protected function TfaBasicSms::generate in TFA Basic plugins 7

Generate a random string of characters of length $this->codeLength.

Return value

string Generated random string of characters.

Overrides TfaBasePlugin::generate

3 calls to TfaBasicSms::generate()

TfaBasicSms::begin in includes/tfa_sms.inc

TFA process begin.

TfaBasicSms::submitForm in includes/tfa_sms.inc

Submit form.

TfaBasicSmsSetup::begin in includes/tfa_sms.inc

TFA process begin.

File

includes/tfa_sms.inc, line 109

Class

TfaBasicSms

Code

protected function generate() {
  $allowable_characters = '0123456789';

  // Zero-based count of characters in the allowable list:
  $len = strlen($allowable_characters) - 1;

  // Declare the password as a blank string.
  $string = '';

  // Loop the number of times specified by codeLength.
  for ($i = 0; $i < $this->codeLength; $i++) {
    do {

      // Find a secure random number within the range needed.
      $index = ord(drupal_random_bytes(1));
    } while ($index > $len);

    // Each iteration, pick a random character from the
    // allowable string and append it to the password:
    $string .= $allowable_characters[$index];
  }
  return $string;
}