HMAC CLI (HMAC-SHA1 HMAC-MD5 HMAC-SHA256 HMAC-SHA512)

gistfile1.txt

#!/usr/bin/env ruby
# echo -n 'asdfasdf' |./hmacsha1 --key foobar'
# 60ff950bea9d6dc7018de881909057e4bba14e26
require 'openssl'
require 'optparse'

key = 'horriblekeychangeme'
algo = 'sha512'
verbose = false

OptionParser.new do |options|
  options.on("-a", "--algo ALGO",
             "Specify algorithm [md5, sha1, sha256, sha512]") do |ha|
    # XXX: unless algo in .. 
    algo = ha
  end
  options.on("-k", "--key KEY", "Specify HMAC Key") do |hk|
    key = hk
  end
  options.on("-v", "--verbose", "Extra output") do
    verbose = true
  end
end.parse!

data = ARGF.read

if verbose
  puts "algorithm is #{algo}"
  puts "key is #{key}"
  puts "data is #{data}"
end

puts OpenSSL::HMAC.digest(OpenSSL::Digest::Digest.new(algo), key, data).unpack("H*")