|  | 
 | .. _crypto: | 
 |  | 
 | ********************** | 
 | Cryptographic Services | 
 | ********************** | 
 |  | 
 | .. index:: single: cryptography | 
 |  | 
 | The modules described in this chapter implement various algorithms of a | 
 | cryptographic nature.  They are available at the discretion of the installation. | 
 | Here's an overview: | 
 |  | 
 |  | 
 | .. toctree:: | 
 |  | 
 |    hashlib.rst | 
 |    hmac.rst | 
 |  | 
 | .. index:: | 
 |    pair: AES; algorithm | 
 |    single: cryptography | 
 |    single: Kuchling, Andrew | 
 |  | 
 | Hardcore cypherpunks will probably find the cryptographic modules written by | 
 | A.M. Kuchling of further interest; the package contains modules for various | 
 | encryption algorithms, most notably AES.  These modules are not distributed with | 
 | Python but available separately.  See the URL | 
 | http://www.amk.ca/python/code/crypto.html  for more information. | 
 |  |