


#include "internal/deprecated.h"

#include "ec_local.h"
#include <openssl/err.h>

int EC_GROUP_check_named_curve(const EC_GROUP *group, int nist_only,
                               BN_CTX *ctx)
{
    int nid;
    BN_CTX *new_ctx = NULL;

    if (group == NULL) {
        ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
        return NID_undef;
    }

    if (ctx == NULL) {
        ctx = new_ctx = BN_CTX_new_ex(NULL);
        if (ctx == NULL) {
            ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
            return NID_undef;
        }
    }

    nid = ossl_ec_curve_nid_from_params(group, ctx);
    if (nid > 0 && nist_only && EC_curve_nid2nist(nid) == NULL)
        nid = NID_undef;

    BN_CTX_free(new_ctx);
    return nid;
}

int EC_GROUP_check(const EC_GROUP *group, BN_CTX *ctx)
{
#ifdef FIPS_MODULE
    
    return EC_GROUP_check_named_curve(group, 1, ctx) >= 0 ? 1 : 0;
#else
    int ret = 0;
    const BIGNUM *order;
    BN_CTX *new_ctx = NULL;
    EC_POINT *point = NULL;

    if (group == NULL || group->meth == NULL) {
        ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
        return 0;
    }

    
    if ((group->meth->flags & EC_FLAGS_CUSTOM_CURVE) != 0)
        return 1;

    if (ctx == NULL) {
        ctx = new_ctx = BN_CTX_new();
        if (ctx == NULL) {
            ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
            goto err;
        }
    }

    
    if (!EC_GROUP_check_discriminant(group, ctx)) {
        ERR_raise(ERR_LIB_EC, EC_R_DISCRIMINANT_IS_ZERO);
        goto err;
    }

    
    if (group->generator == NULL) {
        ERR_raise(ERR_LIB_EC, EC_R_UNDEFINED_GENERATOR);
        goto err;
    }
    if (EC_POINT_is_on_curve(group, group->generator, ctx) <= 0) {
        ERR_raise(ERR_LIB_EC, EC_R_POINT_IS_NOT_ON_CURVE);
        goto err;
    }

    
    if ((point = EC_POINT_new(group)) == NULL)
        goto err;
    order = EC_GROUP_get0_order(group);
    if (order == NULL)
        goto err;
    if (BN_is_zero(order)) {
        ERR_raise(ERR_LIB_EC, EC_R_UNDEFINED_ORDER);
        goto err;
    }

    if (!EC_POINT_mul(group, point, order, NULL, NULL, ctx))
        goto err;
    if (!EC_POINT_is_at_infinity(group, point)) {
        ERR_raise(ERR_LIB_EC, EC_R_INVALID_GROUP_ORDER);
        goto err;
    }

    ret = 1;

 err:
    BN_CTX_free(new_ctx);
    EC_POINT_free(point);
    return ret;
#endif 
}
