2 /** |
2 /** |
3 * Random_* Compatibility Library |
3 * Random_* Compatibility Library |
4 * for using the new PHP 7 random_* API in PHP 5 projects |
4 * for using the new PHP 7 random_* API in PHP 5 projects |
5 * |
5 * |
6 * The MIT License (MIT) |
6 * The MIT License (MIT) |
7 * |
7 * |
8 * Copyright (c) 2015 Paragon Initiative Enterprises |
8 * Copyright (c) 2015 - 2017 Paragon Initiative Enterprises |
9 * |
9 * |
10 * Permission is hereby granted, free of charge, to any person obtaining a copy |
10 * Permission is hereby granted, free of charge, to any person obtaining a copy |
11 * of this software and associated documentation files (the "Software"), to deal |
11 * of this software and associated documentation files (the "Software"), to deal |
12 * in the Software without restriction, including without limitation the rights |
12 * in the Software without restriction, including without limitation the rights |
13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
26 * SOFTWARE. |
26 * SOFTWARE. |
27 */ |
27 */ |
28 |
28 |
29 if ( ! is_callable( 'random_bytes' ) ): |
29 if (!is_callable('random_bytes')) { |
30 /** |
30 /** |
31 * If the libsodium PHP extension is loaded, we'll use it above any other |
31 * If the libsodium PHP extension is loaded, we'll use it above any other |
32 * solution. |
32 * solution. |
33 * |
33 * |
34 * libsodium-php project: |
34 * libsodium-php project: |
35 * @ref https://github.com/jedisct1/libsodium-php |
35 * @ref https://github.com/jedisct1/libsodium-php |
36 * |
36 * |
37 * @param int $bytes |
37 * @param int $bytes |
38 * |
38 * |
39 * @throws Exception |
39 * @throws Exception |
40 * |
40 * |
41 * @return string |
41 * @return string |
42 */ |
42 */ |
43 function random_bytes($bytes) |
43 function random_bytes($bytes) |
44 { |
44 { |
45 try { |
45 try { |
46 $bytes = RandomCompat_intval($bytes); |
46 $bytes = RandomCompat_intval($bytes); |
47 } catch (TypeError $ex) { |
47 } catch (TypeError $ex) { |
48 throw new TypeError( |
48 throw new TypeError( |
49 'random_bytes(): $bytes must be an integer' |
49 'random_bytes(): $bytes must be an integer' |
|
50 ); |
|
51 } |
|
52 |
|
53 if ($bytes < 1) { |
|
54 throw new Error( |
|
55 'Length must be greater than 0' |
|
56 ); |
|
57 } |
|
58 |
|
59 /** |
|
60 * \Sodium\randombytes_buf() doesn't allow more than 2147483647 bytes to be |
|
61 * generated in one invocation. |
|
62 */ |
|
63 if ($bytes > 2147483647) { |
|
64 $buf = ''; |
|
65 for ($i = 0; $i < $bytes; $i += 1073741824) { |
|
66 $n = ($bytes - $i) > 1073741824 |
|
67 ? 1073741824 |
|
68 : $bytes - $i; |
|
69 $buf .= \Sodium\randombytes_buf($n); |
|
70 } |
|
71 } else { |
|
72 $buf = \Sodium\randombytes_buf($bytes); |
|
73 } |
|
74 |
|
75 if ($buf !== false) { |
|
76 if (RandomCompat_strlen($buf) === $bytes) { |
|
77 return $buf; |
|
78 } |
|
79 } |
|
80 |
|
81 /** |
|
82 * If we reach here, PHP has failed us. |
|
83 */ |
|
84 throw new Exception( |
|
85 'Could not gather sufficient random data' |
50 ); |
86 ); |
51 } |
87 } |
52 |
|
53 if ($bytes < 1) { |
|
54 throw new Error( |
|
55 'Length must be greater than 0' |
|
56 ); |
|
57 } |
|
58 |
|
59 /** |
|
60 * \Sodium\randombytes_buf() doesn't allow more than 2147483647 bytes to be |
|
61 * generated in one invocation. |
|
62 */ |
|
63 if ($bytes > 2147483647) { |
|
64 $buf = ''; |
|
65 for ($i = 0; $i < $bytes; $i += 1073741824) { |
|
66 $n = ($bytes - $i) > 1073741824 |
|
67 ? 1073741824 |
|
68 : $bytes - $i; |
|
69 $buf .= \Sodium\randombytes_buf($n); |
|
70 } |
|
71 } else { |
|
72 $buf = \Sodium\randombytes_buf($bytes); |
|
73 } |
|
74 |
|
75 if ($buf !== false) { |
|
76 if (RandomCompat_strlen($buf) === $bytes) { |
|
77 return $buf; |
|
78 } |
|
79 } |
|
80 |
|
81 /** |
|
82 * If we reach here, PHP has failed us. |
|
83 */ |
|
84 throw new Exception( |
|
85 'Could not gather sufficient random data' |
|
86 ); |
|
87 } |
88 } |
88 endif; |
|