py311-pyderasn

Strict and fast ASN.1 DER/CER/BER library for Python

PyDERASN -- strict and fast ASN.1 DER/CER/BER library for Python * 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