XSalsa20Engine (Bouncy Castle Library 1.68 API Specification)

java.lang.Object
- org.bouncycastle.crypto.engines.Salsa20Engine
- - org.bouncycastle.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.bouncycastle.crypto.engines.Salsa20Engine
  DEFAULT_ROUNDS, engineState, rounds, sigma, tau, x

Constructor Summary

Constructors
Constructor Description

XSalsa20Engine()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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.bouncycastle.crypto.engines.Salsa20Engine
advanceCounter, advanceCounter, generateKeyStream, getCounter, getPosition, init, packTauOrSigma, processBytes, reset, resetCounter, retreatCounter, retreatCounter, returnByte, 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