Bug on seed and key internal code generator

[mauro-ongaro]

In the Diagnostic using this code for the seed & key with the built in generator (not using a dll) TSMaster returns [67 45 23 01] instead of [01 23 45 67].

u32 ROOT_KEY_1 = 0x01234567;
u32 localKey = 0;
localKey = (ROOT_KEY_1);
*AKey = localKey;
return 0;

Checked both on the internal Seed&Key Tester and on the CAN bus ( sends 27 02 67 45 23 01 instead 27 02 01 23 45 67).

Also using:

u32 ROOT_KEY_1 = 0x01234567;
u32 localKey = 0;
localKey = (0xFFFFFFFF * ROOT_KEY_1); // result 0x01234566FEDCBA99
*AKey = localKey;
return 0;

TSMasted returns [99 BA DC FE] instead of [FE DC BA 99]

Using this code with ASeed = 0x0123456, returns correctly 0x01234567.

*AKey = ASeed;
return 0;

I am using TSMaster V2025.5.21.1443.

[ColinGong123]

Hi，thank you for your good question.
for the seedkey code type, it need to do the reverse processing for seed and key.

maybe you can try the example below.

u32 i,key = 0;
u32 localKey= 0;

// seed Reverse processing
for(i = 0; i< 4;i++)
{
localKey += ((u8)ASeed) << (8*(3-i));
ASeed >>= 8;
}
// end seed Reverse processing

//u32 ROOT_KEY_1 = 0x01234567;
//u32 localKey = 0;
//localKey = (ROOT_KEY_1);
key = localKey;

//key Reverse processing
*AKey = 0;
for(i = 0; i< 4;i++)
{
AKey += ((u8)key) << (8(3-i));
key >>= 8;
}
//end key Reverse processing

return 0;

[mauro-ongaro]

I tried but the problem seems not to be in the I/O interface but in the internal calculations. With this code:

u32 localKey = 0;
localKey = (ASeed + 0x00000001);
*AKey = localKey;
return 0;

With ASeed=5F 60 71 32 it returns 60 60 71 32 instead of 5F 60 71 33.

And this code with ASeed=00 00 00 01 returns 00 00 00 AA instead of AA AA AA AA.

u32 localKey = 0;
localKey = (ASeed * 0xAAAAAAAA);
*AKey = localKey;
return 0;

Then the issue seems to be in the internal calculation (maybe a big/little endian issue).