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Move 'q->neg = 0' to those places where it is needed

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(just in cases someone uses a negative modulus)
This commit is contained in:
Bodo Möller 2000-12-07 07:55:26 +00:00
parent aa66eba7c8
commit bc5f2740d2
1 changed files with 5 additions and 1 deletions
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6
crypto/bn/bn_sqrt.c
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@ -134,9 +134,11 @@ BIGNUM *BN_mod_sqrt(BIGNUM *in, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)
while (!BN_is_bit_set(p, e))
e++;
if (e > 2)
{
/* we don't need this q if e = 1 or 2 */
if (!BN_rshift(q, p, e)) goto end;
q->neg = 0;
q->neg = 0;
}
if (e == 1)
{
@ -148,6 +150,7 @@ BIGNUM *BN_mod_sqrt(BIGNUM *in, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)
* so we can use exponent (p+1)/4, i.e. (p-3)/4 + 1.
*/
if (!BN_rshift(q, p, 2)) goto end;
q->neg = 0;
if (!BN_add_word(q, 1)) goto end;
if (!BN_mod_exp(ret, a, q, p, ctx)) goto end;
err = 0;
@ -194,6 +197,7 @@ BIGNUM *BN_mod_sqrt(BIGNUM *in, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)
/* b := (2*a)^((p-5)/8) */
if (!BN_rshift(q, p, 3)) goto end;
q->neg = 0;
if (!BN_mod_exp(b, t, q, p, ctx)) goto end;
/* y := b^2 */