<?php

if (class_exists('ParagonIE_Sodium_Core_Poly1305', false)) {

    return;

}

/**

 * Class ParagonIE_Sodium_Core_Poly1305

 */

abstract class ParagonIE_Sodium_Core_Poly1305 extends ParagonIE_Sodium_Core_Util

{

    const BLOCK_SIZE = 16;

    /**

     * @internal You should not use this directly from another application

     *

     * @param string $m

     * @param string $key

     * @return string

     * @throws SodiumException

     * @throws TypeError

     */

    public static function onetimeauth($m, $key)

    {

        if (self::strlen($key) < 32) {

            throw new InvalidArgumentException(

                'Key must be 32 bytes long.'

            );

        }

        $state = new ParagonIE_Sodium_Core_Poly1305_State(

            self::substr($key, 0, 32)

        );

        return $state

            ->update($m)

            ->finish();

    }

    /**

     * @internal You should not use this directly from another application

     *

     * @param string $mac

     * @param string $m

     * @param string $key

     * @return bool

     * @throws SodiumException

     * @throws TypeError

     */

    public static function onetimeauth_verify($mac, $m, $key)

    {

        if (self::strlen($key) < 32) {

            throw new InvalidArgumentException(

                'Key must be 32 bytes long.'

            );

        }

        $state = new ParagonIE_Sodium_Core_Poly1305_State(

            self::substr($key, 0, 32)

        );

        $calc = $state

            ->update($m)

            ->finish();

        return self::verify_16($calc, $mac);

    }

}