Added support for new PolarSSL 1.1 RNG

Added support for new PolarSSL 1.1 RNG

This patch, while retaining PolarSSL 1.0 support, introduces the PolarSSL 1.1 DRBG.
This RNG adds a number of features, including support for personalisation strings
and multiple entropy sources.

Personalisation strings have been implemented, based on PID, program name, place
within memory, and a hash of the user's certificate.

The entropy sources used are the platform default ones. Which ones these are
depends on how PolarSSL was built, but usually this includes:

 - /dev/urandom or the Windows CryptoAPI RNG
 - the HAVEGE RNG
 - the output of PolarSSL's hardclock() call (usually RDTSC)

Finally, this patch moves to only one instance of the RNG  per OpenVPN instance,
instead of one per keystate

Signed-off-by: Adriaan de Jong <dejong@fox-it.com>
Signed-off-by: Eelse-jan Stutvoet <stutvoet@fox-it.com>
Acked-by: James Yonan <james@openvpn.net>
Message-Id: 1333351687-3732-1-git-send-email-dejong@fox-it.com
URL: http://article.gmane.org/gmane.network.openvpn.devel/6210
Signed-off-by: David Sommerseth <davids@redhat.com>