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> OpenSSL command to manage X.509 certificates.
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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