Method: Themis::Ssession#unwrap

Defined in:

lib/rbthemis.rb

#unwrap(message) ⇒ Object

# File 'lib/rbthemis.rb', line 351

def unwrap(message)
  message_, message_length_ = string_to_pointer_size message
  unwrapped_message_length = FFI::MemoryPointer.new(:uint)

  res = secure_session_unwrap(
    @session, message_, message_length_, nil, unwrapped_message_length)
  return SUCCESS, '' if res == SUCCESS
  if res != BUFFER_TOO_SMALL
    raise ThemisError, "Secure Session failed decrypting: #{res}"
  end

  unwrapped_message = FFI::MemoryPointer.new(
    :char, unwrapped_message_length.read_uint)
  res = secure_session_unwrap(@session, message_, message_length_,
                              unwrapped_message, unwrapped_message_length)
  if res != SUCCESS && res != SEND_AS_IS
    raise ThemisError, "Secure Session failed decrypting: #{res}"
  end

  [res, unwrapped_message.get_bytes(0, unwrapped_message_length.read_uint)]
end