/**
* @fn generate_key($username, $registration_date, $expiration_date, $license_type)
* @short Singular license generator
*/
public static function generate_key($username, $registration_date = NULL, $expiration_date = NULL, $license_type = SingularLicense::SINGLE_USER_LICENSE)
{
$key = NULL;
// Convert from ISO-8859-1 to UTF-8
$username = iconv("iso-8859-1", "utf-8", $username);
// Calculate SHA-1 hash
$hash = sha1($username);
// License start date
if (empty($registration_date)) {
$registration_date = date("Y-m-d");
}
// License expiration date
if (empty($expiration_date)) {
$expiration_date = date("Y-m-d", time() + SingularLicense::DEFAULT_LICENSE_DURATION);
}
// Digest to cypher
$digest = "{$hash};{$registration_date};{$expiration_date};{$license_type}";
$priv_key_path = dirname(__FILE__) . "/../openssl/singular_private_key.pem";
if (file_exists($priv_key_path)) {
$fp = fopen($priv_key_path, "r");
$priv_key = fread($fp, filesize($priv_key_path));
fclose($fp);
// $passphrase is required if your key is encoded (suggested)
$passphrase = '';
if (($res = openssl_get_privatekey($priv_key, $passphrase)) !== FALSE) {
/*
* NOTE: Here you use the returned resource value
*/
openssl_private_encrypt($digest, $crypttext, $res);
// Calculate the key
$key = Base64::encode_linelength($crypttext, 32);
}
}
return $key;
}
