/**
* XOR two-way encryption/decryption, with a base64 wrapper.
*
* @package optimizeMember\Utilities
* @since 3.5
*
* @param str $base64 A string of data to decrypt. Should still be base64 encoded.
* @param str $key Optional. Key used originally for encryption. Defaults to the one configured for optimizeMember. Short of that, defaults to: ``wp_salt()``.
* @return str Decrypted string.
*/
public static function xdecrypt($base64 = FALSE, $key = FALSE)
{
$base64 = is_string($base64) ? $base64 : "";
$e = strlen($base64) ? c_ws_plugin__optimizemember_utils_strings::base64_url_safe_decode($base64) : "";
/**/
if (strlen($e) && preg_match("/^~xe(?:\\:([a-zA-Z0-9]+))?\\|(.*?)\$/s", $e, $md5_e)) {
$key = c_ws_plugin__optimizemember_utils_encryption::key($key);
/**/
if (strlen($md5_e[2]) && (!$md5_e[1] || $md5_e[1] === md5($md5_e[2]))) {
/**/
for ($i = 1, $d = ""; $i <= strlen($md5_e[2]); $i++) {
$char = substr($md5_e[2], $i - 1, 1);
$keychar = substr($key, $i % strlen($key) - 1, 1);
$d .= chr(ord($char) - ord($keychar));
}
}
if (isset($d) && is_string($d) && strlen($d)) {
/**/
if (strlen($d = preg_replace("/^~xe\\|/", "", $d, 1, $xe)) && $xe) {
$d = $d;
} else {
/* Else we need to empty this out. */
$d = "";
}
}
/**/
return isset($d) && is_string($d) && strlen($d) ? $string = $d : "";
} else {
/* Otherwise we must fail here with an empty string value. */
return "";
}
}
/**
* Verifies an optimizeMember-generated signature; in a full URL, a partial URI, or in just a query string.
*
* @package optimizeMember\Utilities
* @since 111106
*
* @param str $url_uri_query A full URL, a partial URI, or just a query string. Must have an optimizeMember-generated signature to validate.
* @param bool $check_time Optional. Defaults to false. If true, optimizeMember will also check if the signature has expired, based on ``$exp_secs``.
* @param str|int $exp_secs Optional. Defaults to (int)10. If ``$check_time`` is true, optimizeMember will check if the signature has expired, based on ``$exp_secs``.
* @param str $sig_var Optional. The name of the optimizeMember-generated signature variable. Defaults to `_optimizemember_sig`.
* @return bool True if the optimizeMember-generated signature is OK, else false.
*/
public static function optimizemember_sig_ok($url_uri_query = FALSE, $check_time = FALSE, $exp_secs = FALSE, $sig_var = FALSE)
{
$url_uri_query = $query = c_ws_plugin__optimizemember_utils_strings::trim((string) $url_uri_query, false, "?&=");
if (preg_match("/^(?:[a-z]+\\:\\/\\/|\\/)/i", $url_uri_query)) {
$query = trim(c_ws_plugin__optimizemember_utils_urls::parse_url($url_uri_query, PHP_URL_QUERY), "?&=");
}
/**/
$check_time = $check_time ? true : false;
$exp_secs = is_numeric($exp_secs) ? (int) $exp_secs : 10;
$sig_var = $sig_var && is_string($sig_var) ? $sig_var : "_optimizemember_sig";
/**/
$key = c_ws_plugin__optimizemember_utils_encryption::key();
/**/
if (preg_match_all("/" . preg_quote($sig_var, "/") . "\\=([0-9]+)-([^&\$]+)/", $query, $sigs)) {
$query = c_ws_plugin__optimizemember_utils_urls::remove_optimizemember_sigs($query, $sig_var);
/**/
wp_parse_str($query, $vars);
$vars = c_ws_plugin__optimizemember_utils_arrays::remove_0b_strings(c_ws_plugin__optimizemember_utils_strings::trim_deep($vars));
$vars = serialize(c_ws_plugin__optimizemember_utils_arrays::ksort_deep($vars));
/**/
($time = $sigs[1][$i = count($sigs[1]) - 1]) . ($sig = $sigs[2][$i]) . ($valid_sig = md5($key . $time . $vars));
/**/
if ($check_time) {
return $sig === $valid_sig && $time >= strtotime("-" . $exp_secs . " seconds");
} else {
/* Ignoring time? Just need to compare signatures in this case. */
return $sig === $valid_sig;
}
} else {
/* Return false. No ``$query``, or no ``$sigs``. */
return false;
}
}
