This was new for me, I was looking how to get the noCertificado from a CSD
(Certificado de Sello Digital) and I found it is the serial of the
certificate but in base 2.
In ruby you can get it with a OpenSSL::X509::Certificate
raw = File.read("my_cert.cer")
cert = OpenSSL::X509::Certificate.new(raw)
If you ask the serial you will get an OpenSSL::BN
cert.serial # => an OpenSSL::BN
And then you can ask the for the to_s of that object. By default it will return it with base 10
cert.serial.to_s == cert.serial.to_s(10) # => true
…but you can ask for it in base 2, this is the noCertificado =)
cert.serial.to_s(2) # => "noCertificato" value...
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