It seems this error is related to the FIPS support in the opensuse openssl 1.0.x.
- [bug ubuntu](https://bugs.launchpad.net/ubuntu/+source/openssl/+bug/1594748) - [bug python](https://bugs.python.org/issue18227)
$ openssl version OpenSSL 1.0.2j-fips 26 Sep 2016
[Link suse.com](https://www.suse.com/c/fipsified/)
So as already mentioned, it seems that the openssl version shipped with Opensuse 42.3 is not usable for the tls module. Funny fact, if you disable the FIPS mode, openssl actually aborts directly:
export OPENSSL_FORCE_FIPS_MODE="0" $ LANG=C; openssl version -v fips.c(139): OpenSSL internal error, assertion failed: FATAL FIPS SELFTEST FAILURE Aborted (core dumped)