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Commit 11598dec authored by Erwin Jansen's avatar Erwin Jansen
Browse files

Use mersenne twister for random values. 

We now use the 64 bit mersenne twister algorithm to generate 64 bit
random values.

The main advantage is that this is C++11 compatible and will work under
msvc as well.

Bug: 186567864
Change-Id: I0f7013a641d7dc211ef7e4eb4f042b4235116fc4
Test: Launch rootcanal, see gDevice beacon show up
parent 5031896e

system/vendor_libs/test_vendor_lib/model/controller/dual_mode_controller.cc

+7 −4
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
#include "dual_mode_controller.h"



#include <memory>

#include <random>



#include <base/files/file_util.h>

#include <base/json/json_reader.h>
@@ -2240,14 +2241,16 @@ void DualModeController::LeReadRemoteFeatures(CommandView command) { 
  send_event_(std::move(packet));

}





static std::random_device rd{};

static std::mt19937_64 s_mt{rd()};



void DualModeController::LeRand(CommandView command) {

  auto command_view = gd_hci::LeRandView::Create(

      gd_hci::LeSecurityCommandView::Create(command));

  ASSERT(command_view.IsValid());

  uint64_t random_val = 0;

  for (size_t rand_bytes = 0; rand_bytes < sizeof(uint64_t); rand_bytes += sizeof(RAND_MAX)) {

    random_val = (random_val << (8 * sizeof(RAND_MAX))) | random();

  }



  uint64_t random_val = s_mt();



  auto packet = bluetooth::hci::LeRandCompleteBuilder::Create(

      kNumCommandPackets, ErrorCode::SUCCESS, random_val);