模块 OpenSSL :: OCSP

subject = OpenSSL::X509::Certificate.new subject_pem
issuer  = OpenSSL::X509::Certificate.new issuer_pem

digest = OpenSSL::Digest::SHA1.new
certificate_id =
  OpenSSL::OCSP::CertificateId.new subject, issuer, digest

request = OpenSSL::OCSP::Request.new
request.add_certid certificate_id

request.add_nonce

authority_info_access = subject.extensions.find do |extension|
  extension.oid == 'authorityInfoAccess'
end

descriptions = authority_info_access.value.split "\n"
ocsp = descriptions.find do |description|
  description.start_with? 'OCSP'
end

require 'uri'

ocsp_uri = URI ocsp[/URI:(.*)/, 1]

require 'net/http'

http_response =
  Net::HTTP.start ocsp_uri.hostname, ocsp.port do |http|
    http.post ocsp_uri.path, request.to_der,
              'content-type' => 'application/ocsp-request'
end

response = OpenSSL::OCSP::Response.new http_response.body
response_basic = response.basic

store = OpenSSL::X509::Store.new
store.set_default_paths

unless response_basic.verify [], store then
  raise 'response is not signed by a trusted certificate'
end

puts response.status_string #=> successful

p request.check_nonce basic_response #=> value from -1 to 3

single_response = basic_response.find_response(certificate_id)

unless single_response
  raise 'basic_response does not have the status for the certificiate'
end

unless single_response.check_validity
  raise 'this_update is in the future or next_update time has passed'
end

case single_response.cert_status
when OpenSSL::OCSP::V_CERTSTATUS_GOOD
  puts 'certificate is still valid'
when OpenSSL::OCSP::V_CERTSTATUS_REVOKED
  puts "certificate has been revoked at #{single_response.revocation_time}"
when OpenSSL::OCSP::V_CERTSTATUS_UNKNOWN
  puts 'responder doesn't know about the certificate'
end