Hashing example

hasher.rb

# we need access to the digest library for proper hashing
require 'digest'

# first we create the object that will do the hashing and store it in the hasher variable
hasher = Digest::SHA256.new

# next we ask for their password
puts "What's your password?"
password = gets.chomp

# we hash their password and store it in the hash variable
hash = hasher.digest(password)
# now we erase their password to show that all we need is the hash
password = ""

# next we ask them for their password again
puts "Remember your password?"
password = gets.chomp

# if the old hash and the new hash are the same, they've got the right password!
if hasher.digest(password) == hash
  puts "Yes, that's your password!"
else
  puts "Nope, you got it wrong!"
end