Messages in this thread | | | From | Stephan Müller <> | Subject | Re: [PATCH 0/6] Constant Time Memory Comparisons Are Important | Date | Sun, 11 Jun 2017 23:06:14 +0200 |
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Am Samstag, 10. Juni 2017, 04:59:06 CEST schrieb Jason A. Donenfeld:
Hi Jason,
> Whenever you're comparing two MACs, it's important to do this using > crypto_memneq instead of memcmp. With memcmp, you leak timing information, > which could then be used to iteratively forge a MAC. This is far too basic > of a mistake for us to have so pervasively in the year 2017, so let's begin > cleaning this stuff up. The following 6 locations were found with some > simple regex greps, but I'm sure more lurk below the surface. If you > maintain some code or know somebody who maintains some code that deals > with MACs, tell them to double check which comparison function they're > using.
Are you planning to send an update to your patch set? If yes, there is another one which should be converted too: crypto/rsa-pkcs1pad.c.
Otherwise, I will send a patch converting this one.
Thanks.
Ciao Stephan
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