In PostgreSQL, using the pgcrypto module, I can generate a slow hash with blowfish (or any supported algorithm) like this:
crypt('SomeTextHere', gen_salt('bf'));
However, it auto-generates a salt (with gen_salt) and requires it. I don't want to use any salt. I am also not interested in using a normal hashing function (like sha256). How can I generate a slow hash without a salt?