Detect if `pg_crypto` in Postgres was built with strong random feature enabled The source code for pg_crypto module mentions an option to build without cryptographically-strong random generation.

/*

Generate random bits. pg_backend_random() will do here, we don't promis

UUIDs to be cryptographically random, when built with

--disable-strong-random.


*/

Discussed further in this thread.
In the particular build I may be using, how can I detect if the strong random feature is enable or disabled?
--disable-strong-random is a PostgreSQL configuration option available in the ./configure script in the source code. You could check to see if your version of PostgreSQL and the associated contrib modules were built with it by using pg_config --configure and looking to see if that particular flag was passed in as part of the config process. Though as it says in the thread that was linked, no reasonable production platform would use that flag, so odds are that you've got a cryptographically random build.