In message <3028.1022196192@itojun.org>, itojun@iijlab.net writes:
>>My suggested algorithm is this:
>>
>>	s = salt;	/* or s = hmac_sha512(site-specific-string, salt); */
>>	for (i = 0; i < num_iterations; i++)
>>		s = hmac_sha512(password, s);
>
>	hmm.  i see.  we should implement $2$ as openbsd does (there's no need
>	to be different), and the above algorithm can become $3$.
>
Sounds good.  It will take a bit of experimenting to decide what the 
right default value is for num_iterations.  It would be nice if there 
were a way to parameterize it in /etc/passwd.conf.

		--Steve Bellovin, http://www.research.att.com/~smb (me)
		http://www.wilyhacker.com ("Firewalls" book)