Cryptographic Functions
=======================

We provide implementations of several cryptographic algorithms that you can use
in your implementation.

These utilities are defined in `userlib`_, which is already imported into
`proj2.go`_.
   
.. important::
  You **cannot** use any external cryptography libraries. The autograder will
  refuse external libraries except those given in `proj2.go`_ (see
  :doc:`/grading/code`).

The following pages document the crypto functions provided in `userlib`_.

.. toctree::
    public_key_encryption.rst
    digital_signatures.rst
    hash.rst
    hmac.rst
    hkdf.rst
    password_key_derivation.rst
    symmetric_encryption.rst
    random_byte_generator.rst

.. _userlib: https://github.com/cs161-staff/project2-userlib/blob/master/userlib.go
.. _proj2.go: https://github.com/cs161-staff/project2-starter-code/blob/main/proj2.go