timingsafe_bcmp.c File Reference
#include "safe_str_lib.h"
Include dependency graph for timingsafe_bcmp.c:
Functions | |
| EXPORT int | timingsafe_bcmp (const void *b1, const void *b2, size_t n) |
| Compare all memory bytes. More... | |
Function Documentation
◆ timingsafe_bcmp()
| EXPORT int timingsafe_bcmp | ( | const void * | b1, |
| const void * | b2, | ||
| size_t | n | ||
| ) |
Compare all memory bytes.
Return 0 or not zero.
The running time is independent of the byte sequences compared, making them safe to use for comparing secret values such as cryptographic MACs. In contrast, bcmp(3) and memcmp(3) may short-circuit after finding the first differing byte.
- Remarks
- from OpenBSD
- Parameters
-
b1 pointer to memory to compare against b2 pointer to the source memory to compare with b1 n number of bytes to compare in both buffers
- Precondition
- Neither b1 nor b2 shall be a null pointer.
- Return values
-
0 if the buffers are equal, or not zero if they are not equal.
- See also
- memcmp_s(), timingsafe_memcmp()