COPY_UTF8_PARAM
COPY_UTF8_PARAM(params, OSSL_PKEY_PARAM_GROUP_NAME, gctx->group_name);
COPY_UTF8_PARAM(params, OSSL_PKEY_PARAM_EC_FIELD_TYPE, gctx->field_type);
COPY_UTF8_PARAM(params, OSSL_PKEY_PARAM_EC_ENCODING, gctx->encoding);
COPY_UTF8_PARAM(params, OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT, gctx->pt_format);
COPY_UTF8_PARAM(params, OSSL_PKEY_PARAM_EC_GROUP_CHECK_TYPE, gctx->group_check);