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Prevent perf regressions in mbedtls_xor

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman
2022-12-30 21:32:03 +00:00
parent 051225d07a
commit b9cd19bc8c
3 changed files with 17 additions and 11 deletions
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6
library/common.h
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@ -122,11 +122,13 @@ static inline const unsigned char *mbedtls_buffer_offset_const(
*/
inline void mbedtls_xor(unsigned char *r, const unsigned char *a, const unsigned char *b, size_t n)
{
size_t i;
for (i = 0; (i + 4) <= n; i += 4) {
size_t i = 0;
#if defined(MBEDTLS_EFFICIENT_UNALIGNED_ACCESS)
for (; (i + 4) <= n; i += 4) {
uint32_t x = mbedtls_get_unaligned_uint32(a + i) ^ mbedtls_get_unaligned_uint32(b + i);
mbedtls_put_unaligned_uint32(r + i, x);
}
#endif
for (; i < n; i++) {
r[i] = a[i] ^ b[i];
}