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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 827 | daniel-mar | 1 | <?php |
| 2 | declare(strict_types=1); |
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| 3 | namespace ParagonIE\ConstantTime; |
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| 4 | |||
| 5 | /** |
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| 874 | daniel-mar | 6 | * Copyright (c) 2016 - 2022 Paragon Initiative Enterprises. |
| 827 | daniel-mar | 7 | * Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com) |
| 8 | * |
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| 9 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
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| 10 | * of this software and associated documentation files (the "Software"), to deal |
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| 11 | * in the Software without restriction, including without limitation the rights |
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| 12 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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| 13 | * copies of the Software, and to permit persons to whom the Software is |
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| 14 | * furnished to do so, subject to the following conditions: |
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| 15 | * |
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| 16 | * The above copyright notice and this permission notice shall be included in all |
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| 17 | * copies or substantial portions of the Software. |
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| 18 | * |
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| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 20 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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| 22 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 23 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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| 24 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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| 25 | * SOFTWARE. |
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| 26 | */ |
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| 27 | |||
| 28 | /** |
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| 29 | * Class Base64DotSlash |
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| 30 | * ./[A-Z][a-z][0-9] |
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| 31 | * |
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| 32 | * @package ParagonIE\ConstantTime |
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| 33 | */ |
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| 34 | abstract class Base64DotSlash extends Base64 |
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| 35 | { |
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| 36 | /** |
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| 37 | * Uses bitwise operators instead of table-lookups to turn 6-bit integers |
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| 38 | * into 8-bit integers. |
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| 39 | * |
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| 40 | * Base64 character set: |
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| 41 | * ./ [A-Z] [a-z] [0-9] |
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| 42 | * 0x2e-0x2f, 0x41-0x5a, 0x61-0x7a, 0x30-0x39 |
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| 43 | * |
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| 44 | * @param int $src |
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| 45 | * @return int |
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| 46 | */ |
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| 47 | protected static function decode6Bits(int $src): int |
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| 48 | { |
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| 49 | $ret = -1; |
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| 50 | |||
| 51 | // if ($src > 0x2d && $src < 0x30) ret += $src - 0x2e + 1; // -45 |
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| 52 | $ret += (((0x2d - $src) & ($src - 0x30)) >> 8) & ($src - 45); |
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| 53 | |||
| 54 | // if ($src > 0x40 && $src < 0x5b) ret += $src - 0x41 + 2 + 1; // -62 |
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| 55 | $ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 62); |
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| 56 | |||
| 57 | // if ($src > 0x60 && $src < 0x7b) ret += $src - 0x61 + 28 + 1; // -68 |
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| 58 | $ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 68); |
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| 59 | |||
| 60 | // if ($src > 0x2f && $src < 0x3a) ret += $src - 0x30 + 54 + 1; // 7 |
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| 61 | $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src + 7); |
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| 62 | |||
| 63 | return $ret; |
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| 64 | } |
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| 65 | |||
| 66 | /** |
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| 67 | * Uses bitwise operators instead of table-lookups to turn 8-bit integers |
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| 68 | * into 6-bit integers. |
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| 69 | * |
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| 70 | * @param int $src |
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| 71 | * @return string |
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| 72 | */ |
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| 73 | protected static function encode6Bits(int $src): string |
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| 74 | { |
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| 75 | $src += 0x2e; |
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| 76 | |||
| 77 | // if ($src > 0x2f) $src += 0x41 - 0x30; // 17 |
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| 78 | $src += ((0x2f - $src) >> 8) & 17; |
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| 79 | |||
| 80 | // if ($src > 0x5a) $src += 0x61 - 0x5b; // 6 |
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| 81 | $src += ((0x5a - $src) >> 8) & 6; |
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| 82 | |||
| 83 | // if ($src > 0x7a) $src += 0x30 - 0x7b; // -75 |
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| 84 | $src -= ((0x7a - $src) >> 8) & 75; |
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| 85 | |||
| 86 | return \pack('C', $src); |
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| 87 | } |
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| 88 | } |