EC_KEY_set_public_key_affine_coordinates
int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x, BIGNUM *y);
LCRYPTO_ALIAS(EC_KEY_set_public_key_affine_coordinates);
LCRYPTO_USED(EC_KEY_set_public_key_affine_coordinates);
if (!EC_KEY_set_public_key_affine_coordinates(key, pub_x, pub_y))