| 1 | <?php |
| 2 | /* |
| 3 | +--------------------------------------------------------------------+ |
| 4 | | CiviCRM version 4.7 | |
| 5 | +--------------------------------------------------------------------+ |
| 6 | | Copyright CiviCRM LLC (c) 2004-2015 | |
| 7 | +--------------------------------------------------------------------+ |
| 8 | | This file is a part of CiviCRM. | |
| 9 | | | |
| 10 | | CiviCRM is free software; you can copy, modify, and distribute it | |
| 11 | | under the terms of the GNU Affero General Public License | |
| 12 | | Version 3, 19 November 2007 and the CiviCRM Licensing Exception. | |
| 13 | | | |
| 14 | | CiviCRM is distributed in the hope that it will be useful, but | |
| 15 | | WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 | | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
| 17 | | See the GNU Affero General Public License for more details. | |
| 18 | | | |
| 19 | | You should have received a copy of the GNU Affero General Public | |
| 20 | | License and the CiviCRM Licensing Exception along | |
| 21 | | with this program; if not, contact CiviCRM LLC | |
| 22 | | at info[AT]civicrm[DOT]org. If you have questions about the | |
| 23 | | GNU Affero General Public License or the licensing of CiviCRM, | |
| 24 | | see the CiviCRM license FAQ at http://civicrm.org/licensing | |
| 25 | +--------------------------------------------------------------------+ |
| 26 | */ |
| 27 | |
| 28 | /** |
| 29 | * |
| 30 | * @package CRM |
| 31 | * @copyright CiviCRM LLC (c) 2004-2015 |
| 32 | */ |
| 33 | class CRM_Utils_Crypt { |
| 34 | |
| 35 | /** |
| 36 | * Encrypts a string using AES256 in ECB mode, if encryption is enabled. |
| 37 | * |
| 38 | * After encrypting the string, it is base64 encoded. |
| 39 | * |
| 40 | * If encryption is not enabled, either due to CIVICRM_SITE_KEY being |
| 41 | * undefined or due to unavailability of the mcrypt module, the string is |
| 42 | * merely base64 encoded and is not encrypted at all. |
| 43 | * |
| 44 | * @param string $string |
| 45 | * Plaintext to be encrypted. |
| 46 | * @return string |
| 47 | * Base64-encoded ciphertext, or base64-encoded plaintext if encryption is |
| 48 | * disabled or unavailable. |
| 49 | */ |
| 50 | public static function encrypt($string) { |
| 51 | if (empty($string)) { |
| 52 | return $string; |
| 53 | } |
| 54 | |
| 55 | if (function_exists('mcrypt_module_open') && |
| 56 | defined('CIVICRM_SITE_KEY') |
| 57 | ) { |
| 58 | $td = mcrypt_module_open(MCRYPT_RIJNDAEL_256, '', MCRYPT_MODE_ECB, ''); |
| 59 | // ECB mode - iv not needed - CRM-8198 |
| 60 | $iv = '00000000000000000000000000000000'; |
| 61 | $ks = mcrypt_enc_get_key_size($td); |
| 62 | $key = substr(sha1(CIVICRM_SITE_KEY), 0, $ks); |
| 63 | |
| 64 | mcrypt_generic_init($td, $key, $iv); |
| 65 | $string = mcrypt_generic($td, $string); |
| 66 | mcrypt_generic_deinit($td); |
| 67 | mcrypt_module_close($td); |
| 68 | } |
| 69 | return base64_encode($string); |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * Decrypts ciphertext encrypted with AES256 in ECB mode, if possible. |
| 74 | * |
| 75 | * If the mcrypt module is not available or if CIVICRM_SITE_KEY is not set, |
| 76 | * the provided ciphertext is only base64-decoded, not decrypted. |
| 77 | * |
| 78 | * @param string $string |
| 79 | * Ciphertext to be decrypted. |
| 80 | * @return string |
| 81 | * Plaintext, or base64-decoded ciphertext if encryption is disabled or |
| 82 | * unavailable. |
| 83 | */ |
| 84 | public static function decrypt($string) { |
| 85 | if (empty($string)) { |
| 86 | return $string; |
| 87 | } |
| 88 | |
| 89 | $string = base64_decode($string); |
| 90 | if (empty($string)) { |
| 91 | return $string; |
| 92 | } |
| 93 | |
| 94 | if (function_exists('mcrypt_module_open') && |
| 95 | defined('CIVICRM_SITE_KEY') |
| 96 | ) { |
| 97 | $td = mcrypt_module_open(MCRYPT_RIJNDAEL_256, '', MCRYPT_MODE_ECB, ''); |
| 98 | // ECB mode - iv not needed - CRM-8198 |
| 99 | $iv = '00000000000000000000000000000000'; |
| 100 | $ks = mcrypt_enc_get_key_size($td); |
| 101 | $key = substr(sha1(CIVICRM_SITE_KEY), 0, $ks); |
| 102 | |
| 103 | mcrypt_generic_init($td, $key, $iv); |
| 104 | $string = rtrim(mdecrypt_generic($td, $string)); |
| 105 | mcrypt_generic_deinit($td); |
| 106 | mcrypt_module_close($td); |
| 107 | } |
| 108 | |
| 109 | return $string; |
| 110 | } |
| 111 | |
| 112 | } |