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-.\"	$OpenBSD: timingsafe_bcmp.3,v 1.2 2014/06/21 20:22:15 tedu Exp $
-.\"
-.\" Copyright (c) 2014 Google Inc.
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.\" $FreeBSD$
-.Dd August 15, 2016
-.Dt TIMINGSAFE_BCMP 3
-.Os
-.Sh NAME
-.Nm timingsafe_bcmp
-.Nd timing-safe byte sequence comparisons
-.Sh SYNOPSIS
-.In string.h
-.Ft int
-.Fn timingsafe_bcmp "const void *b1" "const void *b2" "size_t len"
-.Sh DESCRIPTION
-The
-.Fn timingsafe_bcmp
-function compares the first
-.Fa len
-bytes pointed to by
-.Fa b1
-and
-.Fa b2 .
-.Pp
-Additionally, the running time is independent of the byte sequences compared,
-making it safe to use for comparing secret values such as cryptographic MACs.
-In contrast,
-.Xr bcmp 3
-and
-.Xr memcmp 3
-may short-circuit after finding the first differing byte.
-.Sh RETURN VALUES
-The
-.Fn timingsafe_bcmp
-function returns 0 or not zero if the byte sequence pointed to by
-.Fa b1
-compares equal to or not equal to (respectively)
-the byte sequence pointed to by
-.Fa b2 .
-.Sh SEE ALSO
-.Xr bcmp 3
-.Sh STANDARDS
-The
-.Fn timingsafe_bcmp
-function is a non-standard extension.
-.Sh HISTORY
-The
-.Fn timingsafe_bcmp
-function first appeared in
-.Ox 4.9 ,
-.Fx 12.0 ,
-and macOS 10.12.1.