1927933f5SAndreas Gohr<?php 2927933f5SAndreas Gohrdeclare(strict_types=1); 3927933f5SAndreas Gohrnamespace ParagonIE\ConstantTime; 4927933f5SAndreas Gohr 5*8e88a29bSAndreas Gohruse Override; 6*8e88a29bSAndreas Gohr 7927933f5SAndreas Gohr/** 8927933f5SAndreas Gohr * Copyright (c) 2016 - 2022 Paragon Initiative Enterprises. 9927933f5SAndreas Gohr * Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com) 10927933f5SAndreas Gohr * 11927933f5SAndreas Gohr * Permission is hereby granted, free of charge, to any person obtaining a copy 12927933f5SAndreas Gohr * of this software and associated documentation files (the "Software"), to deal 13927933f5SAndreas Gohr * in the Software without restriction, including without limitation the rights 14927933f5SAndreas Gohr * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 15927933f5SAndreas Gohr * copies of the Software, and to permit persons to whom the Software is 16927933f5SAndreas Gohr * furnished to do so, subject to the following conditions: 17927933f5SAndreas Gohr * 18927933f5SAndreas Gohr * The above copyright notice and this permission notice shall be included in all 19927933f5SAndreas Gohr * copies or substantial portions of the Software. 20927933f5SAndreas Gohr * 21927933f5SAndreas Gohr * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 22927933f5SAndreas Gohr * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 23927933f5SAndreas Gohr * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 24927933f5SAndreas Gohr * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 25927933f5SAndreas Gohr * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 26927933f5SAndreas Gohr * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 27927933f5SAndreas Gohr * SOFTWARE. 28927933f5SAndreas Gohr */ 29927933f5SAndreas Gohr 30927933f5SAndreas Gohr/** 31927933f5SAndreas Gohr * Class Base64DotSlash 32927933f5SAndreas Gohr * ./[A-Z][a-z][0-9] 33927933f5SAndreas Gohr * 34927933f5SAndreas Gohr * @package ParagonIE\ConstantTime 35927933f5SAndreas Gohr */ 36927933f5SAndreas Gohrabstract class Base64DotSlash extends Base64 37927933f5SAndreas Gohr{ 38927933f5SAndreas Gohr /** 39927933f5SAndreas Gohr * Uses bitwise operators instead of table-lookups to turn 6-bit integers 40927933f5SAndreas Gohr * into 8-bit integers. 41927933f5SAndreas Gohr * 42927933f5SAndreas Gohr * Base64 character set: 43927933f5SAndreas Gohr * ./ [A-Z] [a-z] [0-9] 44927933f5SAndreas Gohr * 0x2e-0x2f, 0x41-0x5a, 0x61-0x7a, 0x30-0x39 45927933f5SAndreas Gohr * 46927933f5SAndreas Gohr * @param int $src 47927933f5SAndreas Gohr * @return int 48927933f5SAndreas Gohr */ 49*8e88a29bSAndreas Gohr #[Override] 50927933f5SAndreas Gohr protected static function decode6Bits(int $src): int 51927933f5SAndreas Gohr { 52927933f5SAndreas Gohr $ret = -1; 53927933f5SAndreas Gohr 54927933f5SAndreas Gohr // if ($src > 0x2d && $src < 0x30) ret += $src - 0x2e + 1; // -45 55927933f5SAndreas Gohr $ret += (((0x2d - $src) & ($src - 0x30)) >> 8) & ($src - 45); 56927933f5SAndreas Gohr 57927933f5SAndreas Gohr // if ($src > 0x40 && $src < 0x5b) ret += $src - 0x41 + 2 + 1; // -62 58927933f5SAndreas Gohr $ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 62); 59927933f5SAndreas Gohr 60927933f5SAndreas Gohr // if ($src > 0x60 && $src < 0x7b) ret += $src - 0x61 + 28 + 1; // -68 61927933f5SAndreas Gohr $ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 68); 62927933f5SAndreas Gohr 63927933f5SAndreas Gohr // if ($src > 0x2f && $src < 0x3a) ret += $src - 0x30 + 54 + 1; // 7 64927933f5SAndreas Gohr $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src + 7); 65927933f5SAndreas Gohr 66927933f5SAndreas Gohr return $ret; 67927933f5SAndreas Gohr } 68927933f5SAndreas Gohr 69927933f5SAndreas Gohr /** 70927933f5SAndreas Gohr * Uses bitwise operators instead of table-lookups to turn 8-bit integers 71927933f5SAndreas Gohr * into 6-bit integers. 72927933f5SAndreas Gohr * 73927933f5SAndreas Gohr * @param int $src 74927933f5SAndreas Gohr * @return string 75927933f5SAndreas Gohr */ 76*8e88a29bSAndreas Gohr #[Override] 77927933f5SAndreas Gohr protected static function encode6Bits(int $src): string 78927933f5SAndreas Gohr { 79927933f5SAndreas Gohr $src += 0x2e; 80927933f5SAndreas Gohr 81927933f5SAndreas Gohr // if ($src > 0x2f) $src += 0x41 - 0x30; // 17 82927933f5SAndreas Gohr $src += ((0x2f - $src) >> 8) & 17; 83927933f5SAndreas Gohr 84927933f5SAndreas Gohr // if ($src > 0x5a) $src += 0x61 - 0x5b; // 6 85927933f5SAndreas Gohr $src += ((0x5a - $src) >> 8) & 6; 86927933f5SAndreas Gohr 87927933f5SAndreas Gohr // if ($src > 0x7a) $src += 0x30 - 0x7b; // -75 88927933f5SAndreas Gohr $src -= ((0x7a - $src) >> 8) & 75; 89927933f5SAndreas Gohr 90927933f5SAndreas Gohr return \pack('C', $src); 91927933f5SAndreas Gohr } 92927933f5SAndreas Gohr} 93