openssl_perf.rb

require "openssl"
require "securerandom"
require "benchmark/ips"

class Signer
  def initialize
    @rsa_key = OpenSSL::PKey::RSA.new(2048)
  end

  def sign(string_to_sign)
    key = OpenSSL::PKey::RSA.new(@rsa_key)
    digest = OpenSSL::Digest::SHA256.new
    return key.sign(digest, string_to_sign)
  end

  def new_sign(string_to_sign)
    key = @rsa_key
    key = OpenSSL::PKey::RSA.new(@rsa_key) unless key.respond_to?(:sign)
    digest = OpenSSL::Digest::SHA256.new
    return key.sign(digest, string_to_sign)
  end
end


signer = Signer.new
string_to_sign = SecureRandom.hex(50)

Benchmark.ips do |x|
  # Typical mode, runs the block as many times as it can
  x.report("sign") { signer.sign(string_to_sign) }
  x.report("new") { signer.new_sign(string_to_sign) }
  x.compare!
end