flashauthorityid algoritm?

[oloo]

I downloaded "Flash_authority_id" algoritm by zulea. I think it is memory dump from wintesla. I tryed recompile that...but its not so easy......
Anybody know wheres FlashAuthorityID is placed in eeprom?

Mayby someone tryed do the same?......recompiled FAID i mean.....

[||Joe]

Hi all,

I think it is a faked routine, I don't have the right routine but from the dejan 1.04 source he calculate the flahs authoroity as follows:
- The flash check sum is not for the full flash, it is for the MCU+PPM only.
- It is for some bytes of that part only. Bytes included in the check sum are two bytes from every 32 bytes read in a 64 byte block size.
---------start of the flash----
.
.
--------at offset 64 begin calculations-------
____first 64 block____
==first 32 bytes==
include the first 2 bytes in calculateions
==2nd 32 bytes==
include the first 2 bytes in calculateions
____end of the first block_____
____2nd 64 block_____
as above
____end of 2nd block___

and so on till the end of the MCU+PPM part of the full flash file.

I think a company like Nokia must use a standard authority ID algorithm like MD2 through MD5 or other famous techniques.

Please any one have the Dejan Box try to contact me urgently and I think we can get the algorithm or just get the checksums required of all MCU+PPM packages so any one can upgrade easily.

[oloo]

it is not fake algorithm because i have DLL library with that. And it is part of Wintesla.
i think, to change PPM +MCU we need:
- full flash
- calculate FAID
- write calculated FAID to eeprom
- calculate new eeprom CRC
- write new eeprom CRC to eeprom

Zulea said, for calculate FAID we nned 13 bytes MSID and flash crc.....flasch crc it is 2 bytes so 13+2 it is 15........and FLS1GETAUTHORITYID has 14 bytes arguments.....1 byte less
what do you think about that?