name : Base64UrlSafe.php <?php declare(strict_types=1); namespace ParagonIE\ConstantTime; /** * Copyright (c) 2016 - 2022 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. */ /** * Class Base64UrlSafe * [A-Z][a-z][0-9]\-_ * * @package ParagonIE\ConstantTime */ abstract class Base64UrlSafe extends Base64 { /** * Uses bitwise operators instead of table-lookups to turn 6-bit integers * into 8-bit integers. * * Base64 character set: * [A-Z] [a-z] [0-9] - _ * 0x41-0x5a, 0x61-0x7a, 0x30-0x39, 0x2d, 0x5f * * @param int $src * @return int */ protected static function decode6Bits(int $src): int { $ret = -1; // if ($src > 0x40 && $src < 0x5b) $ret += $src - 0x41 + 1; // -64 $ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 64); // if ($src > 0x60 && $src < 0x7b) $ret += $src - 0x61 + 26 + 1; // -70 $ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 70); // if ($src > 0x2f && $src < 0x3a) $ret += $src - 0x30 + 52 + 1; // 5 $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src + 5); // if ($src == 0x2c) $ret += 62 + 1; $ret += (((0x2c - $src) & ($src - 0x2e)) >> 8) & 63; // if ($src == 0x5f) ret += 63 + 1; $ret += (((0x5e - $src) & ($src - 0x60)) >> 8) & 64; return $ret; } /** * Uses bitwise operators instead of table-lookups to turn 8-bit integers * into 6-bit integers. * * @param int $src * @return string */ protected static function encode6Bits(int $src): string { $diff = 0x41; // if ($src > 25) $diff += 0x61 - 0x41 - 26; // 6 $diff += ((25 - $src) >> 8) & 6; // if ($src > 51) $diff += 0x30 - 0x61 - 26; // -75 $diff -= ((51 - $src) >> 8) & 75; // if ($src > 61) $diff += 0x2d - 0x30 - 10; // -13 $diff -= ((61 - $src) >> 8) & 13; // if ($src > 62) $diff += 0x5f - 0x2b - 1; // 3 $diff += ((62 - $src) >> 8) & 49; return \pack('C', $src + $diff); } }