2 namespace ParagonIE\ConstantTime;
5 * Copyright (c) 2016 Paragon Initiative Enterprises.
6 * Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com)
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included in all
16 * copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * @package ParagonIE\ConstantTime
33 abstract class Base32Hex extends Base32
36 * Uses bitwise operators instead of table-lookups to turn 5-bit integers
37 * into 8-bit integers.
42 protected static function decode5Bits($src)
46 // if ($src > 0x30 && $src < 0x3a) ret += $src - 0x2e + 1; // -47
47 $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src - 47);
49 // if ($src > 0x60 && $src < 0x77) ret += $src - 0x61 + 10 + 1; // -86
50 $ret += (((0x60 - $src) & ($src - 0x77)) >> 8) & ($src - 86);
56 * Uses bitwise operators instead of table-lookups to turn 5-bit integers
57 * into 8-bit integers.
62 protected static function decode5BitsUpper($src)
66 // if ($src > 0x30 && $src < 0x3a) ret += $src - 0x2e + 1; // -47
67 $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src - 47);
69 // if ($src > 0x40 && $src < 0x57) ret += $src - 0x41 + 10 + 1; // -54
70 $ret += (((0x40 - $src) & ($src - 0x57)) >> 8) & ($src - 54);
76 * Uses bitwise operators instead of table-lookups to turn 8-bit integers
77 * into 5-bit integers.
82 protected static function encode5Bits($src)
86 // if ($src > 0x39) $src += 0x61 - 0x3a; // 39
87 $src += ((0x39 - $src) >> 8) & 39;
89 return \pack('C', $src);
93 * Uses bitwise operators instead of table-lookups to turn 8-bit integers
94 * into 5-bit integers.
101 protected static function encode5BitsUpper($src)
105 // if ($src > 0x39) $src += 0x41 - 0x3a; // 7
106 $src += ((0x39 - $src) >> 8) & 7;
108 return \pack('C', $src);