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exec: the bjn_v1 notify token - #400
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A module that mints and verifies v1.4 notify tokens exactly as the spec defines them, and the only code that makes or checks one: K is HKDF-SHA256 of the seal secret's bytes as given, the kid its fingerprint, the MAC input length-prefixed, the tag HMAC-SHA256 compared with verify_slice, and the mac canonical unpadded base64url. mint computes the session's own scope from the tenant and session, so a replica cannot mint for another session. verify takes only the kid and the tag from the token and everything else from the request. tests/notify_token.rs runs every vector in v1.4-token.json, changes every byte of the token and of each request field, and holds the named notify_token checks. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01JimHGjsfk2Ktm5GxyZJKKk
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notify_token, the module that mints and verifies exec v1.4bjn_v1notify tokens exactly as the spec's "The notify token (bjn_v1)" defines them. It is the only code that makes or checks a token; nothing else builds the MAC input, holds the key or compares a tag.NotifyKey::from_seal_secretderivesK = HKDF-SHA256(seal secret, salt empty, info "bjn_v1 notify")from the secret's bytes as given (X25519 clamps only on use), and the kidhex(SHA-256("bjn_v1 kid" ‖ K)[0..4]).mint(tenant, session, job)computes the session's own scope (JobScope::for_session) itself, so a replica cannot mint for another session's scope.verify(token, tenant, session, scope, id)parses the exact grammar (three fields, lowercase-hex kid, 43-char canonical base64url mac), returnsUnknownKidfor any kid but its own, builds the length-prefixed MAC input from the request alone, and compares the full tag withverify_slice.Verdict::refusal_status:malformed/bad_mac→ 401,unknown_kid→ 503.Nothing calls it yet; the
job_endedreceiver inservecomes next.Tests (
tests/notify_token.rs): every vector inv1.4-token.json, the minted vector reproduced, both fixture kids derived from the raw and theStaticSecretforms, a change to every byte of the token and of each request field (over 10,000 variants), plusthe_tag_is_compared_in_constant_timeandmints_only_its_own_scope. A mutant that skips the canonical re-encode and the kid check fails three of them.🤖 Generated with Claude Code
https://claude.ai/code/session_01JimHGjsfk2Ktm5GxyZJKKk