org.bouncycastle.crypto.engines
Class Salsa20Engine

java.lang.Object
  org.bouncycastle.crypto.engines.Salsa20Engine

All Implemented Interfaces:

StreamCipher

public class Salsa20Engine
extends java.lang.Object
implements StreamCipher

Implementation of Daniel J. Bernstein's Salsa20 stream cipher, Snuffle 2005

Constructor Summary

Salsa20Engine()

Method Summary

java.lang.String	getAlgorithmName() Return the name of the algorithm the cipher implements.
void	init(boolean forEncryption, CipherParameters params) initialise a Salsa20 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

Salsa20Engine

public Salsa20Engine()

Method Detail

init

public void init(boolean forEncryption,
                 CipherParameters params)

initialise a Salsa20 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