Verify cert against CA openssl

Check cert matches key diff <(openssl x509 -pubkey -noout -in cert.pem) <(openssl pkey -pubout -in key.pem) && echo 'MATCH' Convert PEM to PKCS#12 openssl pkcs12 -export -in cert.pem -inkey key.pem -certfile ca.pem -out bundle.p12 -name myalias Extract cert from PKCS#12 openssl pkcs12 -in bundle.p12 -nokeys -out cert.pem && openssl pkcs12 -in bundle.p12 -nocerts -nodes -out key.pem Check live TLS cert echo | openssl s_client -connect example.com:443 -servername example.com 2>/dev/null | openssl x509 -noout -dates -subject -issuer Check full cert chain openssl s_client -connect example.com:443 -showcerts 2>/dev/null | openssl crl2pkcs7 -nocrl | openssl pkcs7 -print_certs -noout -text | grep -E 'Subject:|Issuer:'