Class: CcipherBox::DecryptionEngine

Inherits:
Object
  • Object
show all
Includes:
TR::CondUtils
Defined in:
lib/ccipher_box/decryption_engine.rb

Instance Method Summary collapse

Constructor Details

#initialize(vault) ⇒ DecryptionEngine

Returns a new instance of DecryptionEngine.



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# File 'lib/ccipher_box/decryption_engine.rb', line 7

def initialize(vault)
  @vault = vault
end

Instance Method Details

#final ⇒ Object 



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# File 'lib/ccipher_box/decryption_engine.rb', line 69

def final
  @dec.decrypt_final if not @dec.nil? 
end

#init(output) ⇒ Object

Raises:



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# File 'lib/ccipher_box/decryption_engine.rb', line 11

def init(output)
   
  raise CcipherBox::Error, "Output is mandatory" if output.nil?

  @output = output
  @intOut = MemBuf.new

end

#update(data) ⇒ Object 



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# File 'lib/ccipher_box/decryption_engine.rb', line 20

def update(data)
 
  if @dec.nil?
    @intOut.write(data)

    BinStruct.instance.find_struct(@intOut) do |meta, data|

      st = BinStruct.instance.struct_from_bin(meta)

      st.baseMaterial.each do |ebm|

        begin
          
          baseMat = @vault.decrypt(ebm)

          sk = CcipherFactory::SymKey.from_encoded(st.keyConfig) do |ops|
            case ops
            when :password
              baseMat
            end
          end

          @dec = CcipherFactory::SymKeyCipher.decryptor
          @dec.output(@output)
          @dec.key = sk
          @dec.decrypt_init

          @dec.decrypt_update_meta(st.cipherConfig)

          @dec.decrypt_update_cipher(data) if not_empty?(data)

          break

        rescue KeyNotRegistered
          # retry with next key
        end

      end

      raise KeyNotRegistered, "Cannot find any loaded key decrypt this data" if @dec.nil?

    end

  else
    @dec.decrypt_update_cipher(data)
  end

end