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CC3220SF: SHA256 checksum calculation

Jiri Saneistr
Expert 1002 points
Part Number: CC3220SF
Other Parts Discussed in Thread: SHA-256

Hello forum,

anybody maybe aware about some function(s) in TI SDK that could be used for SHA256 calculation?
I have no success finding any or looking wrong.

Thanks for possible help!

Regards Jiří

  • 0
    Guru 80245 points

    Hi Jiří,

    Please see this example. It is for SHA1, but after reconfiguration to SHAMD5_ALGO_SHA256 can be used to SHA-256 as well. Another option is to use TI-Drivers with CryptoCC32XX.h driver. Example of usage this driver you find at cryptohmac and local_ota examples.

    Jan

  • 0 in reply to Jan D
    Expert 1002 points

    Hello Jan,

    many thanks for your fast response. I have tried option 1 (this example) from you.
    Works perfectly.

    The said thing only is that input data length must be in multiply of 64 bytes.
    It is not documented, but ASSERT is observed.
    Could you maybe advice how to go around this limitation?
    I am using online SHA-256 hash calculator (https://xorbin.com/tools/sha256-hash-calculator).
    For the online calculator there is nothing like this needed.
    When I try to add some padding data it provides different SHA checksum (as expected).

    I have tried to play with "cryptohmac", but there is some key needed and I do not know
    how to define this key. For the online calculator above, there is nothing like this needed.

    I am sorry to bother with those questions. I have no clue what cryptography is about at all.

    Regards
    Jiří

  • 0 in reply to Jiri Saneistr
    Guru 80245 points

    Hi Jiří,

    I am not a expert to cryptography as well. But I think SHA256 hash is expecting padding - check this.

    Jan

  • 0 in reply to Jan D
    Expert 1002 points

    Hello Jan,
    many thanks, I could Google more before asking. :-)
    In any case, I consider the problem to be solved.

    Regards
    Jiří