name : Base64DotSlash.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 Base64DotSlash * ./[A-Z][a-z][0-9] * * @package ParagonIE\ConstantTime */ abstract class Base64DotSlash 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] * 0x2e-0x2f, 0x41-0x5a, 0x61-0x7a, 0x30-0x39 * * @param int $src * @return int */ protected static function decode6Bits(int $src): int { $ret = -1; // if ($src > 0x2d && $src < 0x30) ret += $src - 0x2e + 1; // -45 $ret += (((0x2d - $src) & ($src - 0x30)) >> 8) & ($src - 45); // if ($src > 0x40 && $src < 0x5b) ret += $src - 0x41 + 2 + 1; // -62 $ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 62); // if ($src > 0x60 && $src < 0x7b) ret += $src - 0x61 + 28 + 1; // -68 $ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 68); // if ($src > 0x2f && $src < 0x3a) ret += $src - 0x30 + 54 + 1; // 7 $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src + 7); 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 { $src += 0x2e; // if ($src > 0x2f) $src += 0x41 - 0x30; // 17 $src += ((0x2f - $src) >> 8) & 17; // if ($src > 0x5a) $src += 0x61 - 0x5b; // 6 $src += ((0x5a - $src) >> 8) & 6; // if ($src > 0x7a) $src += 0x30 - 0x7b; // -75 $src -= ((0x7a - $src) >> 8) & 75; return \pack('C', $src); } }