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File: src/Core32/XSalsa20.php

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  Classes of Scott Arciszewski  >  PHP Sodium Compat  >  src/Core32/XSalsa20.php  >  Download  
File: src/Core32/XSalsa20.php
Role: Class source
Content type: text/plain
Description: Class source
Class: PHP Sodium Compat
Cryptographic functions of libsodium in pure PHP
Author: By
Last change: Fix docblocks.
Date: 5 days ago
Size: 1,379 bytes
 

Contents

Class file image Download
<?php

if (class_exists('ParagonIE_Sodium_Core32_XSalsa20', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core32_XSalsa20
 */
abstract class ParagonIE_Sodium_Core32_XSalsa20 extends ParagonIE_Sodium_Core32_HSalsa20
{
   
/**
     * Expand a key and nonce into an xsalsa20 keystream.
     *
     * @internal You should not use this directly from another application
     *
     * @param int $len
     * @param string $nonce
     * @param string $key
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
   
public static function xsalsa20($len, $nonce, $key)
    {
       
$ret = self::salsa20(
           
$len,
           
self::substr($nonce, 16, 8),
           
self::hsalsa20($nonce, $key)
        );
        return
$ret;
    }

   
/**
     * Encrypt a string with XSalsa20. Doesn't provide integrity.
     *
     * @internal You should not use this directly from another application
     *
     * @param string $message
     * @param string $nonce
     * @param string $key
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
   
public static function xsalsa20_xor($message, $nonce, $key)
    {
        return
self::xorStrings(
           
$message,
           
self::xsalsa20(
               
self::strlen($message),
               
$nonce,
               
$key
           
)
        );
    }
}