diff options
Diffstat (limited to 'sys/lib')
| -rw-r--r-- | sys/lib/libkern/libkern.h | 3 | ||||
| -rw-r--r-- | sys/lib/libkern/timingsafe_bcmp.c | 33 |
2 files changed, 35 insertions, 1 deletions
diff --git a/sys/lib/libkern/libkern.h b/sys/lib/libkern/libkern.h index 36655eae4d7..6fd66719779 100644 --- a/sys/lib/libkern/libkern.h +++ b/sys/lib/libkern/libkern.h @@ -1,4 +1,4 @@ -/* $OpenBSD: libkern.h,v 1.26 2009/05/24 10:50:34 jsg Exp $ */ +/* $OpenBSD: libkern.h,v 1.27 2010/07/20 15:28:44 matthew Exp $ */ /* $NetBSD: libkern.h,v 1.7 1996/03/14 18:52:08 christos Exp $ */ /*- @@ -163,5 +163,6 @@ int strncasecmp(const char *, const char *, size_t); int getsn(char *, int); char *strchr(const char *, int); char *strrchr(const char *, int); +int timingsafe_bcmp(const void *, const void *, size_t); #endif /* __LIBKERN_H__ */ diff --git a/sys/lib/libkern/timingsafe_bcmp.c b/sys/lib/libkern/timingsafe_bcmp.c new file mode 100644 index 00000000000..8e25a2394de --- /dev/null +++ b/sys/lib/libkern/timingsafe_bcmp.c @@ -0,0 +1,33 @@ +/* $OpenBSD: timingsafe_bcmp.c,v 1.1 2010/07/20 15:28:44 matthew Exp $ */ +/* + * Copyright (c) 2010 Damien Miller. All rights reserved. + * + * 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. + */ + +#if !defined(_KERNEL) && !defined(_STANDALONE) +#include <string.h> +#else +#include <lib/libkern/libkern.h> +#endif + +int +timingsafe_bcmp(const void *b1, const void *b2, size_t n) +{ + const unsigned char *p1 = b1, *p2 = b2; + int ret = 0; + + for (; n > 0; n--) + ret |= *p1++ ^ *p2++; + return (ret != 0); +} |