1*927933f5SAndreas Gohr<?php 2*927933f5SAndreas Gohrdeclare(strict_types=1); 3*927933f5SAndreas Gohrnamespace ParagonIE\ConstantTime; 4*927933f5SAndreas Gohr 5*927933f5SAndreas Gohr/** 6*927933f5SAndreas Gohr * Copyright (c) 2016 - 2022 Paragon Initiative Enterprises. 7*927933f5SAndreas Gohr * Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com) 8*927933f5SAndreas Gohr * 9*927933f5SAndreas Gohr * Permission is hereby granted, free of charge, to any person obtaining a copy 10*927933f5SAndreas Gohr * of this software and associated documentation files (the "Software"), to deal 11*927933f5SAndreas Gohr * in the Software without restriction, including without limitation the rights 12*927933f5SAndreas Gohr * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 13*927933f5SAndreas Gohr * copies of the Software, and to permit persons to whom the Software is 14*927933f5SAndreas Gohr * furnished to do so, subject to the following conditions: 15*927933f5SAndreas Gohr * 16*927933f5SAndreas Gohr * The above copyright notice and this permission notice shall be included in all 17*927933f5SAndreas Gohr * copies or substantial portions of the Software. 18*927933f5SAndreas Gohr * 19*927933f5SAndreas Gohr * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 20*927933f5SAndreas Gohr * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21*927933f5SAndreas Gohr * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 22*927933f5SAndreas Gohr * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 23*927933f5SAndreas Gohr * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 24*927933f5SAndreas Gohr * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 25*927933f5SAndreas Gohr * SOFTWARE. 26*927933f5SAndreas Gohr */ 27*927933f5SAndreas Gohr 28*927933f5SAndreas Gohr/** 29*927933f5SAndreas Gohr * Class Base64DotSlashOrdered 30*927933f5SAndreas Gohr * ./[0-9][A-Z][a-z] 31*927933f5SAndreas Gohr * 32*927933f5SAndreas Gohr * @package ParagonIE\ConstantTime 33*927933f5SAndreas Gohr */ 34*927933f5SAndreas Gohrabstract class Base64DotSlashOrdered extends Base64 35*927933f5SAndreas Gohr{ 36*927933f5SAndreas Gohr /** 37*927933f5SAndreas Gohr * Uses bitwise operators instead of table-lookups to turn 6-bit integers 38*927933f5SAndreas Gohr * into 8-bit integers. 39*927933f5SAndreas Gohr * 40*927933f5SAndreas Gohr * Base64 character set: 41*927933f5SAndreas Gohr * [.-9] [A-Z] [a-z] 42*927933f5SAndreas Gohr * 0x2e-0x39, 0x41-0x5a, 0x61-0x7a 43*927933f5SAndreas Gohr * 44*927933f5SAndreas Gohr * @param int $src 45*927933f5SAndreas Gohr * @return int 46*927933f5SAndreas Gohr */ 47*927933f5SAndreas Gohr protected static function decode6Bits(int $src): int 48*927933f5SAndreas Gohr { 49*927933f5SAndreas Gohr $ret = -1; 50*927933f5SAndreas Gohr 51*927933f5SAndreas Gohr // if ($src > 0x2d && $src < 0x3a) ret += $src - 0x2e + 1; // -45 52*927933f5SAndreas Gohr $ret += (((0x2d - $src) & ($src - 0x3a)) >> 8) & ($src - 45); 53*927933f5SAndreas Gohr 54*927933f5SAndreas Gohr // if ($src > 0x40 && $src < 0x5b) ret += $src - 0x41 + 12 + 1; // -52 55*927933f5SAndreas Gohr $ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 52); 56*927933f5SAndreas Gohr 57*927933f5SAndreas Gohr // if ($src > 0x60 && $src < 0x7b) ret += $src - 0x61 + 38 + 1; // -58 58*927933f5SAndreas Gohr $ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 58); 59*927933f5SAndreas Gohr 60*927933f5SAndreas Gohr return $ret; 61*927933f5SAndreas Gohr } 62*927933f5SAndreas Gohr 63*927933f5SAndreas Gohr /** 64*927933f5SAndreas Gohr * Uses bitwise operators instead of table-lookups to turn 8-bit integers 65*927933f5SAndreas Gohr * into 6-bit integers. 66*927933f5SAndreas Gohr * 67*927933f5SAndreas Gohr * @param int $src 68*927933f5SAndreas Gohr * @return string 69*927933f5SAndreas Gohr */ 70*927933f5SAndreas Gohr protected static function encode6Bits(int $src): string 71*927933f5SAndreas Gohr { 72*927933f5SAndreas Gohr $src += 0x2e; 73*927933f5SAndreas Gohr 74*927933f5SAndreas Gohr // if ($src > 0x39) $src += 0x41 - 0x3a; // 7 75*927933f5SAndreas Gohr $src += ((0x39 - $src) >> 8) & 7; 76*927933f5SAndreas Gohr 77*927933f5SAndreas Gohr // if ($src > 0x5a) $src += 0x61 - 0x5b; // 6 78*927933f5SAndreas Gohr $src += ((0x5a - $src) >> 8) & 6; 79*927933f5SAndreas Gohr 80*927933f5SAndreas Gohr return \pack('C', $src); 81*927933f5SAndreas Gohr } 82*927933f5SAndreas Gohr} 83