bn2binpad: Use memset as the buffer will be used later
Apparently using OPENSSL_cleanse() confuses the fuzzer so it
makes the buffer to appear uninitialized. And memset can be
safely used here and it is also potentially faster.
Fixes
@@ -505,7 +505,8 @@ int bn2binpad(const BIGNUM *a, unsigned char *to, int tolen, endianess_t endiane
/* Swipe through whole available data and don't give away padded zero. */
atop = a->dmax * BN_BYTES;
if (atop == 0) {
- OPENSSL_cleanse(to, tolen);
+ if (tolen != 0)
+ memset(to, '\0', tolen);
return tolen;
}
