Class: CoderDecorator::Coders::Cipher

Inherits:
Coder
  • Object
show all
Defined in:
lib/coder_decorator/coders/cipher.rb

Overview

Encrypt the data into this format:

"#{encrypted_data}--#{initial_vector}"

Instance Attribute Summary

Attributes inherited from Coder

#coder

Instance Method Summary collapse

Constructor Details

#initialize(coder = nil, secret:, old_secret: nil, cipher: 'AES-256-CBC') ⇒ Cipher

Returns a new instance of Cipher.



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# File 'lib/coder_decorator/coders/cipher.rb', line 13

def initialize(coder = nil, secret:, old_secret: nil, cipher: 'AES-256-CBC')
  super(coder)
  @secret = secret
  @old_secret = old_secret
  @cipher = OpenSSL::Cipher.new(cipher)
end

Instance Method Details

#decode(data) ⇒ Object 



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# File 'lib/coder_decorator/coders/cipher.rb', line 28

def decode(data)
  secrets = [@old_secret, @secret]
  until secrets.empty?
    secret = secrets.pop
    begin
      encrypted_data, iv = data.split('--').map! { |v| v.unpack('m0').first }
      @cipher.decrypt
      @cipher.key = secret
      @cipher.iv  = iv
      return coder.decode(@cipher.update(encrypted_data) << @cipher.final)
    rescue StandardError
      secrets.empty? ? raise : next
    end
  end
end

#encode(obj) ⇒ Object 



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# File 'lib/coder_decorator/coders/cipher.rb', line 20

def encode(obj)
  @cipher.encrypt
  @cipher.key = @secret
  iv = @cipher.random_iv
  encrypted_data = @cipher.update(coder.encode(obj)) << @cipher.final
  "#{[encrypted_data].pack('m0')}--#{[iv].pack('m0')}"
end