Remove some unneccessary use of constant time code in curve448
@@ -64,7 +64,8 @@ static c448_error_t hash_init_with_dom(EVP_MD_CTX *hashctx, uint8_t prehashed,
if (context_len > UINT8_MAX)
return C448_FAILURE;
- dom[0] = 2 + word_is_zero(prehashed) + word_is_zero(for_prehash);
+ dom[0] = (uint8_t)(2 - (prehashed == 0 ? 1 : 0)
+ - (for_prehash == 0 ? 1 : 0));
dom[1] = (uint8_t)context_len;
if (!EVP_DigestInit_ex(hashctx, EVP_shake256(), NULL)
