openssl x509

OpenSSL command to manage X.509 certificates.

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• 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}

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