Files
bitlogin/.github
thePR0M3TH3ANandClaude Fable 5 6eb1d7d640 Pin the derivation chain, and stop Dependabot grouping crypto majors
A Dependabot PR failed the build by bundling @noble/hashes 1.8->2.2,
@noble/curves 1.9->2.2, @scure/base 1.2->2.2, @scure/bip39 1.6->2.2,
TypeScript 5->7, Vite 6->8 and Vitest 3->4 into a single change. Production
was never affected -- only that preview -- and the cause is real rather than
flaky: noble v2 exports only ".js"-suffixed subpaths, while this code imports
the extensionless "@noble/hashes/sha2" that 1.8 provides.

Failing to compile was the LUCKY outcome. The tests could not have caught the
dangerous version of this. Account capsules live on public relays, and the
login name plus password derive the locator, signing scalar and capsule key
deterministically -- so those outputs are a compatibility contract with every
account that already exists. The crypto suite only checked self-consistency
(same input, same output within one run), which stays green even if HKDF,
base64url framing, BIP-39 seeding or JCS ordering all change. A grouped major
that compiled would have shipped and locked every existing user out, with no
server-side record to migrate them from.

So this adds knownAnswer.test.ts, pinning the actual outputs of HKDF-Extract,
HKDF-Expand, ScalarExpand (scalar, counter and resulting public key), BIP-39
phrase and seed, base64url, and JCS ordering. The vectors are captured from
the shipping implementation, and the header says plainly what a failure means:
not "update the expected value", but "this upgrade is account-breaking".

dependabot.yml now groups only minor and patch updates. Majors are still
proposed, individually, so each can be judged on its own. Majors of the
derivation chain itself (@noble/*, @scure/*, hash-wasm, canonicalize) are
ignored entirely -- that is deliberate work with the vectors green, not an
automated PR waiting to be merged on a quiet afternoon.

172/172 tests, typecheck clean.

Co-Authored-By: Claude Fable 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01CMr9Yt8SYmZcfgrg3CV2G1
2026-07-31 14:46:46 -04:00
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