diff --git a/src/fido/fido.c b/src/fido/fido.c
new file mode 100644
index 0000000..00f2135
--- /dev/null
+++ b/src/fido/fido.c
@@ -0,0 +1,71 @@
+/*
+ * 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 "fido.h"
+#include "hsm.h"
+#include "apdu.h"
+#include <stdio.h>
+
+void init_fido();
+int fido_process_apdu();
+int fido_unload();
+
+const uint8_t fido_aid[] = {
+    8,
+    0xA0, 0x00, 0x00, 0x06, 0x47, 0x2F, 0x00, 0x01
+};
+
+app_t *fido_select(app_t *a) {
+    a->aid = fido_aid;
+    a->process_apdu = fido_process_apdu;
+    a->unload = fido_unload;
+    current_app = a;
+    init_fido();
+    return a;
+}
+
+void init_fido() {
+}
+
+void __attribute__ ((constructor)) fido_ctor() {
+    register_app(fido_select);
+    fido_select(&apps[0]);
+}
+
+int fido_unload() {
+    return CCID_OK;
+}
+
+typedef struct cmd
+{
+  uint8_t ins;
+  int (*cmd_handler)();
+} cmd_t;
+
+static const cmd_t cmds[] = {
+      { 0x00, 0x0}
+};
+
+int fido_process_apdu() {
+    for (const cmd_t *cmd = cmds; cmd->ins != 0x00; cmd++) {
+        if (cmd->ins == INS(apdu)) {
+            int r = cmd->cmd_handler();
+            return r;
+        }
+    }
+    return SW_INS_NOT_SUPPORTED();
+}
diff --git a/src/fido/fido.h b/src/fido/fido.h
new file mode 100644
index 0000000..e69de29