Hey PH! Builder of Grimlock here. We built this after running into a painful problem at Privyy.io, our Go backend and TypeScript frontend needed to share encrypted data, but every crypto library is language-specific. That meant either duplicating logic with subtle incompatibilities or trusting a black box. Grimlock solves this with identical cryptographic implementations in both Go and TypeScript, with a cross-compatibility test suite that verifies Go-encrypted data decrypts correctly in TS and vice versa and back again. Under the hood: X25519 ECDH + AES-256-GCM for messages, Argon2id for passcode-derived keys, HKDF-SHA512 for recovery keys. All with a versioned protocol so you can evolve without breaking existing encrypted data. Happy to answer questions about the cryptographic design, the cross-lang testing approach, or why we chose these primitives. Would love your feedback! 🔐

Grimlock: E2EE Cross Platform OpenSource

E2EE library for byte-to-byte parity across Go, TS and Py

E2EE library for byte-to-byte parity across Go, TS and Py