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Concepts: X3DH and Double Ratchet implementation notes #625
Description
Branch: Open your PR against dev. PRs targeting main are closed automatically.
Description:
Write apps/web/docs/concepts-x3dh-double-ratchet.md: implementation-level notes on lib/x3dh.ts and lib/crypto/doubleRatchet.ts, written for a reviewer checking them against the Signal specifications.
Acceptance criteria:
- Documents the Ed25519 → X25519 identity-key conversion (the Edwards–Montgomery map) and why identity keys are Ed25519 in the first place
- Documents the X3DH DH inputs, the KDF construction and info strings, and the behaviour when the bundle has no one-time prekey
- Documents the ratchet KDFs (
kdfRk,kdfCk), the skipped-key limits (MAX_SKIP100 per chain,MAX_SKIPPED_KEYS1000 overall) and what happens when either is exceeded - Lists every deviation from the Signal specs, with the reason, and links to the test vectors in
x3dh.vectors.test.ts
Activity
JClark011 commentedon Oct 19, 2026
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eeshasalaudeen734-creator commentedon Oct 20, 2026
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omarima-10 commentedon Oct 20, 2026
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drips-wave commentedon Oct 20, 2026
Congratulations, @omarima-10! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on October 22, 2026.
🧑💻 @omarima-10: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.
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docs: X3DH/Double Ratchet implementation notes, device-linking flow, …
github-actions commentedon Oct 22, 2026
Closed by #682, merged into
dev.drips-wave commentedon Oct 22, 2026
This issue has been completed by @omarima-10 as part of the Stellar Wave Program's 10th Wave 🥳
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