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
28 * Class Base64DotSlash
31 * @package ParagonIE\ConstantTime
33 abstract class Base64DotSlash extends Base64
36 * Uses bitwise operators instead of table-lookups to turn 6-bit integers
37 * into 8-bit integers.
39 * Base64 character set:
40 * ./ [A-Z] [a-z] [0-9]
41 * 0x2e-0x2f, 0x41-0x5a, 0x61-0x7a, 0x30-0x39
46 protected static function decode6Bits($src)
50 // if ($src > 0x2d && $src < 0x30) ret += $src - 0x2e + 1; // -45
51 $ret += (((0x2d - $src) & ($src - 0x30)) >> 8) & ($src - 45);
53 // if ($src > 0x40 && $src < 0x5b) ret += $src - 0x41 + 2 + 1; // -62
54 $ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 62);
56 // if ($src > 0x60 && $src < 0x7b) ret += $src - 0x61 + 28 + 1; // -68
57 $ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 68);
59 // if ($src > 0x2f && $src < 0x3a) ret += $src - 0x30 + 54 + 1; // 7
60 $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src + 7);
66 * Uses bitwise operators instead of table-lookups to turn 8-bit integers
67 * into 6-bit integers.
72 protected static function encode6Bits($src)
76 // if ($src > 0x2f) $src += 0x41 - 0x30; // 17
77 $src += ((0x2f - $src) >> 8) & 17;
79 // if ($src > 0x5a) $src += 0x61 - 0x5b; // 6
80 $src += ((0x5a - $src) >> 8) & 6;
82 // if ($src > 0x7a) $src += 0x30 - 0x7b; // -75
83 $src -= ((0x7a - $src) >> 8) & 75;
85 return \pack('C', $src);