You can use our CSR and Cert Decoder to get the SHA1 fingerprint of a certificate or CSR. This is fairly easy to do with the openssl command and its client functionality. That returns a tls.ConnectionState. Before you can obtain the thumbprint for an OIDC IdP, you need to obtain the OpenSSL command-line tool. For e.g. The decoder converts the CSR/certificate to DER format before calculating the fingerprint. Enter Mozilla Certificate Viewer I was working from console connection and couldn’t copy/paste details from the session. I have just created a certificate for my Apache SSL host using: ... Now what is the correct way to get the fingerprint out of it? What I've done so far: my iCloud Account, accoding to apple.com this looks like. The solution? First find out the server domain and the port for you mail. The challenge? Under tls.ConnectionState, PeerCertificates gives the certificates for that TLS connection. Then click the line containing your selection, which the certificate should be highlighted thereafter. How to view an X.509 PEM certificate's fingerprint using `openssl` commands. SHA256: "-md5" - Use the MD5 digest algorithm to generate the fingerprint "-sha1" - Use the SHA-1 digest algorithm to generate the fingerprint ⇒ OpenSSL "x509 -x509toreq" - Conver Certificate to CSR openssl dgst -sha1 certificate.der To get the SHA1 fingerprint of a certificate using OpenSSL, use the command shown below. If you needed to get fingerprint details of the certificate in MD5, SHA1 or SHA256 format then you have run below steps on the extracted certificate file on macOS. (I always specify the fingerprint to check in getmail's configuration file, and I get this fingerprint from the OpenSSL command-line tool.) I use getmail, a tool written in Python, to retrieve my mail via IMAP.Today it suddenly stopped working because it complains about an SSL fingerprint mismatch. Click View to open the Mozilla Certificate Viewer. The following little script will take a given domain (no https prefix) and an SHA-1 fingerprint, and exit with no error (0) if the retrieved fingerprint matches, but with exit code 1 if there is no match. OpenSSL can be used to convert certificates to and from a large variety of these formats. You use this tool to download the OIDC IdP's certificate chain and produce a thumbprint of the final certificate in the certificate chain. Perfect, Raw field in x509.Certificate provides the DER content we want. (So I can keep it in other place for visual comparison---in case I need to connect and really don't trust the network?) I was troubleshooting a certificate issue today that required me to verify the thumbprint of a leaf cert. To create a TLS connection, we'll be using tls.Dial. "-fingerprint" - Print out a fingerprint (digest) of the certificate. Well we can here use openssl for the rescue. 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