Add rescue app to communicate via webUSB.

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

pico_keys_sdk_import.cmake

@@ -189,6 +189,7 @@ set(SOURCES ${SOURCES}
     ${CMAKE_CURRENT_LIST_DIR}/src/crypto_utils.c
     ${CMAKE_CURRENT_LIST_DIR}/src/asn1.c
     ${CMAKE_CURRENT_LIST_DIR}/src/apdu.c
+    ${CMAKE_CURRENT_LIST_DIR}/src/rescue.c
     ${CMAKE_CURRENT_LIST_DIR}/src/led/led.c
 )
 

src/rescue.c

@@ -0,0 +1,85 @@
+/*
+ * This file is part of the Pico Keys SDK distribution (https://github.com/polhenarejos/pico-keys-sdk).
+ * 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 "pico_keys.h"
+#include "apdu.h"
+#include "version.h"
+
+int rescue_process_apdu();
+int rescue_unload();
+
+const uint8_t rescue_aid[] = {
+    8,
+    0xA0, 0x58, 0x3F, 0xC1, 0x9B, 0x7E, 0x4F, 0x21
+};
+
+int rescue_select(app_t *a, uint8_t force) {
+    a->process_apdu = rescue_process_apdu;
+    a->unload = rescue_unload;
+    memcpy(res_APDU, PICO_SDK_VERSION_STRING, strlen(PICO_SDK_VERSION_STRING));
+    res_APDU_size = (uint16_t)strlen((char *) res_APDU);
+    apdu.ne = res_APDU_size;
+    if (force) {
+        scan_flash();
+    }
+    return CCID_OK;
+}
+
+INITIALIZER ( rescue_ctor ) {
+    register_app(rescue_select, rescue_aid);
+}
+
+int rescue_unload() {
+    return CCID_OK;
+}
+
+int cmd_write() {
+    if (apdu.nc < 2) {
+        return SW_WRONG_LENGTH();
+    }
+
+    if (P1(apdu) == 0x1) { // PHY
+#ifndef ENABLE_EMULATION
+        int ret = phy_unserialize_data(apdu.data, apdu.nc, &phy_data);
+        if (ret == CCID_OK) {
+            file_put_data(ef_phy, apdu.data, apdu.nc);
+        }
+#endif
+    }
+    low_flash_available();
+    return SW_OK();
+}
+
+#define INS_WRITE            0x1C
+
+static const cmd_t cmds[] = {
+    { INS_WRITE, cmd_write },
+    { 0x00, 0x0 }
+};
+
+int rescue_process_apdu() {
+    if (CLA(apdu) != 0x80) {
+        return SW_CLA_NOT_SUPPORTED();
+    }
+    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();
+}