1<?php 2declare(strict_types=1); 3namespace ParagonIE\ConstantTime; 4 5use Override; 6 7/** 8 * Copyright (c) 2016 - 2022 Paragon Initiative Enterprises. 9 * Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com) 10 * 11 * Permission is hereby granted, free of charge, to any person obtaining a copy 12 * of this software and associated documentation files (the "Software"), to deal 13 * in the Software without restriction, including without limitation the rights 14 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 15 * copies of the Software, and to permit persons to whom the Software is 16 * furnished to do so, subject to the following conditions: 17 * 18 * The above copyright notice and this permission notice shall be included in all 19 * copies or substantial portions of the Software. 20 * 21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 24 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 26 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 27 * SOFTWARE. 28 */ 29 30/** 31 * Class Base64DotSlashOrdered 32 * ./[0-9][A-Z][a-z] 33 * 34 * @package ParagonIE\ConstantTime 35 */ 36abstract class Base64DotSlashOrdered extends Base64 37{ 38 /** 39 * Uses bitwise operators instead of table-lookups to turn 6-bit integers 40 * into 8-bit integers. 41 * 42 * Base64 character set: 43 * [.-9] [A-Z] [a-z] 44 * 0x2e-0x39, 0x41-0x5a, 0x61-0x7a 45 * 46 * @param int $src 47 * @return int 48 */ 49 #[Override] 50 protected static function decode6Bits(int $src): int 51 { 52 $ret = -1; 53 54 // if ($src > 0x2d && $src < 0x3a) ret += $src - 0x2e + 1; // -45 55 $ret += (((0x2d - $src) & ($src - 0x3a)) >> 8) & ($src - 45); 56 57 // if ($src > 0x40 && $src < 0x5b) ret += $src - 0x41 + 12 + 1; // -52 58 $ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 52); 59 60 // if ($src > 0x60 && $src < 0x7b) ret += $src - 0x61 + 38 + 1; // -58 61 $ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 58); 62 63 return $ret; 64 } 65 66 /** 67 * Uses bitwise operators instead of table-lookups to turn 8-bit integers 68 * into 6-bit integers. 69 * 70 * @param int $src 71 * @return string 72 */ 73 #[Override] 74 protected static function encode6Bits(int $src): string 75 { 76 $src += 0x2e; 77 78 // if ($src > 0x39) $src += 0x41 - 0x3a; // 7 79 $src += ((0x39 - $src) >> 8) & 7; 80 81 // if ($src > 0x5a) $src += 0x61 - 0x5b; // 6 82 $src += ((0x5a - $src) >> 8) & 6; 83 84 return \pack('C', $src); 85 } 86} 87