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Extract SHA256 certificate thumbprint in Nginx

Posted by knidhirajan 
Extract SHA256 certificate thumbprint in Nginx
August 07, 2023 10:26PM
I have used Nginx as a proxy infront of my authorization server (IDP) which handles mtls. We have a requirement to extract SHA256 fingerprint from client certificate in Nginx and forward it to the underlying auth server endpoint.
Nginx variable $ssl_client_fingerprint returns the SHA1 fingerprint of the client certificate. Is there a way to extract SHA256 fingerprint of the client cert?
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