public static bool decode(string key, out string reason)
{
byte[] xin = clib.hex_to_byte(key);
int index1 = 0;
int mon = 0;
reason = "";
if (key.Length < 30)
{
reason = "tooshort: Keys are 30 char long";
return(false);
}
MyKey.regid = (int)xin[index1] + (int)xin[index1 + 1] * 256 + (int)xin[index1 + 2] * 65536;
int index2 = index1 + 3;
MyKey.regdate = (int)xin[index2] + (int)xin[index2 + 1] * 256;
int index3 = index2 + 2;
MyKey.host = (int)xin[index3] + (int)xin[index3 + 1] * 256;
int num1 = index3 + 2;
byte[] numArray1 = xin;
int index4 = num1;
int num2 = index4 + 1;
MyKey.prodid = (int)numArray1[index4];
byte[] numArray2 = xin;
int index5 = num2;
int num3 = index5 + 1;
MyKey.flags = (int)numArray2[index5];
byte[] numArray3 = xin;
int index6 = num3;
int index7 = index6 + 1;
MyKey.ulimit = MyKey.keylib_ulimit_decode((int)numArray3[index6]);
int num4 = MyKey.keylib_crc(xin, MyKey.PRE_CRC);
int num5 = (int)xin[index7] + (int)xin[index7 + 1] * 256;
int num6 = index7 + 2;
clib.imsg("crc {0} {1}", (object)num4, (object)num5);
MyKey.reg_day1 = (int)xin[12];
MyKey.reg_day2 = (int)xin[13];
MyKey.fromdate = MyKey.keylib_fromdate(MyKey.regdate, MyKey.reg_day1, MyKey.reg_day2, out mon);
if (MyKey.host != 0)
{
string host = MyKey.get_host();
if (MyKey.keylib_host(host) != MyKey.host && MyKey.keylib_host(MyKey.keylib_host_trim(host)) != MyKey.host)
{
reason = string.Format("Key for wrong host=({0}) ({1}) , try activate again", (object)host, (object)MyKey.keylib_host_trim(host));
return(false);
}
}
DateTime date = clib.unix_to_date(MyKey.fromdate);
MyKey.expdate = date.AddMonths(mon).to_unix_date();
if (mon == 0)
{
date = clib.unix_to_date(MyKey.fromdate);
MyKey.expdate = date.AddMonths(12).to_unix_date();
}
MyKey.istemp = true;
if (mon == 0)
{
MyKey.istemp = false;
}
clib.imsg("Fromdate is {0} {1} Expires {2}", (object)MyKey.fromdate, (object)clib.nice_unix_date(MyKey.fromdate), (object)clib.nice_unix_date(MyKey.expdate));
if (num4 == num5)
{
return(true);
}
reason = "bad crc";
return(false);
}
private static int keylib_host(string host)
{
host = host.ToLower();
return(host == "*" ? 0 : MyKey.keylib_crc(clib.string_to_byte(host), host.Length) & (int)ushort.MaxValue);
}