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Base32.php 3 years ago Base32Hex.php 3 years ago Base64.php 3 years ago Base64DotSlash.php 3 years ago Base64DotSlashOrdered.php 3 years ago Base64UrlSafe.php 3 years ago Binary.php 3 years ago EncoderInterface.php 3 years ago Encoding.php 3 years ago Hex.php 3 years ago RFC4648.php 3 years ago

Base32Hex.php

111 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 Base32Hex
30	* [0-9][A-V]
31	*
32	* @package ParagonIE\ConstantTime
33	*/
34	abstract class Base32Hex extends Base32
35	{
36	/**
37	* Uses bitwise operators instead of table-lookups to turn 5-bit integers
38	* into 8-bit integers.
39	*
40	* @param int $src
41	* @return int
42	*/
43	protected static function decode5Bits(int $src): int
44	{
45	$ret = -1;
46
47	// if ($src > 0x30 && $src < 0x3a) ret += $src - 0x2e + 1; // -47
48	$ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src - 47);
49
50	// if ($src > 0x60 && $src < 0x77) ret += $src - 0x61 + 10 + 1; // -86
51	$ret += (((0x60 - $src) & ($src - 0x77)) >> 8) & ($src - 86);
52
53	return $ret;
54	}
55
56	/**
57	* Uses bitwise operators instead of table-lookups to turn 5-bit integers
58	* into 8-bit integers.
59	*
60	* @param int $src
61	* @return int
62	*/
63	protected static function decode5BitsUpper(int $src): int
64	{
65	$ret = -1;
66
67	// if ($src > 0x30 && $src < 0x3a) ret += $src - 0x2e + 1; // -47
68	$ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src - 47);
69
70	// if ($src > 0x40 && $src < 0x57) ret += $src - 0x41 + 10 + 1; // -54
71	$ret += (((0x40 - $src) & ($src - 0x57)) >> 8) & ($src - 54);
72
73	return $ret;
74	}
75
76	/**
77	* Uses bitwise operators instead of table-lookups to turn 8-bit integers
78	* into 5-bit integers.
79	*
80	* @param int $src
81	* @return string
82	*/
83	protected static function encode5Bits(int $src): string
84	{
85	$src += 0x30;
86
87	// if ($src > 0x39) $src += 0x61 - 0x3a; // 39
88	$src += ((0x39 - $src) >> 8) & 39;
89
90	return \pack('C', $src);
91	}
92
93	/**
94	* Uses bitwise operators instead of table-lookups to turn 8-bit integers
95	* into 5-bit integers.
96	*
97	* Uppercase variant.
98	*
99	* @param int $src
100	* @return string
101	*/
102	protected static function encode5BitsUpper(int $src): string
103	{
104	$src += 0x30;
105
106	// if ($src > 0x39) $src += 0x41 - 0x3a; // 7
107	$src += ((0x39 - $src) >> 8) & 7;
108
109	return \pack('C', $src);
110	}
111	}