gistfile1.rb

#!/usr/bin/env ruby

require 'securerandom'
require 'bitcoin'
require 'digest'

LIST              = './wordlist.txt'
ROLLS_PER_WORD    = 5
DICE_FACES        = 6
WORDS_PER_PHRASE  = 12

def roll
  (SecureRandom.random_number * 6).ceil
end

def passphrase_to_brainwallet(passphrase)

  # TODO : Check key for acceptable range
  k = Bitcoin::Key.new(Digest::SHA2.hexdigest(passphrase))
  bwallet = <<-EOS
    Passphrase:        #{passphrase}
    Private key (hex): #{k.priv}
    Private key (b58): #{k.to_base58}
    Address:           #{k.addr}  
  EOS

    puts bwallet.gsub(/^\s*/, '')
end

passphrase_to_brainwallet(ARGV.join(' '))