Hi there,

I have found examples of code used to compute the message digest for
data using HMAC-SHA. But I have not found code for the receiver end of
the processing where the receiver calculates its own digest and
compares it to the digest sent to it by the sender.

Are there open source examples for this receiver part aswell that I
can be pointed to?

I am programming in the fields for a security extension header of a
subnetwork data unit and want to use HMAC-SHA for the message
authentication calculation. I want the receiver to compare its
calculation to the calculation included in the packet by the sender
and then discard the packet and produce an error message if they dont
match.

I have quite limited programming skills so looking for existing open
source implementations I can try to use for this.

Many thanks!
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