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bn_exp.c: fix corner case in new constant-time code.

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Submitted by: Emilia Kasper
This commit is contained in:
Andy Polyakov 2011-10-29 19:25:13 +00:00
parent b08259cdfe
commit 0933887112
1 changed files with 5 additions and 0 deletions
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5
crypto/bn/bn_exp.c
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@ -693,6 +693,11 @@ int BN_mod_exp_mont_consttime(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
BN_ULONG *np=mont->N.d, *n0=mont->n0;
/* BN_to_montgomery can contaminate words above .top
* [in BN_DEBUG[_DEBUG] build]... */
for (i=am.top; i<top; i++) am.d[i]=0;
for (i=tmp.top; i<top; i++) tmp.d[i]=0;
bn_scatter5(tmp.d,top,powerbuf,0);
bn_scatter5(am.d,am.top,powerbuf,1);
bn_mul_mont(tmp.d,am.d,am.d,np,n0,top);