TIMINGSAFE_BCMP(3) BSD Library Functions Manual TIMINGSAFE_BCMP(3)NAME
timingsafe_bcmp -- timing-safe byte sequence comparisons
SYNOPSIS
#include <string.h>
int
timingsafe_bcmp(const void *b1, const void *b2, size_t len);
DESCRIPTION
The timingsafe_bcmp() function compares the first len bytes pointed to by b1 and b2.
Additionally, the running time is independent of the byte sequences compared, making it safe to use for comparing secret values such as cryp-
tographic MACs. In contrast, bcmp(3) and memcmp(3) may short-circuit after finding the first differing byte.
RETURN VALUES
The timingsafe_bcmp() function returns 0 or not zero if the byte sequence pointed to by b1 compares equal to or not equal to (respectively)
the byte sequence pointed to by b2.
SEE ALSO bcmp(3)STANDARDS
The timingsafe_bcmp() function is a non-standard extension.
HISTORY
The timingsafe_bcmp() function first appeared in OpenBSD 4.9, FreeBSD 12.0, and macOS 10.12.1.
BSD August 15, 2016 BSD
Check Out this Related Man Page
BCMP(3) Linux Programmer's Manual BCMP(3)NAME
bcmp - compare byte sequences
SYNOPSIS
#include <strings.h>
int bcmp(const void *s1, const void *s2, size_t n);
DESCRIPTION
The bcmp() function compares the two byte sequences s1 and s2 of length n each. If they are equal, and in particular if n is zero, bcmp()
returns 0. Otherwise it returns a nonzero result.
RETURN VALUE
The bcmp() function returns 0 if the byte sequences are equal, otherwise a nonzero result is returned.
CONFORMING TO
4.3BSD. This function is deprecated (marked as LEGACY in POSIX.1-2001): use memcmp(3) in new programs. POSIX.1-2008 removes the specifi-
cation of bcmp().
SEE ALSO memcmp(3), strcasecmp(3), strcmp(3), strcoll(3), strncasecmp(3), strncmp(3)COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2008-08-06 BCMP(3)
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