I also downgraded libssl1.0.2:amd64 when investigating, so reportbug shows the older version. The bug originally showed with libssl1.0.2:amd64 (1.0.2j-4) and is reproducible with either version, dependent on the version of python-cryptography.
-- Neil Williams ============= http://www.linux.codehelp.co.uk/
pgpAnsp6UWlO5.pgp
Description: OpenPGP digital signature