Date: Sat, 14 Jan 2012 15:36:33 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: Bit slice implementation of DES based hashes On Sat, Jan 14, 2012 at 03:14:41PM +0530, Piyush Mittal wrote: > I am getting some problem in key initialisation. You mean, when trying to run your code? How do you know the problem is not elsewhere? > Can you please explain me what you did in DES_bs_init() for key > initialisation It initializes 768 key bit pointers (48 per DES round) in accordance with the DES key schedule. These are set to point to K element arrays. Obviously, there are multiple pointers to every K element - that's how DES works, using the same key bits multiple times in different rounds. > and why we have taken array DES_LM_KP ? I don't recall the details, but I think it implements an equivalent of Samba's smbdes.c: str_to_key(). You may or may not need it depending on whether your desired DES key setup is LM'ish or not. For example, you should not need it for Oracle hashes, but you probably need it for NETLM. Notice how NETLM_fmt_plug.c's setup_des_key() is similar to str_to_key() that I mentioned above. Hopefully, you won't need to modify DES_bs_init() itself - you just need to pass 0 or 1 for the "int LM" argument as appropriate. Alexander
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