters params) initialise a RC2 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.
private int	rotateWordLeft(int x, int y) return the result rotating the 16 bit number in x left by y

Methods inherited from class java.lang.Object

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

Field Detail

piTable

private static byte[] piTable

BLOCK_SIZE

private static final int BLOCK_SIZE

See Also:

Constant Field Values

workingKey

private int[] workingKey

encrypting

private boolean encrypting

Constructor Detail

RC2Engine

public RC2Engine()

Method Detail

generateWorkingKey

private int[] generateWorkingKey(byte[] key,
                                 int bits)

init

public void init(boolean encrypting,
                 CipherParameters params)

initialise a RC2 cipher.

Specified by:

init in interface BlockCipher

Parameters:

encrypting - whether or not we are for encryption.

params - the parameters required to set up the cipher.

Throws:

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

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

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 final int processBlock(byte[] in,
                              int inOff,
                              byte[] out,
                              int outOff)

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.

rotateWordLeft

private int rotateWordLeft(int x,
                           int y)

return the result rotating the 16 bit number in x left by y

encryptBlock

private void encryptBlock(byte[] in,
                          int inOff,
                          byte[] out,
                          int outOff)

decryptBlock

private void decryptBlock(byte[] in,
                          int inOff,
                          byte[] out,
                          int outOff)