1<?php
  2
  3if (class_exists('ParagonIE_Sodium_Core_Poly1305', false)) {
  4    return;
  5}
  6
  7/**
  8 * Class ParagonIE_Sodium_Core_Poly1305
  9 */
 10abstract class ParagonIE_Sodium_Core_Poly1305 extends ParagonIE_Sodium_Core_Util
 11{
 12    const BLOCK_SIZE = 16;
 13
 14    /**
 15     * @internal You should not use this directly from another application
 16     *
 17     * @param string $m
 18     * @param string $key
 19     * @return string
 20     * @throws SodiumException
 21     * @throws TypeError
 22     */
 23    public static function onetimeauth($m, $key)
 24    {
 25        if (self::strlen($key) !== 32) {
 26            throw new InvalidArgumentException(
 27                'Key must be 32 bytes long.'
 28            );
 29        }
 30        $state = new ParagonIE_Sodium_Core_Poly1305_State(
 31            self::substr($key, 0, 32)
 32        );
 33        return $state
 34            ->update($m)
 35            ->finish();
 36    }
 37
 38    /**
 39     * @internal You should not use this directly from another application
 40     *
 41     * @param string $mac
 42     * @param string $m
 43     * @param string $key
 44     * @return bool
 45     * @throws SodiumException
 46     * @throws TypeError
 47     */
 48    public static function onetimeauth_verify($mac, $m, $key)
 49    {
 50        if (self::strlen($key) < 32) {
 51            throw new InvalidArgumentException(
 52                'Key must be 32 bytes long.'
 53            );
 54        }
 55        $state = new ParagonIE_Sodium_Core_Poly1305_State(
 56            self::substr($key, 0, 32)
 57        );
 58        $calc = $state
 59            ->update($m)
 60            ->finish();
 61        return self::verify_16($calc, $mac);
 62    }
 63}
 64