Hello,
I use a STSAFE-A110 chip on a own board based on STM32 MCU.
As I was unable to integrate the STSAFE library provided by ST on my specific fw, I wrote features whom I need as as echo, generate random, retrieve product data, generate host key, retrieve product data partition, read/update NVM.
All works fine but when I am unable to read a NVM zone with 'host' access condition. NVV zones with no specific AC are well read. Find below configuration of the NVM of my STSAFE chip.
+=======+================+==============+========+==============+========+==============+
| Zone | Data segment | Read AC | Read | Update AC | Update | One-way |
| index | length (bytes) | change right | AC | change right | AC | Counter |
+=======+================+==============+========+==============+========+==============+
| 0 | 1000 | False | always | True | never | False, 0 |
| 1 | 700 | True | always | True | always | False, 0 |
| 2 | 600 | False | host | True | always | False, 0 |
| 3 | 600 | True | always | True | always | False, 0 |
| 4 | 1696 | True | always | True | always | False, 0 |
| 5 | 64 | True | always | True | always | True, 499259 |
| 6 | 64 | True | always | True | always | True, 500000 |
| 7 | 1578 | True | host | True | always | False, 0 |
+-------+----------------+--------------+--------+--------------+--------+--------------+
Obviously, I put successfully the host MAC key and host cipher keys into the STSAFE-A110’s with PUT_ATTRIBUTE command by following 'Host secure channel setup use case' part in documentation. I used default keys provided in doc for my first tests.
host_key = { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF }
cipher_key = { 0x11, 0x11, 0x22, 0x22, 0x33, 0x33, 0x44, 0x44, 0x55, 0x55, 0x66, 0x66, 0x77, 0x77, 0x88, 0x88 }
+==========+==============+
| Host Key | Host CMAC |
| presence | seq. counter |
+==========+==============+
| True | 58 |
+----------+--------------+
When I want to read zone #7, by example, I send data below:
<Command (1 byte)><Zone index(2 bytes)><Offset (2 bytes)><Length (2 bytes)><C-MAC (4 bytes)><CRC (2 bytes)>
[8190.214] I2C write
[8190.214] A5 00 07 00 00 00 20 B5 BB E0 01 A9 CD |...... ...... |
But no data in response.
I don't understand what is my problem especially that got status in response seems to be good (0x00).
Is my CMAC wrong?
Do it exists a tool to check firstly my CMAC?
Someone could be help me to understand this?
