googleanalytics
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lib
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analytics-admin
/
vendor
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paragonie
/
constant_time_encoding
/
src
/
Base64DotSlash.php
googleanalytics
/
lib
/
analytics-admin
/
vendor
/
paragonie
/
constant_time_encoding
/
src
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Base32.php
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Base32Hex.php
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Base64.php
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Base64DotSlash.php
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Base64DotSlashOrdered.php
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Base64UrlSafe.php
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Binary.php
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EncoderInterface.php
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Encoding.php
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Hex.php
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RFC4648.php
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Base64DotSlash.php
89 lines
| 1 | <?php |
| 2 | declare(strict_types=1); |
| 3 | namespace ParagonIE\ConstantTime; |
| 4 | |
| 5 | /** |
| 6 | * Copyright (c) 2016 - 2022 Paragon Initiative Enterprises. |
| 7 | * Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com) |
| 8 | * |
| 9 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 10 | * of this software and associated documentation files (the "Software"), to deal |
| 11 | * in the Software without restriction, including without limitation the rights |
| 12 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 13 | * copies of the Software, and to permit persons to whom the Software is |
| 14 | * furnished to do so, subject to the following conditions: |
| 15 | * |
| 16 | * The above copyright notice and this permission notice shall be included in all |
| 17 | * copies or substantial portions of the Software. |
| 18 | * |
| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 20 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 22 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 23 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 24 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 25 | * SOFTWARE. |
| 26 | */ |
| 27 | |
| 28 | /** |
| 29 | * Class Base64DotSlash |
| 30 | * ./[A-Z][a-z][0-9] |
| 31 | * |
| 32 | * @package ParagonIE\ConstantTime |
| 33 | */ |
| 34 | abstract class Base64DotSlash extends Base64 |
| 35 | { |
| 36 | /** |
| 37 | * Uses bitwise operators instead of table-lookups to turn 6-bit integers |
| 38 | * into 8-bit integers. |
| 39 | * |
| 40 | * Base64 character set: |
| 41 | * ./ [A-Z] [a-z] [0-9] |
| 42 | * 0x2e-0x2f, 0x41-0x5a, 0x61-0x7a, 0x30-0x39 |
| 43 | * |
| 44 | * @param int $src |
| 45 | * @return int |
| 46 | */ |
| 47 | protected static function decode6Bits(int $src): int |
| 48 | { |
| 49 | $ret = -1; |
| 50 | |
| 51 | // if ($src > 0x2d && $src < 0x30) ret += $src - 0x2e + 1; // -45 |
| 52 | $ret += (((0x2d - $src) & ($src - 0x30)) >> 8) & ($src - 45); |
| 53 | |
| 54 | // if ($src > 0x40 && $src < 0x5b) ret += $src - 0x41 + 2 + 1; // -62 |
| 55 | $ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 62); |
| 56 | |
| 57 | // if ($src > 0x60 && $src < 0x7b) ret += $src - 0x61 + 28 + 1; // -68 |
| 58 | $ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 68); |
| 59 | |
| 60 | // if ($src > 0x2f && $src < 0x3a) ret += $src - 0x30 + 54 + 1; // 7 |
| 61 | $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src + 7); |
| 62 | |
| 63 | return $ret; |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * Uses bitwise operators instead of table-lookups to turn 8-bit integers |
| 68 | * into 6-bit integers. |
| 69 | * |
| 70 | * @param int $src |
| 71 | * @return string |
| 72 | */ |
| 73 | protected static function encode6Bits(int $src): string |
| 74 | { |
| 75 | $src += 0x2e; |
| 76 | |
| 77 | // if ($src > 0x2f) $src += 0x41 - 0x30; // 17 |
| 78 | $src += ((0x2f - $src) >> 8) & 17; |
| 79 | |
| 80 | // if ($src > 0x5a) $src += 0x61 - 0x5b; // 6 |
| 81 | $src += ((0x5a - $src) >> 8) & 6; |
| 82 | |
| 83 | // if ($src > 0x7a) $src += 0x30 - 0x7b; // -75 |
| 84 | $src -= ((0x7a - $src) >> 8) & 75; |
| 85 | |
| 86 | return \pack('C', $src); |
| 87 | } |
| 88 | } |
| 89 |