org.spongycastle.crypto.engines

Class XSalsa20Engine

java.lang.Object

org.spongycastle.crypto.engines.Salsa20Engine

org.spongycastle.crypto.engines.XSalsa20Engine

All Implemented Interfaces:

SkippingCipher, SkippingStreamCipher, StreamCipher

public class XSalsa20Engine
extends Salsa20Engine

Implementation of Daniel J. Bernstein's XSalsa20 stream cipher - Salsa20 with an extended nonce.

XSalsa20 requires a 256 bit key, and a 192 bit nonce.

Field Summary

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

DEFAULT_ROUNDS, engineState, rounds, sigma, tau, x

Constructor Summary

Constructors

Constructor and Description
XSalsa20Engine()

Method Summary

Modifier and Type	Method and Description
java.lang.String	getAlgorithmName() Return the name of the algorithm the cipher implements.
protected int	getNonceSize()
protected void	setKey(byte[] keyBytes, byte[] ivBytes) XSalsa20 key generation: process 256 bit input key and 128 bits of the input nonce using a core Salsa20 function without input addition to produce 256 bit working key and use that with the remaining 64 bits of nonce to initialize a standard Salsa20 engine state.

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

advanceCounter, advanceCounter, generateKeyStream, getCounter, getPosition, init, packTauOrSigma, processBytes, reset, resetCounter, retreatCounter, retreatCounter, 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

XSalsa20Engine

public XSalsa20Engine()

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

setKey

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

XSalsa20 key generation: process 256 bit input key and 128 bits of the input nonce using a core Salsa20 function without input addition to produce 256 bit working key and use that with the remaining 64 bits of nonce to initialize a standard Salsa20 engine state.

Overrides:

setKey in class Salsa20Engine