Hello Team,
I am trying to use PKTE peripheral to calculate SHA hash, however I want to calculate it iteratively. eg 128 words. I want it to calculate in iteration of 64 words.
Could you please share me any example using PKTE peripheral which calculates hash in intermediate steps. The currrent example, just calculates the hash over entire buffer length.
Specifically, how to modify these variables in SHA calculations.
Thank you,
Regards
Hello santha.vijay
Do you have details about this HASHSRC
All the examples use value 3. Can you please guide me how to use the options 0 and 2?
1. How does the byte count impact the calculations?
2. More detail on both these mode.
Thank you
Hi Newton,
Apologies for the delay in response. Please find the attached code (ADSP-SC594) where we were able to implement the block-based Hash protocol using Crypto Driver.
This will require one change in crypto driver. Details below:
Since this is assuming block-based operation, the intermediate digest needs to be picked up from the previous operation. This was getting zero initialized by the crypto API. By commenting it, we can preserve the settings in the PKTE register and use that for next operation.
Please make these changes in the crypto driver locally by making it a part of the project itself. We have also attached the modified file, based on CCES 2.11.1.
HASHSRC refers to the initial state of the Hash functions which is often non-zero. So as per register description, the HASH SRC can be chosen to be passed from SA records, or State registers or it can be algorithm specific which will be loaded on its own.
Hope this helps.
Best Regards,
Santhakumari.K
