trusty: keymaster: Implement export_key
Test: builds
Change-Id: I47d1ed4144014fca47fdf67f9f4d2eb0d9b1eb8f
diff --git a/trusty/keymaster/trusty_keymaster_device.cpp b/trusty/keymaster/trusty_keymaster_device.cpp
index 04826df..3610456 100644
--- a/trusty/keymaster/trusty_keymaster_device.cpp
+++ b/trusty/keymaster/trusty_keymaster_device.cpp
@@ -323,6 +323,37 @@
const keymaster_blob_t* app_data,
keymaster_blob_t* export_data) {
ALOGD("Device received export_key");
+
+ if (error_ != KM_ERROR_OK) {
+ return error_;
+ }
+ if (!key_to_export || !key_to_export->key_material) {
+ return KM_ERROR_UNEXPECTED_NULL_POINTER;
+ }
+ if (!export_data) {
+ return KM_ERROR_OUTPUT_PARAMETER_NULL;
+ }
+
+ export_data->data = nullptr;
+ export_data->data_length = 0;
+
+ ExportKeyRequest request(message_version_);
+ request.key_format = export_format;
+ request.SetKeyMaterial(*key_to_export);
+ AddClientAndAppData(client_id, app_data, &request);
+
+ ExportKeyResponse response(message_version_);
+ keymaster_error_t err = Send(KM_EXPORT_KEY, request, &response);
+ if (err != KM_ERROR_OK) {
+ return err;
+ }
+
+ export_data->data_length = response.key_data_length;
+ export_data->data = DuplicateBuffer(response.key_data, response.key_data_length);
+ if (!export_data->data) {
+ return KM_ERROR_MEMORY_ALLOCATION_FAILED;
+ }
+
return KM_ERROR_OK;
}