bug#17636: Implement SCRAM-SHA-1 SASL mechanism

[Lars Ingebrigtsen]

Magnus Henoch <magnus.henoch@gmail.com> writes:

> rfc2104.el was rewritten for speed in 2008, and seems to be about
> twice as fast as hmac-*.el.  I think hmac-*.el could be deprecated and
> eventually removed; the only use in the Emacs tree is in sasl-cram.el.
>
> So here is a new and improved patch for implementing SCRAM-SHA-1, that
> uses the existing rfc2104.el instead of adding hmac-sha1.el.

Thanks; applied to the Emacs trunk.

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