[keygenme] dihux's keygenme 2

[dihux]

My second keygenme.

See readme.txt for details.

best regards

dihux

dhx_keygenme_2.zip

[HVC]

Hi dihux.

Due to the nature of the "Product Key" i wont reveal any details on calculating it, as i will spoil the fun for others who want to try this crackme.

If anyone wants to try this crackme, i highly suggest to him/her not to see another person's solution or submission.

Yes, it was nice, and yes, it could have become harder (but yet solvable).

Thanks for the crackme.

Keygen.rar

Edited July 8, 2009 by HVC

[Loki]

EDIT: updated version. Thanks to the person who spotted that sometimes invalid keys were genned - school girl error calculating K relative to P rather than the required P-1.

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HVC suggested I try this one... I did and enjoyed it so thanks dude

Trying to learn some C rather than just ASM at the moment so double the interest (and frustration with VS Express!)

Enjoyed it a lot, thanks dihux.

Important C is below as I guess few others will try this now (apologies if its crap coding, as I said I'm learning). Might help someone trying to do some ElGamal I guess? I'd suggest learning from the masters though.

Individual product code parts were solved with some quick n easy php....

Greetz to those way better at this than me an who I'm still learning from.

wsprintf((char *)&szProduct_Code, "37911-DIHUX-62119-FUNNY-%5X", ((GetTickCount()^rand())&0xFFFFF));
	SetDlgItemText(hDlg, ID_EDIT_PRODUCT_NUMBER, szProduct_Code);	//initialise miracl system and variables
	miracl *mip = mirsys(256, 0);
	mip->IOBASE = 16;	bytes_to_big((int)strlen(szUserName), (char *)szUserName, big_M);	// const bignums g, p, x, y
	cinstr(big_G, "39DDDC2ECDDEB42918A6");
	cinstr(big_Prime, "CBEC5F1F97FB14C803CB");
	cinstr(big_X, "3C9790DF807600AF91D");	//serial1 = g ^ k % p
	powmer(big_G, 1, big_Prime, big_Ser1);	//serial2 = (M - (serial1 * x)) * k^-1 % (p-1)
	decr(big_Prime, 1, big_Prime);
	multiply(big_Ser1, big_X, big_X);
	subtract(big_M, big_X, big_X);
	power(big_X, 1, big_Prime, big_X);
	add(big_X, big_Prime, big_Ser2);	// show serial
	cotstr(big_Ser1, szRegistration_Code_a);
	cotstr(big_Ser2, szRegistration_Code_;
	wsprintf((char *)&szRegistration_Code, "%s-%s", szRegistration_Code_a, szRegistration_Code_;

Keygen.rar

Edited August 21, 2009 by Loki

[dihux]

Thanks guys. See you in my keygenme nr. 3 in some years =)