openssl x509

OpenSSL command to manage X.509 certificates. More information: https://www.openssl.org/docs/manmaster/man1/openssl-x509.html.

• 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}}