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diff --git a/examples/ossl_x509.rb b/examples/ossl_x509.rb
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+++ b/examples/ossl_x509.rb
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+#!/usr/bin/env ruby
+
+require 'openssl'
+include OpenSSL
+include X509
+include PKey
+
+p x509 = Certificate.new(File.open("./01cert.pem").read)
+#puts x509.to_pem
+#p x509.serial
+#puts "Version = #{x509.version}"
+#p Name.new
+#p subject = x509.subject
+#p subject.to_s
+#p issuer = x509.issuer
+#p issuer.to_pem
+#p ary = issuer.to_a
+#p issuer.to_h
+#ary[3] = ["Email", "bow@wow.com"]
+#p x509.issuer = ary
+#p x509.not_before
+#p x509.not_before = Time.now
+#p x509.not_after
+#p k = x509.public_key
+#p k.private?
+#puts k.to_text
+#p priv = RSA.new(File.open("./01key.pem").read, "pejs8nek")
+#p priv.private?
+#p x509.public_key = priv
+#puts x509.public_key.to_text
+#p x509.issuer.to_s
+#p x509.sign(priv,MD5.new)
+#p x509.issuer.to_s
+#puts x509.to_text
+#x509.extensions.each_with_index {|e, i| p e.to_a}
+#puts "----end----"
+
+p key = RSA.new(1024)
+p new = Certificate.new
+name = [['O','Ruby'],['OU','Test'],['CN','test001'],['C','CZ']]
+#p n = Name.new(name)
+#p n.to_h
+#p n.to_a
+#p n.to_s
+#exit
+p new.subject = Name.new(name)
+p new.issuer = Name.new(name)
+p new.not_before = Time.now
+p new.not_after = Time.now + (60*60*24*365)
+p new.public_key = key #x509.public_key
+p new.serial = 999999999
+p new.version = 2
+#p new.extensions #each_with_index {|e, i| p e.to_a}
+maker = ExtensionFactory.new(nil, new) #only subject
+p ext1 = maker.create_extension(["basicConstraints","CA:FALSE,pathlen:5"])
+#p ext1.to_a
+#p ext1.to_h
+#p ext1.to_s
+#exit
+p ext2 = maker.create_extension(["nsComment","Generated by OpenSSL for Ruby."])
+###p digest = Digest::SHA1.new(new.public_key.to_der)
+###p ext3 = maker.create_extension(["subjectKeyIdentifier", digest.hexdigest])
+p ext3 = maker.create_extension(["subjectKeyIdentifier", "hash"])
+new.extensions = [ext1, ext2, ext3]
+maker.issuer_certificate = new # we needed subjectKeyInfo inside, now we have it
+p ext4 = maker.create_extension(["authorityKeyIdentifier", "keyid:always,issuer:always"])
+#puts ext1.to_s
+p new.add_extension(ext4)
+p new.sign(key, Digest::MD5.new)
+puts "===TEXT==="
+puts new.to_text
+puts "===PEM==="
+puts new.to_pem
+puts "===DER==="
+p new.to_der
+