Class: CcipherBox::EncryptionEngine

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

Overview

Meant to encrypt large data

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ EncryptionEngine

Returns a new instance of EncryptionEngine.



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

def initialize(*args)
  @keys = args
end

Instance Method Details

#final(&block) ⇒ Object 



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# File 'lib/ccipher_box/encryption_engine.rb', line 39

def final(&block)
  header = @cipher.encrypt_final

  st = BinStruct.instance.struct(:ccipherbox_cipher)
  st.keyConfig = @sk.encoded
 
  encBaseMat = []
  @keys.each do |k|
    #logger.debug "Encrypt with key #{k.name}"
    encBaseMat << k.encrypt(@baseMat)
  end
  st.baseMaterial = encBaseMat
  
  st.cipherConfig = header
  aheader = st.encoded

  @output.write(aheader)

  @intOut.rewind
  while not @intOut.eof?
    @output.write(@intOut.read)
  end

  @intOut.close
  @intOut.delete

  aheader
end

#init(output) ⇒ Object

Raises:



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# File 'lib/ccipher_box/encryption_engine.rb', line 15

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

  @output = output
  @baseMat = SecureRandom.random_bytes(256/8)
  @sk = CcipherFactory::SymKeyGenerator.derive(:aes, 256) do |ops|
    case ops
    when :password
      @baseMat
    end
  end

  @intOut = Tempfile.new

  @cipher = CcipherFactory::SymKeyCipher.encryptor
  @cipher.output(@intOut)
  @cipher.key = @sk
  @cipher.encrypt_init
end

#logger ⇒ Object 



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# File 'lib/ccipher_box/encryption_engine.rb', line 68

def logger
  if @logger.nil?
    @logger = TeLogger::Tlogger.new
    @logger.tag = :enc_eng
  end
  @logger
end

#update(data) ⇒ Object 



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# File 'lib/ccipher_box/encryption_engine.rb', line 35

def update(data)
  @cipher.encrypt_update(data) 
end