Class: Obfuskit::Obfuscator

Inherits:
Object
  • Object
show all
Defined in:
lib/obfuskit/obfuscator.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(salt) ⇒ Obfuscator

Initializes the obfuscator with a string. The string is converted to an array of bytes and stored in @c. The size of the array is stored in @l.



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# File 'lib/obfuskit/obfuscator.rb', line 13

def initialize(salt)
  @salt = salt || ""
  @salt_bytes = (salt.bytes || []) if salt.is_a? String
  @salt_length = @salt_bytes.size
end

Instance Attribute Details

#salt ⇒ Object (readonly)

Returns the value of attribute salt.



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# File 'lib/obfuskit/obfuscator.rb', line 8

def salt
  @salt
end

Instance Method Details

#obfuscate(value) ⇒ Object

Obfuscates a string. The string is converted to an array of bytes and each element is XORed with an element from @c. The index of the element from @c is the index of the element from the string modulo @l.



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# File 'lib/obfuskit/obfuscator.rb', line 22

def obfuscate(value)
  value.bytes.map.with_index { |b, i| b ^ @salt_bytes[i % @salt_length] }
end

#reveal(value) ⇒ Object

Reverses the obfuscation of an array of bytes. Each element is XORed with an element from @c and the result is converted back to a string. The index of the element from @c is the index of the element from the array modulo @l.



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# File 'lib/obfuskit/obfuscator.rb', line 29

def reveal(value)
  value.map.with_index { |b, i| b ^ @salt_bytes[i % @salt_length] }.pack('C*').force_encoding('utf-8')
end