openssl.cert.parse.rb

require 'openssl'
data=`echo 'quit'|openssl s_client -connect google.com:443 2> /dev/null &`

cert = OpenSSL::X509::Certificate.new(data) 

ms=cert.methods-Object.methods
ms=ms-ms.grep(/=|to|public_key/)
puts ms.map{|m|[m,(cert.send(m) rescue nil)]}.select{|a,b|!b.nil?}