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In EC_KEY_set_public_key_affine_coordinates include explicit check to see passed components do not exceed field order

This commit is contained in:
Dr. Stephen Henson 2011-11-16 13:28:11 +00:00
parent 9eca2399f1
commit 901b9b5c36
1 changed files with 5 additions and 3 deletions
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8
crypto/ec/ec_key.c
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@ -511,10 +511,12 @@ int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x, BIGNUM *y)
tx, ty, ctx))
goto err;
}
/* Check if retrieved coordinates match originals: if not values
* are out of range.
/* Check if retrieved coordinates match originals and are less than
* field order: if not values are out of range.
*/
if (BN_cmp(x, tx) || BN_cmp(y, ty))
if (BN_cmp(x, tx) || BN_cmp(y, ty)
|| (BN_cmp(x, &key->group->field) >= 0)
|| (BN_cmp(y, &key->group->field) >= 0))
{
ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES,
EC_R_COORDINATES_OUT_OF_RANGE);