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bn: fix occurance of negative zero in BN_rshift1()

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Reviewed-by: Rich Salz <rsalz@openssl.org>
This commit is contained in:
Richard Levitte 2017-02-01 02:29:46 +01:00
parent 38d1b3cc02
commit 0a2dcb6990
1 changed files with 2 additions and 0 deletions
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2
crypto/bn/bn_shift.c
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@ -74,6 +74,8 @@ int BN_rshift1(BIGNUM *r, const BIGNUM *a)
c = (t & 1) ? BN_TBIT : 0;
}
r->top = j;
if (!r->top)
r->neg = 0; /* don't allow negative zero */
bn_check_top(r);
return (1);
}