2 declare(strict_types=1);
3 namespace ParagonIE\ConstantTime;
6 * Copyright (c) 2016 Paragon Initiative Enterprises.
7 * Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com)
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:
16 * The above copyright notice and this permission notice shall be included in all
17 * copies or substantial portions of the Software.
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
32 * @package ParagonIE\ConstantTime
34 abstract class Base32Hex extends Base32
37 * Uses bitwise operators instead of table-lookups to turn 5-bit integers
38 * into 8-bit integers.
43 protected static function decode5Bits(int $src): int
47 // if ($src > 0x30 && $src < 0x3a) ret += $src - 0x2e + 1; // -47
48 $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src - 47);
50 // if ($src > 0x60 && $src < 0x77) ret += $src - 0x61 + 10 + 1; // -86
51 $ret += (((0x60 - $src) & ($src - 0x77)) >> 8) & ($src - 86);
57 * Uses bitwise operators instead of table-lookups to turn 5-bit integers
58 * into 8-bit integers.
63 protected static function decode5BitsUpper(int $src): int
67 // if ($src > 0x30 && $src < 0x3a) ret += $src - 0x2e + 1; // -47
68 $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src - 47);
70 // if ($src > 0x40 && $src < 0x57) ret += $src - 0x41 + 10 + 1; // -54
71 $ret += (((0x40 - $src) & ($src - 0x57)) >> 8) & ($src - 54);
77 * Uses bitwise operators instead of table-lookups to turn 8-bit integers
78 * into 5-bit integers.
83 protected static function encode5Bits(int $src): string
87 // if ($src > 0x39) $src += 0x61 - 0x3a; // 39
88 $src += ((0x39 - $src) >> 8) & 39;
90 return \pack('C', $src);
94 * Uses bitwise operators instead of table-lookups to turn 8-bit integers
95 * into 5-bit integers.
102 protected static function encode5BitsUpper(int $src): string
106 // if ($src > 0x39) $src += 0x41 - 0x3a; // 7
107 $src += ((0x39 - $src) >> 8) & 7;
109 return \pack('C', $src);