This is a “Hazardous Materials” module. You should ONLY use it if you’re 100% absolutely sure that you know what you’re doing because this module is full of land mines, dragons, and dinosaurs with laser guns.

Decrepit cryptography

This module holds old, deprecated, and/or insecure cryptographic algorithms that may be needed in exceptional cases for backwards compatibility or interoperability reasons. Unless necessary their use is strongly discouraged.