<?php
declare(strict_types=1);
namespace ParagonIE\MultiFactor\OTP;
use ParagonIE\HiddenString\HiddenString;
/**
* Interface OTPInterface
* @package ParagonIE\MultiFactor\OTP
*/
interface OTPInterface
{
/**
* Get the code we need
*
* @param string|HiddenString $sharedSecret The key to use for determining the TOTP
* @param int $counterValue Current time or HOTP counter
* @return string
* @throws \OutOfRangeException
*/
public function getCode(
$sharedSecret,
int $counterValue
): string;
public function getLength(): int;
}
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