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Make sure randomness is not correlated between modules

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redfast00 2022-01-24 22:50:13 +01:00
parent 4e659377df
commit 82d75d40f7
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GPG key ID: 5946E0E34FD0553C
1 changed files with 7 additions and 2 deletions
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9
lib/obus_module.cpp
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@ -166,9 +166,14 @@ bool loopPuzzle(obus_can::message* message, void (*callback_game_start)(uint8_t
callback_state(message->gamestatus.time_left, message->gamestatus.strikes, message->gamestatus.max_strikes, message->gamestatus.puzzle_modules_left);
break;
case OBUS_MSGTYPE_C_INFOSTART:
// randomSeed has no effect when called with 0 as seed, so we use
// Add module type and id to seed, to remove correlation in randomness between modules
uinst32_t seed = message->infostart.seed + ((uint32_t) this_module.type << 8) + ((uint32_t) this_module.id);
// randomSeed has no effect when called with 0 as seed, so we use
// a fallback value that is unlikely to collide with other frequently used seeds
randomSeed(message->infostart.seed ? message->infostart.seed : 0xFFFFFFFF);
if (seed == 0) {
seed--;
}
randomSeed(seed);
break;
default:
break;