Re: BUG #19335: the function encrypt does not work correct - ERROR: encrypt error: Key was too big

Daniel Gustafsson <daniel@yesql.se> writes:
> On 28 Nov 2025, at 11:38, <Marco.Lebahn@kfw.de> <Marco.Lebahn@kfw.de> wrote:
>> It seems that < 16.11 does and not check if I use "bf" from legacy provider

> OpenSSL doesn't support blowfish without the legacy provider loaded.  Your
> 16.10 is most likely linked against another version of OpenSSL, or at least
> using another OpenSSL configuration/openssldir.

It seems quite odd that this changed at a minor PG version update.
I wonder if there was an upgrade of the underlying platform at the
same time, or if the new version was built by a different packager.

I confirmed on a fresh Fedora installation (with OpenSSL 3.2.6)
that it works as Daniel described.  Blowfish and other old ciphers
don't work with the out-of-the-box OpenSSL configuration, but if
you edit `openssl info -configdir`/openssl.cnf and uncomment the
lines that enable the legacy provider, it will work.  (I found
I had to restart the PG server, too --- apparently we only absorb
that configuration at postmaster start.  Didn't think to try
"pg_ctl reload"; perhaps that would have been enough.)

Of course the real bottom line here is you should be migrating
away from use of these ciphers.  There's a reason they are
deprecated and intentionally made hard-to-reach.

            regards, tom lane