Add support to ESP32.

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)
@@ -33,6 +38,7 @@ pico_sdk_init()
 endif()
 
 add_executable(pico_openpgp)
+endif()
 
 set(SOURCES ${SOURCES}
         ${CMAKE_CURRENT_LIST_DIR}/src/openpgp/openpgp.c
@@ -47,7 +53,11 @@ set(INCLUDES ${INCLUDES}
 
 set(USB_ITF_CCID 1)
 include(pico-keys-sdk/pico_keys_sdk_import.cmake)
+if(ESP_PLATFORM)
+    project(pico_fido)
+endif()
 
+if(NOT ESP_PLATFORM)
 target_sources(pico_openpgp PUBLIC ${SOURCES})
 target_include_directories(pico_openpgp PUBLIC ${INCLUDES})
 
@@ -79,3 +89,4 @@ pico_add_extra_outputs(pico_openpgp)
 
 target_link_libraries(pico_openpgp PRIVATE pico_keys_sdk pico_stdlib tinyusb_device tinyusb_board pico_multicore hardware_flash hardware_sync hardware_adc pico_unique_id hardware_rtc)
 endif()
+endif()

src/openpgp/management.c

@@ -41,7 +41,7 @@ int man_select(app_t *a) {
     return CCID_OK;
 }
 
-void __attribute__((constructor)) man_ctor() {
+INITIALIZER( man_ctor ) {
     register_app(man_select, man_aid);
 }
 
@@ -79,9 +79,7 @@ int man_get_config() {
     res_APDU[res_APDU_size++] = CAP_PIV | CAP_OPENPGP;
     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;

src/openpgp/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/openpgp/openpgp.c

@@ -15,7 +15,12 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
+#ifdef ESP_PLATFORM
+#include "esp_compat.h"
+#define MBEDTLS_ALLOW_PRIVATE_ACCESS
+#else
 #include "common.h"
+#endif
 #include "openpgp.h"
 #include "version.h"
 #include "files.h"
@@ -58,7 +63,6 @@ char atr_openpgp[] = {
 
 int openpgp_process_apdu();
 
-
 extern uint32_t board_button_read(void);
 
 static bool wait_button_pressed(uint16_t fid) {
@@ -166,11 +170,7 @@ void scan_files() {
     file_t *ef;
     if ((ef = search_by_fid(EF_FULL_AID, NULL, SPECIFY_ANY))) {
         ef->data = openpgp_aid_full;
-#ifndef ENABLE_EMULATION
-        pico_get_unique_board_id_string((char *) ef->data + 12, 4);
-#else
-        memset((char *) ef->data + 12, 0, 4);
-#endif
+        memcpy(ef->data + 12, pico_serial.id, 4);
     }
     bool reset_dek = false;
     if ((ef = search_by_fid(EF_DEK, NULL, SPECIFY_ANY))) {
@@ -365,7 +365,7 @@ int openpgp_unload() {
 
 extern char __StackLimit;
 int heapLeft() {
-#ifndef ENABLE_EMULATION
+#if !defined(ENABLE_EMULATION) && !defined(ESP_PLATFORM)
     char *p = malloc(256);   // try to avoid undue fragmentation
     int left = &__StackLimit - p;
     free(p);
@@ -392,7 +392,7 @@ int openpgp_select_aid(app_t *a) {
     return CCID_OK;
 }
 
-void __attribute__((constructor)) openpgp_ctor() {
+INITIALIZER( openpgp_ctor ) {
     ccid_atr = (uint8_t *) atr_openpgp;
     register_app(openpgp_select_aid, openpgp_aid);
 }

src/openpgp/openpgp.h

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

src/openpgp/piv.c

@@ -15,17 +15,19 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
+#ifdef ESP_PLATFORM
+#include "esp_compat.h"
+#define MBEDTLS_ALLOW_PRIVATE_ACCESS
+#else
 #include "common.h"
+#endif
 #include "files.h"
 #include "apdu.h"
 #include "pico_keys.h"
 #include "random.h"
 #include "eac.h"
 #include "crypto_utils.h"
 #include "version.h"
-#ifndef ENABLE_EMULATION
-#include "pico/unique_id.h"
-#endif
 #include "asn1.h"
 #include "mbedtls/aes.h"
 #include "mbedtls/des.h"
@@ -77,14 +79,8 @@ uint8_t session_pwpiv[32];
 int piv_process_apdu();
 
 static int get_serial() {
-#ifndef ENABLE_EMULATION
-    pico_unique_board_id_t unique_id;
-    pico_get_unique_board_id(&unique_id);
-    uint32_t serial = (unique_id.id[0] & 0x7F) << 24 | unique_id.id[1] << 16 | unique_id.id[2] << 8 | unique_id.id[3];
+    uint32_t serial = (pico_serial.id[0] & 0x7F) << 24 | pico_serial.id[1] << 16 | pico_serial.id[2] << 8 | pico_serial.id[3];
     return serial;
-#else
-    return 0;
-#endif
 }
 
 static int x509_create_cert(void *pk_ctx, uint8_t algo, uint8_t slot, bool attestation, uint8_t *buffer, size_t buffer_size) {
@@ -311,7 +307,7 @@ int piv_select_aid(app_t *a) {
     return CCID_OK;
 }
 
-void __attribute__((constructor)) piv_ctor() {
+INITIALIZER( piv_ctor ) {
     register_app(piv_select_aid, piv_aid);
     register_app(piv_select_aid, yk_aid);
 }