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Cipher Feedback Mode, CFB, is a self-synchronizing stream cipher which is very similar to CBC performed in reverse. Since OpenSSL supports it, we can easily plug it into the existing cipher selection code without any need for infrastructure changes. This patch was simultaneously submitted by Umar Hayat and Vladyslav Nebozhyn, the latter whom suggested the feauture. The committed patch is Umar's version. Author: Umar Hayat <postgresql.wizard@gmail.com> Reviewed-by: Daniel Gustafsson <daniel@yesql.se> Reviewed-by: Álvaro Herrera <alvherre@alvh.no-ip.org> Discussion: https://postgr.es/m/CAPBGcbxo9ASzq14VTpQp3mnUJ5omdgTWUJOvWV0L6nNigWE5jw@mail.gmail.com