def create_self_signed_cert(bits, cn, comment)
      rsa = OpenSSL::PKey::RSA.new(bits){|p, n|
        case p
        when 0; $stderr.putc "."  # BN_generate_prime
        when 1; $stderr.putc "+"  # BN_generate_prime
        when 2; $stderr.putc "*"  # searching good prime,
                                  # n = #of try,
                                  # but also data from BN_generate_prime
        when 3; $stderr.putc "\n" # found good prime, n==0 - p, n==1 - q,
                                  # but also data from BN_generate_prime
        else;   $stderr.putc "*"  # BN_generate_prime
        end
      }
      cert = OpenSSL::X509::Certificate.new
      cert.version = 2
      cert.serial = 1
      name = OpenSSL::X509::Name.new(cn)
      cert.subject = name
      cert.issuer = name
      cert.not_before = Time.now
      cert.not_after = Time.now + (365*24*60*60)
      cert.public_key = rsa.public_key

      ef = OpenSSL::X509::ExtensionFactory.new(nil,cert)
      ef.issuer_certificate = cert
      cert.extensions = [
        ef.create_extension("basicConstraints","CA:FALSE"),
        ef.create_extension("keyUsage", "keyEncipherment"),
        ef.create_extension("subjectKeyIdentifier", "hash"),
        ef.create_extension("extendedKeyUsage", "serverAuth"),
        ef.create_extension("nsComment", comment),
      ]
      aki = ef.create_extension("authorityKeyIdentifier",
                                "keyid:always,issuer:always")
      cert.add_extension(aki)
      cert.sign(rsa, OpenSSL::Digest::SHA1.new)

      return [ cert, rsa ]
    end
def create_self_signed_cert(bits, cn, comment)
      rsa = OpenSSL::PKey::RSA.new(bits){|p, n|
        case p
        when 0; $stderr.putc "."  # BN_generate_prime
        when 1; $stderr.putc "+"  # BN_generate_prime
        when 2; $stderr.putc "*"  # searching good prime,
                                  # n = #of try,
                                  # but also data from BN_generate_prime
        when 3; $stderr.putc "\n" # found good prime, n==0 - p, n==1 - q,
                                  # but also data from BN_generate_prime
        else;   $stderr.putc "*"  # BN_generate_prime
        end
      }
      cert = OpenSSL::X509::Certificate.new
      cert.version = 2
      cert.serial = 1
      name = OpenSSL::X509::Name.new(cn)
      cert.subject = name
      cert.issuer = name
      cert.not_before = Time.now
      cert.not_after = Time.now + (365*24*60*60)
      cert.public_key = rsa.public_key

      ef = OpenSSL::X509::ExtensionFactory.new(nil,cert)
      ef.issuer_certificate = cert
      cert.extensions = [
        ef.create_extension("basicConstraints","CA:FALSE"),
        ef.create_extension("keyUsage", "keyEncipherment"),
        ef.create_extension("subjectKeyIdentifier", "hash"),
        ef.create_extension("extendedKeyUsage", "serverAuth"),
        ef.create_extension("nsComment", comment),
      ]
      aki = ef.create_extension("authorityKeyIdentifier",
                                "keyid:always,issuer:always")
      cert.add_extension(aki)
      cert.sign(rsa, OpenSSL::Digest::SHA1.new)

      return [ cert, rsa ]
    end
Creates a self-signed certificate with the given number of +bits+,
 the issuer +cn+ and a +comment+ to be stored in the certificate.