Adding msg version.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>

CMakeLists.txt

@@ -33,6 +33,7 @@ target_sources(pico_fido PUBLIC
         ${CMAKE_CURRENT_LIST_DIR}/src/fido/files.c
         ${CMAKE_CURRENT_LIST_DIR}/src/fido/cmd_register.c
         ${CMAKE_CURRENT_LIST_DIR}/src/fido/cmd_authenticate.c
+        ${CMAKE_CURRENT_LIST_DIR}/src/fido/cmd_version.c
         )
 set(HSM_DRIVER "hid")
 include(pico-hsm-sdk/pico_hsm_sdk_import.cmake)

src/fido/cmd_version.c

@@ -0,0 +1,26 @@
+/*
+ * This file is part of the Pico FIDO distribution (https://github.com/polhenarejos/pico-fido).
+ * Copyright (c) 2022 Pol Henarejos.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <string.h>
+#include "apdu.h"
+#include "hsm.h"
+
+int cmd_version() {
+    memcpy(res_APDU, "U2F_V2", strlen("U2F_V2"));
+    res_APDU_size = strlen("U2F_V2");
+    return SW_OK();
+}

src/fido/fido.c

@@ -194,15 +194,18 @@ typedef struct cmd
 
 extern int cmd_register();
 extern int cmd_authenticate();
+extern int cmd_version();
 
 static const cmd_t cmds[] = {
     { U2F_REGISTER, cmd_register },
     { U2F_AUTHENTICATE, cmd_authenticate },
+    { U2F_VERSION, cmd_version },
     { 0x00, 0x0}
 };
 
 int fido_process_apdu() {
-    for (const cmd_t *cmd = cmds; cmd->ins != 0x00; cmd++) {
+    for (const cmd_t *cmd = cmds; cmd->ins != 0x00; cmd++)
+    {
         if (cmd->ins == INS(apdu)) {
             int r = cmd->cmd_handler();
             return r;