Protect keydev if available (only for RP2350).

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

CMakeLists.txt

@@ -17,6 +17,11 @@
 
 cmake_minimum_required(VERSION 3.13)
 
+if(ESP_PLATFORM)
+set(EXTRA_COMPONENT_DIRS src pico-keys-sdk/src)
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+else()
+
 if(ENABLE_EMULATION)
 else()
 include(pico_sdk_import.cmake)
@@ -33,7 +38,7 @@ pico_sdk_init()
 endif()
 
 add_executable(pico_fido)
-
+endif()
 option(ENABLE_UP_BUTTON "Enable/disable user presence button" ON)
 if(ENABLE_UP_BUTTON)
     add_definitions(-DENABLE_UP_BUTTON=1)
@@ -110,42 +115,50 @@ endif()
 
 set(USB_ITF_HID 1)
 include(pico-keys-sdk/pico_keys_sdk_import.cmake)
-
+if(ESP_PLATFORM)
+    project(pico_fido)
+endif()
 set(INCLUDES ${INCLUDES}
         ${CMAKE_CURRENT_LIST_DIR}/src/fido
         )
-
+if(NOT ESP_PLATFORM)
 target_sources(pico_fido PUBLIC ${SOURCES})
 target_include_directories(pico_fido PUBLIC ${INCLUDES})
 
 target_compile_options(pico_fido PUBLIC
     -Wall
+    )
+if (NOT MSVC)
+target_compile_options(pico_fido PUBLIC
     -Werror
     )
+
 string(FIND ${CMAKE_C_COMPILER} ":" COMPILER_COLON)
 if (${COMPILER_COLON} GREATER_EQUAL 0)
         target_compile_options(pico_fido PUBLIC
         -Wno-error=use-after-free
         )
 endif()
+endif(NOT MSVC)
 
 if(ENABLE_EMULATION)
-
-target_compile_options(pico_fido PUBLIC
-        -fdata-sections
-        -ffunction-sections
-        )
-        if(APPLE)
-        target_link_options(pico_fido PUBLIC
-                -Wl,-dead_strip
-                )
-        else()
-        target_link_options(pico_fido PUBLIC
-                -Wl,--gc-sections
-                )
-        target_link_libraries(pico_fido PRIVATE m)
-        endif (APPLE)
+    if(NOT MSVC)
+    target_compile_options(pico_fido PUBLIC
+            -fdata-sections
+            -ffunction-sections
+            )
+    endif(NOT MSVC)
+    if(APPLE)
+    target_link_options(pico_fido PUBLIC
+            -Wl,-dead_strip
+            )
+    else()
+    target_link_options(pico_fido PUBLIC
+            -Wl,--gc-sections
+            )
+    endif (APPLE)
+    target_link_libraries(pico_fido PRIVATE pthread m)
 else()
-pico_add_extra_outputs(pico_fido)
-target_link_libraries(pico_fido PRIVATE pico_keys_sdk pico_stdlib pico_multicore hardware_flash hardware_sync hardware_adc pico_unique_id hardware_rtc tinyusb_device tinyusb_board)
+target_link_libraries(pico_fido PRIVATE pico_keys_sdk pico_stdlib pico_multicore hardware_flash hardware_sync hardware_adc pico_unique_id pico_aon_timer tinyusb_device tinyusb_board)
+endif()
 endif()

README.md

@@ -1,8 +1,8 @@
 # Pico FIDO
-This project aims at transforming your Raspberry Pico into a FIDO key integrated. The Pico works as a FIDO key, like a normal USB key for authentication.
+This project transforms your Raspberry Pi Pico into an integrated FIDO Passkey, functioning like a standard USB Passkey for authentication.
 
 ## Features
-Pico FIDO has implemented the following features:
+Pico FIDO includes the following features:
 
 - CTAP 2.1 / CTAP 1
 - WebAuthn
@@ -10,16 +10,16 @@ Pico FIDO has implemented the following features:
 - HMAC-Secret extension
 - CredProtect extension
 - User presence enforcement through physical button
-- User Verification with PIN
-- Discoverable credentials
+- User verification with PIN
+- Discoverable credentials (resident keys)
 - Credential management
 - ECDSA authentication
-- Authentication with SECP256R1, SECP384R1, SECP521R1 and SECP256K1 curves.
+- Support for SECP256R1, SECP384R1, SECP521R1, and SECP256K1 curves
 - App registration and login
 - Device selection
-- Support for vendor Config
+- Support for vendor configuration
 - Backup with 24 words
-- Secure lock to protect the device from flash dumpings
+- Secure lock to protect the device from flash dumps
 - Permissions support (MC, GA, CM, ACFG, LBW)
 - Authenticator configuration
 - minPinLength extension
@@ -27,50 +27,54 @@ Pico FIDO has implemented the following features:
 - Enterprise attestation
 - credBlobs extension
 - largeBlobKey extension
-- largeBlobs support (2048 bytes máx.)
+- Large blobs support (2048 bytes max)
 - OATH (based on YKOATH protocol specification)
 - TOTP / HOTP
 - Yubikey OTP
 - Challenge-response generation
 - Emulated keyboard interface
-- Button press generates an OTP that is written directly is it was typed
+- Button press generates an OTP that is directly typed
 - Yubico YKMAN compatible
 - Nitrokey nitropy and nitroapp compatible
 
-All these features are compliant with the specification. Therefore, if you detect some behaviour that is not expected or it does not follow the rules of specs, please open an issue.
+All features comply with the specifications. If you encounter unexpected behavior or deviations from the specifications, please open an issue.
 
-## Security considerations
-Pico FIDO is an open platform so be careful. The contents in the flash memory may be easily dumpled and obtain the private/master keys. Therefore, it is not possible to encrypt the content. At least, one key (the master, the supreme key) must be stored in clear text.
+## Security Considerations
 
-If the Pico is stolen the contents of private and secret keys can be read.
+Pico FIDO is an open platform, so exercise caution. The flash memory contents can be easily dumped, potentially revealing private/master keys. It is not feasible to encrypt the content, meaning at least one key (the master key) must be stored in clear text.
+
+If the Pico is stolen, the private and secret keys can be accessed.
 
 ## Download
-Please, go to the [Release page](https://github.com/polhenarejos/pico-fido/releases "Release page") and download the UF2 file for your board.
+Please visit the [Release page](https://github.com/polhenarejos/pico-fido/releases "Release page") to download the UF2 file for your board.
 
-Note that UF2 files are shiped with a dummy VID/PID to avoid license issues (FEFF:FCFD). If you are planning to use it with OpenSC or similar, you should modify Info.plist of CCID driver to add these VID/PID or use the [Pico Patcher tool](https://www.picokeys.com/pico-patcher/).
+Note that UF2 files are shipped with a dummy VID/PID to avoid license issues (FEFF:FCFD). If you plan to use it with OpenSC or similar software, you will need to modify the Info.plist of the CCID driver to add these VID/PID values or use the [Pico Patcher tool](https://www.picokeys.com/pico-patcher/).
 
-Alternatively you can use the legacy VID/PID patcher as follows:
-`./patch_vidpid.sh VID:PID input_hsm_file.uf2 output_hsm_file.uf2`
+Alternatively, you can use the legacy VID/PID patcher with the following command:
+```sh
+./patch_vidpid.sh VID:PID input_hsm_file.uf2 output_hsm_file.uf2
+```
+You can use any VID/PID (e.g., 234b:0000 from FISJ), but remember that you are not authorized to distribute the binary with a VID/PID that you do not own.
 
-You can use whatever VID/PID (i.e., 234b:0000 from FISJ), but remember that you are not authorized to distribute the binary with a VID/PID that you do not own.
-
-Note that the pure-browser option [Pico Patcher tool](https://www.picokeys.com/pico-patcher/) is the most recommended.
+For ease of use, the pure-browser option [Pico Patcher tool](https://www.picokeys.com/pico-patcher/) is highly recommended.
 
 ## Build
-Before building, ensure you have installed the toolchain for the Pico and the Pico SDK is properly located in your drive.
+Before building, ensure you have installed the toolchain for the Pico and that the Pico SDK is properly located on your drive.
 
-    git clone https://github.com/polhenarejos/pico-fido
-    cd pico-fido
-    mkdir build
-    cd build
-    PICO_SDK_PATH=/path/to/pico-sdk cmake .. -DPICO_BOARD=board_type -DUSB_VID=0x1234 -DUSB_PID=0x5678
-    make
+```sh
+git clone https://github.com/polhenarejos/pico-fido
+cd pico-fido
+mkdir build
+cd build
+PICO_SDK_PATH=/path/to/pico-sdk cmake .. -DPICO_BOARD=board_type -DUSB_VID=0x1234 -DUSB_PID=0x5678
+make
+```
 
-Note that PICO_BOARD, USB_VID and USB_PID are optional. If not provided, pico board and VID/PID FEFF:FCFD will be used.
+Note that `PICO_BOARD`, `USB_VID`, and `USB_PID` are optional. If not provided, the default Pico board and VID/PID `FEFF:FCFD` will be used.
 
-After make ends, the binary file pico_fido.uf2 will be generated. Put your pico board into loading mode, by pushing BOOTSEL button while pluging on, and copy the UF2 to the new fresh usb mass storage Pico device. Once copied, the pico mass storage will be disconnected automatically and the pico board will reset with the new firmware. A blinking led will indicate the device is ready to work.
+After `make` finishes, the binary file `pico_fido.uf2` will be generated. Put your Pico board into loading mode by holding the BOOTSEL button while plugging it in, then copy the UF2 file to the new USB mass storage Pico device. Once copied, the Pico mass storage will disconnect automatically, and the Pico board will reset with the new firmware. A blinking LED will indicate that the device is ready to work.
 
-**Remark:** Pico Fido uses HID interface and thus, VID/PID values are irrelevant in terms of operativity. You can safely use any arbitrary value or the default ones.
+**Remark:** Pico FIDO uses the HID interface, so VID/PID values are irrelevant in terms of operativity. You can safely use any arbitrary values or the default ones. They are only necessary in case you need to use 3rd-party tools from other vendors.
 
 ## Led blink
 Pico FIDO uses the led to indicate the current status. Four states are available:
@@ -96,20 +100,21 @@ While processing, the Pico FIDO is busy and cannot receive additional commands u
 
 ## Driver
 
-Pico FIDO uses the `HID` driver, present in all OS. It should be detected by all OS and browser/applications, like normal USB FIDO keys.
+Pico FIDO uses the `HID` driver, which is present in all operating systems. It should be detected by all OS and browser/applications just like normal USB FIDO keys.
 
 ## Tests
 
-Tests can be found at `tests` folder. It is based on [FIDO2 tests](https://github.com/solokeys/fido2-tests "FIDO2 tests") from Solokeys, but adapted to [python-fido2](https://github.com/Yubico/python-fido2 "python-fido2") v1.0 package, which is a major refactor from previous 0.8 version and includes latests improvements from CTAP 2.1.
+Tests can be found in the `tests` folder. They are based on [FIDO2 tests](https://github.com/solokeys/fido2-tests "FIDO2 tests") from Solokeys but adapted to the [python-fido2](https://github.com/Yubico/python-fido2 "python-fido2") v1.0 package, which is a major refactor from the previous 0.8 version and includes the latest improvements from CTAP 2.1.
 
-All tests can be run by
+To run all tests, use:
 
-```
+```sh
 pytest
 ```
 
-or by selecting a subset with `-k <test>` flag:
-```
+To run a subset of tests, use the `-k <test>` flag:
+
+```sh
 pytest -k test_credprotect
 ```
 

build_pico_fido.sh

@@ -1,45 +1,87 @@
 #!/bin/bash
 
 VERSION_MAJOR="5"
-VERSION_MINOR="8"
+VERSION_MINOR="12"
 
 rm -rf release/*
 cd build_release
 
-for board in adafruit_feather_rp2040 \
+for board in 0xcb_helios \
+    adafruit_feather_rp2040_usb_host \
+    adafruit_feather_rp2040 \
     adafruit_itsybitsy_rp2040 \
     adafruit_kb2040 \
     adafruit_macropad_rp2040 \
     adafruit_qtpy_rp2040 \
     adafruit_trinkey_qt2040 \
+    amethyst_fpga \
+    archi \
     arduino_nano_rp2040_connect \
+    cytron_maker_pi_rp2040 \
     datanoisetv_rp2040_dsp \
     eetree_gamekit_rp2040 \
     garatronic_pybstick26_rp2040 \
+    gen4_rp2350_24 \
+    gen4_rp2350_24ct \
+    gen4_rp2350_24t \
+    gen4_rp2350_28 \
+    gen4_rp2350_28ct \
+    gen4_rp2350_28t \
+    gen4_rp2350_32 \
+    gen4_rp2350_32ct \
+    gen4_rp2350_32t \
+    gen4_rp2350_35 \
+    gen4_rp2350_35ct \
+    gen4_rp2350_35t \
+    hellbender_2350A_devboard \
+    ilabs_challenger_rp2350_bconnect \
+    ilabs_challenger_rp2350_wifi_ble \
+    ilabs_opendec02 \
+    melopero_perpetuo_rp2350_lora \
     melopero_shake_rp2040 \
+    metrotech_xerxes_rp2040 \
+    net8086_usb_interposer \
     nullbits_bit_c_pro \
+    phyx_rick_tny_rp2350 \
+    pi-plates_micropi \
     pico \
     pico_w \
+    pico2 \
     pimoroni_badger2040 \
     pimoroni_interstate75 \
     pimoroni_keybow2040 \
     pimoroni_motor2040 \
     pimoroni_pga2040 \
+    pimoroni_pga2350 \
+    pimoroni_pico_plus2_rp2350 \
     pimoroni_picolipo_4mb \
     pimoroni_picolipo_16mb \
     pimoroni_picosystem \
     pimoroni_plasma2040 \
+    pimoroni_plasma2350 \
     pimoroni_servo2040 \
     pimoroni_tiny2040 \
     pimoroni_tiny2040_2mb \
+    pimoroni_tiny2350 \
     pololu_3pi_2040_robot \
+    pololu_zumo_2040_robot \
     seeed_xiao_rp2040 \
+    seeed_xiao_rp2350 \
     solderparty_rp2040_stamp \
     solderparty_rp2040_stamp_carrier \
     solderparty_rp2040_stamp_round_carrier \
+    solderparty_rp2350_stamp_xl \
+    solderparty_rp2350_stamp \
     sparkfun_micromod \
     sparkfun_promicro \
+    sparkfun_promicro_rp2350 \
     sparkfun_thingplus \
+    switchscience_picossci2_conta_base \
+    switchscience_picossci2_dev_board \
+    switchscience_picossci2_micro \
+    switchscience_picossci2_rp2350_breakout \
+    switchscience_picossci2_tiny \
+    tinycircuits_thumby_color_rp2350 \
     vgaboard \
     waveshare_rp2040_lcd_0.96 \
     waveshare_rp2040_lcd_1.28 \
@@ -47,6 +89,10 @@ for board in adafruit_feather_rp2040 \
     waveshare_rp2040_plus_4mb \
     waveshare_rp2040_plus_16mb \
     waveshare_rp2040_zero \
+    weact_studio_rp2040_2mb \
+    weact_studio_rp2040_4mb \
+    weact_studio_rp2040_8mb \
+    weact_studio_rp2040_16mb \
     wiznet_w5100s_evb_pico
 do
     rm -rf *

pico-fido-patch-vidpid.sh

@@ -87,7 +87,7 @@ fi
 LITTLE_VID="\x${VID:2:2}\x${VID:0:2}"
 LITTLE_PID="\x${PID:2:2}\x${PID:0:2}"
 
-perl -pi -e "s/\xfe\xca\x31\x42\x$VERSION_MINOR\x$VERSION_MAJOR\x01\x02\x03\x01/$LITTLE_VID$LITTLE_PID\x$VERSION_MINOR\x$VERSION_MAJOR\x01\x02\x03\x01/" $UF2_FILE_OF
+perl -pi -e "s/[\x00-\xff]{4}\x$VERSION_MINOR\x$VERSION_MAJOR\x01\x02\x03\x01\x00\x00/$LITTLE_VID$LITTLE_PID\x$VERSION_MINOR\x$VERSION_MAJOR\x01\x02\x03\x01\x00\x00/" $UF2_FILE_OF
 
 echo "Done!"
 echo ""

pico-keys-sdk

@@ -1 +1 @@
-Subproject commit f4ad8e1af2e2657f3900f1e01db031d7d73d623b
+Subproject commit 108cfec47c8b72472acbf6d3f8cc50260bfb09bd

sdkconfig.defaults

@@ -0,0 +1,53 @@
+# This file was generated using idf.py save-defconfig. It can be edited manually.
+# Espressif IoT Development Framework (ESP-IDF) Project Minimal Configuration
+#
+IGNORE_UNKNOWN_FILES_FOR_MANAGED_COMPONENTS=1
+
+CONFIG_TINYUSB=y
+
+CONFIG_PARTITION_TABLE_CUSTOM=y
+CONFIG_PARTITION_TABLE_CUSTOM_FILENAME="pico-keys-sdk/config/esp32/partitions.csv"
+CONFIG_PARTITION_TABLE_FILENAME="pico-keys-sdk/config/esp32/partitions.csv"
+CONFIG_ESPTOOLPY_FLASHSIZE_4MB=y
+CONFIG_WL_SECTOR_SIZE_512=y
+CONFIG_WL_SECTOR_MODE_PERF=y
+
+CONFIG_MBEDTLS_CMAC_C=y
+CONFIG_MBEDTLS_CHACHA20_C=y
+CONFIG_MBEDTLS_POLY1305_C=y
+CONFIG_MBEDTLS_CHACHAPOLY_C=y
+CONFIG_MBEDTLS_HKDF_C=y
+CONFIG_MBEDTLS_HARDWARE_ECC=y
+CONFIG_MBEDTLS_HARDWARE_GCM=y
+# CONFIG_MBEDTLS_HARDWARE_MPI is not set
+CONFIG_MBEDTLS_HARDWARE_SHA=y
+CONFIG_MBEDTLS_HARDWARE_AES=y
+# CONFIG_MBEDTLS_ROM_MD5 is not set
+CONFIG_MBEDTLS_SHA512_C=y
+CONFIG_MBEDTLS_TLS_DISABLED=y
+# CONFIG_MBEDTLS_TLS_ENABLED is not set
+# CONFIG_ESP_TLS_USE_DS_PERIPHERAL is not set
+# CONFIG_ESP_WIFI_ENABLED is not set
+# CONFIG_ESP_WIFI_MBEDTLS_CRYPTO is not set
+# CONFIG_ESP_WIFI_MBEDTLS_TLS_CLIENT is not set
+# CONFIG_WPA_MBEDTLS_CRYPTO is not set
+# CONFIG_MBEDTLS_PSK_MODES is not set
+# CONFIG_MBEDTLS_KEY_EXCHANGE_RSA is not set
+# CONFIG_MBEDTLS_KEY_EXCHANGE_ELLIPTIC_CURVE is not set
+# CONFIG_MBEDTLS_KEY_EXCHANGE_ECDHE_RSA is not set
+# CONFIG_MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA is not set
+# CONFIG_MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA is not set
+# CONFIG_MBEDTLS_KEY_EXCHANGE_ECDH_RSA is not set
+# CONFIG_MBEDTLS_SSL_RENEGOTIATION is not set
+# CONFIG_MBEDTLS_SSL_PROTO_TLS1_2 is not set
+# CONFIG_MBEDTLS_SSL_PROTO_GMTSSL1_1 is not set
+# CONFIG_MBEDTLS_SSL_PROTO_DTLS is not set
+# CONFIG_MBEDTLS_SSL_ALPN is not set
+# CONFIG_MBEDTLS_CLIENT_SSL_SESSION_TICKETS is not set
+# CONFIG_MBEDTLS_SERVER_SSL_SESSION_TICKETS is not set
+# CONFIG_ESP32_WIFI_ENABLE_WPA3_SAE is not set
+# CONFIG_ESP32_WIFI_ENABLE_WPA3_OWE_STA is not set
+# CONFIG_ESP_WIFI_ENABLE_WPA3_SAE is not set
+# CONFIG_ESP_WIFI_ENABLE_WPA3_OWE_STA is not set
+
+CONFIG_ESP_COREDUMP_ENABLE_TO_UART=y

src/fido/CMakeLists.txt

@@ -0,0 +1,6 @@
+idf_component_register(
+    SRCS ${SOURCES}
+    INCLUDE_DIRS . ../../pico-keys-sdk/src ../../pico-keys-sdk/src/fs ../../pico-keys-sdk/src/rng ../../pico-keys-sdk/src/usb  ../../pico-keys-sdk/tinycbor/src
+    REQUIRES bootloader_support esp_partition esp_tinyusb zorxx__neopixel mbedtls efuse
+)
+idf_component_set_property(${COMPONENT_NAME} WHOLE_ARCHIVE ON)

src/fido/cbor.c

@@ -15,7 +15,8 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef ENABLE_EMULATION
+#include "pico_keys.h"
+#if !defined(ENABLE_EMULATION) && !defined(ESP_PLATFORM)
 #include "pico/stdlib.h"
 #endif
 #include "hid/ctap_hid.h"
@@ -43,12 +44,11 @@ int cbor_large_blobs(const uint8_t *data, size_t len);
 
 extern int cmd_read_config();
 
-const uint8_t aaguid[16] =
-{ 0x89, 0xFB, 0x94, 0xB7, 0x06, 0xC9, 0x36, 0x73, 0x9B, 0x7E, 0x30, 0x52, 0x6D, 0x96, 0x81, 0x45 };                          // First 16 bytes of SHA256("Pico FIDO2")
+const uint8_t aaguid[16] = { 0x89, 0xFB, 0x94, 0xB7, 0x06, 0xC9, 0x36, 0x73, 0x9B, 0x7E, 0x30, 0x52, 0x6D, 0x96, 0x81, 0x45 }; // First 16 bytes of SHA256("Pico FIDO2")
 
 const uint8_t *cbor_data = NULL;
 size_t cbor_len = 0;
-uint8_t cmd = 0;
+uint8_t cbor_cmd = 0;
 
 int cbor_parse(uint8_t cmd, const uint8_t *data, size_t len) {
     if (len == 0 && cmd == CTAPHID_CBOR) {
@@ -58,7 +58,6 @@ int cbor_parse(uint8_t cmd, const uint8_t *data, size_t len) {
         DEBUG_DATA(data + 1, len - 1);
     }
     if (cap_supported(CAP_FIDO2)) {
-        driver_prepare_response_hid();
         if (cmd == CTAPHID_CBOR) {
             if (data[0] == CTAP_MAKE_CREDENTIAL) {
                 return cbor_make_credential(data + 1, len - 1);
@@ -96,6 +95,7 @@ int cbor_parse(uint8_t cmd, const uint8_t *data, size_t len) {
         }
         else if (cmd == 0xC2) {
             if (cmd_read_config() == 0x9000) {
+                memmove(res_APDU-1, res_APDU, res_APDU_size);
                 res_APDU_size -= 1;
                 return 0;
             }
@@ -104,50 +104,47 @@ int cbor_parse(uint8_t cmd, const uint8_t *data, size_t len) {
     return CTAP1_ERR_INVALID_CMD;
 }
 
-#ifndef ENABLE_EMULATION
-void cbor_thread() {
-
+void cbor_thread(void) {
     card_init_core1();
     while (1) {
         uint32_t m;
         queue_remove_blocking(&usb_to_card_q, &m);
+        uint32_t flag = m + 1;
+        queue_add_blocking(&card_to_usb_q, &flag);
 
         if (m == EV_EXIT) {
-
             break;
         }
-        apdu.sw = cbor_parse(cmd, cbor_data, cbor_len);
+        apdu.sw = cbor_parse(cbor_cmd, cbor_data, cbor_len);
         if (apdu.sw == 0) {
             DEBUG_DATA(res_APDU + 1, res_APDU_size);
         }
         else {
             res_APDU[0] = apdu.sw;
-            apdu.sw = 0;
+            //apdu.sw = 0;
         }
 
         finished_data_size = res_APDU_size + 1;
 
-        uint32_t flag = EV_EXEC_FINISHED;
+        flag = EV_EXEC_FINISHED;
         queue_add_blocking(&card_to_usb_q, &flag);
     }
-}
+#ifdef ESP_PLATFORM
+    vTaskDelete(NULL);
 #endif
+}
 
 int cbor_process(uint8_t last_cmd, const uint8_t *data, size_t len) {
     cbor_data = data;
     cbor_len = len;
-    cmd = last_cmd;
+    cbor_cmd = last_cmd;
+    ctap_resp->init.data[0] = 0;
     res_APDU = ctap_resp->init.data + 1;
     res_APDU_size = 0;
-    return 1;
+    return 2; // CBOR processing
 }
 
-CborError COSE_key_params(int crv,
-                          int alg,
-                          mbedtls_ecp_group *grp,
-                          mbedtls_ecp_point *Q,
-                          CborEncoder *mapEncoderParent,
-                          CborEncoder *mapEncoder) {
+CborError COSE_key_params(int crv, int alg, mbedtls_ecp_group *grp, mbedtls_ecp_point *Q, CborEncoder *mapEncoderParent, CborEncoder *mapEncoder) {
     CborError error = CborNoError;
     int kty = 1;
     if (crv == FIDO2_CURVE_P256 || crv == FIDO2_CURVE_P384 || crv == FIDO2_CURVE_P521 ||
@@ -214,12 +211,7 @@ CborError COSE_key_shared(mbedtls_ecdh_context *key,
                           CborEncoder *mapEncoderParent,
                           CborEncoder *mapEncoder) {
     int crv = mbedtls_curve_to_fido(key->ctx.mbed_ecdh.grp.id), alg = FIDO2_ALG_ECDH_ES_HKDF_256;
-    return COSE_key_params(crv,
-                           alg,
-                           &key->ctx.mbed_ecdh.grp,
-                           &key->ctx.mbed_ecdh.Q,
-                           mapEncoderParent,
-                           mapEncoder);
+    return COSE_key_params(crv, alg, &key->ctx.mbed_ecdh.grp, &key->ctx.mbed_ecdh.Q, mapEncoderParent, mapEncoder);
 }
 CborError COSE_public_key(int alg, CborEncoder *mapEncoderParent, CborEncoder *mapEncoder) {
     CborError error = CborNoError;
@@ -232,12 +224,7 @@ CborError COSE_public_key(int alg, CborEncoder *mapEncoderParent, CborEncoder *m
 err:
     return error;
 }
-CborError COSE_read_key(CborValue *f,
-                        int64_t *kty,
-                        int64_t *alg,
-                        int64_t *crv,
-                        CborByteString *kax,
-                        CborByteString *kay) {
+CborError COSE_read_key(CborValue *f, int64_t *kty, int64_t *alg, int64_t *crv, CborByteString *kax, CborByteString *kay) {
     int64_t kkey = 0;
     CborError error = CborNoError;
     CBOR_PARSE_MAP_START(*f, 0)

src/fido/cbor_client_pin.c

@@ -15,7 +15,11 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
+#ifndef ESP_PLATFORM
 #include "common.h"
+#else
+#define MBEDTLS_ALLOW_PRIVATE_ACCESS
+#endif
 #include "mbedtls/ecp.h"
 #include "mbedtls/ecdh.h"
 #include "mbedtls/sha256.h"
@@ -23,7 +27,7 @@
 #include "cbor.h"
 #include "ctap.h"
 #include "ctap2_cbor.h"
-#ifndef ENABLE_EMULATION
+#if !defined(ENABLE_EMULATION) && !defined(ESP_PLATFORM)
 #include "bsp/board.h"
 #endif
 #include "hid/ctap_hid.h"
@@ -178,7 +182,7 @@ int resetPinUvAuthToken() {
     return 0;
 }
 
-int encrypt(uint8_t protocol, const uint8_t *key, const uint8_t *in, size_t in_len, uint8_t *out) {
+int encrypt(uint8_t protocol, const uint8_t *key, const uint8_t *in, uint16_t in_len, uint8_t *out) {
     if (protocol == 1) {
         memcpy(out, in, in_len);
         return aes_encrypt(key, NULL, 32 * 8, PICO_KEYS_AES_MODE_CBC, out, in_len);
@@ -192,13 +196,13 @@ int encrypt(uint8_t protocol, const uint8_t *key, const uint8_t *in, size_t in_l
     return -1;
 }
 
-int decrypt(uint8_t protocol, const uint8_t *key, const uint8_t *in, size_t in_len, uint8_t *out) {
+int decrypt(uint8_t protocol, const uint8_t *key, const uint8_t *in, uint16_t in_len, uint8_t *out) {
     if (protocol == 1) {
         memcpy(out, in, in_len);
         return aes_decrypt(key, NULL, 32 * 8, PICO_KEYS_AES_MODE_CBC, out, in_len);
     }
     else if (protocol == 2) {
-        memcpy(out, in + IV_SIZE, in_len);
+        memcpy(out, in + IV_SIZE, in_len - IV_SIZE);
         return aes_decrypt(key + 32, in, 32 * 8, PICO_KEYS_AES_MODE_CBC, out, in_len - IV_SIZE);
     }
 
@@ -228,12 +232,11 @@ int authenticate(uint8_t protocol,
     return 0;
 }
 
-int verify(uint8_t protocol, const uint8_t *key, const uint8_t *data, size_t len, uint8_t *sign) {
+int verify(uint8_t protocol, const uint8_t *key, const uint8_t *data, uint16_t len, uint8_t *sign) {
     uint8_t hmac[32];
     //if (paut.in_use == false)
     //    return -2;
-    int ret =
-        mbedtls_md_hmac(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), key, 32, data, len, hmac);
+    int ret = mbedtls_md_hmac(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), key, 32, data, len, hmac);
     if (ret != 0) {
         return ret;
     }
@@ -332,7 +335,7 @@ int cbor_client_pin(const uint8_t *data, size_t len) {
     }
     CBOR_PARSE_MAP_END(map, 1);
 
-    cbor_encoder_init(&encoder, ctap_resp->init.data + 1, CTAP_MAX_PACKET_SIZE, 0);
+    cbor_encoder_init(&encoder, ctap_resp->init.data + 1, CTAP_MAX_CBOR_PAYLOAD, 0);
     if (subcommand == 0x0) {
         CBOR_ERROR(CTAP2_ERR_MISSING_PARAMETER);
     }
@@ -382,18 +385,17 @@ int cbor_client_pin(const uint8_t *data, size_t len) {
             CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
         }
         uint8_t sharedSecret[64];
-        int ret = ecdh(pinUvAuthProtocol, &hkey.ctx.mbed_ecdh.Qp, sharedSecret);
+        int ret = ecdh((uint8_t)pinUvAuthProtocol, &hkey.ctx.mbed_ecdh.Qp, sharedSecret);
         if (ret != 0) {
             mbedtls_platform_zeroize(sharedSecret, sizeof(sharedSecret));
             CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
         }
-        if (verify(pinUvAuthProtocol, sharedSecret, newPinEnc.data, newPinEnc.len,
-                   pinUvAuthParam.data) != 0) {
+        if (verify((uint8_t)pinUvAuthProtocol, sharedSecret, newPinEnc.data, (uint16_t)newPinEnc.len, pinUvAuthParam.data) != 0) {
             mbedtls_platform_zeroize(sharedSecret, sizeof(sharedSecret));
             CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
         }
         uint8_t paddedNewPin[64];
-        ret = decrypt(pinUvAuthProtocol, sharedSecret, newPinEnc.data, newPinEnc.len, paddedNewPin);
+        ret = decrypt((uint8_t)pinUvAuthProtocol, sharedSecret, newPinEnc.data, (uint16_t)newPinEnc.len, paddedNewPin);
         mbedtls_platform_zeroize(sharedSecret, sizeof(sharedSecret));
         if (ret != 0) {
             CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
@@ -448,7 +450,7 @@ int cbor_client_pin(const uint8_t *data, size_t len) {
             CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
         }
         uint8_t sharedSecret[64];
-        int ret = ecdh(pinUvAuthProtocol, &hkey.ctx.mbed_ecdh.Qp, sharedSecret);
+        int ret = ecdh((uint8_t)pinUvAuthProtocol, &hkey.ctx.mbed_ecdh.Qp, sharedSecret);
         if (ret != 0) {
             mbedtls_platform_zeroize(sharedSecret, sizeof(sharedSecret));
             CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
@@ -456,8 +458,7 @@ int cbor_client_pin(const uint8_t *data, size_t len) {
         uint8_t tmp[80 + 32];
         memcpy(tmp, newPinEnc.data, newPinEnc.len);
         memcpy(tmp + newPinEnc.len, pinHashEnc.data, pinHashEnc.len);
-        if (verify(pinUvAuthProtocol, sharedSecret, tmp, newPinEnc.len + pinHashEnc.len,
-                   pinUvAuthParam.data) != 0) {
+        if (verify((uint8_t)pinUvAuthProtocol, sharedSecret, tmp, (uint16_t)(newPinEnc.len + pinHashEnc.len), pinUvAuthParam.data) != 0) {
             mbedtls_platform_zeroize(sharedSecret, sizeof(sharedSecret));
             CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
         }
@@ -468,8 +469,7 @@ int cbor_client_pin(const uint8_t *data, size_t len) {
         low_flash_available();
         uint8_t retries = pin_data[0];
         uint8_t paddedNewPin[64];
-        ret =
-            decrypt(pinUvAuthProtocol, sharedSecret, pinHashEnc.data, pinHashEnc.len, paddedNewPin);
+        ret = decrypt((uint8_t)pinUvAuthProtocol, sharedSecret, pinHashEnc.data, (uint16_t)pinHashEnc.len, paddedNewPin);
         if (ret != 0) {
             mbedtls_platform_zeroize(sharedSecret, sizeof(sharedSecret));
             CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
@@ -492,7 +492,7 @@ int cbor_client_pin(const uint8_t *data, size_t len) {
         file_put_data(ef_pin, pin_data, sizeof(pin_data));
         low_flash_available();
         new_pin_mismatches = 0;
-        ret = decrypt(pinUvAuthProtocol, sharedSecret, newPinEnc.data, newPinEnc.len, paddedNewPin);
+        ret = decrypt((uint8_t)pinUvAuthProtocol, sharedSecret, newPinEnc.data, (uint16_t)newPinEnc.len, paddedNewPin);
         mbedtls_platform_zeroize(sharedSecret, sizeof(sharedSecret));
         if (ret != 0) {
             CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
@@ -512,7 +512,7 @@ int cbor_client_pin(const uint8_t *data, size_t len) {
         if (pin_len < minPin) {
             CBOR_ERROR(CTAP2_ERR_PIN_POLICY_VIOLATION);
         }
-        uint8_t hsh[33];
+        uint8_t hsh[34];
         hsh[0] = MAX_PIN_RETRIES;
         hsh[1] = pin_len;
         mbedtls_md(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), paddedNewPin, pin_len, hsh + 2);
@@ -522,11 +522,11 @@ int cbor_client_pin(const uint8_t *data, size_t len) {
         }
         file_put_data(ef_pin, hsh, 2 + 16);
         if (file_has_data(ef_minpin) && file_get_data(ef_minpin)[1] == 1) {
-            uint8_t *tmp = (uint8_t *) calloc(1, file_get_size(ef_minpin));
-            memcpy(tmp, file_get_data(ef_minpin), file_get_size(ef_minpin));
-            tmp[1] = 0;
-            file_put_data(ef_minpin, tmp, file_get_size(ef_minpin));
-            free(tmp);
+            uint8_t *tmpf = (uint8_t *) calloc(1, file_get_size(ef_minpin));
+            memcpy(tmpf, file_get_data(ef_minpin), file_get_size(ef_minpin));
+            tmpf[1] = 0;
+            file_put_data(ef_minpin, tmpf, file_get_size(ef_minpin));
+            free(tmpf);
         }
         low_flash_available();
         resetPinUvAuthToken();
@@ -565,7 +565,7 @@ int cbor_client_pin(const uint8_t *data, size_t len) {
             CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
         }
         uint8_t sharedSecret[64];
-        int ret = ecdh(pinUvAuthProtocol, &hkey.ctx.mbed_ecdh.Qp, sharedSecret);
+        int ret = ecdh((uint8_t)pinUvAuthProtocol, &hkey.ctx.mbed_ecdh.Qp, sharedSecret);
         if (ret != 0) {
             mbedtls_platform_zeroize(sharedSecret, sizeof(sharedSecret));
             CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
@@ -576,9 +576,8 @@ int cbor_client_pin(const uint8_t *data, size_t len) {
         file_put_data(ef_pin, pin_data, sizeof(pin_data));
         low_flash_available();
         uint8_t retries = pin_data[0];
-        uint8_t paddedNewPin[64], poff = (pinUvAuthProtocol - 1) * IV_SIZE;
-        ret =
-            decrypt(pinUvAuthProtocol, sharedSecret, pinHashEnc.data, pinHashEnc.len, paddedNewPin);
+        uint8_t paddedNewPin[64], poff = ((uint8_t)pinUvAuthProtocol - 1) * IV_SIZE;
+        ret = decrypt((uint8_t)pinUvAuthProtocol, sharedSecret, pinHashEnc.data, (uint16_t)pinHashEnc.len, paddedNewPin);
         if (ret != 0) {
             mbedtls_platform_zeroize(sharedSecret, sizeof(sharedSecret));
             CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
@@ -610,7 +609,7 @@ int cbor_client_pin(const uint8_t *data, size_t len) {
         if (subcommand == 0x05) {
             permissions = CTAP_PERMISSION_MC | CTAP_PERMISSION_GA;
         }
-        paut.permissions = permissions;
+        paut.permissions = (uint8_t)permissions;
         if (rpId.present == true) {
             mbedtls_sha256((uint8_t *) rpId.data, rpId.len, paut.rp_id_hash, 0);
             paut.has_rp_id = true;
@@ -619,7 +618,7 @@ int cbor_client_pin(const uint8_t *data, size_t len) {
             paut.has_rp_id = false;
         }
         uint8_t pinUvAuthToken_enc[32 + IV_SIZE];
-        encrypt(pinUvAuthProtocol, sharedSecret, paut.data, 32, pinUvAuthToken_enc);
+        encrypt((uint8_t)pinUvAuthProtocol, sharedSecret, paut.data, 32, pinUvAuthToken_enc);
         CBOR_CHECK(cbor_encoder_create_map(&encoder, &mapEncoder, 1));
         CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x02));
         CBOR_CHECK(cbor_encode_byte_string(&mapEncoder, pinUvAuthToken_enc, 32 + poff));
@@ -642,6 +641,6 @@ err:
         }
         return error;
     }
-    res_APDU_size = resp_size;
+    res_APDU_size = (uint16_t)resp_size;
     return 0;
 }

src/fido/cbor_config.c

@@ -39,7 +39,8 @@ int cbor_config(const uint8_t *data, size_t len) {
     CborByteString pinUvAuthParam = { 0 }, vendorAutCt = { 0 };
     CborCharString minPinLengthRPIDs[32] = { 0 };
     size_t resp_size = 0, raw_subpara_len = 0, minPinLengthRPIDs_len = 0;
-    CborEncoder encoder, mapEncoder;
+    CborEncoder encoder;
+    //CborEncoder mapEncoder;
     uint8_t *raw_subpara = NULL;
     const bool *forceChangePin = NULL;
 
@@ -106,7 +107,7 @@ int cbor_config(const uint8_t *data, size_t len) {
     }
     CBOR_PARSE_MAP_END(map, 1);
 
-    cbor_encoder_init(&encoder, ctap_resp->init.data + 1, CTAP_MAX_PACKET_SIZE, 0);
+    cbor_encoder_init(&encoder, ctap_resp->init.data + 1, CTAP_MAX_CBOR_PAYLOAD, 0);
 
     if (pinUvAuthParam.present == false) {
         CBOR_ERROR(CTAP2_ERR_PUAT_REQUIRED);
@@ -118,13 +119,9 @@ int cbor_config(const uint8_t *data, size_t len) {
     uint8_t *verify_payload = (uint8_t *) calloc(1, 32 + 1 + 1 + raw_subpara_len);
     memset(verify_payload, 0xff, 32);
     verify_payload[32] = 0x0d;
-    verify_payload[33] = subcommand;
+    verify_payload[33] = (uint8_t)subcommand;
     memcpy(verify_payload + 34, raw_subpara, raw_subpara_len);
-    error = verify(pinUvAuthProtocol,
-                   paut.data,
-                   verify_payload,
-                   32 + 1 + 1 + raw_subpara_len,
-                   pinUvAuthParam.data);
+    error = verify((uint8_t)pinUvAuthProtocol, paut.data, verify_payload, (uint16_t)(32 + 1 + 1 + raw_subpara_len), pinUvAuthParam.data);
     free(verify_payload);
     if (error != CborNoError) {
         CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
@@ -165,14 +162,7 @@ int cbor_config(const uint8_t *data, size_t len) {
             random_gen(NULL, key_dev_enc, 12);
             mbedtls_chachapoly_init(&chatx);
             mbedtls_chachapoly_setkey(&chatx, vendorAutCt.data);
-            ret = mbedtls_chachapoly_encrypt_and_tag(&chatx,
-                                                     file_get_size(ef_keydev),
-                                                     key_dev_enc,
-                                                     NULL,
-                                                     0,
-                                                     file_get_data(ef_keydev),
-                                                     key_dev_enc + 12,
-                                                     key_dev_enc + 12 + file_get_size(ef_keydev));
+            ret = mbedtls_chachapoly_encrypt_and_tag(&chatx, file_get_size(ef_keydev), key_dev_enc, NULL, 0, file_get_data(ef_keydev), key_dev_enc + 12, key_dev_enc + 12 + file_get_size(ef_keydev));
             mbedtls_chachapoly_free(&chatx);
             if (ret != 0) {
                 CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
@@ -207,17 +197,15 @@ int cbor_config(const uint8_t *data, size_t len) {
         if (file_has_data(ef_pin) && file_get_data(ef_pin)[1] < newMinPinLength) {
             forceChangePin = ptrue;
         }
-        uint8_t *data = (uint8_t *) calloc(1, 2 + minPinLengthRPIDs_len * 32);
-        data[0] = newMinPinLength;
-        data[1] = forceChangePin == ptrue ? 1 : 0;
-        for (int m = 0; m < minPinLengthRPIDs_len; m++) {
-            mbedtls_sha256((uint8_t *) minPinLengthRPIDs[m].data,
-                           minPinLengthRPIDs[m].len,
-                           data + 2 + m * 32,
-                           0);
+        uint8_t *dataf = (uint8_t *) calloc(1, 2 + minPinLengthRPIDs_len * 32);
+        dataf[0] = (uint8_t)newMinPinLength;
+        dataf[1] = forceChangePin == ptrue ? 1 : 0;
+        for (size_t m = 0; m < minPinLengthRPIDs_len; m++) {
+            mbedtls_sha256((uint8_t *) minPinLengthRPIDs[m].data, minPinLengthRPIDs[m].len, dataf + 2 + m * 32, 0);
         }
-        file_put_data(ef_minpin, data, 2 + minPinLengthRPIDs_len * 32);
+        file_put_data(ef_minpin, dataf, (uint16_t)(2 + minPinLengthRPIDs_len * 32));
         low_flash_available();
+        free(dataf);
         goto err; //No return
     }
     else if (subcommand == 0x01) {
@@ -227,13 +215,13 @@ int cbor_config(const uint8_t *data, size_t len) {
     else {
         CBOR_ERROR(CTAP2_ERR_UNSUPPORTED_OPTION);
     }
-    CBOR_CHECK(cbor_encoder_close_container(&encoder, &mapEncoder));
-    resp_size = cbor_encoder_get_buffer_size(&encoder, ctap_resp->init.data + 1);
+    //CBOR_CHECK(cbor_encoder_close_container(&encoder, &mapEncoder));
+    //resp_size = cbor_encoder_get_buffer_size(&encoder, ctap_resp->init.data + 1);
 
 err:
     CBOR_FREE_BYTE_STRING(pinUvAuthParam);
     CBOR_FREE_BYTE_STRING(vendorAutCt);
-    for (int i = 0; i < minPinLengthRPIDs_len; i++) {
+    for (size_t i = 0; i < minPinLengthRPIDs_len; i++) {
         CBOR_FREE_BYTE_STRING(minPinLengthRPIDs[i]);
     }
 
@@ -243,6 +231,6 @@ err:
         }
         return error;
     }
-    res_APDU_size = resp_size;
+    res_APDU_size = (uint16_t)resp_size;
     return 0;
 }

src/fido/cbor_cred_mgmt.c

@@ -120,10 +120,9 @@ int cbor_cred_mgmt(const uint8_t *data, size_t len) {
         }
     }
 
-    cbor_encoder_init(&encoder, ctap_resp->init.data + 1, CTAP_MAX_PACKET_SIZE, 0);
+    cbor_encoder_init(&encoder, ctap_resp->init.data + 1, CTAP_MAX_CBOR_PAYLOAD, 0);
     if (subcommand == 0x01) {
-        if (verify(pinUvAuthProtocol, paut.data, (const uint8_t *) "\x01", 1,
-                   pinUvAuthParam.data) != CborNoError) {
+        if (verify((uint8_t)pinUvAuthProtocol, paut.data, (const uint8_t *) "\x01", 1, pinUvAuthParam.data) != CborNoError) {
             CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
         }
         if (is_preview == false &&
@@ -132,7 +131,7 @@ int cbor_cred_mgmt(const uint8_t *data, size_t len) {
         }
         uint8_t existing = 0;
         for (int i = 0; i < MAX_RESIDENT_CREDENTIALS; i++) {
-            if (file_has_data(search_dynamic_file(EF_CRED + i))) {
+            if (file_has_data(search_dynamic_file((uint16_t)(EF_CRED + i)))) {
                 existing++;
             }
         }
@@ -145,12 +144,10 @@ int cbor_cred_mgmt(const uint8_t *data, size_t len) {
     else if (subcommand == 0x02 || subcommand == 0x03) {
         file_t *rp_ef = NULL;
         if (subcommand == 0x02) {
-            if (verify(pinUvAuthProtocol, paut.data, (const uint8_t *) "\x02", 1,
-                       pinUvAuthParam.data) != CborNoError) {
+            if (verify((uint8_t)pinUvAuthProtocol, paut.data, (const uint8_t *) "\x02", 1, pinUvAuthParam.data) != CborNoError) {
                 CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
             }
-            if (is_preview == false &&
-                (!(paut.permissions & CTAP_PERMISSION_CM) || paut.has_rp_id == true)) {
+            if (is_preview == false && (!(paut.permissions & CTAP_PERMISSION_CM) || paut.has_rp_id == true)) {
                 CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
             }
             rp_counter = 1;
@@ -163,7 +160,7 @@ int cbor_cred_mgmt(const uint8_t *data, size_t len) {
         }
         uint8_t skip = 0;
         for (int i = 0; i < MAX_RESIDENT_CREDENTIALS; i++) {
-            file_t *tef = search_dynamic_file(EF_RP + i);
+            file_t *tef = search_dynamic_file((uint16_t)(EF_RP + i));
             if (file_has_data(tef) && *file_get_data(tef) > 0) {
                 if (++skip == rp_counter) {
                     if (rp_ef == NULL) {
@@ -202,8 +199,7 @@ int cbor_cred_mgmt(const uint8_t *data, size_t len) {
         }
         if (subcommand == 0x04) {
             *(raw_subpara - 1) = 0x04;
-            if (verify(pinUvAuthProtocol, paut.data, raw_subpara - 1, raw_subpara_len + 1,
-                       pinUvAuthParam.data) != CborNoError) {
+            if (verify((uint8_t)pinUvAuthProtocol, paut.data, raw_subpara - 1, (uint16_t)(raw_subpara_len + 1), pinUvAuthParam.data) != CborNoError) {
                 CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
             }
             if (is_preview == false &&
@@ -223,7 +219,7 @@ int cbor_cred_mgmt(const uint8_t *data, size_t len) {
         file_t *cred_ef = NULL;
         uint8_t skip = 0;
         for (int i = 0; i < MAX_RESIDENT_CREDENTIALS; i++) {
-            file_t *tef = search_dynamic_file(EF_CRED + i);
+            file_t *tef = search_dynamic_file((uint16_t)(EF_CRED + i));
             if (file_has_data(tef) && memcmp(file_get_data(tef), rpIdHash.data, 32) == 0) {
                 if (++skip == cred_counter) {
                     if (cred_ef == NULL) {
@@ -243,14 +239,13 @@ int cbor_cred_mgmt(const uint8_t *data, size_t len) {
         }
 
         Credential cred = { 0 };
-        if (credential_load(file_get_data(cred_ef) + 32, file_get_size(cred_ef) - 32, rpIdHash.data,
-                            &cred) != 0) {
+        if (credential_load(file_get_data(cred_ef) + 32, file_get_size(cred_ef) - 32, rpIdHash.data, &cred) != 0) {
             CBOR_ERROR(CTAP2_ERR_NOT_ALLOWED);
         }
 
         mbedtls_ecdsa_context key;
         mbedtls_ecdsa_init(&key);
-        if (fido_load_key(cred.curve, cred.id.data, &key) != 0) {
+        if (fido_load_key((int)cred.curve, cred.id.data, &key) != 0) {
             credential_free(&cred);
             mbedtls_ecdsa_free(&key);
             CBOR_ERROR(CTAP2_ERR_NOT_ALLOWED);
@@ -290,13 +285,11 @@ int cbor_cred_mgmt(const uint8_t *data, size_t len) {
         }
         if (cred.userName.present == true) {
             CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "name"));
-            CBOR_CHECK(cbor_encode_text_string(&mapEncoder2, cred.userName.data,
-                                               cred.userName.len));
+            CBOR_CHECK(cbor_encode_text_string(&mapEncoder2, cred.userName.data, cred.userName.len));
         }
         if (cred.userDisplayName.present == true) {
             CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "displayName"));
-            CBOR_CHECK(cbor_encode_text_string(&mapEncoder2, cred.userDisplayName.data,
-                                               cred.userDisplayName.len));
+            CBOR_CHECK(cbor_encode_text_string(&mapEncoder2, cred.userDisplayName.data, cred.userDisplayName.len));
         }
         CBOR_CHECK(cbor_encoder_close_container(&mapEncoder, &mapEncoder2));
 
@@ -331,13 +324,11 @@ int cbor_cred_mgmt(const uint8_t *data, size_t len) {
                     CBOR_ERROR(CTAP2_ERR_PROCESSING);
                 }
                 CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x0B));
-                CBOR_CHECK(cbor_encode_byte_string(&mapEncoder, largeBlobKey,
-                                                   sizeof(largeBlobKey)));
+                CBOR_CHECK(cbor_encode_byte_string(&mapEncoder, largeBlobKey, sizeof(largeBlobKey)));
                 mbedtls_platform_zeroize(largeBlobKey, sizeof(largeBlobKey));
             }
             CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x0C));
-            CBOR_CHECK(cbor_encode_boolean(&mapEncoder,
-                                           cred.extensions.thirdPartyPayment == ptrue));
+            CBOR_CHECK(cbor_encode_boolean(&mapEncoder, cred.extensions.thirdPartyPayment == ptrue));
         }
         else {
             CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x0C));
@@ -351,8 +342,7 @@ int cbor_cred_mgmt(const uint8_t *data, size_t len) {
             CBOR_ERROR(CTAP2_ERR_MISSING_PARAMETER);
         }
         *(raw_subpara - 1) = 0x06;
-        if (verify(pinUvAuthProtocol, paut.data, raw_subpara - 1, raw_subpara_len + 1,
-                   pinUvAuthParam.data) != CborNoError) {
+        if (verify((uint8_t)pinUvAuthProtocol, paut.data, raw_subpara - 1, (uint16_t)(raw_subpara_len + 1), pinUvAuthParam.data) != CborNoError) {
             CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
         }
         if (is_preview == false &&
@@ -361,18 +351,15 @@ int cbor_cred_mgmt(const uint8_t *data, size_t len) {
             CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
         }
         for (int i = 0; i < MAX_RESIDENT_CREDENTIALS; i++) {
-            file_t *ef = search_dynamic_file(EF_CRED + i);
-            if (file_has_data(ef) &&
-                memcmp(file_get_data(ef) + 32, credentialId.id.data,
-                       MIN(file_get_size(ef) - 32, credentialId.id.len)) == 0) {
+            file_t *ef = search_dynamic_file((uint16_t)(EF_CRED + i));
+            if (file_has_data(ef) && memcmp(file_get_data(ef) + 32, credentialId.id.data, MIN(file_get_size(ef) - 32, credentialId.id.len)) == 0) {
                 uint8_t *rp_id_hash = file_get_data(ef);
                 if (delete_file(ef) != 0) {
                     CBOR_ERROR(CTAP2_ERR_NOT_ALLOWED);
                 }
                 for (int j = 0; j < MAX_RESIDENT_CREDENTIALS; j++) {
-                    file_t *rp_ef = search_dynamic_file(EF_RP + j);
-                    if (file_has_data(rp_ef) &&
-                        memcmp(file_get_data(rp_ef) + 1, rp_id_hash, 32) == 0) {
+                    file_t *rp_ef = search_dynamic_file((uint16_t)(EF_RP + j));
+                    if (file_has_data(rp_ef) && memcmp(file_get_data(rp_ef) + 1, rp_id_hash, 32) == 0) {
                         uint8_t *rp_data = (uint8_t *) calloc(1, file_get_size(rp_ef));
                         memcpy(rp_data, file_get_data(rp_ef), file_get_size(rp_ef));
                         rp_data[0] -= 1;
@@ -397,8 +384,7 @@ int cbor_cred_mgmt(const uint8_t *data, size_t len) {
             CBOR_ERROR(CTAP2_ERR_MISSING_PARAMETER);
         }
         *(raw_subpara - 1) = 0x07;
-        if (verify(pinUvAuthProtocol, paut.data, raw_subpara - 1, raw_subpara_len + 1,
-                   pinUvAuthParam.data) != CborNoError) {
+        if (verify((uint8_t)pinUvAuthProtocol, paut.data, raw_subpara - 1, (uint16_t)(raw_subpara_len + 1), pinUvAuthParam.data) != CborNoError) {
             CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
         }
         if (is_preview == false &&
@@ -407,18 +393,14 @@ int cbor_cred_mgmt(const uint8_t *data, size_t len) {
             CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
         }
         for (int i = 0; i < MAX_RESIDENT_CREDENTIALS; i++) {
-            file_t *ef = search_dynamic_file(EF_CRED + i);
-            if (file_has_data(ef) &&
-                memcmp(file_get_data(ef) + 32, credentialId.id.data,
-                       MIN(file_get_size(ef) - 32, credentialId.id.len)) == 0) {
+            file_t *ef = search_dynamic_file((uint16_t)(EF_CRED + i));
+            if (file_has_data(ef) && memcmp(file_get_data(ef) + 32, credentialId.id.data, MIN(file_get_size(ef) - 32, credentialId.id.len)) == 0) {
                 Credential cred = { 0 };
                 uint8_t *rp_id_hash = file_get_data(ef);
-                if (credential_load(rp_id_hash + 32, file_get_size(ef) - 32, rp_id_hash,
-                                    &cred) != 0) {
+                if (credential_load(rp_id_hash + 32, file_get_size(ef) - 32, rp_id_hash, &cred) != 0) {
                     CBOR_ERROR(CTAP2_ERR_NOT_ALLOWED);
                 }
-                if (memcmp(user.id.data, cred.userId.data,
-                           MIN(user.id.len, cred.userId.len)) != 0) {
+                if (memcmp(user.id.data, cred.userId.data, MIN(user.id.len, cred.userId.len)) != 0) {
                     credential_free(&cred);
                     CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
                 }
@@ -426,8 +408,8 @@ int cbor_cred_mgmt(const uint8_t *data, size_t len) {
                 size_t newcred_len = 0;
                 if (credential_create(&cred.rpId, &cred.userId, &user.parent.name,
                                       &user.displayName, &cred.opts, &cred.extensions,
-                                      cred.use_sign_count, cred.alg,
-                                      cred.curve, newcred, &newcred_len) != 0) {
+                                      cred.use_sign_count, (int)cred.alg,
+                                      (int)cred.curve, newcred, &newcred_len) != 0) {
                     credential_free(&cred);
                     CBOR_ERROR(CTAP2_ERR_NOT_ALLOWED);
                 }
@@ -453,7 +435,8 @@ err:
     CBOR_FREE_BYTE_STRING(user.displayName);
     CBOR_FREE_BYTE_STRING(user.parent.name);
     CBOR_FREE_BYTE_STRING(credentialId.type);
-    for (int n = 0; n < credentialId.transports_len; n++) {
+    CBOR_FREE_BYTE_STRING(credentialId.id);
+    for (size_t n = 0; n < credentialId.transports_len; n++) {
         CBOR_FREE_BYTE_STRING(credentialId.transports[n]);
     }
     if (error != CborNoError) {
@@ -462,6 +445,6 @@ err:
         }
         return error;
     }
-    res_APDU_size = resp_size;
+    res_APDU_size = (uint16_t)resp_size;
     return 0;
 }

src/fido/cbor_get_assertion.c

@@ -17,7 +17,7 @@
 
 #include "cbor.h"
 #include "ctap.h"
-#ifndef ENABLE_EMULATION
+#if !defined(ENABLE_EMULATION) && !defined(ESP_PLATFORM)
 #include "bsp/board.h"
 #endif
 #include "hid/ctap_hid.h"
@@ -43,6 +43,8 @@ uint8_t *datax = NULL;
 size_t lenx = 0;
 
 int cbor_get_next_assertion(const uint8_t *data, size_t len) {
+    (void) data;
+    (void) len;
     CborError error = CborNoError;
     if (credentialCounter >= numberOfCredentialsx) {
         CBOR_ERROR(CTAP2_ERR_NOT_ALLOWED);
@@ -201,7 +203,7 @@ int cbor_get_assertion(const uint8_t *data, size_t len, bool next) {
     }
 
     uint8_t flags = 0;
-    uint8_t rp_id_hash[32];
+    uint8_t rp_id_hash[32] = {0};
     mbedtls_sha256((uint8_t *) rpId.data, rpId.len, rp_id_hash, 0);
 
     bool resident = false;
@@ -250,11 +252,7 @@ int cbor_get_assertion(const uint8_t *data, size_t len, bool next) {
         }
 
         if (pinUvAuthParam.present == true) { //6.1
-            int ret = verify(pinUvAuthProtocol,
-                             paut.data,
-                             clientDataHash.data,
-                             clientDataHash.len,
-                             pinUvAuthParam.data);
+            int ret = verify((uint8_t)pinUvAuthProtocol, paut.data, clientDataHash.data, (uint16_t)clientDataHash.len, pinUvAuthParam.data);
             if (ret != CborNoError) {
                 CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
             }
@@ -282,15 +280,14 @@ int cbor_get_assertion(const uint8_t *data, size_t len, bool next) {
         }
 
         if (allowList_len > 0) {
-            for (int e = 0; e < allowList_len; e++) {
+            for (size_t e = 0; e < allowList_len; e++) {
                 if (allowList[e].type.present == false || allowList[e].id.present == false) {
                     CBOR_ERROR(CTAP2_ERR_MISSING_PARAMETER);
                 }
                 if (strcmp(allowList[e].type.data, "public-key") != 0) {
                     continue;
                 }
-                if (credential_load(allowList[e].id.data, allowList[e].id.len, rp_id_hash,
-                                    &creds[creds_len]) != 0) {
+                if (credential_load(allowList[e].id.data, allowList[e].id.len, rp_id_hash, &creds[creds_len]) != 0) {
                     CBOR_FREE_BYTE_STRING(allowList[e].id);
                     credential_free(&creds[creds_len]);
                 }
@@ -300,17 +297,12 @@ int cbor_get_assertion(const uint8_t *data, size_t len, bool next) {
             }
         }
         else {
-            for (int i = 0;
-                 i < MAX_RESIDENT_CREDENTIALS && creds_len < MAX_CREDENTIAL_COUNT_IN_LIST;
-                 i++) {
-                file_t *ef = search_dynamic_file(EF_CRED + i);
+            for (int i = 0; i < MAX_RESIDENT_CREDENTIALS && creds_len < MAX_CREDENTIAL_COUNT_IN_LIST; i++) {
+                file_t *ef = search_dynamic_file((uint16_t)(EF_CRED + i));
                 if (!file_has_data(ef) || memcmp(file_get_data(ef), rp_id_hash, 32) != 0) {
                     continue;
                 }
-                int ret = credential_load(file_get_data(ef) + 32,
-                                          file_get_size(ef) - 32,
-                                          rp_id_hash,
-                                          &creds[creds_len]);
+                int ret = credential_load(file_get_data(ef) + 32, file_get_size(ef) - 32, rp_id_hash,  &creds[creds_len]);
                 if (ret != 0) {
                     credential_free(&creds[creds_len]);
                 }
@@ -320,11 +312,10 @@ int cbor_get_assertion(const uint8_t *data, size_t len, bool next) {
             }
             resident = true;
         }
-        for (int i = 0; i < creds_len; i++) {
+        for (size_t i = 0; i < creds_len; i++) {
             if (creds[i].present == true) {
                 if (creds[i].extensions.present == true) {
-                    if (creds[i].extensions.credProtect == CRED_PROT_UV_REQUIRED &&
-                        !(flags & FIDO2_AUT_FLAG_UV)) {
+                    if (creds[i].extensions.credProtect == CRED_PROT_UV_REQUIRED && !(flags & FIDO2_AUT_FLAG_UV)) {
                         credential_free(&creds[i]);
                     }
                     else if (creds[i].extensions.credProtect == CRED_PROT_UV_OPTIONAL_WITH_LIST &&
@@ -332,11 +323,21 @@ int cbor_get_assertion(const uint8_t *data, size_t len, bool next) {
                         credential_free(&creds[i]);
                     }
                     else {
-                        creds[numberOfCredentials++] = creds[i];
+                        if (numberOfCredentials != i) {
+                            creds[numberOfCredentials++] = creds[i];
+                        }
+                        else {
+                            numberOfCredentials++;
+                        }
                     }
                 }
                 else {
-                    creds[numberOfCredentials++] = creds[i];
+                    if (numberOfCredentials != i) {
+                        creds[numberOfCredentials++] = creds[i];
+                    }
+                    else {
+                        numberOfCredentials++;
+                    }
                 }
             }
         }
@@ -406,17 +407,9 @@ int cbor_get_assertion(const uint8_t *data, size_t len, bool next) {
         flags = flagsx;
         selcred = &credsx[credentialCounter];
     }
-    mbedtls_ecdsa_context ekey;
-    mbedtls_ecdsa_init(&ekey);
-    int ret = fido_load_key(selcred->curve, selcred->id.data, &ekey);
-    if (ret != 0) {
-        if (derive_key(rp_id_hash, false, selcred->id.data, MBEDTLS_ECP_DP_SECP256R1, &ekey) != 0) {
-            mbedtls_ecdsa_free(&ekey);
-            CBOR_ERROR(CTAP1_ERR_OTHER);
-        }
-    }
 
-    uint8_t largeBlobKey[32];
+    int ret = 0;
+    uint8_t largeBlobKey[32] = {0};
     if (extensions.largeBlobKey == ptrue && selcred->extensions.largeBlobKey == ptrue) {
         ret = credential_derive_large_blob_key(selcred->id.data, selcred->id.len, largeBlobKey);
         if (ret != 0) {
@@ -425,7 +418,7 @@ int cbor_get_assertion(const uint8_t *data, size_t len, bool next) {
     }
 
     size_t ext_len = 0;
-    uint8_t ext[512];
+    uint8_t ext[512] = {0};
     if (extensions.present == true) {
         cbor_encoder_init(&encoder, ext, sizeof(ext), 0);
         int l = 0;
@@ -456,7 +449,7 @@ int cbor_get_assertion(const uint8_t *data, size_t len, bool next) {
 
             CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder, "hmac-secret"));
 
-            uint8_t sharedSecret[64];
+            uint8_t sharedSecret[64] = {0};
             mbedtls_ecp_point Qp;
             mbedtls_ecp_point_init(&Qp);
             mbedtls_mpi_lset(&Qp.Z, 1);
@@ -468,28 +461,23 @@ int cbor_get_assertion(const uint8_t *data, size_t len, bool next) {
                 mbedtls_ecp_point_free(&Qp);
                 CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
             }
-            int ret = ecdh(hmacSecretPinUvAuthProtocol, &Qp, sharedSecret);
+            ret = ecdh((uint8_t)hmacSecretPinUvAuthProtocol, &Qp, sharedSecret);
             mbedtls_ecp_point_free(&Qp);
             if (ret != 0) {
                 mbedtls_platform_zeroize(sharedSecret, sizeof(sharedSecret));
                 CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
             }
-            if (verify(hmacSecretPinUvAuthProtocol, sharedSecret, salt_enc.data, salt_enc.len,
-                       salt_auth.data) != 0) {
+            if (verify((uint8_t)hmacSecretPinUvAuthProtocol, sharedSecret, salt_enc.data, (uint16_t)salt_enc.len, salt_auth.data) != 0) {
                 mbedtls_platform_zeroize(sharedSecret, sizeof(sharedSecret));
                 CBOR_ERROR(CTAP2_ERR_EXTENSION_FIRST);
             }
-            uint8_t salt_dec[64], poff = (hmacSecretPinUvAuthProtocol - 1) * IV_SIZE;
-            ret = decrypt(hmacSecretPinUvAuthProtocol,
-                          sharedSecret,
-                          salt_enc.data,
-                          salt_enc.len,
-                          salt_dec);
+            uint8_t salt_dec[64] = {0}, poff = ((uint8_t)hmacSecretPinUvAuthProtocol - 1) * IV_SIZE;
+            ret = decrypt((uint8_t)hmacSecretPinUvAuthProtocol, sharedSecret, salt_enc.data, (uint16_t)salt_enc.len, salt_dec);
             if (ret != 0) {
                 mbedtls_platform_zeroize(sharedSecret, sizeof(sharedSecret));
                 CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
             }
-            uint8_t cred_random[64], *crd = NULL;
+            uint8_t cred_random[64] = {0}, *crd = NULL;
             ret = credential_derive_hmac_key(selcred->id.data, selcred->id.len, cred_random);
             if (ret != 0) {
                 mbedtls_platform_zeroize(sharedSecret, sizeof(sharedSecret));
@@ -501,22 +489,12 @@ int cbor_get_assertion(const uint8_t *data, size_t len, bool next) {
             else {
                 crd = cred_random;
             }
-            uint8_t out1[64], hmac_res[80];
-            mbedtls_md_hmac(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
-                            crd,
-                            32,
-                            salt_dec,
-                            32,
-                            out1);
-            if (salt_enc.len == 64 + poff) {
-                mbedtls_md_hmac(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
-                                crd,
-                                32,
-                                salt_dec + 32,
-                                32,
-                                out1 + 32);
+            uint8_t out1[64] = {0}, hmac_res[80] = {0};
+            mbedtls_md_hmac(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), crd, 32, salt_dec, 32, out1);
+            if ((uint8_t)salt_enc.len == 64 + poff) {
+                mbedtls_md_hmac(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), crd, 32, salt_dec + 32, 32, out1 + 32);
             }
-            encrypt(hmacSecretPinUvAuthProtocol, sharedSecret, out1, salt_enc.len - poff, hmac_res);
+            encrypt((uint8_t)hmacSecretPinUvAuthProtocol, sharedSecret, out1, (uint16_t)(salt_enc.len - poff), hmac_res);
             CBOR_CHECK(cbor_encode_byte_string(&mapEncoder, hmac_res, salt_enc.len));
         }
         if (extensions.thirdPartyPayment != NULL) {
@@ -541,38 +519,36 @@ int cbor_get_assertion(const uint8_t *data, size_t len, bool next) {
     uint8_t *pa = aut_data;
     memcpy(pa, rp_id_hash, 32); pa += 32;
     *pa++ = flags;
-    *pa++ = ctr >> 24;
-    *pa++ = ctr >> 16;
-    *pa++ = ctr >> 8;
-    *pa++ = ctr & 0xff;
+    *pa++ = (ctr >> 24) & 0xFF;
+    *pa++ = (ctr >> 16) & 0xFF;
+    *pa++ = (ctr >> 8) & 0xFF;
+    *pa++ = ctr & 0xFF;
     memcpy(pa, ext, ext_len); pa += ext_len;
-    if (pa - aut_data != aut_data_len) {
+    if ((size_t)(pa - aut_data) != aut_data_len) {
         CBOR_ERROR(CTAP1_ERR_OTHER);
     }
 
     memcpy(pa, clientDataHash.data, clientDataHash.len);
-    uint8_t hash[64], sig[MBEDTLS_ECDSA_MAX_LEN];
+    uint8_t hash[64] = {0}, sig[MBEDTLS_ECDSA_MAX_LEN] = {0};
     const mbedtls_md_info_t *md = mbedtls_md_info_from_type(MBEDTLS_MD_SHA256);
+    mbedtls_ecdsa_context ekey;
+    mbedtls_ecdsa_init(&ekey);
+    ret = fido_load_key((int)selcred->curve, selcred->id.data, &ekey);
+    if (ret != 0) {
+        if (derive_key(rp_id_hash, false, selcred->id.data, MBEDTLS_ECP_DP_SECP256R1, &ekey) != 0) {
+            mbedtls_ecdsa_free(&ekey);
+            CBOR_ERROR(CTAP1_ERR_OTHER);
+        }
+    }
     if (ekey.grp.id == MBEDTLS_ECP_DP_SECP384R1) {
         md = mbedtls_md_info_from_type(MBEDTLS_MD_SHA384);
     }
     else if (ekey.grp.id == MBEDTLS_ECP_DP_SECP521R1) {
         md = mbedtls_md_info_from_type(MBEDTLS_MD_SHA512);
     }
-    ret = mbedtls_md(md,
-                     aut_data,
-                     aut_data_len + clientDataHash.len,
-                     hash);
+    ret = mbedtls_md(md, aut_data, aut_data_len + clientDataHash.len, hash);
     size_t olen = 0;
-    ret = mbedtls_ecdsa_write_signature(&ekey,
-                                        mbedtls_md_get_type(md),
-                                        hash,
-                                        mbedtls_md_get_size(md),
-                                        sig,
-                                        sizeof(sig),
-                                        &olen,
-                                        random_gen,
-                                        NULL);
+    ret = mbedtls_ecdsa_write_signature(&ekey, mbedtls_md_get_type(md), hash, mbedtls_md_get_size(md), sig, sizeof(sig), &olen, random_gen, NULL);
     mbedtls_ecdsa_free(&ekey);
 
     uint8_t lfields = 3;
@@ -585,7 +561,7 @@ int cbor_get_assertion(const uint8_t *data, size_t len, bool next) {
     if (extensions.largeBlobKey == ptrue && selcred->extensions.largeBlobKey == ptrue) {
         lfields++;
     }
-    cbor_encoder_init(&encoder, ctap_resp->init.data + 1, CTAP_MAX_PACKET_SIZE, 0);
+    cbor_encoder_init(&encoder, ctap_resp->init.data + 1, CTAP_MAX_CBOR_PAYLOAD, 0);
     CBOR_CHECK(cbor_encoder_create_map(&encoder, &mapEncoder, lfields));
 
     CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x01));
@@ -646,16 +622,20 @@ err:
     CBOR_FREE_BYTE_STRING(clientDataHash);
     CBOR_FREE_BYTE_STRING(pinUvAuthParam);
     CBOR_FREE_BYTE_STRING(rpId);
+    CBOR_FREE_BYTE_STRING(kax);
+    CBOR_FREE_BYTE_STRING(kay);
+    CBOR_FREE_BYTE_STRING(salt_enc);
+    CBOR_FREE_BYTE_STRING(salt_auth);
     if (asserted == false) {
         for (int i = 0; i < MAX_CREDENTIAL_COUNT_IN_LIST; i++) {
             credential_free(&creds[i]);
         }
     }
 
-    for (int m = 0; m < allowList_len; m++) {
+    for (size_t m = 0; m < MAX_CREDENTIAL_COUNT_IN_LIST; m++) {
         CBOR_FREE_BYTE_STRING(allowList[m].type);
         CBOR_FREE_BYTE_STRING(allowList[m].id);
-        for (int n = 0; n < allowList[m].transports_len; n++) {
+        for (size_t n = 0; n < 8; n++) {
             CBOR_FREE_BYTE_STRING(allowList[m].transports[n]);
         }
     }
@@ -668,6 +648,6 @@ err:
         }
         return error;
     }
-    res_APDU_size = resp_size;
+    res_APDU_size = (uint16_t)resp_size;
     return 0;
 }

src/fido/cbor_get_info.c

@@ -26,7 +26,7 @@
 int cbor_get_info() {
     CborEncoder encoder, mapEncoder, arrayEncoder, mapEncoder2;
     CborError error = CborNoError;
-    cbor_encoder_init(&encoder, ctap_resp->init.data + 1, CTAP_MAX_PACKET_SIZE, 0);
+    cbor_encoder_init(&encoder, ctap_resp->init.data + 1, CTAP_MAX_CBOR_PAYLOAD, 0);
     CBOR_CHECK(cbor_encoder_create_map(&encoder, &mapEncoder, 15));
 
     CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x01));
@@ -133,6 +133,6 @@ err:
     if (error != CborNoError) {
         return -CTAP2_ERR_INVALID_CBOR;
     }
-    res_APDU_size = cbor_encoder_get_buffer_size(&encoder, res_APDU + 1);
+    res_APDU_size = (uint16_t)cbor_encoder_get_buffer_size(&encoder, ctap_resp->init.data + 1);
     return 0;
 }

src/fido/cbor_large_blobs.c

@@ -79,7 +79,7 @@ int cbor_large_blobs(const uint8_t *data, size_t len) {
         CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
     }
 
-    cbor_encoder_init(&encoder, ctap_resp->init.data + 1, CTAP_MAX_PACKET_SIZE, 0);
+    cbor_encoder_init(&encoder, ctap_resp->init.data + 1, CTAP_MAX_CBOR_PAYLOAD, 0);
     if (get > 0) {
         if (length != 0) {
             CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
@@ -129,13 +129,12 @@ int cbor_large_blobs(const uint8_t *data, size_t len) {
         uint8_t verify_data[70] = { 0 };
         memset(verify_data, 0xff, 32);
         verify_data[32] = 0x0C;
-        verify_data[34] = offset & 0xff;
-        verify_data[35] = offset >> 8;
-        verify_data[36] = offset >> 16;
-        verify_data[37] = offset >> 24;
+        verify_data[34] = offset & 0xFF;
+        verify_data[35] = (offset >> 8) & 0xFF;
+        verify_data[36] = (offset >> 16) & 0xFF;
+        verify_data[37] = (offset >> 24) & 0xFF;
         mbedtls_sha256(set.data, set.len, verify_data + 38, 0);
-        if (verify(pinUvAuthProtocol, paut.data, verify_data, sizeof(verify_data),
-                   pinUvAuthParam.data) != 0) {
+        if (verify((uint8_t)pinUvAuthProtocol, paut.data, verify_data, (uint16_t)sizeof(verify_data), pinUvAuthParam.data) != 0) {
             CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
         }
         if (!(paut.permissions & CTAP_PERMISSION_LBW)) {
@@ -155,7 +154,7 @@ int cbor_large_blobs(const uint8_t *data, size_t len) {
             if (expectedLength > 17 && memcmp(sha, temp_lba + expectedLength - 16, 16) != 0) {
                 CBOR_ERROR(CTAP2_ERR_INTEGRITY_FAILURE);
             }
-            file_put_data(ef_largeblob, temp_lba, expectedLength);
+            file_put_data(ef_largeblob, temp_lba, (uint16_t)expectedLength);
             low_flash_available();
         }
         goto err;
@@ -168,6 +167,6 @@ err:
     if (error != CborNoError) {
         return -CTAP2_ERR_INVALID_CBOR;
     }
-    res_APDU_size = cbor_encoder_get_buffer_size(&encoder, res_APDU + 1);
+    res_APDU_size = (uint16_t)cbor_encoder_get_buffer_size(&encoder, ctap_resp->init.data + 1);
     return 0;
 }

src/fido/cbor_make_credential.c

@@ -162,7 +162,7 @@ int cbor_make_credential(const uint8_t *data, size_t len) {
     CBOR_PARSE_MAP_END(map, 1);
 
     uint8_t flags = FIDO2_AUT_FLAG_AT;
-    uint8_t rp_id_hash[32];
+    uint8_t rp_id_hash[32] = {0};
     mbedtls_sha256((uint8_t *) rp.id.data, rp.id.len, rp_id_hash, 0);
 
     if (pinUvAuthParam.present == true) {
@@ -192,7 +192,7 @@ int cbor_make_credential(const uint8_t *data, size_t len) {
         CBOR_ERROR(CTAP2_ERR_MISSING_PARAMETER);
     }
 
-    for (int i = 0; i < pubKeyCredParams_len; i++) {
+    for (unsigned int i = 0; i < pubKeyCredParams_len; i++) {
         if (pubKeyCredParams[i].type.present == false) {
             CBOR_ERROR(CTAP2_ERR_INVALID_CBOR);
         }
@@ -229,7 +229,7 @@ int cbor_make_credential(const uint8_t *data, size_t len) {
         //    CBOR_ERROR(CTAP2_ERR_CBOR_UNEXPECTED_TYPE);
         //}
         if (curve > 0 && alg == 0) {
-            alg = pubKeyCredParams[i].alg;
+            alg = (int)pubKeyCredParams[i].alg;
         }
     }
     if (curve <= 0) {
@@ -259,11 +259,7 @@ int cbor_make_credential(const uint8_t *data, size_t len) {
         //Unfinished. See 6.1.2.9
     }
     if (pinUvAuthParam.present == true) { //11.1
-        int ret = verify(pinUvAuthProtocol,
-                         paut.data,
-                         clientDataHash.data,
-                         clientDataHash.len,
-                         pinUvAuthParam.data);
+        int ret = verify((uint8_t)pinUvAuthProtocol, paut.data, clientDataHash.data, (uint16_t)clientDataHash.len, pinUvAuthParam.data);
         if (ret != CborNoError) {
             CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
         }
@@ -283,11 +279,11 @@ int cbor_make_credential(const uint8_t *data, size_t len) {
         }
     }
 
-    for (int e = 0; e < excludeList_len; e++) { //12.1
+    for (size_t e = 0; e < excludeList_len; e++) { //12.1
         if (excludeList[e].type.present == false || excludeList[e].id.present == false) {
             CBOR_ERROR(CTAP2_ERR_MISSING_PARAMETER);
         }
-        if (strcmp(excludeList[e].type.data, "public-key") != 0) {
+        if (strcmp(excludeList[e].type.data, (char *)"public-key") != 0) {
             continue;
         }
         Credential ecred;
@@ -295,8 +291,10 @@ int cbor_make_credential(const uint8_t *data, size_t len) {
                             &ecred) == 0 &&
             (ecred.extensions.credProtect != CRED_PROT_UV_REQUIRED ||
              (flags & FIDO2_AUT_FLAG_UV))) {
+                credential_free(&ecred);
             CBOR_ERROR(CTAP2_ERR_CREDENTIAL_EXCLUDED);
         }
+        credential_free(&ecred);
     }
 
     if (extensions.largeBlobKey == pfalse ||
@@ -322,7 +320,7 @@ int cbor_make_credential(const uint8_t *data, size_t len) {
 
     const known_app_t *ka = find_app_by_rp_id_hash(rp_id_hash);
 
-    uint8_t cred_id[MAX_CRED_ID_LENGTH];
+    uint8_t cred_id[MAX_CRED_ID_LENGTH] = {0};
     size_t cred_id_len = 0;
 
     CBOR_CHECK(credential_create(&rp.id, &user.id, &user.parent.name, &user.displayName, &options,
@@ -333,7 +331,7 @@ int cbor_make_credential(const uint8_t *data, size_t len) {
         flags |= FIDO2_AUT_FLAG_UV;
     }
     size_t ext_len = 0;
-    uint8_t ext[512];
+    uint8_t ext[512] = {0};
     CborEncoder encoder, mapEncoder, mapEncoder2;
     if (extensions.present == true) {
         cbor_encoder_init(&encoder, ext, sizeof(ext), 0);
@@ -402,7 +400,7 @@ int cbor_make_credential(const uint8_t *data, size_t len) {
     }
     size_t olen = 0;
     uint32_t ctr = get_sign_counter();
-    uint8_t cbor_buf[1024];
+    uint8_t cbor_buf[1024] = {0};
     cbor_encoder_init(&encoder, cbor_buf, sizeof(cbor_buf), 0);
     CBOR_CHECK(COSE_key(&ekey, &encoder, &mapEncoder));
     size_t rs = cbor_encoder_get_buffer_size(&encoder, cbor_buf);
@@ -412,23 +410,23 @@ int cbor_make_credential(const uint8_t *data, size_t len) {
     uint8_t *pa = aut_data;
     memcpy(pa, rp_id_hash, 32); pa += 32;
     *pa++ = flags;
-    *pa++ = ctr >> 24;
-    *pa++ = ctr >> 16;
-    *pa++ = ctr >> 8;
-    *pa++ = ctr & 0xff;
+    *pa++ = (ctr >> 24) & 0xFF;
+    *pa++ = (ctr >> 16) & 0xFF;
+    *pa++ = (ctr >> 8) & 0xFF;
+    *pa++ = ctr & 0xFF;
     memcpy(pa, aaguid, 16); pa += 16;
-    *pa++ = cred_id_len >> 8;
-    *pa++ = cred_id_len & 0xff;
-    memcpy(pa, cred_id, cred_id_len); pa += cred_id_len;
-    memcpy(pa, cbor_buf, rs); pa += rs;
-    memcpy(pa, ext, ext_len); pa += ext_len;
-    if (pa - aut_data != aut_data_len) {
+    *pa++ = ((uint16_t)cred_id_len >> 8) & 0xFF;
+    *pa++ = (uint16_t)cred_id_len & 0xFF;
+    memcpy(pa, cred_id, cred_id_len); pa += (uint16_t)cred_id_len;
+    memcpy(pa, cbor_buf, rs); pa += (uint16_t)rs;
+    memcpy(pa, ext, ext_len); pa += (uint16_t)ext_len;
+    if ((size_t)(pa - aut_data) != aut_data_len) {
         mbedtls_ecdsa_free(&ekey);
         CBOR_ERROR(CTAP1_ERR_OTHER);
     }
 
     memcpy(pa, clientDataHash.data, clientDataHash.len);
-    uint8_t hash[64], sig[MBEDTLS_ECDSA_MAX_LEN];
+    uint8_t hash[64] = {0}, sig[MBEDTLS_ECDSA_MAX_LEN] = {0};
     const mbedtls_md_info_t *md = mbedtls_md_info_from_type(MBEDTLS_MD_SHA256);
     if (ekey.grp.id == MBEDTLS_ECP_DP_SECP384R1) {
         md = mbedtls_md_info_from_type(MBEDTLS_MD_SHA384);
@@ -436,31 +434,25 @@ int cbor_make_credential(const uint8_t *data, size_t len) {
     else if (ekey.grp.id == MBEDTLS_ECP_DP_SECP521R1) {
         md = mbedtls_md_info_from_type(MBEDTLS_MD_SHA512);
     }
-    ret = mbedtls_md(md,
-                     aut_data,
-                     aut_data_len + clientDataHash.len,
-                     hash);
+    ret = mbedtls_md(md, aut_data, aut_data_len + clientDataHash.len, hash);
 
     bool self_attestation = true;
     if (enterpriseAttestation == 2 || (ka && ka->use_self_attestation == pfalse)) {
         mbedtls_ecdsa_free(&ekey);
         mbedtls_ecdsa_init(&ekey);
-        ret = mbedtls_ecp_read_key(MBEDTLS_ECP_DP_SECP256R1, &ekey, file_get_data(ef_keydev), 32);
+        uint8_t key[32] = {0};
+        if (load_keydev(key) != 0) {
+            CBOR_ERROR(CTAP1_ERR_OTHER);
+        }
+        ret = mbedtls_ecp_read_key(MBEDTLS_ECP_DP_SECP256R1, &ekey, key, 32);
+        mbedtls_platform_zeroize(key, sizeof(key));
         md = mbedtls_md_info_from_type(MBEDTLS_MD_SHA256);
         self_attestation = false;
     }
-    ret = mbedtls_ecdsa_write_signature(&ekey,
-                                        mbedtls_md_get_type(md),
-                                        hash,
-                                        mbedtls_md_get_size(md),
-                                        sig,
-                                        sizeof(sig),
-                                        &olen,
-                                        random_gen,
-                                        NULL);
+    ret = mbedtls_ecdsa_write_signature(&ekey, mbedtls_md_get_type(md), hash, mbedtls_md_get_size(md), sig, sizeof(sig), &olen, random_gen, NULL);
     mbedtls_ecdsa_free(&ekey);
 
-    uint8_t largeBlobKey[32];
+    uint8_t largeBlobKey[32] = {0};
     if (extensions.largeBlobKey == ptrue && options.rk == ptrue) {
         ret = credential_derive_large_blob_key(cred_id, cred_id_len, largeBlobKey);
         if (ret != 0) {
@@ -468,10 +460,8 @@ int cbor_make_credential(const uint8_t *data, size_t len) {
         }
     }
 
-    cbor_encoder_init(&encoder, ctap_resp->init.data + 1, CTAP_MAX_PACKET_SIZE, 0);
-    CBOR_CHECK(cbor_encoder_create_map(&encoder, &mapEncoder,
-                                       extensions.largeBlobKey == ptrue &&
-                                       options.rk == ptrue ? 5 : 4));
+    cbor_encoder_init(&encoder, ctap_resp->init.data + 1, CTAP_MAX_CBOR_PAYLOAD, 0);
+    CBOR_CHECK(cbor_encoder_create_map(&encoder, &mapEncoder, extensions.largeBlobKey == ptrue && options.rk == ptrue ? 5 : 4));
 
     CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x01));
     CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder, "packed"));
@@ -479,11 +469,9 @@ int cbor_make_credential(const uint8_t *data, size_t len) {
     CBOR_CHECK(cbor_encode_byte_string(&mapEncoder, aut_data, aut_data_len));
     CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x03));
 
-    CBOR_CHECK(cbor_encoder_create_map(&mapEncoder, &mapEncoder2,
-                                       self_attestation == false || is_nitrokey ? 3 : 2));
+    CBOR_CHECK(cbor_encoder_create_map(&mapEncoder, &mapEncoder2, self_attestation == false || is_nitrokey ? 3 : 2));
     CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "alg"));
-    CBOR_CHECK(cbor_encode_negative_int(&mapEncoder2,
-                                        self_attestation || is_nitrokey ? -alg : -FIDO2_ALG_ES256));
+    CBOR_CHECK(cbor_encode_negative_int(&mapEncoder2, self_attestation || is_nitrokey ? -alg : -FIDO2_ALG_ES256));
     CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "sig"));
     CBOR_CHECK(cbor_encode_byte_string(&mapEncoder2, sig, olen));
     if (self_attestation == false || is_nitrokey) {
@@ -497,8 +485,7 @@ int cbor_make_credential(const uint8_t *data, size_t len) {
         }
         CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "x5c"));
         CBOR_CHECK(cbor_encoder_create_array(&mapEncoder2, &arrEncoder, 1));
-        CBOR_CHECK(cbor_encode_byte_string(&arrEncoder, file_get_data(ef_cert),
-                                           file_get_size(ef_cert)));
+        CBOR_CHECK(cbor_encode_byte_string(&arrEncoder, file_get_data(ef_cert), file_get_size(ef_cert)));
         CBOR_CHECK(cbor_encoder_close_container(&mapEncoder2, &arrEncoder));
     }
     CBOR_CHECK(cbor_encoder_close_container(&mapEncoder, &mapEncoder2));
@@ -530,14 +517,17 @@ err:
     CBOR_FREE_BYTE_STRING(user.id);
     CBOR_FREE_BYTE_STRING(user.displayName);
     CBOR_FREE_BYTE_STRING(user.parent.name);
-    for (int n = 0; n < pubKeyCredParams_len; n++) {
+    if (extensions.present == true) {
+        CBOR_FREE_BYTE_STRING(extensions.credBlob);
+    }
+    for (size_t n = 0; n < MAX_CREDENTIAL_COUNT_IN_LIST; n++) {
         CBOR_FREE_BYTE_STRING(pubKeyCredParams[n].type);
     }
 
-    for (int m = 0; m < excludeList_len; m++) {
+    for (size_t m = 0; m < MAX_CREDENTIAL_COUNT_IN_LIST; m++) {
         CBOR_FREE_BYTE_STRING(excludeList[m].type);
         CBOR_FREE_BYTE_STRING(excludeList[m].id);
-        for (int n = 0; n < excludeList[m].transports_len; n++) {
+        for (size_t n = 0; n < excludeList[m].transports_len; n++) {
             CBOR_FREE_BYTE_STRING(excludeList[m].transports[n]);
         }
     }
@@ -550,6 +540,6 @@ err:
         }
         return error;
     }
-    res_APDU_size = resp_size;
+    res_APDU_size = (uint16_t)resp_size;
     return 0;
 }

src/fido/cbor_reset.c

@@ -18,9 +18,12 @@
 #include "file.h"
 #include "fido.h"
 #include "ctap.h"
-#ifndef ENABLE_EMULATION
+#if !defined(ENABLE_EMULATION) && !defined(ESP_PLATFORM)
 #include "bsp/board.h"
 #endif
+#ifdef ESP_PLATFORM
+#include "esp_compat.h"
+#endif
 
 extern void scan_all();
 

src/fido/cbor_vendor.c

@@ -101,7 +101,7 @@ int cbor_vendor_generic(uint8_t cmd, const uint8_t *data, size_t len) {
     }
     CBOR_PARSE_MAP_END(map, 1);
 
-    cbor_encoder_init(&encoder, ctap_resp->init.data + 1, CTAP_MAX_PACKET_SIZE, 0);
+    cbor_encoder_init(&encoder, ctap_resp->init.data + 1, CTAP_MAX_CBOR_PAYLOAD, 0);
 
     if (cmd == CTAP_VENDOR_BACKUP) {
         if (vendorCmd == 0x01) {
@@ -121,7 +121,7 @@ int cbor_vendor_generic(uint8_t cmd, const uint8_t *data, size_t len) {
             }
             uint8_t zeros[32];
             memset(zeros, 0, sizeof(zeros));
-            file_put_data(ef_keydev_enc, vendorParam.data, vendorParam.len);
+            file_put_data(ef_keydev_enc, vendorParam.data, (uint16_t)vendorParam.len);
             file_put_data(ef_keydev, zeros, file_get_size(ef_keydev)); // Overwrite ef with 0
             file_put_data(ef_keydev, NULL, 0); // Set ef to 0 bytes
             low_flash_available();
@@ -223,14 +223,7 @@ int cbor_vendor_generic(uint8_t cmd, const uint8_t *data, size_t len) {
         size_t keyenc_len = file_get_size(ef_keydev_enc);
         mbedtls_chachapoly_init(&chatx);
         mbedtls_chachapoly_setkey(&chatx, vendorParam.data);
-        ret = mbedtls_chachapoly_auth_decrypt(&chatx,
-                                              sizeof(keydev_dec),
-                                              keyenc,
-                                              NULL,
-                                              0,
-                                              keyenc + keyenc_len - 16,
-                                              keyenc + 12,
-                                              keydev_dec);
+        ret = mbedtls_chachapoly_auth_decrypt(&chatx, sizeof(keydev_dec), keyenc, NULL, 0, keyenc + keyenc_len - 16, keyenc + 12, keydev_dec);
         mbedtls_chachapoly_free(&chatx);
         if (ret != 0) {
             CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
@@ -243,10 +236,7 @@ int cbor_vendor_generic(uint8_t cmd, const uint8_t *data, size_t len) {
             uint8_t buffer[1024];
             mbedtls_ecdsa_context ekey;
             mbedtls_ecdsa_init(&ekey);
-            int ret = mbedtls_ecp_read_key(MBEDTLS_ECP_DP_SECP256R1,
-                                           &ekey,
-                                           file_get_data(ef_keydev),
-                                           file_get_size(ef_keydev));
+            int ret = mbedtls_ecp_read_key(MBEDTLS_ECP_DP_SECP256R1, &ekey, file_get_data(ef_keydev), file_get_size(ef_keydev));
             if (ret != 0) {
                 mbedtls_ecdsa_free(&ekey);
                 CBOR_ERROR(CTAP2_ERR_PROCESSING);
@@ -256,27 +246,11 @@ int cbor_vendor_generic(uint8_t cmd, const uint8_t *data, size_t len) {
                 mbedtls_ecdsa_free(&ekey);
                 CBOR_ERROR(CTAP2_ERR_PROCESSING);
             }
-#ifndef ENABLE_EMULATION
-            pico_unique_board_id_t rpiid;
-            pico_get_unique_board_id(&rpiid);
-#else
-            struct {
-                uint8_t id[8];
-            } rpiid = { 0 };
-#endif
             mbedtls_x509write_csr ctx;
             mbedtls_x509write_csr_init(&ctx);
             snprintf((char *) buffer,
                      sizeof(buffer),
-                     "C=ES,O=Pico Keys,OU=Authenticator Attestation,CN=Pico Fido EE Serial %02x%02x%02x%02x%02x%02x%02x%02x",
-                     rpiid.id[0],
-                     rpiid.id[1],
-                     rpiid.id[2],
-                     rpiid.id[3],
-                     rpiid.id[4],
-                     rpiid.id[5],
-                     rpiid.id[6],
-                     rpiid.id[7]);
+                     "C=ES,O=Pico Keys,OU=Authenticator Attestation,CN=Pico Fido EE Serial %s", pico_serial_str);
             mbedtls_x509write_csr_set_subject_name(&ctx, (char *) buffer);
             mbedtls_pk_context key;
             mbedtls_pk_init(&key);
@@ -306,7 +280,7 @@ int cbor_vendor_generic(uint8_t cmd, const uint8_t *data, size_t len) {
             }
             file_t *ef_ee_ea = search_by_fid(EF_EE_DEV_EA, NULL, SPECIFY_EF);
             if (ef_ee_ea) {
-                file_put_data(ef_ee_ea, vendorParam.data, vendorParam.len);
+                file_put_data(ef_ee_ea, vendorParam.data, (uint16_t)vendorParam.len);
             }
             low_flash_available();
             goto err;
@@ -328,7 +302,7 @@ err:
         }
         return error;
     }
-    res_APDU_size = resp_size;
+    res_APDU_size = (uint16_t)resp_size;
     return 0;
 }
 

src/fido/cmd_authenticate.c

@@ -50,6 +50,7 @@ int cmd_authenticate() {
         ret = derive_key(req->appId, false, req->keyHandle, MBEDTLS_ECP_DP_SECP256R1, &key);
         if (verify_key(req->appId, req->keyHandle, &key) != 0) {
             mbedtls_ecdsa_free(&key);
+            free(tmp_kh);
             return SW_INCORRECT_PARAMS();
         }
     }
@@ -65,36 +66,27 @@ int cmd_authenticate() {
     resp->flags = 0;
     resp->flags |= P1(apdu) == CTAP_AUTH_ENFORCE ? CTAP_AUTH_FLAG_TUP : 0x0;
     uint32_t ctr = get_sign_counter();
-    resp->ctr[0] = ctr >> 24;
-    resp->ctr[1] = ctr >> 16;
-    resp->ctr[2] = ctr >> 8;
-    resp->ctr[3] = ctr & 0xff;
+    resp->ctr[0] = (ctr >> 24) & 0xFF;
+    resp->ctr[1] = (ctr >> 16) & 0xFF;
+    resp->ctr[2] = (ctr >> 8) & 0xFF;
+    resp->ctr[3] = ctr & 0xFF;
     uint8_t hash[32], sig_base[CTAP_APPID_SIZE + 1 + 4 + CTAP_CHAL_SIZE];
     memcpy(sig_base, req->appId, CTAP_APPID_SIZE);
     memcpy(sig_base + CTAP_APPID_SIZE, &resp->flags, sizeof(uint8_t));
     memcpy(sig_base + CTAP_APPID_SIZE + 1, resp->ctr, 4);
     memcpy(sig_base + CTAP_APPID_SIZE + 1 + 4, req->chal, CTAP_CHAL_SIZE);
-    ret =
-        mbedtls_md(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), sig_base, sizeof(sig_base), hash);
+    ret = mbedtls_md(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), sig_base, sizeof(sig_base), hash);
     if (ret != 0) {
         mbedtls_ecdsa_free(&key);
         return SW_EXEC_ERROR();
     }
     size_t olen = 0;
-    ret = mbedtls_ecdsa_write_signature(&key,
-                                        MBEDTLS_MD_SHA256,
-                                        hash,
-                                        32,
-                                        (uint8_t *) resp->sig,
-                                        CTAP_MAX_EC_SIG_SIZE,
-                                        &olen,
-                                        random_gen,
-                                        NULL);
+    ret = mbedtls_ecdsa_write_signature(&key, MBEDTLS_MD_SHA256, hash, 32, (uint8_t *) resp->sig, CTAP_MAX_EC_SIG_SIZE, &olen, random_gen, NULL);
     mbedtls_ecdsa_free(&key);
     if (ret != 0) {
         return SW_EXEC_ERROR();
     }
-    res_APDU_size = 1 + 4 + olen;
+    res_APDU_size = 1 + 4 + (uint16_t)olen;
 
     ctr++;
     file_put_data(ef_counter, (uint8_t *) &ctr, sizeof(ctr));

src/fido/cmd_register.c

@@ -32,7 +32,8 @@ const uint8_t u2f_aid[] = {
 int u2f_unload();
 int u2f_process_apdu();
 
-int u2f_select(app_t *a) {
+int u2f_select(app_t *a, uint8_t force) {
+    (void) force;
     if (cap_supported(CAP_U2F)) {
         a->process_apdu = u2f_process_apdu;
         a->unload = u2f_unload;
@@ -41,7 +42,7 @@ int u2f_select(app_t *a) {
     return CCID_ERR_FILE_NOT_FOUND;
 }
 
-void __attribute__((constructor)) u2f_ctor() {
+INITIALIZER ( u2f_ctor ) {
     register_app(u2f_select, u2f_aid);
 }
 
@@ -49,9 +50,7 @@ int u2f_unload() {
     return CCID_OK;
 }
 
-const uint8_t *bogus_firefox =
-    (const uint8_t *)
-    "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
+const uint8_t *bogus_firefox = (const uint8_t *) "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
 const uint8_t *bogus_chrome = (const uint8_t *) "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
 
 extern int ctap_error(uint8_t error);
@@ -83,57 +82,41 @@ int cmd_register() {
         return SW_EXEC_ERROR();
     }
     size_t olen = 0;
-    ret =
-        mbedtls_ecp_point_write_binary(&key.grp,
-                                       &key.Q,
-                                       MBEDTLS_ECP_PF_UNCOMPRESSED,
-                                       &olen,
-                                       (uint8_t *) &resp->pubKey,
-                                       CTAP_EC_POINT_SIZE);
+    ret = mbedtls_ecp_point_write_binary(&key.grp, &key.Q, MBEDTLS_ECP_PF_UNCOMPRESSED, &olen, (uint8_t *) &resp->pubKey, CTAP_EC_POINT_SIZE);
     mbedtls_ecdsa_free(&key);
     if (ret != 0) {
         return SW_EXEC_ERROR();
     }
-    size_t ef_certdev_size = file_get_size(ef_certdev);
+    uint16_t ef_certdev_size = file_get_size(ef_certdev);
     memcpy(resp->keyHandleCertSig + KEY_HANDLE_LEN, file_get_data(ef_certdev), ef_certdev_size);
-    uint8_t hash[32],
-            sign_base[1 + CTAP_APPID_SIZE + CTAP_CHAL_SIZE + KEY_HANDLE_LEN + CTAP_EC_POINT_SIZE];
+    uint8_t hash[32], sign_base[1 + CTAP_APPID_SIZE + CTAP_CHAL_SIZE + KEY_HANDLE_LEN + CTAP_EC_POINT_SIZE];
     sign_base[0] = CTAP_REGISTER_HASH_ID;
     memcpy(sign_base + 1, req->appId, CTAP_APPID_SIZE);
     memcpy(sign_base + 1 + CTAP_APPID_SIZE, req->chal, CTAP_CHAL_SIZE);
-    memcpy(sign_base + 1 + CTAP_APPID_SIZE + CTAP_CHAL_SIZE, resp->keyHandleCertSig,
-           KEY_HANDLE_LEN);
-    memcpy(sign_base + 1 + CTAP_APPID_SIZE + CTAP_CHAL_SIZE + KEY_HANDLE_LEN,
-           (uint8_t *) &resp->pubKey,
-           CTAP_EC_POINT_SIZE);
-    ret = mbedtls_md(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
-                     sign_base,
-                     sizeof(sign_base),
-                     hash);
+    memcpy(sign_base + 1 + CTAP_APPID_SIZE + CTAP_CHAL_SIZE, resp->keyHandleCertSig, KEY_HANDLE_LEN);
+    memcpy(sign_base + 1 + CTAP_APPID_SIZE + CTAP_CHAL_SIZE + KEY_HANDLE_LEN, (uint8_t *) &resp->pubKey, CTAP_EC_POINT_SIZE);
+    ret = mbedtls_md(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), sign_base, sizeof(sign_base), hash);
     if (ret != 0) {
         return SW_EXEC_ERROR();
     }
     mbedtls_ecdsa_init(&key);
-    ret = mbedtls_ecp_read_key(MBEDTLS_ECP_DP_SECP256R1, &key, file_get_data(ef_keydev), 32);
+    uint8_t key_dev[32] = {0};
+    ret = load_keydev(key_dev);
+    if (ret != CCID_OK) {
+        return SW_EXEC_ERROR();
+    }
+    ret = mbedtls_ecp_read_key(MBEDTLS_ECP_DP_SECP256R1, &key, key_dev, 32);
+    mbedtls_platform_zeroize(key_dev, sizeof(key_dev));
     if (ret != CCID_OK) {
         mbedtls_ecdsa_free(&key);
         return SW_EXEC_ERROR();
     }
-    ret = mbedtls_ecdsa_write_signature(&key,
-                                        MBEDTLS_MD_SHA256,
-                                        hash,
-                                        32,
-                                        (uint8_t *) resp->keyHandleCertSig + KEY_HANDLE_LEN + ef_certdev_size,
-                                        CTAP_MAX_EC_SIG_SIZE,
-                                        &olen,
-                                        random_gen,
-                                        NULL);
+    ret = mbedtls_ecdsa_write_signature(&key,MBEDTLS_MD_SHA256, hash, 32, (uint8_t *) resp->keyHandleCertSig + KEY_HANDLE_LEN + ef_certdev_size, CTAP_MAX_EC_SIG_SIZE, &olen, random_gen, NULL);
     mbedtls_ecdsa_free(&key);
     if (ret != 0) {
         return SW_EXEC_ERROR();
     }
-    res_APDU_size = sizeof(CTAP_REGISTER_RESP) - sizeof(resp->keyHandleCertSig) + KEY_HANDLE_LEN +
-                    ef_certdev_size + olen;
+    res_APDU_size = sizeof(CTAP_REGISTER_RESP) - sizeof(resp->keyHandleCertSig) + KEY_HANDLE_LEN + ef_certdev_size + (uint16_t)olen;
     return SW_OK();
 }
 

src/fido/cmd_version.c

@@ -20,6 +20,6 @@
 
 int cmd_version() {
     memcpy(res_APDU, "U2F_V2", strlen("U2F_V2"));
-    res_APDU_size = strlen("U2F_V2");
+    res_APDU_size = (uint16_t)strlen("U2F_V2");
     return SW_OK();
 }

src/fido/credential.c

@@ -18,7 +18,7 @@
 #include "mbedtls/chachapoly.h"
 #include "mbedtls/sha256.h"
 #include "credential.h"
-#ifndef ENABLE_EMULATION
+#if !defined(ENABLE_EMULATION) && !defined(ESP_PLATFORM)
 #include "bsp/board.h"
 #endif
 #include "hid/ctap_hid.h"
@@ -41,14 +41,7 @@ int credential_verify(uint8_t *cred_id, size_t cred_id_len, const uint8_t *rp_id
     mbedtls_chachapoly_context chatx;
     mbedtls_chachapoly_init(&chatx);
     mbedtls_chachapoly_setkey(&chatx, key);
-    int ret = mbedtls_chachapoly_auth_decrypt(&chatx,
-                                              cred_id_len - (4 + 12 + 16),
-                                              iv,
-                                              rp_id_hash,
-                                              32,
-                                              tag,
-                                              cipher,
-                                              cipher);
+    int ret = mbedtls_chachapoly_auth_decrypt(&chatx, cred_id_len - (4 + 12 + 16), iv, rp_id_hash, 32, tag, cipher, cipher);
     mbedtls_chachapoly_free(&chatx);
     return ret;
 }
@@ -83,8 +76,7 @@ int credential_create(CborCharString *rpId,
         if (extensions->credBlob.present == true &&
             extensions->credBlob.len < MAX_CREDBLOB_LENGTH) {
             CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "credBlob"));
-            CBOR_CHECK(cbor_encode_byte_string(&mapEncoder2, extensions->credBlob.data,
-                                               extensions->credBlob.len));
+            CBOR_CHECK(cbor_encode_byte_string(&mapEncoder2, extensions->credBlob.data, extensions->credBlob.len));
         }
         if (extensions->credProtect != 0) {
             CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "credProtect"));
@@ -130,11 +122,7 @@ int credential_create(CborCharString *rpId,
     mbedtls_chachapoly_context chatx;
     mbedtls_chachapoly_init(&chatx);
     mbedtls_chachapoly_setkey(&chatx, key);
-    int ret = mbedtls_chachapoly_encrypt_and_tag(&chatx,
-                                                 rs,
-                                                 iv,
-                                                 rp_id_hash,
-                                                 32,
+    int ret = mbedtls_chachapoly_encrypt_and_tag(&chatx, rs, iv, rp_id_hash, 32,
                                                  cred_id + 4 + 12,
                                                  cred_id + 4 + 12,
                                                  cred_id + 4 + 12 + rs);
@@ -155,10 +143,7 @@ err:
     return 0;
 }
 
-int credential_load(const uint8_t *cred_id,
-                    size_t cred_id_len,
-                    const uint8_t *rp_id_hash,
-                    Credential *cred) {
+int credential_load(const uint8_t *cred_id, size_t cred_id_len, const uint8_t *rp_id_hash, Credential *cred) {
     int ret = 0;
     CborError error = CborNoError;
     uint8_t *copy_cred_id = (uint8_t *) calloc(1, cred_id_len);
@@ -205,9 +190,7 @@ int credential_load(const uint8_t *cred_id,
                     CBOR_FIELD_KEY_TEXT_VAL_UINT(2, "credProtect", cred->extensions.credProtect);
                     CBOR_FIELD_KEY_TEXT_VAL_BYTES(2, "credBlob", cred->extensions.credBlob);
                     CBOR_FIELD_KEY_TEXT_VAL_BOOL(2, "largeBlobKey", cred->extensions.largeBlobKey);
-                    CBOR_FIELD_KEY_TEXT_VAL_BOOL(2,
-                                                 "thirdPartyPayment",
-                                                 cred->extensions.thirdPartyPayment);
+                    CBOR_FIELD_KEY_TEXT_VAL_BOOL(2, "thirdPartyPayment", cred->extensions.thirdPartyPayment);
                     CBOR_ADVANCE(2);
                 }
                 CBOR_PARSE_MAP_END(_f1, 2);
@@ -258,6 +241,9 @@ void credential_free(Credential *cred) {
     CBOR_FREE_BYTE_STRING(cred->userName);
     CBOR_FREE_BYTE_STRING(cred->userDisplayName);
     CBOR_FREE_BYTE_STRING(cred->id);
+    if (cred->extensions.present) {
+        CBOR_FREE_BYTE_STRING(cred->extensions.credBlob);
+    }
     cred->present = false;
     cred->extensions.present = false;
     cred->opts.present = false;
@@ -273,7 +259,7 @@ int credential_store(const uint8_t *cred_id, size_t cred_id_len, const uint8_t *
         credential_free(&cred);
         return ret;
     }
-    for (int i = 0; i < MAX_RESIDENT_CREDENTIALS; i++) {
+    for (uint16_t i = 0; i < MAX_RESIDENT_CREDENTIALS; i++) {
         file_t *ef = search_dynamic_file(EF_CRED + i);
         Credential rcred = { 0 };
         if (!file_has_data(ef)) {
@@ -290,8 +276,7 @@ int credential_store(const uint8_t *cred_id, size_t cred_id_len, const uint8_t *
             credential_free(&rcred);
             continue;
         }
-        if (memcmp(rcred.userId.data, cred.userId.data,
-                   MIN(rcred.userId.len, cred.userId.len)) == 0) {
+        if (memcmp(rcred.userId.data, cred.userId.data, MIN(rcred.userId.len, cred.userId.len)) == 0) {
             sloti = i;
             credential_free(&rcred);
             new_record = false;
@@ -305,13 +290,13 @@ int credential_store(const uint8_t *cred_id, size_t cred_id_len, const uint8_t *
     uint8_t *data = (uint8_t *) calloc(1, cred_id_len + 32);
     memcpy(data, rp_id_hash, 32);
     memcpy(data + 32, cred_id, cred_id_len);
-    file_t *ef = file_new(EF_CRED + sloti);
-    file_put_data(ef, data, cred_id_len + 32);
+    file_t *ef = file_new((uint16_t)(EF_CRED + sloti));
+    file_put_data(ef, data, (uint16_t)cred_id_len + 32);
     free(data);
 
     if (new_record == true) { //increase rps
         sloti = -1;
-        for (int i = 0; i < MAX_RESIDENT_CREDENTIALS; i++) {
+        for (uint16_t i = 0; i < MAX_RESIDENT_CREDENTIALS; i++) {
             ef = search_dynamic_file(EF_RP + i);
             if (!file_has_data(ef)) {
                 if (sloti == -1) {
@@ -327,7 +312,7 @@ int credential_store(const uint8_t *cred_id, size_t cred_id_len, const uint8_t *
         if (sloti == -1) {
             return -1;
         }
-        ef = search_dynamic_file(EF_RP + sloti);
+        ef = search_dynamic_file((uint16_t)(EF_RP + sloti));
         if (file_has_data(ef)) {
             data = (uint8_t *) calloc(1, file_get_size(ef));
             memcpy(data, file_get_data(ef), file_get_size(ef));
@@ -336,12 +321,12 @@ int credential_store(const uint8_t *cred_id, size_t cred_id_len, const uint8_t *
             free(data);
         }
         else {
-            ef = file_new(EF_RP + sloti);
+            ef = file_new((uint16_t)(EF_RP + sloti));
             data = (uint8_t *) calloc(1, 1 + 32 + cred.rpId.len);
             data[0] = 1;
             memcpy(data + 1, rp_id_hash, 32);
             memcpy(data + 1 + 32, cred.rpId.data, cred.rpId.len);
-            file_put_data(ef, data, 1 + 32 + cred.rpId.len);
+            file_put_data(ef, data, (uint16_t)(1 + 32 + cred.rpId.len));
             free(data);
         }
     }

src/fido/ctap.h

@@ -18,16 +18,9 @@
 #ifndef _CTAP_H_
 #define _CTAP_H_
 
-#ifdef _MSC_VER  // Windows
-typedef unsigned char     uint8_t;
-typedef unsigned short    uint16_t;
-typedef unsigned int      uint32_t;
-typedef unsigned long int uint64_t;
-#else
 #include <stdlib.h>
 #include <stdint.h>
 #include <stdbool.h>
-#endif
 
 #ifdef __cplusplus
 extern "C" {

src/fido/ctap2_cbor.h

@@ -19,7 +19,11 @@
 #define _CTAP2_CBOR_H_
 
 #include "cbor.h"
+#ifndef ESP_PLATFORM
 #include "common.h"
+#else
+#define MBEDTLS_ALLOW_PRIVATE_ACCESS
+#endif
 #include "mbedtls/ecp.h"
 #include "mbedtls/ecdh.h"
 
@@ -155,7 +159,7 @@ typedef struct CborCharString {
 
 #define CBOR_FIELD_GET_KEY_TEXT(_n) \
     CBOR_ASSERT(cbor_value_is_text_string(&(_f##_n)) == true); \
-    char _fd##_n[64]; \
+    char _fd##_n[64] = {0}; \
     size_t _fdl##_n = sizeof(_fd##_n); \
     CBOR_CHECK(cbor_value_copy_text_string(&(_f##_n), _fd##_n, &_fdl##_n, &(_f##_n)))
 

src/fido/fido.c

@@ -27,13 +27,15 @@
 #if defined(USB_ITF_CCID) || defined(ENABLE_EMULATION)
 #include "ccid/ccid.h"
 #endif
-#ifndef ENABLE_EMULATION
+#if !defined(ENABLE_EMULATION) && !defined(ESP_PLATFORM)
 #include "bsp/board.h"
 #endif
 #include <math.h>
 #include "management.h"
-#include "ctap_hid.h"
+#include "hid/ctap_hid.h"
 #include "version.h"
+#include "crypto_utils.h"
+#include "otp.h"
 
 int fido_process_apdu();
 int fido_unload();
@@ -43,7 +45,7 @@ pinUvAuthToken_t paut = { 0 };
 uint8_t keydev_dec[32];
 bool has_keydev_dec = false;
 
-const uint8_t _fido_aid[] = {
+const uint8_t fido_aid[] = {
     8,
     0xA0, 0x00, 0x00, 0x06, 0x47, 0x2F, 0x00, 0x01
 };
@@ -61,7 +63,8 @@ uint8_t fido_get_version_minor() {
     return PICO_FIDO_VERSION_MINOR;
 }
 
-int fido_select(app_t *a) {
+int fido_select(app_t *a, uint8_t force) {
+    (void) force;
     if (cap_supported(CAP_FIDO2)) {
         a->process_apdu = fido_process_apdu;
         a->unload = fido_unload;
@@ -72,25 +75,13 @@ int fido_select(app_t *a) {
 
 extern uint8_t (*get_version_major)();
 extern uint8_t (*get_version_minor)();
-extern const uint8_t *fido_aid;
-extern void (*init_fido_cb)();
-extern void (*cbor_thread_func)();
-extern int (*cbor_process_cb)(uint8_t, const uint8_t *, size_t);
-extern void cbor_thread();
-extern int cbor_process(uint8_t last_cmd, const uint8_t *data, size_t len);
 
-void __attribute__((constructor)) fido_ctor() {
+INITIALIZER ( fido_ctor ) {
 #if defined(USB_ITF_CCID) || defined(ENABLE_EMULATION)
     ccid_atr = atr_fido;
 #endif
     get_version_major = fido_get_version_major;
     get_version_minor = fido_get_version_minor;
-    fido_aid = _fido_aid;
-    init_fido_cb = init_fido;
-#ifndef ENABLE_EMULATION
-    cbor_thread_func = cbor_thread;
-#endif
-    cbor_process_cb = cbor_process;
     register_app(fido_select, fido_aid);
 }
 
@@ -162,7 +153,7 @@ int x509_create_cert(mbedtls_ecdsa_context *ecdsa, uint8_t *buffer, size_t buffe
     mbedtls_x509write_crt_set_validity(&ctx, "20220901000000", "20720831235959");
     mbedtls_x509write_crt_set_issuer_name(&ctx, "C=ES,O=Pico HSM,CN=Pico FIDO");
     mbedtls_x509write_crt_set_subject_name(&ctx, "C=ES,O=Pico HSM,CN=Pico FIDO");
-    uint8_t serial[20];
+    uint8_t serial[16];
     random_gen(NULL, serial, sizeof(serial));
     mbedtls_x509write_crt_set_serial_raw(&ctx, serial, sizeof(serial));
     mbedtls_pk_context key;
@@ -179,6 +170,7 @@ int x509_create_cert(mbedtls_ecdsa_context *ecdsa, uint8_t *buffer, size_t buffe
                                         MBEDTLS_X509_KU_DIGITAL_SIGNATURE |
                                         MBEDTLS_X509_KU_KEY_CERT_SIGN);
     int ret = mbedtls_x509write_crt_der(&ctx, buffer, buffer_size, random_gen, NULL);
+    mbedtls_x509write_crt_free(&ctx);
     /* pk cannot be freed, as it is freed later */
     //mbedtls_pk_free(&key);
     return ret;
@@ -188,12 +180,19 @@ int load_keydev(uint8_t *key) {
     if (has_keydev_dec == false && !file_has_data(ef_keydev)) {
         return CCID_ERR_MEMORY_FATAL;
     }
+
     if (has_keydev_dec == true) {
         memcpy(key, keydev_dec, sizeof(keydev_dec));
     }
     else {
         memcpy(key, file_get_data(ef_keydev), file_get_size(ef_keydev));
+#ifdef PICO_RP2350
+        if (aes_decrypt(otp_key_1, NULL, 32 * 8, PICO_KEYS_AES_MODE_CBC, key, 32) != CCID_OK) {
+            return CCID_EXEC_ERROR;
+        }
+#endif
     }
+
     //return mkek_decrypt(key, file_get_size(ef_keydev));
     return CCID_OK;
 }
@@ -217,7 +216,7 @@ int verify_key(const uint8_t *appId, const uint8_t *keyHandle, mbedtls_ecdsa_con
     uint8_t hmac[32], d[32];
     size_t olen = 0;
     int ret = mbedtls_ecp_write_key_ext(key, &olen, d, sizeof(d));
-    if (key == NULL) {
+    if (key == &ctx) {
         mbedtls_ecdsa_free(&ctx);
     }
     if (ret != 0) {
@@ -226,26 +225,17 @@ int verify_key(const uint8_t *appId, const uint8_t *keyHandle, mbedtls_ecdsa_con
     uint8_t key_base[CTAP_APPID_SIZE + KEY_PATH_LEN];
     memcpy(key_base, appId, CTAP_APPID_SIZE);
     memcpy(key_base + CTAP_APPID_SIZE, keyHandle, KEY_PATH_LEN);
-    ret =
-        mbedtls_md_hmac(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
-                        d,
-                        32,
-                        key_base,
-                        sizeof(key_base),
-                        hmac);
+    ret = mbedtls_md_hmac(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), d, 32, key_base, sizeof(key_base), hmac);
     mbedtls_platform_zeroize(d, sizeof(d));
     return memcmp(keyHandle + KEY_PATH_LEN, hmac, sizeof(hmac));
 }
 
-int derive_key(const uint8_t *app_id,
-               bool new_key,
-               uint8_t *key_handle,
-               int curve,
-               mbedtls_ecdsa_context *key) {
+int derive_key(const uint8_t *app_id, bool new_key, uint8_t *key_handle, int curve, mbedtls_ecdsa_context *key) {
     uint8_t outk[67] = { 0 }; //SECP521R1 key is 66 bytes length
     int r = 0;
     memset(outk, 0, sizeof(outk));
     if ((r = load_keydev(outk)) != CCID_OK) {
+        printf("Error loading keydev: %d\n", r);
         return r;
     }
     const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA512);
@@ -256,15 +246,7 @@ int derive_key(const uint8_t *app_id,
             val |= 0x80000000;
             memcpy(&key_handle[i * sizeof(uint32_t)], &val, sizeof(uint32_t));
         }
-        r = mbedtls_hkdf(md_info,
-                         &key_handle[i * sizeof(uint32_t)],
-                         sizeof(uint32_t),
-                         outk,
-                         32,
-                         outk + 32,
-                         32,
-                         outk,
-                         sizeof(outk));
+        r = mbedtls_hkdf(md_info, &key_handle[i * sizeof(uint32_t)], sizeof(uint32_t), outk, 32, outk + 32, 32, outk, sizeof(outk));
         if (r != 0) {
             mbedtls_platform_zeroize(outk, sizeof(outk));
             return r;
@@ -274,9 +256,7 @@ int derive_key(const uint8_t *app_id,
         uint8_t key_base[CTAP_APPID_SIZE + KEY_PATH_LEN];
         memcpy(key_base, app_id, CTAP_APPID_SIZE);
         memcpy(key_base + CTAP_APPID_SIZE, key_handle, KEY_PATH_LEN);
-        if ((r =
-                 mbedtls_md_hmac(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), outk, 32, key_base,
-                                 sizeof(key_base), key_handle + 32)) != 0) {
+        if ((r = mbedtls_md_hmac(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), outk, 32, key_base, sizeof(key_base), key_handle + 32)) != 0) {
             mbedtls_platform_zeroize(outk, sizeof(outk));
             return r;
         }
@@ -290,7 +270,7 @@ int derive_key(const uint8_t *app_id,
         if (cinfo->bit_size % 8 != 0) {
             outk[0] >>= 8 - (cinfo->bit_size % 8);
         }
-        r = mbedtls_ecp_read_key(curve, key, outk, ceil((float) cinfo->bit_size / 8));
+        r = mbedtls_ecp_read_key(curve, key, outk, (size_t)ceil((float) cinfo->bit_size / 8));
         mbedtls_platform_zeroize(outk, sizeof(outk));
         if (r != 0) {
             return r;
@@ -315,10 +295,16 @@ int scan_files() {
                 mbedtls_ecdsa_free(&ecdsa);
                 return ret;
             }
-            uint8_t kdata[32];
-            int key_size = mbedtls_mpi_size(&ecdsa.d);
-            mbedtls_mpi_write_binary(&ecdsa.d, kdata, key_size);
-            ret = file_put_data(ef_keydev, kdata, key_size);
+            uint8_t kdata[64];
+            size_t key_size = 0;
+            ret = mbedtls_ecp_write_key_ext(&ecdsa, &key_size, kdata, sizeof(kdata));
+            if (ret != CCID_OK) {
+                return ret;
+            }
+#ifdef PICO_RP2350
+            ret = aes_encrypt(otp_key_1, NULL, 32 * 8, PICO_KEYS_AES_MODE_CBC, kdata, 32);
+#endif
+            ret = file_put_data(ef_keydev, kdata, (uint16_t)key_size);
             mbedtls_platform_zeroize(kdata, sizeof(kdata));
             mbedtls_ecdsa_free(&ecdsa);
             if (ret != CCID_OK) {
@@ -333,13 +319,10 @@ int scan_files() {
     ef_certdev = search_by_fid(EF_EE_DEV, NULL, SPECIFY_EF);
     if (ef_certdev) {
         if (!file_has_data(ef_certdev)) {
-            uint8_t cert[4096];
+            uint8_t cert[2048];
             mbedtls_ecdsa_context key;
             mbedtls_ecdsa_init(&key);
-            int ret = mbedtls_ecp_read_key(MBEDTLS_ECP_DP_SECP256R1,
-                                           &key,
-                                           file_get_data(ef_keydev),
-                                           file_get_size(ef_keydev));
+            int ret = mbedtls_ecp_read_key(MBEDTLS_ECP_DP_SECP256R1, &key, file_get_data(ef_keydev), file_get_size(ef_keydev));
             if (ret != 0) {
                 mbedtls_ecdsa_free(&key);
                 return ret;
@@ -354,7 +337,7 @@ int scan_files() {
             if (ret <= 0) {
                 return ret;
             }
-            file_put_data(ef_certdev, cert + sizeof(cert) - ret, ret);
+            file_put_data(ef_certdev, cert + sizeof(cert) - ret, (uint16_t)ret);
         }
     }
     else {
@@ -386,9 +369,7 @@ int scan_files() {
     }
     ef_largeblob = search_by_fid(EF_LARGEBLOB, NULL, SPECIFY_EF);
     if (!file_has_data(ef_largeblob)) {
-        file_put_data(ef_largeblob,
-                                 (const uint8_t *) "\x80\x76\xbe\x8b\x52\x8d\x00\x75\xf7\xaa\xe9\x8d\x6f\xa5\x7a\x6d\x3c",
-                                 17);
+        file_put_data(ef_largeblob, (const uint8_t *) "\x80\x76\xbe\x8b\x52\x8d\x00\x75\xf7\xaa\xe9\x8d\x6f\xa5\x7a\x6d\x3c", 17);
     }
     low_flash_available();
     return CCID_OK;

src/fido/fido.h

@@ -18,13 +18,18 @@
 #ifndef _FIDO_H_
 #define _FIDO_H_
 
-#ifndef ENABLE_EMULATION
+#if !defined(ENABLE_EMULATION) && !defined(ESP_PLATFORM)
 #include "pico/stdlib.h"
 #endif
+#ifndef ESP_PLATFORM
 #include "common.h"
+#else
+#define MBEDTLS_ALLOW_PRIVATE_ACCESS
+#endif
+
 #include "mbedtls/ecdsa.h"
 #ifndef ENABLE_EMULATION
-#include "ctap_hid.h"
+#include "hid/ctap_hid.h"
 #else
 #include <stdbool.h>
 #endif
@@ -48,16 +53,8 @@ extern mbedtls_ecp_group_id fido_curve_to_mbedtls(int curve);
 extern int mbedtls_curve_to_fido(mbedtls_ecp_group_id id);
 extern int fido_load_key(int curve, const uint8_t *cred_id, mbedtls_ecdsa_context *key);
 extern int load_keydev(uint8_t *key);
-extern int encrypt(uint8_t protocol,
-                   const uint8_t *key,
-                   const uint8_t *in,
-                   size_t in_len,
-                   uint8_t *out);
-extern int decrypt(uint8_t protocol,
-                   const uint8_t *key,
-                   const uint8_t *in,
-                   size_t in_len,
-                   uint8_t *out);
+extern int encrypt(uint8_t protocol, const uint8_t *key, const uint8_t *in, uint16_t in_len, uint8_t *out);
+extern int decrypt(uint8_t protocol, const uint8_t *key, const uint8_t *in, uint16_t in_len, uint8_t *out);
 extern int ecdh(uint8_t protocol, const mbedtls_ecp_point *Q, uint8_t *sharedSecret);
 
 #define FIDO2_ALG_ES256     -7 //ECDSA-SHA256 P256
@@ -131,10 +128,6 @@ typedef struct pinUvAuthToken {
 extern uint32_t user_present_time_limit;
 
 extern pinUvAuthToken_t paut;
-extern int verify(uint8_t protocol,
-                  const uint8_t *key,
-                  const uint8_t *data,
-                  size_t len,
-                  uint8_t *sign);
+extern int verify(uint8_t protocol, const uint8_t *key, const uint8_t *data, uint16_t len, uint8_t *sign);
 
 #endif //_FIDO_H

src/fido/management.c

@@ -32,18 +32,20 @@ const uint8_t man_aid[] = {
 };
 extern void scan_all();
 extern void init_otp();
-int man_select(app_t *a) {
+int man_select(app_t *a, uint8_t force) {
     a->process_apdu = man_process_apdu;
     a->unload = man_unload;
     sprintf((char *) res_APDU, "%d.%d.0", PICO_FIDO_VERSION_MAJOR, PICO_FIDO_VERSION_MINOR);
-    res_APDU_size = strlen((char *) res_APDU);
+    res_APDU_size = (uint16_t)strlen((char *) res_APDU);
     apdu.ne = res_APDU_size;
-    scan_all();
-    init_otp();
+    if (force) {
+        scan_all();
+        init_otp();
+    }
     return CCID_OK;
 }
 
-void __attribute__((constructor)) man_ctor() {
+INITIALIZER ( man_ctor ) {
     register_app(man_select, man_aid);
 }
 
@@ -82,9 +84,7 @@ int man_get_config() {
     res_APDU[res_APDU_size++] = CAP_OTP | CAP_U2F | CAP_OATH;
     res_APDU[res_APDU_size++] = TAG_SERIAL;
     res_APDU[res_APDU_size++] = 4;
-#ifndef ENABLE_EMULATION
-    pico_get_unique_board_id_string((char *) res_APDU + res_APDU_size, 4);
-#endif
+    memcpy(res_APDU + res_APDU_size, pico_serial.id, 4);
     res_APDU_size += 4;
     res_APDU[res_APDU_size++] = TAG_FORM_FACTOR;
     res_APDU[res_APDU_size++] = 1;
@@ -116,7 +116,7 @@ int man_get_config() {
         memcpy(res_APDU + res_APDU_size, file_get_data(ef), file_get_size(ef));
         res_APDU_size += file_get_size(ef);
     }
-    res_APDU[0] = res_APDU_size - 1;
+    res_APDU[0] = (uint8_t)(res_APDU_size - 1);
     return 0;
 }
 
@@ -130,7 +130,7 @@ int cmd_write_config() {
         return SW_WRONG_DATA();
     }
     file_t *ef = file_new(EF_DEV_CONF);
-    file_put_data(ef, apdu.data + 1, apdu.nc - 1);
+    file_put_data(ef, apdu.data + 1, (uint16_t)(apdu.nc - 1));
     low_flash_available();
     return SW_OK();
 }

src/fido/management.h

@@ -19,7 +19,7 @@
 #define _MANAGEMENT_H_
 
 #include <stdlib.h>
-#ifndef ENABLE_EMULATION
+#if !defined(ENABLE_EMULATION) && !defined(ESP_PLATFORM)
 #include "pico/stdlib.h"
 #endif
 

src/fido/oath.c

@@ -68,7 +68,8 @@ const uint8_t oath_aid[] = {
     0xa0, 0x00, 0x00, 0x05, 0x27, 0x21, 0x01
 };
 
-int oath_select(app_t *a) {
+int oath_select(app_t *a, uint8_t force) {
+    (void) force;
     if (cap_supported(CAP_OATH)) {
         a->process_apdu = oath_process_apdu;
         a->unload = oath_unload;
@@ -80,12 +81,7 @@ int oath_select(app_t *a) {
         res_APDU[res_APDU_size++] = 0;
         res_APDU[res_APDU_size++] = TAG_NAME;
         res_APDU[res_APDU_size++] = 8;
-#ifndef ENABLE_EMULATION
-	    pico_get_unique_board_id((pico_unique_board_id_t *) (res_APDU + res_APDU_size));
-	    res_APDU_size += 8;
-#else
-    	memset(res_APDU + res_APDU_size, 0, 8); res_APDU_size += 8;
-#endif
+        memcpy(res_APDU + res_APDU_size, pico_serial_str, 8); res_APDU_size += 8;
         if (file_has_data(search_dynamic_file(EF_OATH_CODE)) == true) {
             random_gen(NULL, challenge, sizeof(challenge));
             res_APDU[res_APDU_size++] = TAG_CHALLENGE;
@@ -109,7 +105,7 @@ int oath_select(app_t *a) {
     return CCID_ERR_FILE_NOT_FOUND;
 }
 
-void __attribute__((constructor)) oath_ctor() {
+INITIALIZER ( oath_ctor ) {
     register_app(oath_select, oath_aid);
 }
 
@@ -119,7 +115,7 @@ int oath_unload() {
 
 file_t *find_oath_cred(const uint8_t *name, size_t name_len) {
     for (int i = 0; i < MAX_OATH_CRED; i++) {
-        file_t *ef = search_dynamic_file(EF_OATH_CRED + i);
+        file_t *ef = search_dynamic_file((uint16_t)(EF_OATH_CRED + i));
         asn1_ctx_t ctxi, ef_tag = { 0 };
         asn1_ctx_init(file_get_data(ef), file_get_size(ef), &ctxi);
         if (file_has_data(ef) && asn1_find_tag(&ctxi, TAG_NAME, &ef_tag) == true && ef_tag.len == name_len && memcmp(ef_tag.data, name, name_len) == 0) {
@@ -134,7 +130,7 @@ int cmd_put() {
         return SW_SECURITY_STATUS_NOT_SATISFIED();
     }
     asn1_ctx_t ctxi, key = { 0 }, name = { 0 }, imf = { 0 };
-    asn1_ctx_init(apdu.data, apdu.nc, &ctxi);
+    asn1_ctx_init(apdu.data, (uint16_t)apdu.nc, &ctxi);
     if (asn1_find_tag(&ctxi, TAG_KEY, &key) == false) {
         return SW_INCORRECT_PARAMS();
     }
@@ -158,15 +154,15 @@ int cmd_put() {
     }
     file_t *ef = find_oath_cred(name.data, name.len);
     if (file_has_data(ef)) {
-        file_put_data(ef, apdu.data, apdu.nc);
+        file_put_data(ef, apdu.data, (uint16_t)apdu.nc);
         low_flash_available();
     }
     else {
         for (int i = 0; i < MAX_OATH_CRED; i++) {
-            file_t *ef = search_dynamic_file(EF_OATH_CRED + i);
-            if (!file_has_data(ef)) {
-                ef = file_new(EF_OATH_CRED + i);
-                file_put_data(ef, apdu.data, apdu.nc);
+            file_t *tef = search_dynamic_file((uint16_t)(EF_OATH_CRED + i));
+            if (!file_has_data(tef)) {
+                tef = file_new((uint16_t)(EF_OATH_CRED + i));
+                file_put_data(tef, apdu.data, (uint16_t)apdu.nc);
                 low_flash_available();
                 return SW_OK();
             }
@@ -182,7 +178,7 @@ int cmd_delete() {
         return SW_SECURITY_STATUS_NOT_SATISFIED();
     }
     asn1_ctx_t ctxi, ctxo = { 0 };
-    asn1_ctx_init(apdu.data, apdu.nc, &ctxi);
+    asn1_ctx_init(apdu.data, (uint16_t)apdu.nc, &ctxi);
     if (asn1_find_tag(&ctxi, TAG_NAME, &ctxo) == true) {
         file_t *ef = find_oath_cred(ctxo.data, ctxo.len);
         if (ef) {
@@ -217,7 +213,7 @@ int cmd_set_code() {
         return SW_OK();
     }
     asn1_ctx_t ctxi, key = { 0 }, chal = { 0 }, resp = { 0 };
-    asn1_ctx_init(apdu.data, apdu.nc, &ctxi);
+    asn1_ctx_init(apdu.data, (uint16_t)apdu.nc, &ctxi);
     if (asn1_find_tag(&ctxi, TAG_KEY, &key) == false) {
         return SW_INCORRECT_PARAMS();
     }
@@ -258,7 +254,7 @@ int cmd_reset() {
         return SW_INCORRECT_P1P2();
     }
     for (int i = 0; i < MAX_OATH_CRED; i++) {
-        file_t *ef = search_dynamic_file(EF_OATH_CRED + i);
+        file_t *ef = search_dynamic_file((uint16_t)(EF_OATH_CRED + i));
         if (file_has_data(ef)) {
             delete_file(ef);
         }
@@ -275,13 +271,13 @@ int cmd_list() {
         return SW_SECURITY_STATUS_NOT_SATISFIED();
     }
     for (int i = 0; i < MAX_OATH_CRED; i++) {
-        file_t *ef = search_dynamic_file(EF_OATH_CRED + i);
+        file_t *ef = search_dynamic_file((uint16_t)(EF_OATH_CRED + i));
         if (file_has_data(ef)) {
             asn1_ctx_t ctxi, key = { 0 }, name = { 0 };
             asn1_ctx_init(file_get_data(ef), file_get_size(ef), &ctxi);
             if (asn1_find_tag(&ctxi, TAG_NAME, &name) == true && asn1_find_tag(&ctxi, TAG_KEY, &key) == true) {
                 res_APDU[res_APDU_size++] = TAG_NAME_LIST;
-                res_APDU[res_APDU_size++] = name.len + 1;
+                res_APDU[res_APDU_size++] = (uint8_t)(name.len + 1);
                 res_APDU[res_APDU_size++] = key.data[0];
                 memcpy(res_APDU + res_APDU_size, name.data, name.len); res_APDU_size += name.len;
             }
@@ -293,7 +289,7 @@ int cmd_list() {
 
 int cmd_validate() {
     asn1_ctx_t ctxi, key = { 0 }, chal = { 0 }, resp = { 0 };
-    asn1_ctx_init(apdu.data, apdu.nc, &ctxi);
+    asn1_ctx_init(apdu.data, (uint16_t)apdu.nc, &ctxi);
     if (asn1_find_tag(&ctxi, TAG_CHALLENGE, &chal) == false) {
         return SW_INCORRECT_PARAMS();
     }
@@ -332,11 +328,7 @@ int cmd_validate() {
     return SW_OK();
 }
 
-int calculate_oath(uint8_t truncate,
-                   const uint8_t *key,
-                   size_t key_len,
-                   const uint8_t *chal,
-                   size_t chal_len) {
+int calculate_oath(uint8_t truncate, const uint8_t *key, size_t key_len, const uint8_t *chal, size_t chal_len) {
     const mbedtls_md_info_t *md_info = get_oath_md_info(key[0]);
     if (md_info == NULL) {
         return SW_INCORRECT_PARAMS();
@@ -357,9 +349,9 @@ int calculate_oath(uint8_t truncate,
         res_APDU[res_APDU_size++] = hmac[offset + 3];
     }
     else {
-        res_APDU[res_APDU_size++] = hmac_size + 1;
+        res_APDU[res_APDU_size++] = (uint8_t)(hmac_size + 1);
         res_APDU[res_APDU_size++] = key[1];
-        memcpy(res_APDU + res_APDU_size, hmac, hmac_size); res_APDU_size += hmac_size;
+        memcpy(res_APDU + res_APDU_size, hmac, hmac_size); res_APDU_size += (uint16_t)hmac_size;
     }
     apdu.ne = res_APDU_size;
     return CCID_OK;
@@ -373,7 +365,7 @@ int cmd_calculate() {
         return SW_SECURITY_STATUS_NOT_SATISFIED();
     }
     asn1_ctx_t ctxi, key = { 0 }, chal = { 0 }, name = { 0 };
-    asn1_ctx_init(apdu.data, apdu.nc, &ctxi);
+    asn1_ctx_init(apdu.data, (uint16_t)apdu.nc, &ctxi);
     if (asn1_find_tag(&ctxi, TAG_CHALLENGE, &chal) == false) {
         return SW_INCORRECT_PARAMS();
     }
@@ -404,32 +396,30 @@ int cmd_calculate() {
     }
     if ((key.data[0] & OATH_TYPE_MASK) == OATH_TYPE_HOTP) {
         uint64_t v =
-            ((uint64_t) chal.data[0] <<
-                56) |
-            ((uint64_t) chal.data[1] <<
-                48) |
-            ((uint64_t) chal.data[2] <<
-                40) |
-            ((uint64_t) chal.data[3] <<
-                32) |
-            ((uint64_t) chal.data[4] <<
-                24) | ((uint64_t) chal.data[5] << 16) | ((uint64_t) chal.data[6] << 8) | (uint64_t) chal.data[7];
+            ((uint64_t) chal.data[0] << 56) |
+            ((uint64_t) chal.data[1] << 48) |
+            ((uint64_t) chal.data[2] << 40) |
+            ((uint64_t) chal.data[3] << 32) |
+            ((uint64_t) chal.data[4] << 24) |
+            ((uint64_t) chal.data[5] << 16) |
+            ((uint64_t) chal.data[6] << 8) |
+            (uint64_t) chal.data[7];
         size_t ef_size = file_get_size(ef);
         v++;
         uint8_t *tmp = (uint8_t *) calloc(1, ef_size);
         memcpy(tmp, file_get_data(ef), ef_size);
         asn1_ctx_t ctxt;
-        asn1_ctx_init(tmp, ef_size, &ctxt);
+        asn1_ctx_init(tmp, (uint16_t)ef_size, &ctxt);
         asn1_find_tag(&ctxt, TAG_IMF, &chal);
-        chal.data[0] = v >> 56;
-        chal.data[1] = v >> 48;
-        chal.data[2] = v >> 40;
-        chal.data[3] = v >> 32;
-        chal.data[4] = v >> 24;
-        chal.data[5] = v >> 16;
-        chal.data[6] = v >> 8;
+        chal.data[0] = (v >> 56) & 0xFF;
+        chal.data[1] = (v >> 48) & 0xFF;
+        chal.data[2] = (v >> 40) & 0xFF;
+        chal.data[3] = (v >> 32) & 0xFF;
+        chal.data[4] = (v >> 24) & 0xFF;
+        chal.data[5] = (v >> 16) & 0xFF;
+        chal.data[6] = (v >> 8) & 0xFF;
         chal.data[7] = v & 0xff;
-        file_put_data(ef, tmp, ef_size);
+        file_put_data(ef, tmp, (uint16_t)ef_size);
         low_flash_available();
         free(tmp);
     }
@@ -439,7 +429,7 @@ int cmd_calculate() {
 
 int cmd_calculate_all() {
     asn1_ctx_t ctxi, key = { 0 }, chal = { 0 }, name = { 0 }, prop = { 0 };
-    asn1_ctx_init(apdu.data, apdu.nc, &ctxi);
+    asn1_ctx_init(apdu.data, (uint16_t)apdu.nc, &ctxi);
     if (P2(apdu) != 0x0 && P2(apdu) != 0x1) {
         return SW_INCORRECT_P1P2();
     }
@@ -451,17 +441,17 @@ int cmd_calculate_all() {
     }
     res_APDU_size = 0;
     for (int i = 0; i < MAX_OATH_CRED; i++) {
-        file_t *ef = search_dynamic_file(EF_OATH_CRED + i);
+        file_t *ef = search_dynamic_file((uint16_t)(EF_OATH_CRED + i));
         if (file_has_data(ef)) {
             const uint8_t *ef_data = file_get_data(ef);
             size_t ef_len = file_get_size(ef);
             asn1_ctx_t ctxe;
-            asn1_ctx_init((uint8_t *)ef_data, ef_len, &ctxe);
+            asn1_ctx_init((uint8_t *)ef_data, (uint16_t)ef_len, &ctxe);
             if (asn1_find_tag(&ctxe, TAG_NAME, &name) == false || asn1_find_tag(&ctxe, TAG_KEY, &key) == false) {
                 continue;
             }
             res_APDU[res_APDU_size++] = TAG_NAME;
-            res_APDU[res_APDU_size++] = name.len;
+            res_APDU[res_APDU_size++] = (uint8_t)name.len;
             memcpy(res_APDU + res_APDU_size, name.data, name.len); res_APDU_size += name.len;
             if ((key.data[0] & OATH_TYPE_MASK) == OATH_TYPE_HOTP) {
                 res_APDU[res_APDU_size++] = TAG_NO_RESPONSE;
@@ -498,7 +488,7 @@ int cmd_set_otp_pin() {
         return SW_CONDITIONS_NOT_SATISFIED();
     }
     asn1_ctx_t ctxi, pw = { 0 };
-    asn1_ctx_init(apdu.data, apdu.nc, &ctxi);
+    asn1_ctx_init(apdu.data, (uint16_t)apdu.nc, &ctxi);
     if (asn1_find_tag(&ctxi, TAG_PASSWORD, &pw) == false) {
         return SW_INCORRECT_PARAMS();
     }
@@ -516,7 +506,7 @@ int cmd_change_otp_pin() {
         return SW_CONDITIONS_NOT_SATISFIED();
     }
     asn1_ctx_t ctxi, pw = { 0 }, new_pw = { 0 };
-    asn1_ctx_init(apdu.data, apdu.nc, &ctxi);
+    asn1_ctx_init(apdu.data, (uint16_t)apdu.nc, &ctxi);
     if (asn1_find_tag(&ctxi, TAG_PASSWORD,  &pw) == false) {
         return SW_INCORRECT_PARAMS();
     }
@@ -541,7 +531,7 @@ int cmd_verify_otp_pin() {
         return SW_CONDITIONS_NOT_SATISFIED();
     }
     asn1_ctx_t ctxi, pw = { 0 };
-    asn1_ctx_init(apdu.data, apdu.nc, &ctxi);
+    asn1_ctx_init(apdu.data, (uint16_t)apdu.nc, &ctxi);
     if (asn1_find_tag(&ctxi, TAG_PASSWORD, &pw) == false) {
         return SW_INCORRECT_PARAMS();
     }
@@ -565,7 +555,7 @@ int cmd_verify_otp_pin() {
 
 int cmd_verify_hotp() {
     asn1_ctx_t ctxi, key = { 0 }, chal = { 0 }, name = { 0 }, code = { 0 };
-    asn1_ctx_init(apdu.data, apdu.nc, &ctxi);
+    asn1_ctx_init(apdu.data, (uint16_t)apdu.nc, &ctxi);
     uint32_t code_int = 0;
     if (asn1_find_tag(&ctxi, TAG_NAME, &name) == false) {
         return SW_INCORRECT_PARAMS();
@@ -604,7 +594,8 @@ int cmd_verify_hotp() {
     if (res_int != code_int) {
         return SW_WRONG_DATA();
     }
-    res_APDU_size = apdu.ne = 0;
+    res_APDU_size = 0;
+    apdu.ne = 0;
     return SW_OK();
 }
 

src/fido/otp.c

@@ -24,11 +24,14 @@
 #include "asn1.h"
 #include "hid/ctap_hid.h"
 #include "usb.h"
-#ifndef ENABLE_EMULATION
+#if !defined(ENABLE_EMULATION) && !defined(ESP_PLATFORM)
 #include "bsp/board.h"
 #endif
 #include "mbedtls/aes.h"
 #include "management.h"
+#ifndef ENABLE_EMULATION
+#include "tusb.h"
+#endif
 
 #define FIXED_SIZE          16
 #define KEY_SIZE            16
@@ -93,6 +96,7 @@
 
 static uint8_t config_seq = { 1 };
 
+PACK(
 typedef struct otp_config {
     uint8_t fixed_data[FIXED_SIZE];
     uint8_t uid[UID_SIZE];
@@ -104,9 +108,9 @@ typedef struct otp_config {
     uint8_t cfg_flags;
     uint8_t rfu[2];
     uint16_t crc;
-} __attribute__((packed)) otp_config_t;
+}) otp_config_t;
 
-static const size_t otp_config_size = sizeof(otp_config_t);
+#define otp_config_size sizeof(otp_config_t)
 uint16_t otp_status();
 
 int otp_process_apdu();
@@ -124,7 +128,8 @@ const uint8_t otp_aid[] = {
     0xa0, 0x00, 0x00, 0x05, 0x27, 0x20, 0x01
 };
 
-int otp_select(app_t *a) {
+int otp_select(app_t *a, uint8_t force) {
+    (void) force;
     if (cap_supported(CAP_OTP)) {
         a->process_apdu = otp_process_apdu;
         a->unload = otp_unload;
@@ -147,7 +152,7 @@ int otp_select(app_t *a) {
 uint8_t modhex_tab[] =
 { 'c', 'b', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'n', 'r', 't', 'u', 'v' };
 int encode_modhex(const uint8_t *in, size_t len, uint8_t *out) {
-    for (int l = 0; l < len; l++) {
+    for (size_t l = 0; l < len; l++) {
         *out++ = modhex_tab[in[l] >> 4];
         *out++ = modhex_tab[in[l] & 0xf];
     }
@@ -158,7 +163,7 @@ extern void scan_all();
 void init_otp() {
     if (scanned == false) {
         scan_all();
-        for (int i = 0; i < 2; i++) {
+        for (uint8_t i = 0; i < 2; i++) {
             file_t *ef = search_dynamic_file(EF_OTP_SLOT1 + i);
             uint8_t *data = file_get_data(ef);
             otp_config_t *otp_config = (otp_config_t *) data;
@@ -327,11 +332,13 @@ int otp_button_pressed(uint8_t slot) {
             low_flash_available();
         }
     }
+#else
+    (void) slot;
 #endif
     return 0;
 }
 
-void __attribute__((constructor)) otp_ctor() {
+INITIALIZER( otp_ctor ) {
     register_app(otp_select, otp_aid);
     button_pressed_cb = otp_button_pressed;
 #ifndef ENABLE_EMULATION
@@ -449,9 +456,7 @@ int cmd_otp() {
         low_flash_available();
     }
     else if (p1 == 0x10) {
-#ifndef ENABLE_EMULATION
-        pico_get_unique_board_id_string((char *) res_APDU, 4);
-#endif
+        memcpy(res_APDU, pico_serial.id, 4);
         res_APDU_size = 4;
     }
     else if (p1 == 0x13) {
@@ -479,9 +484,7 @@ int cmd_otp() {
             else if (p1 == 0x20 || p1 == 0x28) {
                 uint8_t challenge[16];
                 memcpy(challenge, apdu.data, 6);
-#ifndef ENABLE_EMULATION
-                pico_get_unique_board_id_string((char *) challenge + 6, 10);
-#endif
+                memcpy(challenge + 6, pico_serial_str, 10);
                 mbedtls_aes_context ctx;
                 mbedtls_aes_init(&ctx);
                 mbedtls_aes_setkey_enc(&ctx, otp_config->aes_key, 128);
@@ -547,39 +550,43 @@ int otp_hid_set_report_cb(uint8_t itf,
                            uint8_t const *buffer,
                            uint16_t bufsize)
 {
-    if (report_type == 3) {
-        DEBUG_PAYLOAD(buffer, bufsize);
-        if (itf == ITF_KEYBOARD && buffer[7] == 0xFF) { // reset
-            *get_send_buffer_size(ITF_KEYBOARD) = 0;
-            otp_curr_seq = otp_exp_seq = 0;
-            memset(otp_frame_tx, 0, sizeof(otp_frame_tx));
-        }
-        else if (buffer[7] & 0x80) { // a frame
-            uint8_t rseq = buffer[7] & 0x1F;
-            if (rseq < 10) {
-                if (rseq == 0) {
-                    memset(otp_frame_rx, 0, sizeof(otp_frame_rx));
-                }
-                memcpy(otp_frame_rx + rseq * 7, buffer, 7);
-                if (rseq == 9) {
-                    DEBUG_DATA(otp_frame_rx, sizeof(otp_frame_rx));
-                    uint16_t residual_crc = calculate_crc(otp_frame_rx, 64), rcrc = (otp_frame_rx[66] << 8 | otp_frame_rx[65]);
-                    uint8_t slot_id = otp_frame_rx[64];
-                    if (residual_crc == rcrc) {
-                        apdu.data = otp_frame_rx;
-                        apdu.nc = 64;
-                        apdu.rdata = otp_frame_tx;
-                        apdu.header[0] = 0;
-                        apdu.header[1] = 0x01;
-                        apdu.header[2] = slot_id;
-                        apdu.header[3] = 0;
-                        int ret = otp_process_apdu();
-                        if (ret == 0x9000 && res_APDU_size > 0) {
-                            otp_send_frame(apdu.rdata, apdu.rlen);
-                        }
+    if (itf == ITF_KEYBOARD) {
+        if (report_type == 3) {
+            DEBUG_PAYLOAD(buffer, bufsize);
+            if (buffer[7] == 0xFF) { // reset
+                *get_send_buffer_size(ITF_KEYBOARD) = 0;
+                otp_curr_seq = otp_exp_seq = 0;
+                memset(otp_frame_tx, 0, sizeof(otp_frame_tx));
+            }
+            else if (buffer[7] & 0x80) { // a frame
+                uint8_t rseq = buffer[7] & 0x1F;
+                if (rseq < 10) {
+                    if (rseq == 0) {
+                        memset(otp_frame_rx, 0, sizeof(otp_frame_rx));
                     }
-                    else {
-                        printf("[OTP] Bad CRC!\n");
+                    memcpy(otp_frame_rx + rseq * 7, buffer, 7);
+                    if (rseq == 9) {
+                        DEBUG_DATA(otp_frame_rx, sizeof(otp_frame_rx));
+                        uint16_t residual_crc = calculate_crc(otp_frame_rx, 64), rcrc = (otp_frame_rx[66] << 8 | otp_frame_rx[65]);
+                        uint8_t slot_id = otp_frame_rx[64];
+                        if (residual_crc == rcrc) {
+                            uint8_t hdr[5];
+                            apdu.header = hdr;
+                            apdu.data = otp_frame_rx;
+                            apdu.nc = 64;
+                            apdu.rdata = otp_frame_tx;
+                            apdu.header[0] = 0;
+                            apdu.header[1] = 0x01;
+                            apdu.header[2] = slot_id;
+                            apdu.header[3] = 0;
+                            int ret = otp_process_apdu();
+                            if (ret == 0x9000 && res_APDU_size > 0) {
+                                otp_send_frame(apdu.rdata, apdu.rlen);
+                            }
+                        }
+                        else {
+                            printf("[OTP] Bad CRC!\n");
+                        }
                     }
                 }
             }
@@ -616,8 +623,8 @@ uint16_t otp_hid_get_report_cb(uint8_t itf,
         otp_curr_seq = otp_exp_seq = 0;
     }
     else {
+        res_APDU = buffer;
         otp_status();
-        memcpy(buffer, res_APDU, 7);
     }
 
     return reqlen;

src/fido/version.h

@@ -18,7 +18,7 @@
 #ifndef __VERSION_H_
 #define __VERSION_H_
 
-#define PICO_FIDO_VERSION 0x0508
+#define PICO_FIDO_VERSION 0x050C
 
 #define PICO_FIDO_VERSION_MAJOR ((PICO_FIDO_VERSION >> 8) & 0xff)
 #define PICO_FIDO_VERSION_MINOR (PICO_FIDO_VERSION & 0xff)

tests/pico-fido/test_020_register.py

@@ -20,6 +20,8 @@
 
 from fido2.client import CtapError
 from fido2.cose import ES256, ES384, ES512
+import fido2.features
+fido2.features.webauthn_json_mapping.enabled = False
 from utils import ES256K
 import pytest
 

tests/pico-fido/test_035_hmac_secret.py

@@ -69,12 +69,12 @@ def test_hmac_secret_entropy(device, MCHmacSecret, hmac, salts
 
     #print(shannon_entropy(auth.authenticator_data.extensions['hmac-secret']))
     if len(salts) == 1:
-        assert shannon_entropy(auth.authenticator_data.extensions['hmac-secret']) > 4.6
-        assert shannon_entropy(ext["hmacGetSecret"]['output1']) > 4.6
+        assert shannon_entropy(auth.authenticator_data.extensions['hmac-secret']) > 4.5
+        assert shannon_entropy(ext["hmacGetSecret"]['output1']) > 4.5
     if len(salts) == 2:
         assert shannon_entropy(auth.authenticator_data.extensions['hmac-secret']) > 5.4
-        assert shannon_entropy(ext["hmacGetSecret"]['output1']) > 4.6
-        assert shannon_entropy(ext["hmacGetSecret"]['output2']) > 4.6
+        assert shannon_entropy(ext["hmacGetSecret"]['output1']) > 4.5
+        assert shannon_entropy(ext["hmacGetSecret"]['output2']) > 4.5
 
 def get_output(device, MCHmacSecret, hmac, salts):
     hout = {'salt1':salts[0]}

tests/pico-fido/test_055_hid.py

@@ -196,16 +196,13 @@ class TestHID(object):
 
         device.set_cid(cid2)  # send ping on 2nd channel
         device.send_raw("\x81\x00\x39")
-        time.sleep(0.1)
-        device.send_raw("\x00")
-
         cmd, r = device.recv_raw()  # busy response
+        time.sleep(0.1)
+
 
         device.set_cid(cid1)  # finish 1st channel ping
         device.send_raw("\x00")
 
-        device.set_cid(cid2)
-
         assert cmd == 0xBF
         assert r[0] == CtapError.ERR.CHANNEL_BUSY
 
@@ -213,9 +210,11 @@ class TestHID(object):
         cmd, r = device.recv_raw()  # ping response
         assert cmd == 0x81
         assert len(r) == 0x39
+        cmd, r = device.recv_raw()  # ping response
 
     def test_cid_0(self, device):
         device.reset()
+        time.sleep(0.1)
         device.set_cid(b"\x00\x00\x00\x00")
         device.send_raw(
             "\x86\x00\x08\x11\x22\x33\x44\x55\x66\x77\x88", cid="\x00\x00\x00\x00"