incy_crypto_link (Python)

Python port of @incy/link-encoder — encode VPN subscription URLs into incy://crypt1/<payload> deep links that the INCY iOS, Android, and Desktop clients decode automatically.

Wire-compatible with the JS/PHP/Go ports and the client apps; a pinned test vector guards against drift.

This is obfuscation, not security. The AES-256-GCM key is derived from constants and asset bytes embedded in this package. See the main README for the full threat model.

Install

pip install incy-crypto-link

Requires Python ≥ 3.9 and cryptography.

Usage

from incy_crypto_link import encrypt_link, decrypt_link

link = encrypt_link("https://sub.your-provider.example/abc123token", name="My Provider VPN")
print(link)
# → incy://crypt1/AAECAwQFBgcICQoLNyIQL3rDwRZqnyoD8pGK…

decoded = decrypt_link(link)
print(decoded.url, decoded.name)

API

encrypt_link(url: str, name: str | None = None) -> str
decrypt_link(link: str) -> DecryptedLink          # .url, .name
encrypt_link_deterministic(url: str, iv: bytes, name: str | None = None) -> str  # tests only

VERSION: str
SCHEME_VERSION: str   # "crypt1"
KEY_FINGERPRINT: str  # SHA-256 of K1

Tests

python -m unittest discover -s tests -v