diff --git a/hw/usb/u2f.h b/hw/usb/u2f.h
new file mode 100644
index 0000000000..db30f3586b
--- /dev/null
+++ b/hw/usb/u2f.h
@@ -0,0 +1,92 @@
+/*
+ * U2F USB device.
+ *
+ * Copyright (c) 2020 César Belley <cesar.belley@lse.epita.fr>
+ * Written by César Belley <cesar.belley@lse.epita.fr>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef U2F_H
+#define U2F_H
+
+#include "hw/qdev-core.h"
+
+#define U2FHID_PACKET_SIZE 64
+#define U2FHID_PENDING_IN_NUM 32
+
+typedef struct U2FKeyState U2FKeyState;
+typedef struct U2FKeyInfo U2FKeyInfo;
+
+#define TYPE_U2F_KEY "u2f-key"
+#define U2F_KEY(obj) \
+    OBJECT_CHECK(U2FKeyState, (obj), TYPE_U2F_KEY)
+#define U2F_KEY_CLASS(klass) \
+    OBJECT_CLASS_CHECK(U2FKeyClass, (klass), TYPE_U2F_KEY)
+#define U2F_KEY_GET_CLASS(obj) \
+    OBJECT_GET_CLASS(U2FKeyClass, (obj), TYPE_U2F_KEY)
+
+/*
+ * Callbacks to be used by the U2F key base device (i.e. hw/u2f.c)
+ * to interact with its variants (i.e. hw/u2f-*.c)
+ */
+typedef struct U2FKeyClass {
+    /*< private >*/
+    USBDeviceClass parent_class;
+
+    /*< public >*/
+    void (*recv_from_guest)(U2FKeyState *key,
+                            const uint8_t packet[U2FHID_PACKET_SIZE]);
+    void (*realize)(U2FKeyState *key, Error **errp);
+    void (*unrealize)(U2FKeyState *key);
+} U2FKeyClass;
+
+/*
+ * State of the U2F key base device (i.e. hw/u2f.c)
+ */
+typedef struct U2FKeyState {
+    USBDevice dev;
+    USBEndpoint *ep;
+    uint8_t idle;
+
+    /* Pending packets to be send to the guest */
+    uint8_t pending_in[U2FHID_PENDING_IN_NUM][U2FHID_PACKET_SIZE];
+    uint8_t pending_in_start;
+    uint8_t pending_in_end;
+    uint8_t pending_in_num;
+} U2FKeyState;
+
+/*
+ * API to be used by the U2F key device variants (i.e. hw/u2f-*.c)
+ * to interact with the the U2F key base device (i.e. hw/u2f.c)
+ */
+void u2f_send_to_guest(U2FKeyState *key,
+                       const uint8_t packet[U2FHID_PACKET_SIZE]);
+
+extern const VMStateDescription vmstate_u2f_key;
+
+#define VMSTATE_U2F_KEY(_field, _state) {                            \
+    .name       = (stringify(_field)),                               \
+    .size       = sizeof(U2FKeyState),                               \
+    .vmsd       = &vmstate_u2f_key,                                  \
+    .flags      = VMS_STRUCT,                                        \
+    .offset     = vmstate_offset_value(_state, _field, U2FKeyState), \
+}
+
+#endif /* U2F_H */