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Description:

asn1 2.7.1

Python-ASN1 is a simple ASN.1 encoder and decoder for Python 2.7 and 3.5+.

Features

Support BER (parser) and DER (parser and generator) encoding (except indefinite lengths)
100% python, compatible with version 2.7, 3.5 and higher
Can be integrated by just including a file into your project

Dependencies
Python-ASN1 relies on Python-Future for Python 2 and 3 compatibility. To install Python-Future:
pip install future

How to install Python-asn1
Install from PyPi with the following:
pip install asn1
or download the repository from GitHub and install with the following:
python setup.py install
You can also simply include asn1.py into your project.

How to use Python-asn1

Note
You can find more detailed documentation on the Usage page.

Encoding
If you want to encode data and retrieve its DER-encoded representation, use code such as:
import asn1

encoder = asn1.Encoder()
encoder.start()
encoder.write('1.2.3', asn1.Numbers.ObjectIdentifier)
encoded_bytes = encoder.output()

Decoding
If you want to decode ASN.1 from DER or BER encoded bytes, use code such as:
import asn1

decoder = asn1.Decoder()
decoder.start(encoded_bytes)
tag, value = decoder.read()

Documentation
The complete documentation is available on Read The Docs:
python-asn1.readthedocs.io

License
Python-ASN1 is free software that is made available under the MIT license.
Consult the file LICENSE that is distributed together with this library for
the exact licensing terms.

Copyright
The following people have contributed to Python-ASN1. Collectively they own the copyright of this software.

Geert Jansen (geert@boskant.nl): original implementation.
Sebastien Andrivet (sebastien@andrivet.com)

Changelog

2.7.1 (2024-08-07

Fix OID encoding/decoding for the first octet according to ITU-T X.690 (thanks to Ian Neal)

2.7.0 (2023-01-17)

Add context manager support (thanks to Mastermind-U)

2.6.0 (2022-07-15)

Add support for GeneralizedTime (thanks to vollkorntomate)

2.5.0 (2022-03-03)

Fixes to BitString decoding and encoding of IA5String and UTCTime (thanks to 0xbf00)

2.4.2 (2021-10-29)

Fix a minor mistake in the dump.py example
Add Python 3.9 and 3.10

2.4.1 (2020-07-16)

Fix #89 - Replace explicit references to enum34 by enum-compat

2.4.0 (2020-06-23)

Fix #21 - Invalid decoding in non-Universal classes
Fix #57 - Invalid encoding of non-Universal classes

2.3.1 (2020-04-06)

No change in code, only in packaging and in texts (README, …)

2.3.0 (2020-04-05)

Tests: Replace nose by pytest
Add Python 3.8, remove Python 3.4 support
PR#26 (from rumbah): Add test for default (implicit) encoding types
PR#25 (from thomwiggers): Attempt to support BIT STRING
Fix wrong example code, see #27
(from jcrowgey) Makes the package usable with pip install
Remove support of Python 3.3 (some dependencies do not support 3.3)
PR#15 (from ThePlasmaRailgun) Fix parsing of object identifier
PR#10 (from robinleander): Allow user to determine decoding tagtype

2.2.0 (2017-10-30)

Use “true” enums instead of classes. Use enun34 backport for old Python versions.

2.1.1 (2017-10-30)

Fix a bug (#9): two’s complement corner case with values such as -32769. Add new test cases to test them.

2.1.0 (2016-12-18)

Add more documentation
Use (simulated) enumerations
Add Python 2.6 in automated checks and tests
Add type hints (for static checking) and fix some code

2.0.0 (2016-12-16)

First public release by Sebastien Andrivet
Support both python 2 and 3 (with Python-Future)
All strings are now in unicode
Add more ASN.1 tags (like PrintableString)
Fix errors in the example (dump.py)
Code reorganization

0.9 (2011-05-18)

Initial public release by Geert Jansen