Add TOTP (RFC6238) one-time password support

[John Morrissey]

On Thu, Mar 21, 2013 at 01:09:52PM +0000, David Woodhouse wrote:
> On Mon, 2013-03-18 at 23:53 -0400, John Morrissey wrote:
> > @@ -86,7 +87,7 @@
> >  #define OC_FORM_OPT_PASSWORD   2
> >  #define OC_FORM_OPT_SELECT     3
> >  #define OC_FORM_OPT_HIDDEN     4
> > -#define OC_FORM_OPT_STOKEN     5
> > +#define OC_FORM_OPT_TOKEN      5
> 
> Strictly speaking, that's an ABI change worthy of an soname bump. It's
> worse than that, in fact, because it's an *API* change too, and existing
> code wouldn't even rebuild correctly.
> 
> However, I don't think there *is* any existing code which uses
> OC_FORM_OPT_STOKEN. Kevin allegedly has NetworkManager patches, but
> that's it. Fabian, I don't think you've done anything with stoken yet,
> have you?
> 
> So I'm inclined to be naughty and just accept this...

Or #define OC_FORM_OPT_STOKEN 5 as well and mention that it's deprecated,
as a hedge.

john
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