module Gem::Security

def self.create_key(algorithm)
  if defined?(OpenSSL::PKey)
    case algorithm.downcase
    when "dsa"
      OpenSSL::PKey::DSA.new(RSA_DSA_KEY_LENGTH)
    when "rsa"
      OpenSSL::PKey::RSA.new(RSA_DSA_KEY_LENGTH)
    when "ec"
      OpenSSL::PKey::EC.generate(EC_NAME)
    else
      raise Gem::Security::Exception,
      "#{algorithm} algorithm not found. RSA, DSA, and EC algorithms are supported."
    end
  end
end