Class: Faceless::Authcode

Inherits:
Object
  • Object
show all
Defined in:
lib/faceless/authcode.rb

Constant Summary collapse

KEY_LENGTH = 
4

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(string, operation, expiry) ⇒ Authcode

Returns a new instance of Authcode.



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# File 'lib/faceless/authcode.rb', line 10

def initialize string, operation, expiry
  @string = string
  @operation = operation || ''
  @expiry = expiry || 0
end

Class Method Details

.decode(string, expiry = 0) ⇒ Object 



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# File 'lib/faceless/authcode.rb', line 20

def self.decode string, expiry = 0
  new(string, 'DECODE', expiry).authcode
end

.encode(string, expiry = 0) ⇒ Object 



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# File 'lib/faceless/authcode.rb', line 16

def self.encode string, expiry = 0
  new(string, 'ENCODE', expiry).authcode
end

Instance Method Details

#authcode ⇒ Object 



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# File 'lib/faceless/authcode.rb', line 24

def authcode
  key_length = generate_encrypt_key.size

  string = determine_string
  string_ords = ords(string)
  string_length = string_ords.size

  result = ''
  box = (0..255).to_a

  random_key = 0.upto(255).map do |i|
    (generate_encrypt_key[i % key_length]).ord
  end

  j = i = 0
  while i < 256 do
    j = (j + box[i] + random_key[i]) % 256
    box[i], box[j] = box[j], box[i]
    i += 1
  end

  a = j = i = 0
  while i < string_length
    a = (a + 1) % 256
    j = (j + box[a]) % 256
    box[a], box[j] = box[j], box[a]
    result += (string_ords[i] ^ (box[(box[a] + box[j]) % 256])).chr
    i += 1
  end

  return_result result
end