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DER-Encoded ASN.1 Serialization and Deserialization

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Bran provides transcoders for ASN.1 serialization and deserialization, and DER-encoding.

The purpose is to provide a serialization format for native Python types, such as nested dicts, whose serialization is unambiguous and stable, that is two values with the same contents serialize to the same byte string.

That makes it possible to create hashes and MACs to verify message integrity.



You just encode some values. In most cases, you’ll want to use the DERTranscoder class.

test = { 'some': { 'nested': 42, 'value': (0, 1, False) } }

from bran import DERTranscoder
transcoder = DERTranscoder()

encoded = transcoder.encode(test)
decoded = transcoder.decode(encoded)

assert decoded == test

In order for bran to be this simple to use, some assumptions are made. The one with the most impact is that it treats any collections.Mapping will be encoded to the same byte representation, which means when decoded, it will become a Python dict. Similar assumptions are made for collections.Set and collections.Sequence.


Use virtualenv to create a virtual environment and change to it or not, as you see fit.

Then install the requirements:

$ pip install -r requirements.txt


After setup, run the following to generate documentation:

$ python build_sphinx


Test Execution

Run the whole test suite:

$ python test

Run a single test scenario:

$ pytest tests/

Run tests on multiple Python versions:

$ tox

Run tests on Python 2.7:

$ tox -e py27

A simple test coverage report is automatically generated.


Licensed under MITNFA (MIT +no-false-attribs) License. See the LICENSE.txt file for details.

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