Re: [PATCH 0/6] Constant Time Memory Comparisons Are Important
From: Kees Cook <hidden>
Date: 2017-06-11 13:36:32
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keyrings, linux-bluetooth, linux-nfs, linux-wireless, lkml
On Sun, Jun 11, 2017 at 1:13 AM, Kalle Valo [off-list ref] wrote:
"Jason A. Donenfeld" [off-list ref] writes:quoted
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.Do you have any pointers where I could learn more about this?
While not using C specifically, this talks about the problem generally: https://www.chosenplaintext.ca/articles/beginners-guide-constant-time-cryptography.html -Kees -- Kees Cook Pixel Security -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html