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TMS320F280039C: Calculate CMAC

Alice
Prodigy 215 points
Part Number: TMS320F280039C
Other Parts Discussed in Thread: C2000WARE

Tool/software:

1. I want to calculate CMAC of application which include other information by script , and authentic this application in bootloader by API function: CPU1BROM_calculateCMAC().

Can I call Hex utility in my script? Or can I call the AES_CMAC Algorithm write by TI?

2. I find aes_cmac example in C2000, the function include AES_performCMAC() and AES_performCMACFast(). 

What is the difference of these two functions? Which function is used when execute CPU1BROM_calculateCMAC()?

  • 0
    TI__Expert 5400 points

    Hi,

    The aes_cmac example in the C2000WARE demonstrates the usage of CMAC algorithm for authentication using a test vector on how the data supposed to be fed into the AES engine. If your intention is to authenticate your image via bootloader, you could call the CPU1BROM_calculateCMAC() directly from the application as well directly. This API is available. 

    Thanks & Regards

    Pramod 

  • 0 in reply to Pramod P
    Prodigy 215 points

    Hello,

    Now, I have use the API CPU1BROM_calculateCMAC() in bootloader to authentic my application image, and the application image is generated by Hex utility, which will caculate the Golden CMAC Tag.

    But I want generate the application image by script, so I want call some function in my script to caculate the CMAC Tag. Then  use API CPU1BROM_calculateCMAC() in bootloader and authentic my application image.

    Which function can I called?

  • 0 in reply to Alice
    TI__Expert 5400 points

    Hi ,

    I believe what you are looking for is a SW based solution which can mimic the CMAC authentication to generate a Tag out. Unfortunately, we don't have this support in our library. Please correct me if my understanding is correct. 

    Thanks & Regards

    Pramod