Method: Ccrypto::Ruby::CipherEngine#initialize

Defined in:
lib/ccrypto/ruby/engines/cipher_engine.rb

#initialize(*args, &block) ⇒ CipherEngine

Returns a new instance of CipherEngine.



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# File 'lib/ccrypto/ruby/engines/cipher_engine.rb', line 61

def initialize(*args, &block)
  @spec = args.first

  #teLogger = TteLogger.new
  teLogger.debug "Cipher spec : #{@spec}"

  begin
    case @spec
    #when String
    #  @cipher = OpenSSL::Cipher.new(@spec)
    when Ccrypto::CipherEngineConfig
      @cipher = OpenSSL::Cipher.new(@spec.provider_config)
    when Ccrypto::DirectCipherConfig
      @cipher = OpenSSL::Cipher.new(self.class.to_openssl_spec(@spec))
    else
      raise Ccrypto::CipherEngineException, "Not supported cipher init type #{@spec.class}"
    end
  rescue OpenSSL::Cipher::CipherError, RuntimeError => ex
    raise Ccrypto::CipherEngineException, ex
  end

  case @spec.cipherOps
  when :encrypt, :enc
    teLogger.debug "Operation encrypt"
    @cipher.encrypt
  when :decrypt, :dec
    teLogger.debug "Operation decrypt"
    @cipher.decrypt
  else
    raise Ccrypto::CipherEngineException, "Cipher operation (encrypt/decrypt) must be given"
  end


  if @spec.has_iv?
    teLogger.debug "IV from spec"
    @cipher.iv = @spec.iv
    teLogger.debug "IV : #{to_hex(@spec.iv)}"
  else
    teLogger.debug "Generate random IV"
    @spec.iv = @cipher.random_iv
    teLogger.debug "IV : #{to_hex(@spec.iv)}"
  end


  if @spec.has_key?
    teLogger.debug "Key from spec"
    case @spec.key
    when Ccrypto::SecretKey
      @cipher.key = @spec.key.to_bin
    when String
      @cipher.key = @spec.key
    else
      raise Ccrypto::CipherEngineException, "Unknown key type for processing #{@spec.key}"
    end
  else
    teLogger.debug "Generate random Key"
    @spec.key = @cipher.random_key
  end


  if @spec.is_mode?(:gcm)

    if not_empty?(@spec.auth_data) 
      teLogger.debug "Setting auth data"
      @cipher.auth_data = @spec.auth_data
    end

    if not_empty?(@spec.auth_tag) 
      raise CipherEngineException, "Tag length of 16 bytes is expected" if @spec.auth_tag.bytesize != 16
      teLogger.debug "Setting auth tag"
      @cipher.auth_tag = @spec.auth_tag
    end

  end

end