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/**
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/**
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 * Pure-PHP implementation of Salsa20.
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 * Pure-PHP implementation of Salsa20.
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 *
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 *
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 * PHP version 5
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 * PHP version 5
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 *
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 *
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 * @category  Crypt
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 * @package   Salsa20
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 * @author    Jim Wigginton <terrafrost@php.net>
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 * @author    Jim Wigginton <terrafrost@php.net>
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 * @copyright 2019 Jim Wigginton
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 * @copyright 2019 Jim Wigginton
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 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
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 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
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 * @link      http://phpseclib.sourceforge.net
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 * @link      http://phpseclib.sourceforge.net
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 */
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 */
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use phpseclib3\Exception\InsufficientSetupException;
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use phpseclib3\Exception\InsufficientSetupException;
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/**
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/**
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 * Pure-PHP implementation of Salsa20.
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 * Pure-PHP implementation of Salsa20.
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 *
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 *
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 * @package Salsa20
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 * @author  Jim Wigginton <terrafrost@php.net>
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 * @author  Jim Wigginton <terrafrost@php.net>
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 * @access  public
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 */
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 */
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class Salsa20 extends StreamCipher
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class Salsa20 extends StreamCipher
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{
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{
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    /**
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    /**
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     * Part 1 of the state
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     * Part 1 of the state
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     * @var int
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     * @var int
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     */
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     */
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    protected $key_length = 32; // = 256 bits
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    protected $key_length = 32; // = 256 bits
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    /**
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    /**
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     * @access private
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     * @see \phpseclib3\Crypt\Salsa20::crypt()
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     * @see \phpseclib3\Crypt\Salsa20::crypt()
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     */
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     */
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    const ENCRYPT = 0;
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    const ENCRYPT = 0;
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    /**
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    /**
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     * @access private
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     * @see \phpseclib3\Crypt\Salsa20::crypt()
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     * @see \phpseclib3\Crypt\Salsa20::crypt()
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     */
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     */
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    const DECRYPT = 1;
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    const DECRYPT = 1;
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    /**
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    /**
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     * @param int $n
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     * @param int $n
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     * @return int
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     * @return int
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     */
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     */
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    protected static function leftRotate($x, $n)
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    protected static function leftRotate($x, $n)
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    {
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    {
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        $r1 = $x << $n;
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        if (PHP_INT_SIZE == 8) {
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        if (PHP_INT_SIZE == 8) {
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            $r1 = $x << $n;
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            $r1 &= 0xFFFFFFFF;
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            $r1 &= 0xFFFFFFFF;
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            $r2 = ($x & 0xFFFFFFFF) >> (32 - $n);
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            $r2 = ($x & 0xFFFFFFFF) >> (32 - $n);
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        } else {
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        } else {
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            $x = (int) $x;
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            $r1 = $x << $n;
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            $r2 = $x >> (32 - $n);
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            $r2 = $x >> (32 - $n);
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            $r2 &= (1 << $n) - 1;
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            $r2 &= (1 << $n) - 1;
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        }
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        }
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        return $r1 | $r2;
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        return $r1 | $r2;
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    }
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    }
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    /**
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    /**
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     * Calculates Poly1305 MAC
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     * Calculates Poly1305 MAC
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     *
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     *
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     * @see self::decrypt()
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     * @see self::decrypt()
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     * @see self::encrypt()
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     * @see self::encrypt()
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     * @access private
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     * @param string $ciphertext
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     * @param string $ciphertext
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     * @return string
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     * @return string
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     */
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     */
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    protected function poly1305($ciphertext)
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    protected function poly1305($ciphertext)
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    {
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    {