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Clarify comments in mbedtls_ct_memcpy_if

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-07-31 12:27:49 +01:00
parent fb1b851797
commit 07f853713d
1 changed files with 5 additions and 2 deletions
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7
library/constant_time.c
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@ -185,8 +185,11 @@ void mbedtls_ct_memcpy_if(mbedtls_ct_condition_t condition,
const uint32_t mask = (uint32_t) condition;
const uint32_t not_mask = (uint32_t) ~mbedtls_ct_compiler_opaque(condition);
/* If src2 is NULL and condition == 0, then this function has no effect.
* In this case, copy from dest back into dest. */
/* If src2 is NULL, setup src2 so that we read from the destination address.
*
* This means that if src2 == NULL && condition is false, the result will be a
* no-op because we read from dest and write the same data back into dest.
*/
if (src2 == NULL) {
src2 = dest;
}