openssl

  • openssl s_client -connect http://www.google.com:443 -showcerts : show SSL certficate
  • echo -n | openssl s_client -connect http://www.google.com:443 -showcerts | sed -ne ‘/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p’ | openssl x509 -noout -subject -dates  : display dates for the certificate
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