GnuTLS/NSS interop in Exim 4.80 RC

Nikos Mavrogiannopoulos nmav at
Mon May 21 11:41:14 CEST 2012

On Mon, May 21, 2012 at 1:17 AM, Phil Pennock
<help-gnutls-phil at> wrote:
> On 2012-05-20 at 16:24 +0200, Nikos Mavrogiannopoulos wrote:
>>  From what I can tell it is the client for some reason terminates the
>> connection. What is the output on the client? Do you have a tcpdump of
>> the issue? Have you tried alternative priority strings than normal
>> [0]?
>> [0].
> Janne Snabb has done better detective work than I and found that NSS has
> a hard-coded clamp on the number of DH bits used for ephemeral D-H and
> GnuTLS's return value from gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH,
> GNUTLS_SEC_PARAM_NORMAL) is over that limit.

That's very interesting. Our key sizes is according to recommendations
like ECRYPT [0]. What is the NSS limit? Did you report it to the NSS



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