CoD4 GUID calculation

[Ridgepig 0]

Hi,

 

Does anyone know how CoD4 calculates a player's GUID?

I'm aware that in Quake 3 the GUID simply gets calculated from the keycode.

However, if I do so in CoD4 it doesn't result in my GUID.

 

I hope someone can provide me with the answer.

[IJzzo 1,072]

In CoD4 1.0 to 1.7 it gets calculated from the cdkey as well. Method: MD5 over the 1st 16 lowercase characters. But MD5 uses a custom initialization vektor.

[Ridgepig 0]

Must be the initialisation vector then. Is it the same one as for Quake 3 (as seen here: http://aluigi.altervista.org/papers/q3_guid.h ) ?\

 

Edit: after some testing it doesn't appear to be the same initialization vector. Do you happen to have the one used for CoD4?

Edited May 21, 2016 by Ridgepig

[IJzzo 1,072]

    md5.buf[0] = 0x6F1CD602;
    md5.buf[1] = 0x226C74BE;
    md5.buf[2] = 0xB31C088D;
    md5.buf[3] = 0x555A9639;
    md5.bits[0] = 0;
    md5.bits[1] = 0;

    MD5Update(&md5 , buffer, 16);
    MD5Final(&md5, digest);

    sprintf(final, "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
            digest[0], digest[1], digest[2], digest[3], digest[4], digest[5], digest[6], digest[7],
            digest[8], digest[9], digest[10], digest[11], digest[12], digest[13], digest[14], digest[15]
    );

[Ridgepig 0]

As I mentioned on Steam: thank you a lot!