module AllegedRc4

Public Class Methods

to_alleged(message, key) click to toggle source

@param [String] message, key @param [String] key @return [String]

# File lib/allegedrc4.rb, line 7
def self.to_alleged(message, key)
  index1 = 0
  index2 = 0

  result = ''
  state = []
  (0..255).each do |i|
    state.push i
  end

  (0..255).each do |i|
    index2 = (key[index1].ord + state[i] + index2) % 256
    state[i], state[index2] = swap_val(state[i], state[index2])
    index1 = (index1 + 1) % key.length
  end

  x = 0
  y = 0
  (0..message.length - 1).each do |i|
    x = (x + 1) % 256
    y = (state[x] + y) % 256
    state[x], state[y] = swap_val(state[x], state[y])
    message_str = message[i].ord ^ state[(state[x] + state[y]) % 256]
    result += '-' + fill_zero(message_str.to_s(16))
  end
  result[1, result.length - 1].upcase
end

Private Class Methods

fill_zero(val) click to toggle source

@param [String] val @return [String]

# File lib/allegedrc4.rb, line 39
def self.fill_zero(val)
  return "0#{val}" if val.length == 1

  val
end

swap_val(value_for, value_to) click to toggle source

# File lib/allegedrc4.rb, line 45
def self.swap_val(value_for, value_to)
  [value_to, value_for]
end