org.spongycastle.crypto.engines

Class ChaCha7539Engine

java.lang.Object

org.spongycastle.crypto.engines.Salsa20Engine

org.spongycastle.crypto.engines.ChaCha7539Engine

All Implemented Interfaces:

SkippingCipher, SkippingStreamCipher, StreamCipher

public class ChaCha7539Engine
extends Salsa20Engine

Implementation of Daniel J. Bernstein's ChaCha stream cipher.

Field Summary

Fields inherited from class org.spongycastle.crypto.engines.Salsa20Engine

DEFAULT_ROUNDS, engineState, rounds, sigma, tau, x

Constructor Summary

Constructors

Constructor and Description
ChaCha7539Engine() Creates a 20 rounds ChaCha engine.

Method Summary

Modifier and Type	Method and Description
protected void	advanceCounter()
protected void	advanceCounter(long diff)
protected void	generateKeyStream(byte[] output)
java.lang.String	getAlgorithmName() Return the name of the algorithm the cipher implements.
protected long	getCounter()
protected int	getNonceSize()
protected void	resetCounter()
protected void	retreatCounter()
protected void	retreatCounter(long diff)
protected void	setKey(byte[] keyBytes, byte[] ivBytes)

Methods inherited from class org.spongycastle.crypto.engines.Salsa20Engine

getPosition, init, packTauOrSigma, processBytes, reset, returnByte, rotl, salsaCore, seekTo, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

ChaCha7539Engine

public ChaCha7539Engine()

Creates a 20 rounds ChaCha engine.

Method Detail

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

Overrides:

getAlgorithmName in class Salsa20Engine

Returns:

the name of the algorithm the cipher implements.

getNonceSize

protected int getNonceSize()

Overrides:

getNonceSize in class Salsa20Engine

advanceCounter

protected void advanceCounter(long diff)

Overrides:

advanceCounter in class Salsa20Engine

advanceCounter

protected void advanceCounter()

Overrides:

advanceCounter in class Salsa20Engine

retreatCounter

protected void retreatCounter(long diff)

Overrides:

retreatCounter in class Salsa20Engine

retreatCounter

protected void retreatCounter()

Overrides:

retreatCounter in class Salsa20Engine

getCounter

protected long getCounter()

Overrides:

getCounter in class Salsa20Engine

resetCounter

protected void resetCounter()

Overrides:

resetCounter in class Salsa20Engine

setKey

protected void setKey(byte[] keyBytes,
                      byte[] ivBytes)

Overrides:

setKey in class Salsa20Engine

generateKeyStream

protected void generateKeyStream(byte[] output)

Overrides:

generateKeyStream in class Salsa20Engine