ParagonIE\Halite\Symmetric\Crypto::authenticate PHP Method

    public static function authenticate(string $message, AuthenticationKey $secretKey, $encoding = Halite::ENCODE_BASE64URLSAFE) : string
    {
        $config = SymmetricConfig::getConfig(Halite::HALITE_VERSION, 'auth');
        $mac = self::calculateMAC($message, $secretKey->getRawKeyMaterial(), $config);
        $encoder = Halite::chooseEncoder($encoding);
        if ($encoder) {
            return $encoder($mac);
        }
        return $mac;
    }

 /**
  * @covers Symmetric::authenticate()
  * @covers Symmetric::verify()
  */
 public function testAuthenticateFail()
 {
     $key = new AuthenticationKey(new HiddenString(\str_repeat('A', 32), true));
     $message = 'test message';
     $mac = Symmetric::authenticate($message, $key, true);
     // Test invalid message
     $this->assertFalse(Symmetric::verify('othermessage', $key, $mac, true));
     $r = \Sodium\randombytes_uniform(\mb_strlen($mac, '8bit'));
     $_mac = $mac;
     $_mac[$r] = \chr(\ord($_mac[$r]) ^ 1 << \Sodium\randombytes_uniform(8));
     // Test invalid signature
     $this->assertFalse(Symmetric::verify($message, $key, $_mac, true));
 }