class Encrubto::RotN::Encryptor

Constants

ORIGINAL

Public Instance Methods

decrypt(encrypted, offset) click to toggle source
# File lib/encrubto/rotn/encryptor.rb, line 15
def decrypt(encrypted, offset)
  if encrypted.is_a?(String) && offset.is_a?(Integer)
    rotn = shift(offset % 26)
    encrypted.tr("#{ rotn }#{ rotn.to_s.upcase }", "#{ ORIGINAL }#{ ORIGINAL.upcase }")
  else
      raise 'First param must be String, second param must be Integer!'
  end
end
encrypt(str, offset) click to toggle source
# File lib/encrubto/rotn/encryptor.rb, line 6
def encrypt(str, offset)
  if str.is_a?(String) && offset.is_a?(Integer)
      rotn = shift(offset % 26)
      str.tr("#{ ORIGINAL }#{ ORIGINAL.upcase }", "#{ rotn }#{ rotn.to_s.upcase }")
  else
    raise 'First param must be String, second param must be Integer!'
  end
end
shift(offset) click to toggle source
# File lib/encrubto/rotn/encryptor.rb, line 24
def shift(offset)
  first_part = ORIGINAL[offset..ORIGINAL.length-1]
  second_part = ORIGINAL[0..offset-1]
  first_part.to_s + second_part.to_s
end