openssl-x509

OpenSSL command to manage X.509 certificates.

TLDR

Display certificate information

$ openssl x509 -in [filename.crt] -noout -text
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Display a certificate's expiration date

$ openssl x509 -enddate -noout -in [filename.pem]
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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]
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Store a certificate's public key in a file

$ openssl x509 -in [certificate_file] -noout -pubkey -out [output_file]
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