trusty: keymaster: Implement import_key

    const keymaster_blob_t* key_data, keymaster_key_blob_t* key_blob,

    keymaster_key_characteristics_t* characteristics) {

    ALOGD("Device received import_key");

    if (error_ != KM_ERROR_OK) {

        return error_;

    }

    if (!params || !key_data) {

        return KM_ERROR_UNEXPECTED_NULL_POINTER;

    }

    if (!key_blob) {

        return KM_ERROR_OUTPUT_PARAMETER_NULL;

    }

    ImportKeyRequest request(message_version_);

    request.key_description.Reinitialize(*params);

    request.key_description.push_back(TAG_CREATION_DATETIME, java_time(time(NULL)));

    request.key_format = key_format;

    request.SetKeyMaterial(key_data->data, key_data->data_length);

    ImportKeyResponse response(message_version_);

    keymaster_error_t err = Send(KM_IMPORT_KEY, request, &response);

    if (err != KM_ERROR_OK) {

        return err;

    }

    key_blob->key_material_size = response.key_blob.key_material_size;

    key_blob->key_material =

        DuplicateBuffer(response.key_blob.key_material, response.key_blob.key_material_size);

    if (!key_blob->key_material) {

        return KM_ERROR_MEMORY_ALLOCATION_FAILED;

    }

    if (characteristics) {

        response.enforced.CopyToParamSet(&characteristics->hw_enforced);

        response.unenforced.CopyToParamSet(&characteristics->sw_enforced);

    }

    return KM_ERROR_OK;

}