[openssl-users] AES CMAC with given iv

Stefan Grünwald stefan.g at gmx.at
Tue Oct 3 06:33:46 UTC 2017


I need to calculate an AES CMAC with a given iv and also get the new iv 
after the calculation.
On the internet I found some examples how to calculate the CMAC but if I 
read the code correctly it always starts with a zero iv.
I also found the CMAC_resume function which restores the iv but it also 
doesn't take the iv as an input parameter.
Is there any chance to set and get the iv?
The only way I would see at the moment is an ugly hack by setting the 
tbl field of the context struct in memory before calling CMAC_resume.


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