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Date: Wed, 25 Dec 2013 12:10:26 +0000
From: RW <rwmaillists@googlemail.com>
To: freebsd-questions@freebsd.org
Subject: Re: setting encrypted password for a user
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On Tue, 24 Dec 2013 01:23:00 -0800 (PST)
M. V. wrote:

> Hi,
> thank you for your answers,
> 
> so if we can't set password by just having MD5, I have to change the
> sender program to calculate and send hash of the passwords using
> salt. thus:
> - ...does anyone know how "salt" is being used in FreeBSD 
> crypt for encryption? is it a simple concatenation,etc or it's more 
> complex than that?

The latter:

http://svn.freebsd.org/base/head/lib/libcrypt/crypt-md5.c