uacme

Lightweight C ACMEv2 client which uses external authenticators

Lightweight client for the RFC8555 ACMEv2 protocol, written in plain C with minimal dependencies (libcurl and one of GnuTLS, OpenSSL or mbedTLS). The ACMEv2 protocol allows a Certificate Authority (Let's Encrypt is a popular one) and an applicant to automate the process of verification and certificate issuance. The protocol also provides facilities for other certificate management functions, such as certificate revocation.