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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 Base32Hex |
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| 30 | * [0-9][A-V] |
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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 Base32Hex extends Base32 |
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| 35 | { |
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| 36 | /** |
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| 37 | * Uses bitwise operators instead of table-lookups to turn 5-bit integers |
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| 38 | * into 8-bit integers. |
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| 39 | * |
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| 40 | * @param int $src |
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| 41 | * @return int |
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| 42 | */ |
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| 43 | protected static function decode5Bits(int $src): int |
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| 44 | { |
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| 45 | $ret = -1; |
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| 46 | |||
| 47 | // if ($src > 0x30 && $src < 0x3a) ret += $src - 0x2e + 1; // -47 |
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| 48 | $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src - 47); |
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| 49 | |||
| 50 | // if ($src > 0x60 && $src < 0x77) ret += $src - 0x61 + 10 + 1; // -86 |
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| 51 | $ret += (((0x60 - $src) & ($src - 0x77)) >> 8) & ($src - 86); |
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| 52 | |||
| 53 | return $ret; |
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| 54 | } |
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| 55 | |||
| 56 | /** |
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| 57 | * Uses bitwise operators instead of table-lookups to turn 5-bit integers |
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| 58 | * into 8-bit integers. |
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| 59 | * |
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| 60 | * @param int $src |
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| 61 | * @return int |
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| 62 | */ |
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| 63 | protected static function decode5BitsUpper(int $src): int |
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| 64 | { |
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| 65 | $ret = -1; |
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| 66 | |||
| 67 | // if ($src > 0x30 && $src < 0x3a) ret += $src - 0x2e + 1; // -47 |
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| 68 | $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src - 47); |
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| 69 | |||
| 70 | // if ($src > 0x40 && $src < 0x57) ret += $src - 0x41 + 10 + 1; // -54 |
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| 71 | $ret += (((0x40 - $src) & ($src - 0x57)) >> 8) & ($src - 54); |
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| 72 | |||
| 73 | return $ret; |
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| 74 | } |
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| 75 | |||
| 76 | /** |
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| 77 | * Uses bitwise operators instead of table-lookups to turn 8-bit integers |
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| 78 | * into 5-bit integers. |
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| 79 | * |
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| 80 | * @param int $src |
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| 81 | * @return string |
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| 82 | */ |
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| 83 | protected static function encode5Bits(int $src): string |
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| 84 | { |
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| 85 | $src += 0x30; |
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| 86 | |||
| 87 | // if ($src > 0x39) $src += 0x61 - 0x3a; // 39 |
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| 88 | $src += ((0x39 - $src) >> 8) & 39; |
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| 89 | |||
| 90 | return \pack('C', $src); |
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| 91 | } |
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| 92 | |||
| 93 | /** |
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| 94 | * Uses bitwise operators instead of table-lookups to turn 8-bit integers |
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| 95 | * into 5-bit integers. |
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| 96 | * |
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| 97 | * Uppercase variant. |
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| 98 | * |
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| 99 | * @param int $src |
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| 100 | * @return string |
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| 101 | */ |
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| 102 | protected static function encode5BitsUpper(int $src): string |
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| 103 | { |
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| 104 | $src += 0x30; |
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| 105 | |||
| 106 | // if ($src > 0x39) $src += 0x41 - 0x3a; // 7 |
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| 107 | $src += ((0x39 - $src) >> 8) & 7; |
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| 108 | |||
| 109 | return \pack('C', $src); |
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| 110 | } |
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| 111 | } |