Hi folks: Me and the rest of the team is developing SqueakDBX which is a driver to talk with major databases. However, I think the most persistence alternatives pharo has, the best. There is no better solution for every escenario. So, I am also trying to get the PostgreSQL native driver to work in Pharo. This package depends on Cryptography because of MD5. I know that there were added to Pharo packages like System-Hashing-core, System-Hashing-SHA1 and System-Hashing-MD5. However, the driver doesn't work yet. But adding this single method: ByteArray>>hex | stream | stream _ '' writeStream. self do: [ :each | stream nextPut: ('0123456789ABCDEF' at: each // 16 + 1); nextPut: ('0123456789ABCDEF' at: each \\ 16 + 1)]. ^ stream contents The driver works like a charm in Pharo without needing Cryptography package. As far as I remember there were no MIT problem with this package. Because of this those packages ( System-Hashing-core, System-Hashing-SHA1 and System-Hashing-MD5) were integrated in Pharo. So, can I add it? Thanks Mariano