bug#15057: 24.3.50; TLS error with reasonably high gnutls-min-prime-bits

[Lars Magne Ingebrigtsen <larsi@gnus.org>]

Tassilo Horn <tsdh@gnu.org> writes:

> When TLS support landed and Gnus used it, I frequently had messages like
> "the Diffie-Hellman prime has been lowered to XXX bits" for XXX being
> 256(?) or something like that.  Then I've set

The fix here is to make that warning go away.  But we're moving to a new
version of gnutls, so nobody has taken the time to twiddle with warning
from the old version of the gnutls library.

> Would it be possible to have a new variable
> `gnutls-preferred-prime-bits' which is tried first for every connection?
> If the server doesn't want to, you'd get a warning and the number of
> bits would be lowered, but never below `gnutls-min-prime-bits' which
> would still be the hard limit where you get an error.

gnutls will try to use as high a number of bits as the server supports,
I think?  So the variables are fine as they are -- they will give you
all the security that the server says that it can provide.

So the warning is kinda semi-bogus.  Or at least ... premature.

-- 
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