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+# Task: Chipotle V3 — Universal Encrypt/Decrypt Alignment
+
+**Task ID**: CHIPOTLE-V3-UNIVERSAL-ACTIONS
+**Created**: 2026-05-18
+**Status**: InProgress (Phase 1 partially landed in `6bf1cddd6 "1st attempt"`)
+**Priority**: **P0 — Security + Architecture** — CEK must never appear in plaintext between components
+**Branch**: current HEAD (atop `6bf1cddd6`)
+**Owner**: Irzhy + Sasha
+**Related**: `SEC-2026-04-28-WAVE8-CHIPOTLE-HARDENING` (predecessor — C-02 kid binding),
+`LIT-ACTION-SIGNATURE-AUTH` (predecessor — session delegation),
+`docs/core/plans/chipotle_security_alignment.md` (specification)
+
+## TL;DR
+
+The Chipotle Lit Actions have been upgraded to a unified encrypt/decrypt model:
+
+- **Encryption** returns `{ ciphertext, hash, signature, issuer }` with a composite
+  hash `SHA-256(CEK ‖ KID ‖ authority)` that replaces the old `KID = sha256(CEK)[0:16]`
+  binding.
+- **Decryption** wraps the CEK in an ECDH envelope using the requester's
+  `sessionPublicKey` instead of returning it as plaintext. The requester
+  unwraps locally.
+- **Media and non-media use the same actions** — no more separate code paths.
+
+New CIDs:
+- Encrypt: `QmVEz3dDnQD1n96gMd2mFZWXdEDsRiPMumx86qMzhT35gY`
+- Decrypt: `QmPBjQD7V4aFTZPxUwZ9gDPFJtcJ4SvsJdTh3QexTyRBbj`
+
+The PC2 node must align with these changes. Commit `6bf1cddd6` landed partial
+work (Lit Action files + encrypt-path scaffolding) but the decrypt path,
+protection data format, CID wiring, and ECDH envelope unwrapping are incomplete.
+
+## Background
+
+### What changed in the Lit Actions
+
+1. **`universal-encrypt-chipotle.js`** (new, replaces `non-media-encrypt-chipotle.js`):
+   - Accepts: `plaintext` (base64 CEK), `kid` (base64), `authority` (hex), `pkpId`
+   - Computes composite hash: `SHA-256(cekBytes ‖ kidBytes ‖ authorityBytes)`
+   - Signs the hash with the PKP's secp256k1 key
+   - Encrypts CEK via `Lit.Actions.Encrypt({ pkpId, message: plaintext })`
+   - Returns: `{ ciphertext, hash, signature, issuer }` (encoding via `outputFormat`)
+
+2. **`universal-decrypt-chipotle.js`** (new, replaces both `non-media-decrypt-chipotle.js`
+   and the old media decrypt):
+   - Full session-bundle validation (delegation + request, same as V1.2 sigauth)
+   - Recomputes and verifies composite hash binding (CEK ↔ KID ↔ authority)
+   - Optional issuer signature verification
+   - **Does NOT return plaintext CEK** — wraps it in an ECDH envelope:
+     - ECDH key agreement: `deriveKey(pkpPrivateKey, sessionPublicKey)` → AES-CBC-256
+     - IV = first 16 bytes of session public key
+     - Plaintext layout: `metaLen | issuer(20B) | exp(8B) | audience(20B) | keyCount | cek`
+     - Response includes metadata block (compressed PKP pubkey + signature + signer)
+   - Supports `keyAlg: { name: "ECDH", namedCurve: "P-256" }` (required) or `{ name: "X25519" }`
+
+### What `6bf1cddd6` ("1st attempt") already changed
+
+| File | What landed | What's missing / broken |
+|---|---|---|
+| `data/lit-actions/universal-encrypt-chipotle.js` | ✅ Complete | — |
+| `data/lit-actions/universal-decrypt-chipotle.js` | ✅ Complete | — |
+| `chipotle-client.ts` | `EncryptParams` got `kid?`/`authority?`; `encryptWithLitAction` encodes raw bytes as base64 (was UTF-8), parses `hash`/`issuer`/`signature` from response | Still loads `non-media-encrypt-chipotle.js` not universal; doesn't pass `kid`/`authority` to jsParams; no unified decrypt function; no ECDH envelope unwrapping; no new CID constants |
+| `storage.ts` | Encrypt path passes raw CEK bytes; Datil path removed | Decrypt path untouched; default action CID still `bafkrei…` (V1.2 sigauth); no `kid`/`signature`/`issuer` in response |
+| `dashPackager.ts` | `encryptMediaCEK` passes raw CEK bytes (was UTF-8) | **REGRESSION**: `generateCEK` reverted to `kid = sha256(cek)[0:16]` (should be random UUID); `MEDIA_DECRYPT_ACTION_CID` not updated; `kid`/`authority` not passed to encrypt; protection data format not updated |
+| `media.ts` | — | Completely untouched |
+
+## Requirements
+
+### Must-have
+
+- [ ] **CEK never in plaintext** between Lit Action response and the consuming
+      component. All decrypt paths produce an ECDH envelope; the server
+      unwraps locally using its ephemeral P-256 private key.
+- [ ] **Unified encrypt**: `encryptWithLitAction` calls `universal-encrypt-chipotle.js`
+      with `kid`, `authority`, `outputFormat: "hex"`. KID is generated independently
+      from CEK.
+- [ ] **Unified decrypt**: single function `recoverCEKViaEnvelope` replaces both
+      `recoverNonMediaCEK` and the Datil ECDH path in `media.ts`. Generates
+      P-256 ephemeral keypair, sends `publicKey` + `keyAlg` to Lit Action,
+      receives ECDH envelope, unwraps to raw CEK.
+- [ ] **Protection data format** aligned with keystore service:
+      `protocolVersion: "3.0"`, `signature`, `issuer`, `format: "hex"`,
+      `algorithm` field, no `ciphersuite`.
+- [ ] **Legacy asset compatibility**: if `actionIpfsId` is present in protection
+      data → use that CID (legacy action); if response `.data` is ≤16 bytes
+      raw → treat as legacy plaintext CEK.
+- [ ] **CID constants updated**: default decrypt = `QmPBjQD7V4aFTZPxUwZ9gDPFJtcJ4SvsJdTh3QexTyRBbj`,
+      encrypt = `QmVEz3dDnQD1n96gMd2mFZWXdEDsRiPMumx86qMzhT35gY`.
+- [ ] `keyAlg: { name: "ECDH", namedCurve: "P-256" }` explicitly in all decrypt calls.
+
+### Should-have
+
+- [ ] Documentation: `docs/core/CHIPOTLE_V3_PROTOCOL.md` covering full protocol.
+- [ ] `non-media-encrypt-chipotle.js` and `non-media-decrypt-chipotle.js` retained
+      on disk but no longer loaded by default (legacy fallback only).
+
+### Out of scope
+
+- Player-side (`media-player/`) changes — handled separately.
+- Chipotle allowlist registration for the new CIDs (operational, not code).
+- Supernode `ddrm-config.json` updates (deployment step).
+
+## Implementation Plan
+
+See per-phase task files for detailed implementation:
+
+- [x] **Phase 0**: Lit Action files landed — [`PHASE-0-LIT-ACTIONS.md`](./PHASE-0-LIT-ACTIONS.md)
+- [ ] **Phase 1**: Encryption path — [`PHASE-1-ENCRYPT.md`](./PHASE-1-ENCRYPT.md)
+- [ ] **Phase 2**: ECDH envelope unwrapping — [`PHASE-2-ECDH-UNWRAP.md`](./PHASE-2-ECDH-UNWRAP.md)
+- [ ] **Phase 3**: Unified decryption — [`PHASE-3-DECRYPT.md`](./PHASE-3-DECRYPT.md)
+- [ ] **Phase 4**: Protection data format — [`PHASE-4-PROTECTION-DATA.md`](./PHASE-4-PROTECTION-DATA.md)
+- [ ] **Phase 5**: Documentation — [`PHASE-5-DOCS.md`](./PHASE-5-DOCS.md)
+
+## Acceptance Criteria
+
+1. `cd pc2-node && npx tsc --noEmit` compiles cleanly.
+2. `POST /api/storage/lit/encrypt` returns `kid`, `signature`, `issuer`,
+   `ciphertext`, `dataToEncryptHash` — all hex-encoded.
+3. `POST /api/storage/lit/secure-view` with a newly encrypted non-media asset
+   recovers CEK via ECDH envelope (no plaintext CEK in Lit Action response).
+4. Media DASH packaging embeds new CIDs, `signature`, `issuer` in PSSH.
+5. Existing assets with old `actionIpfsId` still decrypt (legacy compatibility).
+6. No code path logs, caches, or transmits the raw CEK in plaintext between
+   the Lit Action response and the AES-decrypt call.
+
+## Files Modified
+
+| File | Phase | Change |
+|---|---|---|
+| `pc2-node/src/api/chipotle-client.ts` | 1,2,3 | New CID constants, universal encrypt loader, `recoverCEKViaEnvelope`, ECDH unwrap |
+| `pc2-node/src/api/storage.ts` | 1,3,4 | Encrypt response, decrypt path, default CID, protection data |
+| `pc2-node/src/services/media/dashPackager.ts` | 1,4 | CID updates, independent KID, protection data format |
+| `pc2-node/src/api/media.ts` | 2,3 | Extract ECDH helpers, unified decrypt, remove Datil path |
+
+## Files Created
+
+| File | Phase | Purpose |
+|---|---|---|
+| `docs/core/CHIPOTLE_V3_PROTOCOL.md` | 5 | Full protocol documentation |
+| `.cursor/tasks/CHIPOTLE-V3-UNIVERSAL-ACTIONS/*.md` | — | This task + phase docs |
+
+## Hard Constraints
+
+- Do NOT delete `non-media-encrypt-chipotle.js` or `non-media-decrypt-chipotle.js`
+  from disk — existing delegations may reference them.
+- Do NOT change the ECDH envelope wire format — the player-side decoder must
+  stay compatible.
+- Do NOT log CEK bytes, CEK base64, or CEK hex at any log level.
+- Do NOT accept `rpc` from client/PSSH — always use `getBaseRpcUrl()` (M-01 fix).
+
+## Status History
+
+| Date | Status | Note |
+|---|---|---|
+| 2026-05-18 | InProgress | `6bf1cddd6` landed Lit Action files + partial encrypt scaffolding |
+| 2026-05-18 | InProgress | Task doc + phase breakdown created |
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+# Phase 0: Lit Action Files
+
+**Status**: ✅ Done (landed in `6bf1cddd6`)
+
+## What was done
+
+Both universal Lit Action files were created and committed:
+
+- `pc2-node/data/lit-actions/universal-encrypt-chipotle.js` (94 lines)
+- `pc2-node/data/lit-actions/universal-decrypt-chipotle.js` (587 lines)
+
+These are the new Lit Action source files that Chipotle executes inside the TEE.
+They are complete and require no further changes.
+
+## Encrypt action summary
+
+Inputs: `plaintext` (base64 CEK), `kid` (base64), `authority` (hex), `pkpId`, `outputFormat`
+
+1. Validates inputs (pkpId, authority must be valid addresses; kid + plaintext non-empty)
+2. Decodes CEK, KID, authority to bytes
+3. Computes composite: `SHA-256(cekBytes ‖ kidBytes ‖ authorityBytes)`
+4. Signs composite hash with PKP's secp256k1 key
+5. Encrypts CEK via `Lit.Actions.Encrypt({ pkpId, message: plaintext })`
+6. Returns `{ ciphertext, hash, signature, issuer }` encoded per `outputFormat`
+
+## Decrypt action summary
+
+Inputs: session bundle (delegation, delegationSig, request, requestSig),
+`ciphertext`, `dataToEncryptHash`, `kid`, `pkpId`, `authority`, `chainId`,
+`rpc`, `actionIpfsId`, `keyAlg`, `publicKey` (session P-256 pub hex)
+
+1. Validates + verifies session bundle (identical to V1.2 sigauth)
+2. On-chain access check via `hasAccessByContentId`
+3. Decrypts CEK via `Lit.Actions.Decrypt({ pkpId, ciphertext })`
+4. Recomputes `SHA-256(cekBytes ‖ kidBytes ‖ authorityBytes)` — must match `dataToEncryptHash`
+5. Optional issuer signature verification
+6. Wraps CEK in ECDH envelope via `envelopeCEK()`:
+   - ECDH(pkpPrivateKey, sessionPublicKey) → AES-CBC-256 shared key
+   - IV = sessionPublicKey[0..15]
+   - Encrypts rawLicenseBytes (metadata + CEK)
+   - Signs encrypted body with PKP secp256k1
+7. Returns `{ data: base64(envelope), byteLength, authorizedAddress }`
@@ -0,0 +1,155 @@
+# Phase 1: Encryption Path
+
+**Status**: Incomplete (scaffolding landed in `6bf1cddd6`, wiring not done)
+**Estimated effort**: ~2 hours
+**Files**: `chipotle-client.ts`, `dashPackager.ts`, `storage.ts`
+
+## What `6bf1cddd6` already did
+
+- `EncryptParams` interface: added optional `kid?: string`, `authority?: string`
+- `EncryptResult` interface: added optional `issuer?: string`, `signature?: string`
+- `encryptWithLitAction()`: CEK bytes → base64 (was UTF-8); parses `hash`/`issuer`/`signature` from response; fallback composite hash computation
+- `storage.ts` `/lit/encrypt`: passes raw CEK bytes (was UTF-8 of base64); Datil path removed
+- `dashPackager.ts`: `encryptMediaCEK` passes raw CEK bytes
+
+## What's still broken / missing
+
+### 1. `chipotle-client.ts` — encrypt code loader
+
+**Current** (line ~494–510): `getChipotleEncryptCode()` loads `non-media-encrypt-chipotle.js`
+
+**Required**: Load `universal-encrypt-chipotle.js` instead. Add new cached loader:
+
+```typescript
+let cachedUniversalEncryptCode: string | null = null;
+
+function getUniversalEncryptCode(): string {
+  if (cachedUniversalEncryptCode) return cachedUniversalEncryptCode;
+  const actionPath = join(DATA_DIR, 'lit-actions/universal-encrypt-chipotle.js');
+  if (!existsSync(actionPath)) {
+    throw new Error(`Universal encrypt Lit Action not found at ${actionPath}.`);
+  }
+  cachedUniversalEncryptCode = readFileSync(actionPath, 'utf8');
+  return cachedUniversalEncryptCode;
+}
+```
+
+Then in `encryptWithLitAction()`, change `getChipotleEncryptCode()` → `getUniversalEncryptCode()`.
+
+### 2. `chipotle-client.ts` — pass `kid`/`authority`/`outputFormat` to jsParams
+
+**Current** (line ~830): `jsParams: { pkpId, plaintext }`
+
+**Required**: 
+```typescript
+const jsParams: Record<string, unknown> = {
+  pkpId,
+  plaintext,
+  kid: params.kid,           // base64-encoded KID bytes
+  authority: params.authority, // hex, 0x-prefixed
+  outputFormat: 'hex',
+};
+```
+
+The universal-encrypt action validates that `kid`, `authority`, and `plaintext` are non-empty and that `pkpId`/`authority` are valid addresses.
+
+### 3. `chipotle-client.ts` — CID constants
+
+Add near the top constants block:
+
+```typescript
+const UNIVERSAL_ENCRYPT_CID = 'QmVEz3dDnQD1n96gMd2mFZWXdEDsRiPMumx86qMzhT35gY';
+const UNIVERSAL_DECRYPT_CID = 'QmPBjQD7V4aFTZPxUwZ9gDPFJtcJ4SvsJdTh3QexTyRBbj';
+```
+
+Export them for use by `dashPackager.ts` and `storage.ts`.
+
+### 4. `dashPackager.ts` — fix `generateCEK()` regression
+
+**Current** (line 99–102, REGRESSED in `6bf1cddd6`):
+```typescript
+const cek = crypto.randomBytes(16);
+const kid = crypto.createHash('sha256').update(cek).digest().subarray(0, 16);
+return { cek, kid: kid.toString('hex') };
+```
+
+**Required**: KID is independent of CEK:
+```typescript
+export function generateCEK(): { cek: Buffer; kid: string } {
+  const cek = crypto.randomBytes(16);
+  const kid = crypto.randomUUID().replace(/-/g, '');
+  return { cek, kid };
+}
+```
+
+### 5. `dashPackager.ts` — pass `kid` and `authority` to `encryptMediaCEK`
+
+**Current** (line 107): `encryptMediaCEK(cek: Buffer)`
+
+**Required**:
+```typescript
+export async function encryptMediaCEK(cek: Buffer, kid: string): Promise<EncryptResult> {
+  // ...
+  const result = await encryptWithLitAction({
+    dataToEncrypt: cek,
+    kid: Buffer.from(kid, 'hex').toString('base64'),
+    authority: DEFAULT_AUTHORITY,
+    accessControlConditions: conditions,
+  });
+  // ...
+}
+```
+
+Update caller in `createEncryptedDASH` to pass `kid`.
+
+### 6. `dashPackager.ts` — update CID constants
+
+```typescript
+const MEDIA_DECRYPT_ACTION_CID = 'QmPBjQD7V4aFTZPxUwZ9gDPFJtcJ4SvsJdTh3QexTyRBbj';
+const MEDIA_ENCRYPT_ACTION_CID = 'QmVEz3dDnQD1n96gMd2mFZWXdEDsRiPMumx86qMzhT35gY';
+```
+
+Or import from `chipotle-client.ts` to keep in sync.
+
+### 7. `storage.ts` — encrypt endpoint: generate KID, pass to encrypt, return in response
+
+**Current** (line ~2231): no KID generation, no kid/authority/signature/issuer in response
+
+**Required** in `POST /lit/encrypt`:
+```typescript
+// Generate random 256-bit KID for non-media
+const kidBytes = crypto.randomBytes(32);
+const kidBase64 = kidBytes.toString('base64');
+const kidHex = kidBytes.toString('hex');
+
+const chipotleResult = await encryptWithLitAction({
+  dataToEncrypt: Buffer.from(cekBase64, 'base64'),
+  kid: kidBase64,
+  authority: DEFAULT_AUTHORITY,
+  accessControlConditions: [],
+});
+
+// Return extended response
+res.json({
+  success: true,
+  litCiphertext: chipotleResult.ciphertext,
+  dataToEncryptHash: chipotleResult.dataToEncryptHash,
+  kid: '0x' + kidHex,
+  signature: chipotleResult.signature,
+  issuer: chipotleResult.issuer,
+  actionCid: effectiveActionCid,
+  // ...existing fields...
+});
+```
+
+## Checklist
+
+- [ ] Add `getUniversalEncryptCode()` loader in `chipotle-client.ts`
+- [ ] Switch `encryptWithLitAction` to use `getUniversalEncryptCode()`
+- [ ] Pass `kid`, `authority`, `outputFormat: "hex"` in jsParams
+- [ ] Add + export `UNIVERSAL_ENCRYPT_CID` and `UNIVERSAL_DECRYPT_CID` constants
+- [ ] Fix `generateCEK()` regression in `dashPackager.ts` (random UUID KID)
+- [ ] Add `kid` parameter to `encryptMediaCEK()` and pass `kid`/`authority`
+- [ ] Update `MEDIA_DECRYPT_ACTION_CID` and `MEDIA_ENCRYPT_ACTION_CID`
+- [ ] Update `storage.ts` encrypt endpoint: generate KID, pass to encrypt, return in response
+- [ ] `tsc --noEmit` passes