Challenge implementation

Makefile

@@ -157,6 +157,11 @@ ifneq ($(CAL_CI_KEY),0)
 DEFINES += HAVE_CAL_CI_KEY
 endif
 
+# ENS
+ifneq ($(TARGET_NAME),TARGET_NANOS)
+DEFINES += HAVE_DOMAIN_NAME
+endif
+
 # Enabling debug PRINTF
 DEBUG:=0
 ifneq ($(DEBUG),0)

src/apdu_constants.h

@@ -24,6 +24,8 @@
 #define INS_EIP712_STRUCT_DEF               0x1A
 #define INS_EIP712_STRUCT_IMPL              0x1C
 #define INS_EIP712_FILTERING                0x1E
+#define INS_ENS_GET_CHALLENGE               0x20
+#define INS_ENS_PROVIDE_INFO                0x22
 #define P1_CONFIRM                          0x01
 #define P1_NON_CONFIRM                      0x00
 #define P2_NO_CHAINCODE                     0x00

src/main.c

@@ -29,6 +29,7 @@
 #include "handle_get_printable_amount.h"
 #include "handle_check_address.h"
 #include "commands_712.h"
+#include "challenge.h"
 
 #ifdef HAVE_STARKWARE
 #include "stark_crypto.h"
@@ -749,6 +750,12 @@ void handleApdu(unsigned int *flags, unsigned int *tx) {
                     break;
 #endif  // HAVE_EIP712_FULL_SUPPORT
 
+#ifdef HAVE_DOMAIN_NAME
+                case INS_ENS_GET_CHALLENGE:
+                    handle_get_challenge();
+                    break;
+#endif  // HAVE_DOMAIN_NAME
+
 #if 0
         case 0xFF: // return to dashboard
           goto return_to_dashboard;
@@ -980,6 +987,11 @@ void coin_main(chain_config_t *coin_config) {
                 BLE_power(1, "Nano X");
 #endif  // HAVE_BLE
 
+#ifdef HAVE_DOMAIN_NAME
+                // to prevent it from having a fixed value at boot
+                roll_challenge();
+#endif  // HAVE_DOMAIN_NAME
+
                 app_main();
             }
             CATCH(EXCEPTION_IO_RESET) {

src_features/getChallenge/challenge.h

@@ -0,0 +1,14 @@
+#ifdef HAVE_DOMAIN_NAME
+
+#ifndef CHALLENGE_H_
+#define CHALLENGE_H_
+
+#include <stdint.h>
+
+void roll_challenge(void);
+uint32_t get_challenge(void);
+void handle_get_challenge(void);
+
+#endif  // CHALLENGE_H_
+
+#endif  // HAVE_DOMAIN_NAME

src_features/getChallenge/cmd_get_challenge.c

@@ -0,0 +1,38 @@
+#ifdef HAVE_DOMAIN_NAME
+
+#include <os.h>
+#include <os_io.h>
+#include <cx.h>
+#include "apdu_constants.h"
+#include "challenge.h"
+
+static uint32_t challenge;
+
+/**
+ * Generate a new challenge from the Random Number Generator
+ */
+void roll_challenge(void) {
+    challenge = cx_rng_u32();
+}
+
+/**
+ * Get the current challenge
+ *
+ * @return challenge
+ */
+uint32_t get_challenge(void) {
+    return challenge;
+}
+
+/**
+ * Send back the current challenge
+ */
+void handle_get_challenge(void) {
+    PRINTF("New challenge -> %u\n", get_challenge());
+    U4BE_ENCODE(G_io_apdu_buffer, 0, get_challenge());
+    U2BE_ENCODE(G_io_apdu_buffer, 4, APDU_RESPONSE_OK);
+
+    io_exchange(CHANNEL_APDU | IO_RETURN_AFTER_TX, 6);
+}
+
+#endif  // HAVE_DOMAIN_NAME