ptn1411/skill/dotnet-keygen

Claude Code and agent skill by ptn1411/skill

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Extract license validation algorithms from decompiled .NET source and generate keygens. Supports common license libraries (Cryptlex, LimeLM, custom), serial format detection, and crypto parameter extraction (RSA/AES/HMAC).

Install

npx vskill@latest install ptn1411/skill/dotnet-keygen

SKILL.md

.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 skillWhen
dotnet-decompilerDecompile assembly first to get C# source
dotnet-patcherPatch binary instead of keygen (simpler but less elegant)
writerpro-pentestGeneric keygen template for non-.NET apps
network-interceptorCapture license server protocol for online validation

Step 1 — Extract License Algorithm

bash
python scripts/extract_license_algo.py decompiled/ --out license_info.json
powershell
python scripts\extract_license_algo.py decompiled\ --out license_info.json

Detects:

  • Serial format: XXXXX-XXXXX-XXXXX patterns, 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
bash
python scripts/generate_keygen.py license_info.json --out keygen.py
From template (common patterns)
bash
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
bash
python keygen.py --count 5
python keygen.py --hwid "YOUR_MACHINE_GUID"
python keygen.py --features pro --expiry 2030-12-31

Available Templates

TemplateFileUse Case
serial_checksumtemplates/serial_checksum.pySimple serial with check digit (Luhn, mod97, custom)
rsa_signedtemplates/rsa_signed.pyRSA-signed license (need private key or weak key)
hwid_hashtemplates/hwid_hash.pyHWID-bound license with shared secret
time_basedtemplates/time_based.pyTime-limited trial with date encoding
feature_flagstemplates/feature_flags.pyLicense 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 analyzingAlways extract the full validation algorithm
Ignore RSA key sizeKeys < 512 bits can be factored; larger need private key leak
Skip HWID analysisKeygen must generate HWID-bound keys if app requires it
Generate keys without testingAlways validate generated keys against extracted algorithm
Ignore online validationSome apps check key locally AND online — need both
Miss obfuscated string constantsUse dotnet-decompiler with de4dot first

Security

  • Security scanPassed, 100 of 100Pattern checks on the skill's files.
  • Model reviewNot runA model review is scheduled for the next rescan.

See the full security report

Quality evaluation

  • Task evaluationNot runNo evaluation yet. Run one in Skill Studio.

See evaluation results

Source

Popularity

Repository stars
150
Repository forks
90
7-day trend score
25

Stars and forks are for the whole GitHub repository, not this skill alone. Not refreshed yet.

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