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Date: Tue, 16 Jun 2015 17:26:48 -0700
From: Gregory Shapiro <gshapiro@gshapiro.net>
To: Shawn Webb <shawn.webb@hardenedbsd.org>
Cc: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: Re: svn commit: r284436 - head/contrib/sendmail/src
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> >   This commit chages that default to 1024 bits.  sendmail 8.15.2, when
> >   released well use a default of 2048 bits.
> 
> If upstream will be using 2048 bits, why not simply use that?

The upstream is going to do this with a precomputed 2048 bit DH parameter.  To keep this interim fix simple and not a performance degradation, I went with a run-time generated 1024 bit.  Sites which wish to use 2048 run time can override the default in their configuration.  Likewise, when 8.15.2 is imported, sites that prefer not to use a precomputed DH parameter can create their own by overriding the default to use a run-time or their own precomputed (but "unique") using a DH parameter file on the local file system.