This module contains cryptographic primitives as defined and used
by OpenPGP. It abstracts over the cryptographic library chosen at
compile time. Most of the time, it will not be necessary to
explicitly use types from this module directly, but they are used
in the API (e.g.
Password). Advanced users may use these
primitives to provide custom extensions to OpenPGP.
Cryptographic hash functions and hashing of OpenPGP data structures.
Memory protection and encryption.
String-to-Key (S2K) specifiers.