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A browser-based tool that decrypts happ:// deep links (all five generations: crypt through crypt5) http://leeeet.dev/happ-decryptor/
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 Use direct crypt5 decryption with emulator fallback
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README.md Use direct crypt5 decryption with emulator fallback 2026-07-15 08:00:11 -04:00
vite.config.js Initial commit: happ link decryptor web app 2026-04-15 16:39:38 -08:00

README.md

Happ Link Decryptor

Browser-based decryptor for supported happ:// deep links.

The app runs entirely client-side and supports all currently bundled formats: crypt, crypt2, crypt3, crypt4, and crypt5.

Highlights

  • Decryption happens locally in the browser — no server
  • Legacy RSA-wrapped links (crypt–crypt4) decrypt directly in JavaScript
  • crypt5 decrypts directly with RSA + ChaCha20-Poly1305, including both the legacy and newer salted/XOR layouts
  • The original native-library CPU emulator remains as an automatic fallback
  • 36 bundled crypt5 marker keys + the fallback emulation assets are committed under public/

Development

npm install
npm run dev
npm test
npm run build
npm run preview

How it works

  • src/decrypt.js — top-level decode for every generation.
  • src/crypt5.js — lightweight direct crypt5 parsing, RSA key recovery, salt/XOR handling, and authenticated ChaCha20-Poly1305 decryption.
  • src/emu/ — fallback that loads liberror-code.so onto unicorn.js (Unicorn 2.1.4, asm.js) with a mock JNI/libc host and its existing JavaScript BigInt RSA fast path.
  • public/data/crypt5-keys.json — PKCS#8 keys for direct decryption; public/data/keytable.json — key strings used by the native fallback.

The detailed reverse-engineering write-up is in the in-page dossier (index.html).

Runtime Dependencies

  • node-forge — RSA PKCS#1 v1.5 decryption.
  • @noble/ciphers — audited ChaCha20-Poly1305 implementation for direct crypt5 decryption.

Privacy

Decryption happens locally in the browser tab. The app does not upload links or decrypted results to a server.