diff options
Diffstat (limited to 'firmware/2lib/2common.c')
| -rw-r--r-- | firmware/2lib/2common.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/firmware/2lib/2common.c b/firmware/2lib/2common.c index 4058a2f3..686aa002 100644 --- a/firmware/2lib/2common.c +++ b/firmware/2lib/2common.c @@ -11,6 +11,25 @@ #include "2rsa.h" #include "2sha.h" +int vb2_safe_memcmp(const void *s1, const void *s2, size_t size) +{ + const unsigned char *us1 = s1; + const unsigned char *us2 = s2; + int result = 0; + + if (0 == size) + return 0; + + /* + * Code snippet without data-dependent branch due to Nate Lawson + * (nate@root.org) of Root Labs. + */ + while (size--) + result |= *us1++ ^ *us2++; + + return result != 0; +} + int vb2_align(uint8_t **ptr, uint32_t *size, uint32_t align, uint32_t want_size) { uintptr_t p = (uintptr_t)*ptr; |