Ruby HMAC verifier

exabrial (Jon) — Sun, 05 Nov 2006 01:54:20 GMT

// Ruby script to verify the HMAC of a file or string.



#!/usr/bin/env ruby

#

#  Created by Jon (exabrial+hmacruby@gmail.com) on 2006-11-04.

#  Copyright (c) 2006. All rights reserved.

#  Released under MIT License



require 'openssl'

require "getopt/std"

include OpenSSL

include Digest



def printhelp

  help=<Purpose: Provides HMAC-SHA1 of a file or string. Text passwords are SHA1 hashed.

Usage: hmac.rb ["string to digest"] [-f (pathtofile)] [-k (pathtokeyfile)]

Options:

  -f (pathtofile) digests a file instead of a string

  -k (pathtokeyfile) does not prompt for key and uses the specified file as a key instead.

end

  puts help

  exit

end



if ARGV.size < 1

  printhelp

elsif ARGV.size==1

  @plaintext=ARGV.shift

else

  begin

    opt = Getopt::Std.getopts("f:k:")

  rescue Getopt::StdError

    printhelp

  end

  

  if opt["f"]

    @plaintext=File.read(opt["f"])

  end

  if opt["k"]

    @key=File.read(opt["k"])

  end

  

  printhelp if (!@plaintext&&!@key)

end



def getkey

  return @key if @key

  print "Please type your key then push enter:"

  return SHA1.new(gets()).to_s

end



def main

  hmacd=HMAC.new(getkey(), SHA1.new)

  hmacd.update(@plaintext)

  puts hmacd.to_s

end



main

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Ruby HMAC verifier