The Dogtag Certificate System is an enterprise-class Certificate Authority (CA) which supports all aspects of certificate lifecycle management, including key archival, OCSP and smartcard management.
Verifier for C2PA Content Credentials in pure PHP: JPEG, PNG, WebP and ISOBMFF, with c2patool's verdict. Read and verify only; no signing, no keys, no network.
PKI.js is a pure JavaScript library implementing the formats that are used in PKI applications (signing, encryption, certificate requests, OCSP and TSP requests/responses). It is built on WebCrypto (Web Cryptography API) and requires no plug-ins.