WiFi-Passwort now generated internally and device-specific

Software/src/utilities.cpp

@@ -33,7 +33,7 @@ bool validateWiFiString(char *string, size_t size)
               c == '.' || c == '/' || c == ':' || c == ';' || c == '<' ||
               c == '=' || c == '>' || c == '?' || c == '@' || c == '[' ||
               c == '\\' || c == ']' || c == '^' || c == '_' || c == '`' ||
-              c == '{' || c == '|' || c == '}' || c == '~'))
+              c == '{' || c == '|' || c == '}' || c == '~' || c == ' '))
         {
             // Found a character that is not a valid WiFi character.
             return false;
@@ -78,7 +78,7 @@ void sanitizeWiFiString(const char *input, char *buffer, size_t bufferSize)
               c == '.' || c == '/' || c == ':' || c == ';' || c == '<' ||
               c == '=' || c == '>' || c == '?' || c == '@' || c == '[' ||
               c == '\\' || c == ']' || c == '^' || c == '_' || c == '`' ||
-              c == '{' || c == '|' || c == '}' || c == '~'))
+              c == '{' || c == '|' || c == '}' || c == '~' || c == ' '))
         {
             // Replace invalid character with placeholder
             buffer[i] = '_';
@@ -92,3 +92,34 @@ void sanitizeWiFiString(const char *input, char *buffer, size_t bufferSize)
     // Null-terminate the buffer
     buffer[i] = '\0';
 }
+
+/**
+ * @brief Generates a device-specific password based on a seed and the ESP8266 Chip ID.
+ *
+ * This function combines a given seed with the unique Chip ID of the ESP8266 device to create a device-specific password.
+ * The resulting password is stored in the provided character buffer.
+ *
+ * @param seed The seed string used for password generation. Should be up to 16 characters long.
+ * @param passwordBuffer The character buffer where the generated password will be stored.
+ * @param bufferLength The length of the password buffer. Should be large enough to hold the generated password and null terminator.
+ */
+void GenerateDeviceSpecificPassword(const char* seed, char* passwordBuffer, size_t bufferLength) {
+    uint32_t chipId = ESP.getChipId();
+    char chipIdStr[9]; // 8 characters + null terminator
+    snprintf(chipIdStr, sizeof(chipIdStr), "%08X", chipId);
+
+    char combined[33]; // seed (16) + chipId (8) + null terminator (1)
+    strncpy(combined, seed, 16);
+    strncat(combined, chipIdStr, 8);
+
+    // Simple hash function for demonstration
+    unsigned long hash = 5381;
+    int c;
+    char *str = combined;
+
+    while ((c = *str++)) {
+        hash = ((hash << 5) + hash) + c; // hash * 33 + c
+    }
+
+    snprintf(passwordBuffer, bufferLength, "%08X", hash);
+}