Translate OpenSSL 3.0 digest names to OpenSSL 1.1 digest names

Translate OpenSSL 3.0 digest names to OpenSSL 1.1 digest names

Since we used the OpenSSL <=1.1 names as part of our OCC message, they
are now unfortunately part of our wire protocol.

OpenSSL 3.0 will still accept the "old" names so we do not need to use
this translation table for forward lookup, only for returning the name
with md_kt_name()

Backport of master commit 88342ed8277c5797.

Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Antonio Quartulli <a@unstable.cc>
Message-Id: <20220523103546.3425388-1-arne@rfc2549.org>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg24424.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>