AutoNotify/common_static_functions.php at master · PHSERIS/AutoNotify · GitHub

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<?php

##
# © 2016 Partners HealthCare System, Inc. All Rights Reserved.
##
/**

	Supporting functions for enhanced autonotification plugin.

  Originally based on Autonotify plugin by Andy Martin.
  As of June 2016, it support multiple notification emails in addition to multiple
  triggers.  The new version offers the ability to upgrade existing autonitfy
  configurations on first use.

	It must be used in conjunction with a data entry trigger to function in real-time.
	The settings for each project are stored as an encoded variable (an) in the query
  string of the DET.
**/

	/**
	* This file contains some functions that were plucked out of the REDCap code from version 5.x.x
	* These functions were changed slightly in subsequent REDcap versions and as a result they have been extracted here for longevity
	*/

        // Function for decrypting
	/**
	 *
	 * @global type $salt
	 * @param type $encrypted_data
	 * @param type $custom_salt
	 * @return boolean
	 */
        function decrypt_static($encrypted_data, $custom_salt=null)
        {
                if (!mcrypt_loaded_static()) return false;
                // $salt from db connection file
                global $salt;
                // If $custom_salt is not provided, then use the installation-specific $salt value
                $this_salt = ($custom_salt === null) ? $salt : $custom_salt;

                // This loop is for REDCap 5.x support.
                $iloops = 0;
                while ( strlen ( $this_salt ) < 32 ) {
                        $this_salt = $this_salt."".$this_salt; // append the stal to itself until it's over 32
                        if ( $iloops == 10 ) break;
                        $iloops+=1;
                }
                // If salt is longer than 32 characters, then truncate it to prevent issues
                if (strlen($this_salt) > 32) $this_salt = substr($this_salt, 0, 32);
                // Define an encryption/decryption variable beforehand
                defined("MCRYPT_IV") or define("MCRYPT_IV", mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND));
                // Decrypt and return
                return rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $this_salt, base64_decode($encrypted_data), MCRYPT_MODE_ECB, MCRYPT_IV),"\0");
        }

        // Function for checking if mcrypt PHP extension is loaded
        function mcrypt_loaded_static($show_error=false) {
		    if ((extension_loaded('mcrypt') || (function_exists('dl') && dl(((PHP_SHLIB_SUFFIX === 'dll') ? 'php_' : '') . (null ? null : 'mcrypt') . '.' . PHP_SHLIB_SUFFIX))) != 1) {
                        if ($show_error) {
                                exit('<div class="red"><b>ERROR:</b><br>The "mcrypt" PHP extension is not loaded but is required for encryption/decryption.<br>
                                  Please install the PHP extension "mcrypt" on your server, reboot your server, and then reload this page.</div>');
                        } else {
                                return false;
                        }
                } else {
                        return true;
                }
        }

        // Function for encrypting
        function encrypt_static($data, $custom_salt=null)
        {
                if (!mcrypt_loaded_static()) return false;
                // $salt from db connection file
                global $salt;
                // If $custom_salt is not provided, then use the installation-specific $salt value
                $this_salt = ($custom_salt === null) ? $salt : $custom_salt;

                // This loop is for REDCap 5.x support.
                $iloops = 0;
                while ( strlen ( $this_salt ) < 32 ) {
                        $this_salt = $this_salt."".$this_salt; // append the salt to itself until it's over 32
                        if ( $iloops == 10 ) break; // don't be silly - have an exit strategy
                        $iloops+=1;
                }
                // If salt is longer than 32 characters, then truncate it to prevent issues
                if (strlen($this_salt) > 32) $this_salt = substr($this_salt, 0, 32);
                // Define an encryption/decryption variable beforehand
                defined("MCRYPT_IV") or define("MCRYPT_IV", mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND));
                // Encrypt and return
                return rtrim(base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $this_salt, $data, MCRYPT_MODE_ECB, MCRYPT_IV)),"\0");
        }
?>