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Don't let top go below zero!

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This commit is contained in:
Ben Laurie 2000-07-01 16:30:27 +00:00
parent 2bfb4dbce4
commit 69b5d3c51f
1 changed files with 1 additions and 1 deletions
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2
crypto/bn/bn_mont.c
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@ -90,7 +90,7 @@ int BN_mod_mul_montgomery(BIGNUM *r, BIGNUM *a, BIGNUM *b,
bn_wexpand(tmp2,a->top*4);
bn_sqr_recursive(tmp->d,a->d,a->top,tmp2->d);
tmp->top=a->top*2;
if (tmp->d[tmp->top-1] == 0)
if (tmp->top > 0 && tmp->d[tmp->top-1] == 0)
tmp->top--;
#else
if (!BN_sqr(tmp,a,ctx)) goto err;