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bn_exp.c: fix x86_64-specific crash with one-word modulus.

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PR: #3397
(cherry picked from commit eca441b2b4)
This commit is contained in:
Andy Polyakov 2014-07-02 19:35:50 +02:00
parent 88822622a1
commit 47b9e06cfd
1 changed files with 1 additions and 1 deletions
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2
crypto/bn/bn_exp.c
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@ -908,7 +908,7 @@ int BN_mod_exp_mont_consttime(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
/* 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,