org.gudy.bouncycastle.crypto.engines
Class RC4Engine

java.lang.Object
  extended by org.gudy.bouncycastle.crypto.engines.RC4Engine
All Implemented Interfaces:
StreamCipher

public class RC4Engine
extends java.lang.Object
implements StreamCipher


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.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

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 stars 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