https://github.com/iodn/esp8266-smart-weather-clock
ESP8266 Smart Weather Clock License Keygen
https://github.com/iodn/esp8266-smart-weather-clock
aliexpress esp8266 key-generator reverse-engineering small-tv smalltv smart-weather-clock
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ESP8266 Smart Weather Clock License Keygen
- Host: GitHub
- URL: https://github.com/iodn/esp8266-smart-weather-clock
- Owner: iodn
- Created: 2025-09-16T06:15:44.000Z (9 months ago)
- Default Branch: master
- Last Pushed: 2025-09-16T06:33:09.000Z (9 months ago)
- Last Synced: 2025-09-16T08:32:16.847Z (9 months ago)
- Topics: aliexpress, esp8266, key-generator, reverse-engineering, small-tv, smalltv, smart-weather-clock
- Language: Python
- Homepage:
- Size: 3.91 KB
- Stars: 0
- Watchers: 0
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# ESP8266 Smart Weather Clock License Keygen
## How It Works
The Smart Weather Clock (aka Small TV) validates devices using a license key derived from the device's MAC address. The algorithm uses a progressive CRC-8 calculation with a predefined template to generate a unique 12-character hexadecimal license key.
## Algorithm Details
| Component | Value | Purpose |
|-----------|-------|---------|
| **CRC Polynomial** | `0x07` (x⁸ + x² + x + 1) | Bit diffusion algorithm |
| **Initial CRC** | `0xCD` | Starting value for CRC calculation |
| **Template Array** | `[0x19, 0x56, 0xAD, 0xC0, 0xB3, 0xF3]` | Salt/initial state |
### Algorithm Steps
1. **Initialize** a 6-byte working array with template: `[0x19, 0x56, 0xAD, 0xC0, 0xB3, 0xF3]`
2. **For each position** `i` from 0 to 5:
- Replace `working_array[i]` with `MAC[i]`
- Calculate CRC-8 over the entire 6-byte working array
- Store CRC result as `license[i]`
### Step-by-Step Example
For MAC `40:91:51:64:39:CF`:
| Step | Working Array | CRC Result | License Byte |
|------|--------------|------------|--------------|
| 1 | `[40, 56, AD, C0, B3, F3]` | `0xB4` | B4 |
| 2 | `[40, 91, AD, C0, B3, F3]` | `0xC2` | C2 |
| 3 | `[40, 91, 51, C0, B3, F3]` | `0x29` | 29 |
| 4 | `[40, 91, 51, 64, B3, F3]` | `0xCA` | CA |
| 5 | `[40, 91, 51, 64, 39, F3]` | `0xFE` | FE |
| 6 | `[40, 91, 51, 64, 39, CF]` | `0x4A` | 4A |
**Final License:** `B4C229CAFE4A`
### CRC-8 Calculation
For each byte in the working array:
1. XOR with current CRC value
2. For 8 bits:
- Shift left by 1
- If MSB was set, XOR with polynomial `0x07`
```python
def crc8(data):
crc = 0xCD # Initial value
for byte in data:
crc ^= byte
for _ in range(8):
if crc & 0x80: # Check MSB
crc = ((crc << 1) ^ 0x07) & 0xFF
else:
crc = (crc << 1) & 0xFF
return crc
```
Each license byte depends on all previous MAC bytes plus remaining template bytes
## Usage
```bash
# Basic usage
python3 keygen.py 40:91:51:64:39:CF
```