---
title: X501
url: 'https://brendo.org/wp-content/plugins/two-factor-provider-webauthn/vendor/sop/x501'
markdown: 'https://brendo.org/wp-content/plugins/two-factor-provider-webauthn/vendor/sop/x501.md'
date: '2026-04-06'
description: 'X.501 A PHP library for X.501 ASN.1 types, X.520 attributes and DN parsing. Requirements PHP >=7.2 intl mbstring sop/asn1 Installation This library is available on Packagist. composer require sop/x501 License This project is licensed under the MIT License.'
---

# X.501

[![Build Status](https://travis-ci.org/sop/x501.svg?branch=master)](https://travis-ci.org/sop/x501)[![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/sop/x501/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/sop/x501/?branch=master)[![Coverage Status](https://coveralls.io/repos/github/sop/x501/badge.svg?branch=master)](https://coveralls.io/github/sop/x501?branch=master)[![License](https://poser.pugx.org/sop/x501/license)](https://github.com/sop/x501/blob/master/LICENSE)

A PHP library for X.501 ASN.1 types, X.520 attributes and DN parsing.

## Requirements

- PHP >=7.2
- intl
- mbstring
- [sop/asn1](https://github.com/sop/asn1)

## Installation

This library is available on [Packagist](https://packagist.org/packages/sop/x501).

```
composer require sop/x501
```

## License

This project is licensed under the MIT License.

---

## Navigation

- Previous: [Crypto-types](https://brendo.org/wp-content/plugins/two-factor-provider-webauthn/vendor/sop/crypto-types.md)
- Next: [X509](https://brendo.org/wp-content/plugins/two-factor-provider-webauthn/vendor/sop/x509.md)