row_encryption.rb

# row_encrypt.rb

# declare variables
  input = ""
  key = ""
  cipher = ""

# get the user input
# prompt for key
  print "Please Enter the key you wish to use: \n"
  key = gets.chomp

    no_spaces_key = key.gsub(/\s+/, "") # remove whitespace by substitution
      key_chars = no_spaces_key.split(//) # split into individual characters

# prompt for message
  print "Please Enter the text you wish to encrypt: \n"
  input = gets.chomp

  no_spaces_message = input.gsub(/\s+/, "") # remove whitespace by substitution
    message_chars = no_spaces_message.split(//) # split into individual characters

# define constants
  KEYLENGTH = key_chars.length
  MSGLENGTH = message_chars.length

# make sure we form an n x n matrix
  if message_chars.length % key_chars.length != 0
    # add x's until it's square
      message_chars.push("x")
  end

   def encrypt(input_array)

     p = 0
     k = 0

     temp = Array.new(KEYLENGTH) { Array.new(KEYLENGTH) }

     for i in 0..input_array.length do 

       print input_array[i]

       temp[p][k].map(input_array[i])
       p = 0 if p == ((KEYLENGTH) -1)
       k = k + 1 if p == ((KEYLENGTH) - 1)
       p++ if p != ((KEYLENGTH)-1)

       end # end if block
     end # end for loop
  end # end encrypt method

encrypt(message_chars)
print message_chars