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migration(rs256): phase 120 — Add RS256 signing path (additive, HS256 stays default) (#21)
* migration(rs256): phase 120 — Add RS256 signing path (additive, HS256 stays default) Generated by workflows/120-*.ts via scripts/run-rs256-migration.sh. Spec: specs/api-keys-and-rs256-migration.md (phase 120). Co-Authored-By: agent-relay <agent@agent-relay.com> * phase 120: fix kid derivation + enforce 2048-bit RSA minimum - kid now computed as RFC 7638 JWK thumbprint: SHA-256 of the canonical JWK (lex-sorted required members, no whitespace), base64url-encoded. Removes the YYYY-MM component that caused kid to change at every month rollover, which would have silently broken verification under phase 122's RS256 cutover. - importPrivateKey rejects RSA keys < 2048 bits; logs a warning at <3072 bits per specs/token-format.md. - Single rfc7638Thumbprint() helper shared by sign path and JWKS route so both always produce matching kid values. - Regression tests: deterministic kid, time-independent kid (directly covers the month-rollover bug), sign-kid == jwks-kid, RFC 7638 known-answer, 1024-bit key rejection. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> --------- Co-authored-by: kjgbot <kjgbot@agentrelay.dev> Co-authored-by: agent-relay <agent@agent-relay.com> Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>
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‎.rs256-migration-state.json‎

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"119": {
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"status": "passed",
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"ts": "2026-04-22T19:34:50Z"
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},
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"120": {
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"status": "passed",
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"ts": "2026-04-22T19:50:05Z"
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‎.trajectories/completed/2026-04/traj_9l17u8ax5m7h.json‎

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{
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"id": "traj_9l17u8ax5m7h",
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"version": 1,
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"task": {
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"title": "120-rs256-signing-phase2a-workflow",
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"description": "Add RS256 signing path + JWKS RSA publication; HS256 stays default",
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"source": {
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"system": "workflow-runner",
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"id": "411f89adf66e635a1dd8463d"
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{
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"name": "implementer",
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}
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],
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"id": "chap_j7nrv4vhkl70",
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"title": "Planning",
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{
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"ts": 1776886503582,
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"content": "Purpose: Add RS256 signing path + JWKS RSA publication; HS256 stays default"
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},
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{
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"ts": 1776886503582,
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"type": "note",
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"content": "Approach: 18-step dag workflow — Parsed 18 steps, 2 parallel tracks, 16 dependent steps, DAG validated, no cycles"
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}
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]
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},
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"id": "chap_8jv8j46qcjt2",
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"title": "Execution: read-spec, read-existing-sign",
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"content": "\"write-tests\": Write failing tests at /Users/khaliqgant/Projects/AgentWorkforce/relayauth/packages/server/src/__tests__/sign-rs256.test",
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"content": "\"write-tests\" verification-based completion — Verification passed (3 signal(s), 2 file change(s), exit=0; signals=0, OpenAI Codex v0.117.0 (research preview), Verification passed; files=created:packages/server/src/__tests__/jwks-rsa.test.ts, created:packages/server/src/__tests__/sign-rs256.test.ts; exit=0)",
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"content": "Resolve RELAYAUTH_SIGNING_KEY_PEM only inside the RS256 sign path instead of copying it into startup config: Resolve RELAYAUTH_SIGNING_KEY_PEM only inside the RS256 sign path instead of copying it into startup config",
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"raw": {
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"question": "Resolve RELAYAUTH_SIGNING_KEY_PEM only inside the RS256 sign path instead of copying it into startup config",
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"chosen": "Resolve RELAYAUTH_SIGNING_KEY_PEM only inside the RS256 sign path instead of copying it into startup config",
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"alternatives": [],
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"reasoning": "Keeps the private PEM out of long-lived server config objects while preserving explicit bindings/tests and satisfying the requirement that the secret is read at sign time only."
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],
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"retrospective": {
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"summary": "Hardened RS256 signer secret handling, kept JWKS dual-publication, and verified dispatcher/JWKS behavior with passing targeted tests and typecheck.",
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"approach": "Standard approach",
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"confidence": 0.9
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},
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"commits": [],
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"projectId": "/Users/khaliqgant/Projects/AgentWorkforce/relayauth",
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"tags": []
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}

‎.trajectories/completed/2026-04/traj_9l17u8ax5m7h.md‎

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# Trajectory: 120-rs256-signing-phase2a-workflow
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> **Status:** ✅ Completed
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> **Task:** 411f89adf66e635a1dd8463d
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> **Confidence:** 90%
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> **Started:** April 22, 2026 at 09:35 PM
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> **Completed:** April 22, 2026 at 09:48 PM
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---
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## Summary
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Hardened RS256 signer secret handling, kept JWKS dual-publication, and verified dispatcher/JWKS behavior with passing targeted tests and typecheck.
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**Approach:** Standard approach
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---
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## Key Decisions
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### Resolve RELAYAUTH_SIGNING_KEY_PEM only inside the RS256 sign path instead of copying it into startup config
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- **Chose:** Resolve RELAYAUTH_SIGNING_KEY_PEM only inside the RS256 sign path instead of copying it into startup config
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- **Reasoning:** Keeps the private PEM out of long-lived server config objects while preserving explicit bindings/tests and satisfying the requirement that the secret is read at sign time only.
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---
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## Chapters
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### 1. Planning
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*Agent: orchestrator*
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### 2. Execution: read-spec, read-existing-sign
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*Agent: orchestrator*
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### 3. Convergence: read-spec + read-existing-sign
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*Agent: orchestrator*
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- read-spec + read-existing-sign resolved. 2/2 steps completed. All steps completed on first attempt. Unblocking: write-tests.
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### 4. Execution: write-tests
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*Agent: implementer*
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### 5. Execution: implement
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*Agent: implementer*
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### 6. Execution: self-review
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*Agent: implementer*
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- Resolve RELAYAUTH_SIGNING_KEY_PEM only inside the RS256 sign path instead of copying it into startup config: Resolve RELAYAUTH_SIGNING_KEY_PEM only inside the RS256 sign path instead of copying it into startup config

‎.trajectories/index.json‎

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"traj_a11zh8l3gbp5": {
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"title": "Work on the relay: combine relayauth + relayfile for agent sandboxing",
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"title": "120-rs256-signing-phase2a-workflow",
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