# File lib/gssapi/simple.rb, line 217
    def unwrap_message(msg, encrypted = true)
      min_stat = FFI::MemoryPointer.new :OM_uint32
      in_buff = GSSAPI::LibGSSAPI::UnManagedGssBufferDesc.new
      in_buff.value = msg
      out_buff = GSSAPI::LibGSSAPI::ManagedGssBufferDesc.new
      conf_state = FFI::MemoryPointer.new :int
      conf_state.write_int((encrypted ? 1 : 0))
      q_op = FFI::MemoryPointer.new :OM_uint32
      q_op.write_int(0)
      maj_stat = GSSAPI::LibGSSAPI.gss_unwrap(min_stat, @context, in_buff.pointer, out_buff.pointer, conf_state, q_op)
      raise GssApiError.new(maj_stat, min_stat), "Failed to gss_unwrap message" if maj_stat != 0
      out_buff.value
    end