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}"

Constant Summary

Constants inherited from Coder

CoderDecorator::Coders::Coder::DELEGATE

Instance Method Summary collapse

Methods inherited from Coder

#coder

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)
  @base64 = Coders::Base64.new
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class CoderDecorator::Coders::Coder

Instance Method Details

#decode(str) ⇒ Object

Raises:



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# File 'lib/coder_decorator/coders/cipher.rb', line 30

def decode(str)
  [@secret, @old_secret].each do |secret|
    begin
      return decrypt(secret, str)
    rescue ::OpenSSL::Cipher::CipherError, ::TypeError
      next
    end
  end
  raise InvalidEncoding
end

#encode(obj) ⇒ Object 



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# File 'lib/coder_decorator/coders/cipher.rb', line 21

def encode(obj)
  @cipher.encrypt
  @cipher.key = @secret
  iv = @cipher.random_iv
  encrypted_data = @cipher.update(coder.encode(obj)) << @cipher.final
  blob = "#{@base64.encode(encrypted_data)}--#{@base64.encode(iv)}"
  @base64.encode(blob)
end