^^&&^^

Edit File: EncoderInterface.php

<?php
declare(strict_types=1);
namespace ParagonIE\ConstantTime;

/**
 *  Copyright (c) 2016 - 2018 Paragon Initiative Enterprises.
 *  Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com)
 *
 *  Permission is hereby granted, free of charge, to any person obtaining a copy
 *  of this software and associated documentation files (the "Software"), to deal
 *  in the Software without restriction, including without limitation the rights
 *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  copies of the Software, and to permit persons to whom the Software is
 *  furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included in all
 *  copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 *  SOFTWARE.
 */

/**
 * Interface EncoderInterface
 * @package ParagonIE\ConstantTime
 */
interface EncoderInterface
{
    /**
     * Convert a binary string into a hexadecimal string without cache-timing
     * leaks
     *
     * @param string $binString (raw binary)
     * @return string
     */
    public static function encode(string $binString): string;

/**
     * Convert a binary string into a hexadecimal string without cache-timing
     * leaks
     *
     * @param string $encodedString
     * @param bool $strictPadding Error on invalid padding
     * @return string (raw binary)
     */
    public static function decode(string $encodedString, bool $strictPadding = false): string;
}