legacy: show passphrase on device

legacy/firmware/config.c

@@ -597,6 +597,30 @@ const uint8_t *config_getSeed(void) {
       memzero(passphrase, sizeof(passphrase));
       return NULL;
     }
+    // passphrase is used - confirm on the display
+    if (passphrase[0] != 0) {
+      layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL,
+                        _("Access hidden wallet?"), NULL,
+                        _("Next screen will show"), _("the passphrase!"), NULL,
+                        NULL);
+      if (!protectButton(ButtonRequestType_ButtonRequest_Other, false)) {
+        memzero(mnemonic, sizeof(mnemonic));
+        memzero(passphrase, sizeof(passphrase));
+        fsm_sendFailure(FailureType_Failure_ActionCancelled,
+                        _("Passphrase dismissed"));
+        layoutHome();
+        return NULL;
+      }
+      layoutShowPassphrase(passphrase);
+      if (!protectButton(ButtonRequestType_ButtonRequest_Other, false)) {
+        memzero(mnemonic, sizeof(mnemonic));
+        memzero(passphrase, sizeof(passphrase));
+        fsm_sendFailure(FailureType_Failure_ActionCancelled,
+                        _("Passphrase dismissed"));
+        layoutHome();
+        return NULL;
+      }
+    }
     // if storage was not imported (i.e. it was properly generated or recovered)
     bool imported = false;
     config_get_bool(KEY_IMPORTED, &imported);

legacy/firmware/layout2.c

@@ -823,6 +823,25 @@ void layoutU2FDialog(const char *verb, const char *appname) {
 
 #endif
 
+void layoutShowPassphrase(const char *passphrase) {
+  if (layoutLast != layoutShowPassphrase) {
+    layoutSwipe();
+  } else {
+    oledClear();
+  }
+  const char **str =
+      split_message((const uint8_t *)passphrase, strlen(passphrase), 21);
+  for (int i = 0; i < 3; i++) {
+    oledDrawString(0, i * 9 + 4, str[i], FONT_FIXED);
+  }
+  oledDrawStringCenter(OLED_WIDTH / 2, OLED_HEIGHT - 2 * 9 - 1,
+                       _("Use this passphrase?"), FONT_STANDARD);
+  oledHLine(OLED_HEIGHT - 21);
+  layoutButtonNo(_("Cancel"), &bmp_btn_cancel);
+  layoutButtonYes(_("Confirm"), &bmp_btn_confirm);
+  oledRefresh();
+}
+
 #if !BITCOIN_ONLY
 
 void layoutNEMDialog(const BITMAP *icon, const char *btnNo, const char *btnYes,

legacy/firmware/layout2.h

@@ -69,6 +69,7 @@ void layoutXPUB(const char *xpub, int index, int page, bool ours);
 void layoutSignIdentity(const IdentityType *identity, const char *challenge);
 void layoutDecryptIdentity(const IdentityType *identity);
 void layoutU2FDialog(const char *verb, const char *appname);
+void layoutShowPassphrase(const char *passphrase);
 
 void layoutNEMDialog(const BITMAP *icon, const char *btnNo, const char *btnYes,
                      const char *desc, const char *line1, const char *address);