Hi Pascal, Le 23/05/2019 à 23:43, Pascal Van Leeuwen a écrit :
-----Original Message----- From: Eric Biggers [mailto:ebiggers@xxxxxxxxxx]
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Note that it's not necessary that your *hardware* supports empty messages, since you can simply do this in the driver instead: if (req->cryptlen == 0) return 0;For skciphers, yes, it's not such a problem. Neither for basic hash. (And thanks for the code suggestion BTW, this will be a lot more efficient then what I'm doing now for this particular case :-) For HMAC, however, where you would have to return a value depending on the key ... not so easy to solve. I don't have a solution for that yet :-(
I had the same issue when porting the SEC2 Talitos driver to also support SEC1. See following commit to see the way it has been fixed:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2d02905ebd22c0271a25e424ab209c8b7067be67 Christophe
And I'm pretty sure this affects all Inside Secure HW drivers in the tree: inside-secure, amcc, mediatek and omap ... Regards, Pascal van Leeuwen Silicon IP Architect, Multi-Protocol Engines, Inside Secure www.insidesecure.com
