
Cryptographic Services
**********************

The modules described in this chapter implement various algorithms of
a cryptographic nature.  They are available at the discretion of the
installation. On Unix systems, the "crypt" module may also be
available. Here's an overview:

* "hashlib" --- Secure hashes and message digests

  * Hash algorithms

  * Key derivation

* "hmac" --- Keyed-Hashing for Message Authentication
