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<?php
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/**
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* @file
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* Provides functions for encryption/decryption.
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*/
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/**
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* Return a random salt of a given length for crypt-style passwords.
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*
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* @param int length
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* The requested length.
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*
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* @return string
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* A (fairly) random salt of the requested length.
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*/
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function ldap_servers_random_salt($length) {
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$possible = '0123456789' . 'abcdefghijklmnopqrstuvwxyz' . 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' . './';
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$salt = "";
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mt_srand((double) microtime() * 1000000);
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while (strlen($salt) < $length) {
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$salt .= substr($possible, (rand() % strlen($possible)), 1);
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}
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return $salt;
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}
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/**
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* Encryption options available.
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*
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* @return array
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* Options.
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*/
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function _ldap_servers_encrypt_types() {
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$options = [
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LDAP_SERVERS_ENC_TYPE_CLEARTEXT => 'Clear text',
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];
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if (extension_loaded('openssl')) {
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$options[LDAP_SERVERS_ENC_TYPE_OPENSSL] = 'OpenSSL';
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}
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return $options;
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}
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/**
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* Encrypt string.
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*
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* @param $input
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* Clear text.
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* @param null $encryption_enabled
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* OpenSSL or clear text.
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*
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* @return string
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* Plain or encrypted.
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*/
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function _ldap_servers_encrypt($input, $encryption_enabled = NULL) {
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if (!$encryption_enabled) {
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$encryption_enabled = variable_get('ldap_servers_encryption', LDAP_SERVERS_ENC_TYPE_CLEARTEXT);
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}
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if ($encryption_enabled == LDAP_SERVERS_ENC_TYPE_CLEARTEXT) {
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return $input;
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}
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$key = variable_get('ldap_servers_encrypt_key', drupal_get_hash_salt());
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$iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length(LDAP_SERVERS_CYPHER_MODE));
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$encrypted_data = openssl_encrypt($input, LDAP_SERVERS_CYPHER_MODE, $key, 0, $iv);
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return base64_encode($encrypted_data . '::' . $iv);
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}
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/**
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* Decrypt string.
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*
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* @param string $input
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* Clear text or encrypted text.
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* @param null $encryption_enabled
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* OpenSSL or clear text.
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*
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* @return string
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* Clear text.
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*/
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function _ldap_servers_decrypt($input, $encryption_enabled = NULL) {
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if (!$encryption_enabled) {
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$encryption_enabled = variable_get('ldap_servers_encryption', LDAP_SERVERS_ENC_TYPE_CLEARTEXT);
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}
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if ($encryption_enabled == LDAP_SERVERS_ENC_TYPE_CLEARTEXT) {
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return $input;
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}
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$key = variable_get('ldap_servers_encrypt_key', drupal_get_hash_salt());
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list($encrypted_data, $iv) = explode('::', base64_decode($input), 2);
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return openssl_decrypt($encrypted_data, LDAP_SERVERS_CYPHER_MODE, $key, 0, $iv);
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}
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