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ASN.1 types and codecs

Project description

ASN.1 library for Python

This is an implementation of ASN.1 types and codecs in Python programming language. It has been first written to support particular protocol (SNMP) but then generalized to be suitable for a wide range of protocols based on ASN.1 specification.


  • Generic implementation of ASN.1 types (X.208)

  • Fully standard compliant BER/CER/DER codecs

  • 100% Python, works with Python 2.4 up to Python 3.3

  • MT-safe


  • No ASN.1 compiler (by-hand ASN.1 spec compilation into Python code required)

  • Codecs are not restartable


The pyasn1 package uses setuptools/distutils for installation. Thus do either:

$ easy_install pyasn1


$ tar zxf pyasn1-0.1.7.tar.gz

$ cd pyasn1-0.1.7

$ python install

$ python test # run unit tests


Perhaps a typical use would involve [by-hand] compilation of your ASN.1 specification into pyasn1-backed Python code at your application.

For more information on pyasn1 APIs, please, refer to the doc/pyasn1-tutorial.html file in the distribution.

Also refer to example modules. Take a look at pyasn1-modules package – maybe it already holds something useful to you.


The pyasn1 package is distributed under terms and conditions of BSD-style license. See LICENSE file in the distribution. Source code is freely available from:


Please, send your comments and fixes to mailing lists at project web site.

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