ParagonIE_Sodium_Core_XSalsa20

10abstract class ParagonIE_Sodium_Core_XSalsa20 extends ParagonIE_Sodium_Core_HSalsa2011{12    /**13     * Expand a key and nonce into an xsalsa20 keystream.14     *15     * @internal You should not use this directly from another application16     *17     * @param int $len18     * @param string $nonce19     * @param string $key20     * @return string21     * @throws SodiumException22     * @throws TypeError23     */24    public static function xsalsa20($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 application38     *39     * @param string $message40     * @param string $nonce41     * @param string $key42     * @return string43     * @throws SodiumException44     * @throws TypeError45     */46    public static function xsalsa20_xor($message, $nonce, $key)47    {48        return self::xorStrings(49            $message,50            self::xsalsa20(51                self::strlen($message),52                $nonce,53                $key54            )55        );56    }57}