Python ASN.1 DER/CER/BER codec with abstract structures
Project description
PyDERASN – strict and fast ASN.1 DER/CER/BER library for Python
I’m going to build my own ASN.1 library with slots and blobs! (C) PyDERASN’s author
- BER/CER/DER decoding, strict DER validation, DER/CER encoding
- Basic ASN.1 data types (X.208): BOOLEAN, INTEGER, BIT STRING, OCTET STRING, NULL, OBJECT IDENTIFIER, ENUMERATED, all strings, UTCTime, GeneralizedTime, CHOICE, ANY, SEQUENCE (OF), SET (OF)
- Size constraints checking
- Working with sequences as high level data objects with ability to (un)marshall them
- Aimed to be complaint with X.690-201508
- Streaming decoding and encoding capabilities, allowing working with very small memory footprint
- Python 3.5+ compatibility
- Automatic decoding of DEFINED BY fields
- Ability to know exact decoded objects offset and lengths in the binary
- Ability to allow BER-encoded data with knowing if any of specified field has either DER or BER encoding (or possibly indefinite-length encoding)
- Ability to use mmap-ed files, memoryviews, iterators, 2-pass DER encoding mode and CER encoder dealing with the writer, giving ability to create huge ASN.1 encoded files with very little memory footprint
- Ability to decode files in event generation mode, without the need to keep all the data and decoded structures in the memory
- __slots__, copy.copy() friendliness
- Workability with pickle
- Cython compatibility
- Descriptive errors, with decode paths
- Pretty printer and command-line decoder, that could conveniently replace utilities like either dumpasn1 or openssl asn1parse
pyderasn is free software: see the file COPYING.LESSER for copying conditions.
PyDERASN home page is: http://www.pyderasn.cypherpunks.ru/
Please send questions, bug reports and patches to http://lists.cypherpunks.ru/pyderasn_002ddevel.html mailing list. Announcements also go to this mailing list.
Development Git source code repository currently is located here: http://www.git.cypherpunks.ru/?p=pyderasn.git;a=summary
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