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XSalsa20.php (1371B)

      1 <?php
      2 
      3 if (class_exists('ParagonIE_Sodium_Core_XSalsa20', false)) {
      4     return;
      5 }
      6 
      7 /**
      8  * Class ParagonIE_Sodium_Core_XSalsa20
      9  */
     10 abstract class ParagonIE_Sodium_Core_XSalsa20 extends ParagonIE_Sodium_Core_HSalsa20
     11 {
     12     /**
     13      * Expand a key and nonce into an xsalsa20 keystream.
     14      *
     15      * @internal You should not use this directly from another application
     16      *
     17      * @param int $len
     18      * @param string $nonce
     19      * @param string $key
     20      * @return string
     21      * @throws SodiumException
     22      * @throws TypeError
     23      */
     24     public static function xsalsa20($len, $nonce, $key)
     25     {
     26         $ret = self::salsa20(
     27             $len,
     28             self::substr($nonce, 16, 8),
     29             self::hsalsa20($nonce, $key)
     30         );
     31         return $ret;
     32     }
     33 
     34     /**
     35      * Encrypt a string with XSalsa20. Doesn't provide integrity.
     36      *
     37      * @internal You should not use this directly from another application
     38      *
     39      * @param string $message
     40      * @param string $nonce
     41      * @param string $key
     42      * @return string
     43      * @throws SodiumException
     44      * @throws TypeError
     45      */
     46     public static function xsalsa20_xor($message, $nonce, $key)
     47     {
     48         return self::xorStrings(
     49             $message,
     50             self::xsalsa20(
     51                 self::strlen($message),
     52                 $nonce,
     53                 $key
     54             )
     55         );
     56     }
     57 }