gg-keygen-gg32.h

Idź do dokumentacji tego pliku.

/* gg_login_hash() copied from libgadu copyrighted under LGPL-2.1 (C) libgadu developers */
/* cache created by me. */
static unsigned int gg_login_hash() {
    static unsigned int saved_y;
    static unsigned char *saved_pos;
    static unsigned char saved_zn;

    unsigned int y;
    unsigned char *password;

    if (saved_pos && *saved_pos == saved_zn) {
        y = saved_y;
        password = saved_pos + 1;
    } else {
        y = SEED;
        password = realpass;
    }

/* I have no idea, how to crack/optimize this algo. Maybe someone? */
    do {
        register unsigned char zn = *password;
        register unsigned char z;

        y ^= zn;
        y += zn;

        y ^= (zn << 8);
        y -= (zn << 16);
        y ^= (zn << 24);

        z = y & 0x1F;
        y = (y << z) | (y >> (32 - z));

        if (*(++password)) {
            y ^= (zn << 24);
            y += (zn << 24);

            if (password[1] == '\0') {
                saved_y = y;
                saved_zn = zn;
                saved_pos = &password[-1];
            }
        }
    } while (*password);

#if ULTRA_DEBUG
    printf("%s -> 0x%x\n", realpass, y);
#endif
    return y;
}