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Re: New function: consttime_memcmp(3)
On Mon, 16 Mar 2015, Kamil Rytarowski wrote:
I'm attaching a patch against current adding a new libc and
kernel function: consttime_memcmp(3). The code is borrowed from
OpenBSD timingsafe_memcmp(3) .
I haven't looked at the code, but what use case do you have that
needs constant-time memcmp-like behaviour (with a three-state
return: negative, zero, or positive), as opposed to the behaviour
already provided by NetBSD's consttime_memequal(3) function (with
a two-state return: non-zero or zero).
I also have an implementation of consttime_memcmp(), but
I have found no use for it that cannot be satisfied by
--apb (Alan Barrett)
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