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bugfix: 0 - w (w != 0) is actually negative

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This commit is contained in:
Nils Larsch 2005-07-17 16:08:21 +00:00
parent 4913b88f70
commit 3c6ab9aad9
1 changed files with 7 additions and 1 deletions
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8
crypto/bn/bn_word.c
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@ -175,7 +175,13 @@ int BN_sub_word(BIGNUM *a, BN_ULONG w)
/* degenerate case: w is zero */
if (!w) return 1;
/* degenerate case: a is zero */
if(BN_is_zero(a)) return BN_set_word(a,w);
if(BN_is_zero(a))
{
i = BN_set_word(a,w);
if (i != 0)
BN_set_negative(a, 1);
return i;
}
/* handle 'a' when negative */
if (a->neg)
{