kelunik/acme

ACME library written in PHP.

v2.1.0 2026-05-09 20:07 UTC

Requires

• php: >=8.1
• ext-openssl: *
• amphp/amp: ^3.1.0
• amphp/byte-stream: ^2.1.2
• amphp/dns: ^2.4.0
• amphp/file: ^4 || ^3.2.0
• amphp/http-client: ^5.3.3
• amphp/socket: ^2.3.1
• beberlei/assert: ^3.3.3
• kelunik/certificate: ^1.1.3
• league/uri: ^7.8.1
• psr/http-message: ^2.0
• psr/log: ^1 || ^2 || ^3
• symfony/polyfill-php83: ^1.32.0

Requires (Dev)

• amphp/php-cs-fixer-config: ^2.1.0
• phpunit/phpunit: ^10.5.63
• psalm/phar: 6.16.1

MIT

• Niklas Keller

• https
• encryption
• ssl
• tls
• certificate
• letsencrypt
• ACME

README

kelunik/acme is a non-blocking implementation of the ACME protocol (RFC 8555). Non-blocking I/O is scheduled under the hood by Revolt.

Tip

If you're looking for a PHP client, have a look at kelunik/acme-client which is based on this library.

Installation

composer require kelunik/acme

This package follows semantic versioning. It requires PHP 8.1 or later.