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# 15. Cryptographic Services

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:

- 15.1. `hashlib` — Secure hashes and message digests
- 15.2. `hmac` — Keyed-Hashing for Message Authentication
- 15.3. `md5` — MD5 message digest algorithm
- 15.4. `sha` — SHA-1 message digest algorithm

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.

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