---
id: asn1crypto
version: "1.5.1"
license: MIT
license_treatment: permissive
maintenance: active
---

# asn1crypto — Fast ASN.1 parser and serializer with definitions for private keys, public keys, certificates, CRL, OCSP, CMS, PKCS#3, PKCS#7, PKCS#8, PKCS#12, PKCS#5, X.509 and TSP

License: permissive · Maintenance: active · Popularity: top 1,000 on PyPI

## Install

pip install asn1crypto
uv add asn1crypto
poetry add asn1crypto

## Description

# asn1crypto

A fast, pure Python library for parsing and serializing ASN.1 structures.

 - [Features](#features)
 - [Why Another Python ASN.1 Library?](#why-another-python-asn1-library)
 - [Related Crypto Libraries](#related-crypto-libraries)
 - [Current Release](#current-release)
 - [Dependencies](#dependencies)
 - [Installation](#installation)
 - [License](#license)
 - [Security Policy](#security-policy)
 - [Documentation](#documentation)
 - [Continuous Integration](#continuous-integration)
 - [Testing](#testing)
 - [Development](#development)
 - [CI Tasks](#ci-tasks)

[![GitHub Actions CI](https://github.com/wbond/asn1crypto/workflows/CI/badge.svg)](https://github.com/wbond/asn1crypto/actions?workflow=CI)
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## Features

In addition to an ASN.1 BER/DER decoder and DER serializer, the project includes
a bunch of ASN.1 structures for use with various common cryptography standards:

| Standard               | Module                                      | Source...

## AI interpretation — verify before relying

asn1crypto parses and serializes ASN.1 structures used in cryptography standards including X.509 certificates, CRLs, CSRs, OCSP, and PKCS formats, with a focus on performance and Pythonic APIs.

Verdict: asn1crypto is a production-ready, dependency-free ASN.1 library with strong cryptographic standards support and no known vulnerabilities. Active repository status and recent commits indicate ongoing maintenance.

[View on SkillFed](https://skillfed.io/packages/asn1crypto) · [View on PyPI](https://pypi.org/project/asn1crypto/)