-
-// ********** helper functions **********
-
-function checkPasswordConstraints($new_password, $user_email) {
- $errors = array();
- if ($new_password != trim($new_password)) {
- $errors[] = _('Password must not start or end with a whitespace character like a space.');
- }
- if (strlen($new_password) < 8) { $errors[] = sprintf(_('Password too short (min. %s characters).'), 8); }
- if (strlen($new_password) > 70) { $errors[] = sprintf(_('Password too long (max. %s characters).'), 70); }
- if ((strtolower($new_password) == strtolower($user_email)) ||
- in_array(strtolower($new_password), preg_split("/[@\.]+/", strtolower($user_email)))) {
- $errors[] = _('The passwort can not be equal to your email or any part of it.');
- }
- if ((strlen($new_password) < 15) && (preg_match('/^[a-zA-Z]+$/', $new_password))) {
- $errors[] = sprintf(_('Your password must use characters other than normal letters or contain least %s characters.'), 15);
- }
- if (preg_match('/^\d+$/', $new_password)) {
- $errors[] = sprintf(_('Your password cannot consist only of numbers.'), 15);
- }
- if (strlen(count_chars($new_password, 3)) < 5) {
- $errors[] = sprintf(_('Password does have to contain at least %s different characters.'), 5);
- }
- return $errors;
-}
-
-function createSessionKey() {
- return bin2hex(openssl_random_pseudo_bytes(512 / 8)); // Get 512 bits of randomness (128 byte hex string).
-}
-
-function createVerificationCode() {
- return bin2hex(openssl_random_pseudo_bytes(512 / 8)); // Get 512 bits of randomness (128 byte hex string).
-}
-
-function createTimeCode($session, $offset = null, $validity_minutes = 10) {
- // Matches TOTP algorithms, see https://en.wikipedia.org/wiki/Time-based_One-time_Password_Algorithm
- $valid_seconds = intval($validity_minutes) * 60;
- if ($valid_seconds < 60) { $valid_seconds = 60; }
- $code_digits = 8;
- $time = time();
- $rest = is_null($offset)?($time % $valid_seconds):intval($offset); // T0, will be sent as part of code to make it valid for the full duration.
- $counter = floor(($time - $rest) / $valid_seconds);
- $hmac = mhash(MHASH_SHA1, $counter, $session['id'].$session['sesskey']);
- $offset = hexdec(substr(bin2hex(substr($hmac, -1)), -1)); // Get the last 4 bits as a number.
- $totp = hexdec(bin2hex(substr($hmac, $offset, 4))) & 0x7FFFFFFF; // Take 4 bytes at the offset, discard highest bit.
- $totp_value = sprintf('%0'.$code_digits.'d', substr($totp, -$code_digits));
- return $rest.'.'.$totp_value;
-}
-
-function verifyTimeCode($timecode_to_verify, $session, $validity_minutes = 10) {
- if (preg_match('/^(\d+)\.\d+$/', $timecode_to_verify, $regs)) {
- return ($timecode_to_verify === createTimeCode($session, $regs[1], $validity_minutes));
- }
- return false;
-}
-