- Mode: AES-CBC
- Case 1 (Pass): Encrypting 4KB data works correctly.
- Case 2 (Fail): Encrypting 64KB data causes the chip to crash/hang immediately when the AES service is executed.
- S32DS (S32 Design Studio) freezes during the execution of the AES service.
- Attempts to Attach to the S32K389 via the debugger fail completely.
- Are there any known limitations regarding the maximum data length per AES_ACCEL transaction?
Best Regards,
xianlong
Hi @wuxianlong
Let me check this. I will get back to you as soon as possible.
Regards,
Lukas
I'm sorry for delay, I have some issues with access rights to internal resources and it takes more time than expected to solve it. I will answer this as soon as possible. Thanks for your patience.
Regards,
Lukas
Hi @wuxianlong
There's following limitation for CMAC generate a verify services:
I'm still checking if there's a limitation also for encryption. I will let you know later.
Regards,
Lukas
Hi,@lukaszadrapa
Thank you very much for your explanation. It is probable that encryption and CMAC verification face the same limitations.
Best Regards,
xianlong
I got information that size limitation is 512KB - the size of LEN bit field is 19 bits.
Interesting thing is that the execution crashed completely. I would expect that AES_ACCEL just returns some error code in case of invalid parameters.
Isn't that caused by XRDC? Is XRDC enabled? Could you try to disable it for test purposes?
Regards,
Lukas
Hi,@lukaszadrapa
Testing with 64KB still fails. Enabling AEC error detection revealed the IP driver macro sets the limit to (1 << 19) - 1 bit < 64 KB.
Best Regards,
xianlong
