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The following commit(s) were added to refs/heads/master by this push:
new 1a5351edac libc:add timingsafe_bcmp to libc
1a5351edac is described below
commit 1a5351edaccc14e75c317481e14d843990db342d
Author: anjiahao <anjia...@xiaomi.com>
AuthorDate: Sat Aug 27 12:22:29 2022 +0800
libc:add timingsafe_bcmp to libc
Signed-off-by: anjiahao <anjia...@xiaomi.com>
---
include/string.h | 1 +
libs/libc/string/Make.defs | 2 +-
libs/libc/string/lib_timingsafe_bcmp.c | 43 ++++++++++++++++++++++++++++++++++
3 files changed, 45 insertions(+), 1 deletion(-)
diff --git a/include/string.h b/include/string.h
index 8d82b6b7a0..7e449fe6ed 100644
--- a/include/string.h
+++ b/include/string.h
@@ -93,6 +93,7 @@ FAR void *memmem(FAR const void *haystack, size_t
haystacklen,
FAR const void *needle, size_t needlelen);
void explicit_bzero(FAR void *s, size_t n);
+int timingsafe_bcmp(FAR const void *b1, FAR const void *b2, size_t n);
#undef EXTERN
#if defined(__cplusplus)
diff --git a/libs/libc/string/Make.defs b/libs/libc/string/Make.defs
index 6284d1fe74..1208246e97 100644
--- a/libs/libc/string/Make.defs
+++ b/libs/libc/string/Make.defs
@@ -29,7 +29,7 @@ CSRCS += lib_strerror.c lib_strncasecmp.c lib_strncat.c
lib_strncmp.c
CSRCS += lib_strndup.c lib_strcasestr.c lib_strpbrk.c lib_strrchr.c
CSRCS += lib_strspn.c lib_strstr.c lib_strtok.c lib_strtokr.c
CSRCS += lib_strsep.c lib_strerrorr.c lib_explicit_bzero.c lib_strsignal.c
-CSRCS += lib_index.c lib_rindex.c
+CSRCS += lib_index.c lib_rindex.c lib_timingsafe_bcmp.c
ifneq ($(CONFIG_LIBC_ARCH_MEMCHR),y)
CSRCS += lib_memchr.c
diff --git a/libs/libc/string/lib_timingsafe_bcmp.c
b/libs/libc/string/lib_timingsafe_bcmp.c
new file mode 100644
index 0000000000..8473b61249
--- /dev/null
+++ b/libs/libc/string/lib_timingsafe_bcmp.c
@@ -0,0 +1,43 @@
+/****************************************************************************
+ * libs/libc/string/lib_timingsafe_bcmp.c
+ * $OpenBSD: timingsafe_bcmp.c,v 1.3 2015/08/31 02:53:57 guenther 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <string.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+int timingsafe_bcmp(FAR const void *b1, FAR const void *b2, size_t n)
+{
+ FAR const unsigned char *p1 = b1;
+ FAR const unsigned char *p2 = b2;
+ int ret = 0;
+
+ for (; n > 0; n--)
+ {
+ ret |= *p1++ ^ *p2++;
+ }
+
+ return (ret != 0);
+}
