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1 | <?php |
2 | /* | |
3 | +--------------------------------------------------------------------+ | |
bc77d7c0 | 4 | | Copyright CiviCRM LLC. All rights reserved. | |
6a488035 | 5 | | | |
bc77d7c0 TO |
6 | | This work is published under the GNU AGPLv3 license with some | |
7 | | permitted exceptions and without any warranty. For full license | | |
8 | | and copyright information, see https://civicrm.org/licensing | | |
6a488035 | 9 | +--------------------------------------------------------------------+ |
d25dd0ee | 10 | */ |
6a488035 TO |
11 | |
12 | /** | |
13 | * | |
14 | * @package CRM | |
ca5cec67 | 15 | * @copyright CiviCRM LLC https://civicrm.org/licensing |
6a488035 TO |
16 | */ |
17 | class CRM_Utils_Crypt { | |
18 | ||
d65b5830 RS |
19 | /** |
20 | * Encrypts a string using AES256 in ECB mode, if encryption is enabled. | |
21 | * | |
22 | * After encrypting the string, it is base64 encoded. | |
23 | * | |
24 | * If encryption is not enabled, either due to CIVICRM_SITE_KEY being | |
25 | * undefined or due to unavailability of the mcrypt module, the string is | |
26 | * merely base64 encoded and is not encrypted at all. | |
27 | * | |
28 | * @param string $string | |
29 | * Plaintext to be encrypted. | |
30 | * @return string | |
31 | * Base64-encoded ciphertext, or base64-encoded plaintext if encryption is | |
32 | * disabled or unavailable. | |
33 | */ | |
00be9182 | 34 | public static function encrypt($string) { |
6a488035 TO |
35 | if (empty($string)) { |
36 | return $string; | |
37 | } | |
38 | ||
39 | if (function_exists('mcrypt_module_open') && | |
40 | defined('CIVICRM_SITE_KEY') | |
41 | ) { | |
db0e155c | 42 | // phpcs:disable |
6a488035 TO |
43 | $td = mcrypt_module_open(MCRYPT_RIJNDAEL_256, '', MCRYPT_MODE_ECB, ''); |
44 | // ECB mode - iv not needed - CRM-8198 | |
353ffa53 TO |
45 | $iv = '00000000000000000000000000000000'; |
46 | $ks = mcrypt_enc_get_key_size($td); | |
6a488035 TO |
47 | $key = substr(sha1(CIVICRM_SITE_KEY), 0, $ks); |
48 | ||
49 | mcrypt_generic_init($td, $key, $iv); | |
50 | $string = mcrypt_generic($td, $string); | |
51 | mcrypt_generic_deinit($td); | |
52 | mcrypt_module_close($td); | |
53 | } | |
db0e155c | 54 | // phpcs:enable |
6a488035 TO |
55 | return base64_encode($string); |
56 | } | |
57 | ||
d65b5830 RS |
58 | /** |
59 | * Decrypts ciphertext encrypted with AES256 in ECB mode, if possible. | |
60 | * | |
61 | * If the mcrypt module is not available or if CIVICRM_SITE_KEY is not set, | |
62 | * the provided ciphertext is only base64-decoded, not decrypted. | |
63 | * | |
64 | * @param string $string | |
65 | * Ciphertext to be decrypted. | |
66 | * @return string | |
67 | * Plaintext, or base64-decoded ciphertext if encryption is disabled or | |
68 | * unavailable. | |
69 | */ | |
00be9182 | 70 | public static function decrypt($string) { |
6a488035 TO |
71 | if (empty($string)) { |
72 | return $string; | |
73 | } | |
74 | ||
75 | $string = base64_decode($string); | |
76 | if (empty($string)) { | |
77 | return $string; | |
78 | } | |
79 | ||
80 | if (function_exists('mcrypt_module_open') && | |
81 | defined('CIVICRM_SITE_KEY') | |
82 | ) { | |
db0e155c | 83 | // phpcs:disable |
6a488035 TO |
84 | $td = mcrypt_module_open(MCRYPT_RIJNDAEL_256, '', MCRYPT_MODE_ECB, ''); |
85 | // ECB mode - iv not needed - CRM-8198 | |
353ffa53 TO |
86 | $iv = '00000000000000000000000000000000'; |
87 | $ks = mcrypt_enc_get_key_size($td); | |
6a488035 TO |
88 | $key = substr(sha1(CIVICRM_SITE_KEY), 0, $ks); |
89 | ||
90 | mcrypt_generic_init($td, $key, $iv); | |
91 | $string = rtrim(mdecrypt_generic($td, $string)); | |
92 | mcrypt_generic_deinit($td); | |
93 | mcrypt_module_close($td); | |
db0e155c | 94 | // phpcs:enable |
6a488035 TO |
95 | } |
96 | ||
97 | return $string; | |
98 | } | |
96025800 | 99 | |
6a488035 | 100 | } |