Was broken by the switch to using OpenSSL's EVP interface for ciphers, in commit 5ff4a67f. Reported by Andres Freund. Fix by Michael Paquier with some kibitzing by me. Discussion: https://www.postgresql.org/message-id/20161201014826.ic72tfkahmevpwz7@alap3.anarazel.de
5ff4a67f