generate_secret_with_openssl

# File railties/lib/rails_generator/secret_key_generator.rb, line 67
    def generate_secret_with_openssl
      require 'openssl'
      if !File.exist?("/dev/urandom")
        # OpenSSL transparently seeds the random number generator with
        # data from /dev/urandom. On platforms where that is not
        # available, such as Windows, we have to provide OpenSSL with
        # our own seed. Unfortunately there's no way to provide a
        # secure seed without OS support, so we'll have to do with
        # rand() and Time.now.usec().
        OpenSSL::Random.seed(rand(0).to_s + Time.now.usec.to_s)
      end
      data = OpenSSL::BN.rand(2048, -1, false).to_s

      if OpenSSL::OPENSSL_VERSION_NUMBER > 0x00908000
        OpenSSL::Digest::SHA512.new(data).hexdigest
      else
        generate_secret_with_prng
      end
    end