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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 Base64UrlSafe |
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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 Base64UrlSafe extends Base64 |
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| 35 | { |
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| 36 | |||
| 37 | /** |
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| 38 | * Uses bitwise operators instead of table-lookups to turn 6-bit integers |
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| 39 | * into 8-bit integers. |
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| 40 | * |
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| 41 | * Base64 character set: |
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| 42 | * [A-Z] [a-z] [0-9] - _ |
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| 43 | * 0x41-0x5a, 0x61-0x7a, 0x30-0x39, 0x2d, 0x5f |
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| 44 | * |
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| 45 | * @param int $src |
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| 46 | * @return int |
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| 47 | */ |
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| 48 | protected static function decode6Bits(int $src): int |
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| 49 | { |
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| 50 | $ret = -1; |
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| 51 | |||
| 52 | // if ($src > 0x40 && $src < 0x5b) $ret += $src - 0x41 + 1; // -64 |
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| 53 | $ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 64); |
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| 54 | |||
| 55 | // if ($src > 0x60 && $src < 0x7b) $ret += $src - 0x61 + 26 + 1; // -70 |
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| 56 | $ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 70); |
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| 57 | |||
| 58 | // if ($src > 0x2f && $src < 0x3a) $ret += $src - 0x30 + 52 + 1; // 5 |
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| 59 | $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src + 5); |
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| 60 | |||
| 61 | // if ($src == 0x2c) $ret += 62 + 1; |
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| 62 | $ret += (((0x2c - $src) & ($src - 0x2e)) >> 8) & 63; |
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| 63 | |||
| 64 | // if ($src == 0x5f) ret += 63 + 1; |
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| 65 | $ret += (((0x5e - $src) & ($src - 0x60)) >> 8) & 64; |
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| 66 | |||
| 67 | return $ret; |
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| 68 | } |
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| 69 | |||
| 70 | /** |
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| 71 | * Uses bitwise operators instead of table-lookups to turn 8-bit integers |
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| 72 | * into 6-bit integers. |
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| 73 | * |
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| 74 | * @param int $src |
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| 75 | * @return string |
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| 76 | */ |
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| 77 | protected static function encode6Bits(int $src): string |
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| 78 | { |
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| 79 | $diff = 0x41; |
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| 80 | |||
| 81 | // if ($src > 25) $diff += 0x61 - 0x41 - 26; // 6 |
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| 82 | $diff += ((25 - $src) >> 8) & 6; |
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| 83 | |||
| 84 | // if ($src > 51) $diff += 0x30 - 0x61 - 26; // -75 |
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| 85 | $diff -= ((51 - $src) >> 8) & 75; |
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| 86 | |||
| 87 | // if ($src > 61) $diff += 0x2d - 0x30 - 10; // -13 |
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| 88 | $diff -= ((61 - $src) >> 8) & 13; |
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| 89 | |||
| 90 | // if ($src > 62) $diff += 0x5f - 0x2b - 1; // 3 |
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| 91 | $diff += ((62 - $src) >> 8) & 49; |
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| 92 | |||
| 93 | return \pack('C', $src + $diff); |
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| 94 | } |
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| 95 | } |