require 'digest.so' module Digest autoload "SHA256", "digest/sha2" autoload "SHA384", "digest/sha2" autoload "SHA512", "digest/sha2" def self.const_missing(name) begin require File.join('digest', name.downcase) return Digest.const_get(name) if Digest.const_defined?(name) rescue LoadError => e end raise NameError, "Digest class not found: Digest::#{name}" end class Base # creates a digest object and read given file, _name_. # # p Digest::SHA256.file("X11R6.8.2-src.tar.bz2").hexdigest # # => "f02e3c85572dc9ad7cb77c2a638e3be24cc1b5bea9fdbb0b0299c9668475c534" def self.file(name) digest = self.new File.open(name, "rb") {|f| buf = "" while f.read(16384, buf) digest.update buf end } digest end end end def Digest(name) Digest.const_get(name) end