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Optimization of ossl_ec_key_public_check()

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We can do just the quick check if cofactor == 1 as the
fact that the point is on the curve already implies
that order * point = infinity.

Fixes #21833

Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/24816)
This commit is contained in:
Tomas Mraz 2024-07-08 18:01:34 +02:00
parent 01753c09bb
commit b916940752
1 changed files with 6 additions and 0 deletions
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6
crypto/ec/ec_key.c
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@ -563,10 +563,16 @@ int ossl_ec_key_public_check(const EC_KEY *eckey, BN_CTX *ctx)
int ret = 0;
EC_POINT *point = NULL;
const BIGNUM *order = NULL;
const BIGNUM *cofactor = EC_GROUP_get0_cofactor(eckey->group);
if (!ossl_ec_key_public_check_quick(eckey, ctx))
return 0;
if (cofactor != NULL && BN_is_one(cofactor)) {
/* Skip the unnecessary expensive computation for curves with cofactor of 1. */
return 1;
}
point = EC_POINT_new(eckey->group);
if (point == NULL)
return 0;