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Create a Signature or checksum

I want to create a function which will tell if me the last packet i got from the server is identical to the one i got now.
I thought about put in an array and just compare the two but it will be very inefficient.
So, a checksum or a signature implementation will ( i think ...) do the work.
But how do i make a checksum for let say a const char * data type?

Any help will be thankful!


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