add yield() to prevent Soft WDT Resets with ARDUINO_HOMEKIT_LOWROM defined.

Author: dsbaha

src/crypto.c

@@ -432,6 +432,13 @@ int crypto_ed25519_sign(
         return -2;
     }
 
+#if defined(ARDUINO_HOMEKIT_LOWROM)
+    /*  ESP8266 Soft WDT resets with 512k ROMs.
+        Add yield() to perform other tasks and feed WDT.
+    */
+    yield();
+#endif
+
     word32 len = *signature_size;
 
     int r = wc_ed25519_sign_msg(
@@ -452,6 +459,12 @@ int crypto_ed25519_verify(
 #if defined(ARDUINO_HOMEKIT_SKIP_ED25519_VERIFY)
 	return 0;
 #else
+#if defined(ARDUINO_HOMEKIT_LOWROM)
+    /*  ESP8266 Soft WDT resets with 512k ROMs.
+        Add yield() to perform other tasks and feed WDT.
+    */
+    yield();
+#endif
     int verified;
     int r = wc_ed25519_verify_msg(
         signature, signature_size,