org.bouncycastle.crypto.engines
Class RC4Engine

java.lang.Object
  org.bouncycastle.crypto.engines.RC4Engine

All Implemented Interfaces:

StreamCipher

public class RC4Engine
extends java.lang.Object
implements StreamCipher

Field Summary

private byte[]	engineState
private static int	STATE_LENGTH
private byte[]	workingKey
private int	x
private int	y

Constructor Summary

RC4Engine()

Method Summary

java.lang.String	getAlgorithmName() Return the name of the algorithm the cipher implements.
void	init(boolean forEncryption, CipherParameters params) initialise a RC4 cipher.
void	processBytes(byte[] in, int inOff, int len, byte[] out, int outOff) process a block of bytes from in putting the result into out.
void	reset() reset the cipher.
byte	returnByte(byte in) encrypt/decrypt a single byte returning the result.
private void	setKey(byte[] keyBytes)

Methods inherited from class java.lang.Object

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

Field Detail

STATE_LENGTH

private static final int STATE_LENGTH

See Also:

Constant Field Values

engineState

private byte[] engineState

x

private int x

y

private int y

workingKey

private byte[] workingKey

Constructor Detail

RC4Engine

public RC4Engine()

Method Detail

init

public void init(boolean forEncryption,
                 CipherParameters params)

initialise a RC4 cipher.

Specified by:

init in interface StreamCipher

Parameters:

forEncryption - 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.

getAlgorithmName

public java.lang.String getAlgorithmName()

Description copied from interface: StreamCipher

Return the name of the algorithm the cipher implements.

Specified by:

getAlgorithmName in interface StreamCipher

Returns:

the name of the algorithm the cipher implements.

returnByte

public byte returnByte(byte in)

Description copied from interface: StreamCipher

encrypt/decrypt a single byte returning the result.

Specified by:

returnByte in interface StreamCipher

Parameters:

in - the byte to be processed.

Returns:

the result of processing the input byte.

processBytes

public void processBytes(byte[] in,
                         int inOff,
                         int len,
                         byte[] out,
                         int outOff)

Description copied from interface: StreamCipher

process a block of bytes from in putting the result into out.

Specified by:

processBytes in interface StreamCipher

Parameters:

in - the input byte array.

inOff - the offset into the in array where the data to be processed starts.

len - the number of bytes to be processed.

out - the output buffer the processed bytes go into.

outOff - the offset into the output byte array the processed data starts at.

reset

public void reset()

Description copied from interface: StreamCipher

reset the cipher. This leaves it in the same state it was at after the last init (if there was one).

Specified by:

reset in interface StreamCipher

setKey

private void setKey(byte[] keyBytes)