* RSAZ exponentiation. For further information see
* crypto/bn/rsaz_exp.c and accompanying assembly modules.
*/
- if (((OPENSSL_ia32cap_P[2]&0x80100) != 0x80100) /* check for MULX/AD*X */
- && (16 == a->top) && (16 == p->top) && (BN_num_bits(m) == 1024)
+ if ((16 == a->top) && (16 == p->top) && (BN_num_bits(m) == 1024)
&& rsaz_avx2_eligible())
{
if (NULL == bn_wexpand(rr, 16)) goto err;
/* Dedicated window==4 case improves 512-bit RSA sign by ~15%, but as
* 512-bit RSA is hardly relevant, we omit it to spare size... */
- if (window==5)
+ if (window==5 && top>1)
{
void bn_mul_mont_gather5(BN_ULONG *rp,const BN_ULONG *ap,
const void *table,const BN_ULONG *np,
bits = BN_num_bits(p);
if (bits == 0)
{
- ret = BN_one(rr);
+ /* x**0 mod 1 is still zero. */
+ if (BN_is_one(m))
+ {
+ ret = 1;
+ BN_zero(rr);
+ }
+ else
+ ret = BN_one(rr);
return ret;
}
if (a == 0)