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openssl x509

OpenSSL command to manage X.509 certificates. More information:

  • Display certificate information:

openssl x509 -in {{filename.crt}} -noout -text

  • Display a certificate's expiration date:

openssl x509 -enddate -noout -in {{filename.pem}}

  • Convert a certificate between binary DER encoding and textual PEM encoding:

openssl x509 -inform {{der}} -outform {{pem}} -in {{original_certificate_file}} -out {{converted_certificate_file}}

  • Store a certificate's public key in a file:

openssl x509 -in {{certificate_file}} -noout -pubkey -out {{output_file}}