function text_decrypt($s, $key = false)
{
global $blowfish;
if (strlen($s) == 0) {
return $s;
}
# Parse crypted data
$type = cw_get_crypt_type($s);
if ($type === false) {
$type = "N";
$crc32 = false;
} elseif (substr($s, 1, 1) == '-') {
$crc32 = true;
$s = substr($s, 2);
} else {
$crc32 = substr($s, 1, 8);
$s = substr($s, 9);
}
# Blowfish
if ($type == 'B' || $type == 'C') {
if ($key === false) {
$key = cw_get_crypt_key($type);
}
if (!$blowfish) {
cw_log_flag("log_decrypt_errors", "DECRYPT", "The Blowfish service object is missing", true);
return false;
} elseif (empty($key)) {
cw_log_flag("log_decrypt_errors", "DECRYPT", "The key for the selected type ('" . $type . "') of encryption is missing", true);
return false;
}
$result = trim(cw_bf_decrypt($s, $key));
} elseif ($type == 'N') {
# Non-encrypted
$result = $s;
}
# CRC32 check
if ($crc32 === true) {
# Inner CRC32
$crc32 = substr($result, -8);
$result = substr($result, 0, -8);
if (cw_crc32(md5($result)) != $crc32) {
$result = NULL;
}
} elseif ($crc32 !== false) {
# Outer CRC32
if (cw_crc32($result) != $crc32) {
$result = NULL;
}
}
return $result;
}
function cw_bf_asc($array, $key)
{
global $blowfish;
$len = count($array);
$return = "";
for ($i = 1; $i < $len; $i++) {
$return .= $blowfish->int2asc($array[$i]);
}
$return = cw_bf_decrypt($return, $key);
if (crc32($return) != (int) $array[0]) {
return false;
}
return $return;
}
