ptn1411 .NET Keygen
Extract the license validation algorithm from decompiled .NET code and generate a standalone keygen script.
Language rule: All skill instructions use English. Final summary presented to the user must be in Vietnamese.
0. Authorization & Routing
Operates under MASTER_POLICY.md §1-§2.
| Sibling skill | When |
|---|---|
| dotnet-decompiler | Decompile assembly first to get C# source |
| dotnet-patcher | Patch binary instead of keygen (simpler but less elegant) |
| writerpro-pentest | Generic keygen template for non-.NET apps |
| network-interceptor | Capture license server protocol for online validation |
Step 1 — Extract License Algorithm
python scripts/extract_license_algo.py decompiled/ --out license_info.json
python scripts\extract_license_algo.py decompiled\ --out license_info.json
Detects:
- Serial format:
XXXXX-XXXXX-XXXXXpatterns, length, charset, checksum algorithm - Crypto parameters: RSA public keys (modulus/exponent), AES keys/IVs, HMAC secrets
- Validation logic: Check digit algorithms, hash comparisons, date encoding
- License libraries: Cryptlex, LimeLM, Infralution, SoftwareKey, custom implementations
- HWID binding: Machine ID generation algorithm, what hardware data is collected
- Feature flags: How license tiers map to features (Pro, Enterprise, etc.)
Step 2 — Generate Keygen
From extracted info
python scripts/generate_keygen.py license_info.json --out keygen.py
From template (common patterns)
python scripts/generate_keygen.py --template serial-checksum --format "XXXXX-XXXXX-XXXXX-XXXXX" --out keygen.py
python scripts/generate_keygen.py --template rsa-signed --pubkey extracted_key.pem --out keygen.py
python scripts/generate_keygen.py --template hwid-hash --algo sha256 --secret "extracted_secret" --out keygen.py
Test generated keygen
python keygen.py --count 5
python keygen.py --hwid "YOUR_MACHINE_GUID"
python keygen.py --features pro --expiry 2030-12-31
Available Templates
| Template | File | Use Case |
|---|---|---|
serial_checksum |
templates/serial_checksum.py |
Simple serial with check digit (Luhn, mod97, custom) |
rsa_signed |
templates/rsa_signed.py |
RSA-signed license (need private key or weak key) |
hwid_hash |
templates/hwid_hash.py |
HWID-bound license with shared secret |
time_based |
templates/time_based.py |
Time-limited trial with date encoding |
feature_flags |
templates/feature_flags.py |
License with encoded feature bitmask |
Final Report (Vietnamese)
🔑 Keygen generation hoàn tất:
📋 License type : <TYPE>
🔐 Crypto : <RSA/AES/HMAC/None>
📐 Serial format : <FORMAT>
🖥️ HWID binding : <YES/NO>
⏰ Time-limited : <YES/NO>
🎯 Feature flags : <COUNT> tiers
💾 Keygen: keygen.py
📊 Info: license_info.json
Anti-Patterns
| ❌ Don't | ✅ Do |
|---|---|
| Assume simple serial without analyzing | Always extract the full validation algorithm |
| Ignore RSA key size | Keys < 512 bits can be factored; larger need private key leak |
| Skip HWID analysis | Keygen must generate HWID-bound keys if app requires it |
| Generate keys without testing | Always validate generated keys against extracted algorithm |
| Ignore online validation | Some apps check key locally AND online — need both |
| Miss obfuscated string constants | Use dotnet-decompiler with de4dot first |