diff options
Diffstat (limited to 'firmware/2lib/2rsa.c')
| -rw-r--r-- | firmware/2lib/2rsa.c | 32 |
1 files changed, 0 insertions, 32 deletions
diff --git a/firmware/2lib/2rsa.c b/firmware/2lib/2rsa.c index 47ef1799..c4c9420a 100644 --- a/firmware/2lib/2rsa.c +++ b/firmware/2lib/2rsa.c @@ -139,38 +139,6 @@ static void modpowF4(const struct vb2_public_key *key, uint8_t *inout, } } -/** - * Safer memcmp() for use in crypto. - * - * Compares the buffers to see if they are equal. Time taken to perform - * the comparison is dependent only on the size, not the relationship of - * the match between the buffers. Note that unlike memcmp(), this only - * indicates inequality, not which buffer is lesser. - * - * @param s1 First buffer - * @param s2 Second buffer - * @param size Number of bytes to compare - * @return 0 if match or size=0, non-zero if at least one byte mismatched. - */ -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; -} - uint32_t vb2_rsa_sig_size(uint32_t algorithm) { switch (algorithm) { |