require 'digest'

# Passwords are 7 lower case letters a-z
# Hash is SHA256

# Makes a password out of a hex hash
def makePW(hash, n=7)
  z = hash.to_i(16)
  pw = ""
  n.times{
    pw += (z % 26 + 'a'.ord).chr
    z/=26
  }
  return pw
end

#Random password (for starting a chain)
def randPass(n=7)
  Array.new(n){('a'.ord+rand(26)).chr}.join  
end

# Check, how many hashes per second/minute/hour can be computed
def speedTest(n=5)
  text = "a"*5
  n = 26**text.size
  start = Time.now
  n.times {
    Digest::SHA256.hexdigest(text)
    text.succ!
  }
  total = Time.now-start
  puts "#{n} Hashes in #{total} secs."
  puts "Makes #{(n/total).to_i} hashes/s"
  puts "Makes #{(n/total*60).to_i} hashes/min"
  puts "Makes #{(n/total*3600).to_i} hashes/h"
end