CycloneACME
ACME Client Library

CycloneACME is a client implementation of ACME (Automatic Certificate Management Environment) dedicated to embedded applications. This solution can be used to automate the process of managing X.509 certificates (ordering, renewal, revocation) with a remote certification authority like Let's Encrypt. ACME allows deployment of public-key infrastructure on Internet-facing devices (HTTPS server for example) at very low cost.

CycloneACME is available either as open source (GPLv2 license) or under a royalty-free commercial license (non-GPL license). We also propose an evaluation license (90-day license in source form) with technical support for an easier onboarding and effective evaluation of our software.

Main Features

• ACME v2 protocol implementation
• Client mode of operation
• ACME account management (creation, update, deactivation and key rollover)
• Certificate management (ordering, renewal and revocation)
• Supports RSA, ECDSA and EdDSA certificates
• Supports standard ACME challenges (HTTP, DNS and TLS-ALPN)
• ACME-DNS client provides a simple way to automate ACME DNS challenges
• Compatible with ACME servers such as Let's Encrypt, Encryption Everywhere or Buypass Go SSL
• Comprehensive user API
• Flexible memory footprint. Built-time configuration to embed only the necessary features
• Portable architecture (no processor dependencies)
• The library is distributed as a full ANSI C and highly maintainable source code

Supported ACME Challenges

• http-01 (HTTP-based challenge type)
• tls-alpn-01 (TLS-based challenge type)
• dns-01 (DNS-based challenge type)

Supported Signature Algorithms

• RSA
• ECDSA
• Ed25519
• Ed448