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This module implements a common interface to many different secure hash and message digest algorithms. Included are the FIPS secure hash algorithms SHA1, SHA224, SHA256, SHA384, and SHA512 (defined in FIPS 180-2) as well as RSA’s MD5 algorithm (defined in Internet RFC 1321).
SHA1 and MD5 algorithms are not currently supported by the CircuitPython module, but constructors/sub-modules are included in the library to retain backwards-compatibility with the CPython3
hashlibmodule's available algorithms.This library is based on the work performed in the micropython-lib hashlib module by Paul Sokolovsky. I refactored
__init__.pyto expose the available algorithms (accessible by calling thealgorithms_availableconstructor, mimicking CPython), added classes for SHA1/MD5, comments and linting performed in all the algorithm sub-modules, exposed submodule classname("suitable as a parameter to new() to create another hash of this type", same as CPython). The unittest-like tests within _sha256.py and _sha512.py have been removed to save space.ReadTheDocs for this module has been created (https://circuitpython.readthedocs.io/projects/hashlib/en/latest) and will be online post-merge.