X509 GUI Certificate Viewer

Features

• X509 viewer tool for Windows and Linux Mono . Displays Offline and Online certificates with the associated CRL and/or OCSP data.
• Offline : drag/drop certificate files to show content. All files formats are accepted. Also works with PEM encoded certificate from clipboard.
• Online : paste the URL to download and show content . TLS (https, wss), DTLS, OPC UA, QUIC and SMTP StartTLS protocols are supported.
• Click on the CRL link to download and view it. Allows to save it to a file.
• Click on the OCSP link to check the revocation status. Shows if signature is delegated.
• Certificate validation done with the Windows/Linux Store and with a private PKI.
• True validation of Signatures in the Signed Certificate Timestamp List
• Can be used to extract a certificate from a running OPC/TLS/DTLS/QUIC/SMTP server with one click.
• Can be used as a format converter tool : .pfx, .der (binary), .crt/.pem (base64) to .der or .crt/.pem
• Can verify the correspondence between the private key file (plain and encrypted) and the current certificate. A simple drop of the .pem, .der, .pvk file with the key is enough.
• Essential for teaching and verification of OPC/TLS/DTLS/QUIC/SMTP secure servers.
• ... and a standalone tool dedicated to OPC UA Endpoints & Certificates

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