feat: Phase 4 — MLS group state persistence & account integration
Add encrypted local storage for MLS group state so groups survive app restarts, plus key lifecycle management: - MlsGroupState: TLS-encoded serializable snapshot of complete group state (group context, ratchet tree, epoch secrets, private keys, transcript hash) - MlsGroupStateStore: interface for encrypted per-group storage (platform implementations provide EncryptedSharedPreferences / encrypted file) - MlsGroupManager: high-level coordinator managing group lifecycle, epoch secret retention window (N-1 for late messages), state persistence, and key export - RetainedEpochSecrets: bounded window of past epoch decryption secrets for out-of-order message handling - MlsGroup.saveState()/restore(): roundtrip serialization via TLS codec - MlsGroup.proposeSigningKeyRotation(): Update proposal with fresh Ed25519 signing key and X25519 encryption key for forward secrecy - KeyPackageRotationManager: tracks consumed KeyPackages after Welcome processing, handles slot rotation and proactive age-based rotation - Tests: 16 tests covering state serialization roundtrips, manager lifecycle, multi-group independence, and signing key rotation persistence https://claude.ai/code/session_01MuRS2zSVm6A36HNFwG7M5p
This commit is contained in:
Claude
+218
@@ -0,0 +1,218 @@
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/*
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* Copyright (c) 2025 Vitor Pamplona
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
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* Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package com.vitorpamplona.quartz.marmot.mip00KeyPackages
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import com.vitorpamplona.quartz.marmot.mls.crypto.Ed25519
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import com.vitorpamplona.quartz.marmot.mls.crypto.MlsCryptoProvider
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import com.vitorpamplona.quartz.marmot.mls.crypto.X25519
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import com.vitorpamplona.quartz.marmot.mls.messages.KeyPackageBundle
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import com.vitorpamplona.quartz.marmot.mls.messages.MlsKeyPackage
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import com.vitorpamplona.quartz.marmot.mls.tree.Capabilities
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import com.vitorpamplona.quartz.marmot.mls.tree.Credential
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import com.vitorpamplona.quartz.marmot.mls.tree.LeafNode
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import com.vitorpamplona.quartz.marmot.mls.tree.LeafNodeSource
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import com.vitorpamplona.quartz.marmot.mls.tree.Lifetime
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/**
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* Manages KeyPackage creation and rotation lifecycle (MIP-00).
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*
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* Key responsibilities:
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* - Generate fresh KeyPackages for publishing
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* - Track consumed KeyPackages that need rotation after Welcome processing
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* - Provide bundles for group joins
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* - Handle periodic rotation for long-lived KeyPackages
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*
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* After a KeyPackage is consumed by a Welcome message:
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* 1. The init_key is effectively spent — cannot be reused
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* 2. A new KeyPackage MUST be published to the same d-tag slot
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* 3. The old KeyPackageBundle MUST be discarded
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*
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* Per MIP-00 spec, each user should maintain up to [KeyPackageUtils.MAX_SLOTS]
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* KeyPackage slots, rotating consumed ones promptly.
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*/
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class KeyPackageRotationManager {
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private val activeBundles = mutableMapOf<String, KeyPackageBundle>()
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private val pendingRotations = mutableSetOf<String>()
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/**
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* Generate a new KeyPackage and its associated private bundle.
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*
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* @param identity the user's identity bytes (typically 32-byte Nostr pubkey)
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* @param dTagSlot the d-tag slot for addressable replacement
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* @return a [KeyPackageBundle] containing the KeyPackage and all private keys
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*/
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fun generateKeyPackage(
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identity: ByteArray,
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dTagSlot: String = KeyPackageUtils.PRIMARY_SLOT,
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): KeyPackageBundle {
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val initKp = X25519.generateKeyPair()
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val encKp = X25519.generateKeyPair()
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val sigKp = Ed25519.generateKeyPair()
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val leafNode =
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buildKeyPackageLeafNode(
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encryptionKey = encKp.publicKey,
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signatureKey = sigKp.publicKey,
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identity = identity,
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signingKey = sigKp.privateKey,
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)
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val unsigned =
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MlsKeyPackage(
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initKey = initKp.publicKey,
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leafNode = leafNode,
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signature = ByteArray(0),
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)
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val keyPackage =
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unsigned.copy(
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signature =
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MlsCryptoProvider.signWithLabel(
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sigKp.privateKey,
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"KeyPackageTBS",
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unsigned.encodeTbs(),
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),
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)
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val bundle = KeyPackageBundle(keyPackage, initKp.privateKey, encKp.privateKey, sigKp.privateKey)
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activeBundles[dTagSlot] = bundle
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return bundle
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}
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/**
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* Get the active bundle for a d-tag slot.
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* Used when processing a Welcome that references one of our KeyPackages.
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*/
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fun getBundle(dTagSlot: String): KeyPackageBundle? = activeBundles[dTagSlot]
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/**
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* Find the bundle whose KeyPackage reference matches the given ref.
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* Used when we receive a Welcome and need to find the matching bundle.
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*/
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fun findBundleByRef(keyPackageRef: ByteArray): KeyPackageBundle? =
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activeBundles.values.find { bundle ->
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bundle.keyPackage.reference().contentEquals(keyPackageRef)
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}
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/**
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* Mark a KeyPackage slot as consumed (used in a Welcome).
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* The slot will be included in [pendingRotationSlots] and should be
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* rotated by the caller.
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*/
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fun markConsumed(dTagSlot: String) {
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activeBundles.remove(dTagSlot)
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pendingRotations.add(dTagSlot)
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}
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/**
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* Mark a slot as consumed by looking up the KeyPackage reference.
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*/
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fun markConsumedByRef(keyPackageRef: ByteArray) {
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val entry =
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activeBundles.entries.find { (_, bundle) ->
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bundle.keyPackage.reference().contentEquals(keyPackageRef)
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}
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if (entry != null) {
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activeBundles.remove(entry.key)
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pendingRotations.add(entry.key)
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}
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}
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/**
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* Get the d-tag slots that need rotation (KeyPackage was consumed).
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*/
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fun pendingRotationSlots(): Set<String> = pendingRotations.toSet()
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/**
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* Clear a slot from the pending rotation set after a new KeyPackage
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* has been published.
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*/
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fun clearPendingRotation(dTagSlot: String) {
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pendingRotations.remove(dTagSlot)
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}
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/**
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* Check if any slots need rotation.
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*/
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fun needsRotation(): Boolean = pendingRotations.isNotEmpty()
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/**
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* Rotate a consumed slot: generate a new KeyPackage for the same d-tag.
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*
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* @param identity the user's identity bytes
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* @param dTagSlot the slot to rotate
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* @return the new [KeyPackageBundle] ready for publishing
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*/
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fun rotateSlot(
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identity: ByteArray,
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dTagSlot: String,
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): KeyPackageBundle {
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val bundle = generateKeyPackage(identity, dTagSlot)
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pendingRotations.remove(dTagSlot)
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return bundle
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}
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/**
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* Check if a KeyPackage should be proactively rotated based on age.
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*
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* MIP-00 recommends rotating KeyPackages periodically even if they
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* haven't been consumed, to limit the exposure window.
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*
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* @param createdAtSeconds the KeyPackage event's created_at timestamp
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* @param nowSeconds current time in seconds
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* @return true if the KeyPackage should be rotated
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*/
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fun shouldRotateByAge(
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createdAtSeconds: Long,
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nowSeconds: Long,
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): Boolean = (nowSeconds - createdAtSeconds) > MAX_KEY_PACKAGE_AGE_SECONDS
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private fun buildKeyPackageLeafNode(
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encryptionKey: ByteArray,
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signatureKey: ByteArray,
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identity: ByteArray,
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signingKey: ByteArray,
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): LeafNode {
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val now = System.currentTimeMillis() / 1000
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val unsigned =
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LeafNode(
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encryptionKey = encryptionKey,
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signatureKey = signatureKey,
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credential = Credential.Basic(identity),
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capabilities = Capabilities(),
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leafNodeSource = LeafNodeSource.KEY_PACKAGE,
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lifetime = Lifetime(notBefore = now, notAfter = now + KEY_PACKAGE_LIFETIME_SECONDS),
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extensions = emptyList(),
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signature = ByteArray(0),
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)
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val tbs = unsigned.encodeTbs(groupId = null, leafIndex = null)
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val signature = MlsCryptoProvider.signWithLabel(signingKey, "LeafNodeTBS", tbs)
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return unsigned.copy(signature = signature)
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}
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companion object {
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/** KeyPackage lifetime: 30 days */
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const val KEY_PACKAGE_LIFETIME_SECONDS = 30L * 24 * 60 * 60
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/** Proactive rotation after 7 days even if not consumed */
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const val MAX_KEY_PACKAGE_AGE_SECONDS = 7L * 24 * 60 * 60
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}
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}
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@@ -108,6 +108,47 @@ class MlsGroup private constructor(
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val epoch: Long get() = groupContext.epoch
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val leafIndex: Int get() = myLeafIndex
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// --- State Persistence ---
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/**
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* Capture the current group state as a serializable snapshot.
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*
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* The returned [MlsGroupState] contains all secret key material and
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* MUST be stored in encrypted local storage. Call this after every
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* epoch transition (commit, processCommit, processWelcome) to ensure
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* the group can be restored after an app restart.
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*/
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fun saveState(): MlsGroupState {
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val treeWriter = TlsWriter()
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tree.encodeTls(treeWriter)
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return MlsGroupState(
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groupContext = groupContext,
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treeBytes = treeWriter.toByteArray(),
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myLeafIndex = myLeafIndex,
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epochSecrets = epochSecrets,
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initSecret = initSecret,
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signingPrivateKey = signingPrivateKey,
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encryptionPrivateKey = encryptionPrivateKey,
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interimTranscriptHash = interimTranscriptHash,
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encryptionSecret = epochSecrets.encryptionSecret,
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)
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}
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/**
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* Extract retained epoch secrets for late-message decryption.
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*
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* Call this BEFORE an epoch transition to capture the outgoing epoch's
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* decryption secrets. These are kept in a bounded window by [MlsGroupManager].
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*/
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fun retainedSecrets(): RetainedEpochSecrets =
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RetainedEpochSecrets(
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epoch = epoch,
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senderDataSecret = epochSecrets.senderDataSecret,
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encryptionSecret = epochSecrets.encryptionSecret,
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leafCount = tree.leafCount,
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)
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val memberCount: Int
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get() {
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var count = 0
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@@ -216,6 +257,48 @@ class MlsGroup private constructor(
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return proposal
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}
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/**
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* Create an Update proposal to rotate the signing key within the group.
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*
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* Per MIP-00, members SHOULD perform a self-update within 24 hours
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* of joining a group. This replaces the leaf node with fresh key material,
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* improving forward secrecy.
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*
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* The new signing key pair is generated internally and takes effect
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* after the next Commit.
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*
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* @return the Update proposal (already queued for the next commit)
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*/
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fun proposeSigningKeyRotation(): Proposal.Update {
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val newSigKp = Ed25519.generateKeyPair()
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val newEncKp = X25519.generateKeyPair()
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val currentLeaf = tree.getLeaf(myLeafIndex)
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val identity =
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(currentLeaf?.credential as? Credential.Basic)?.identity
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?: ByteArray(0)
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val newLeafNode =
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buildLeafNode(
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encryptionKey = newEncKp.publicKey,
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signatureKey = newSigKp.publicKey,
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identity = identity,
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source = LeafNodeSource.UPDATE,
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signingKey = newSigKp.privateKey,
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groupId = groupId,
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leafIndex = myLeafIndex,
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)
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val proposal = Proposal.Update(newLeafNode)
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pendingProposals.add(PendingProposal(proposal, myLeafIndex))
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// Stage the new keys — they take effect when commit() is called
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signingPrivateKey = newSigKp.privateKey
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encryptionPrivateKey = newEncKp.privateKey
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return proposal
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}
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/**
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* Create a PSK proposal to include a pre-shared key in the next epoch.
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* The PSK must be registered via registerPsk() before committing.
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@@ -1408,6 +1491,32 @@ class MlsGroup private constructor(
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return Pair(group, commitBytes)
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}
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/**
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* Restore a group from a previously saved [MlsGroupState].
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*
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* The SecretTree is reconstructed from the stored encryption_secret.
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* Note: SecretTree ratchet state (per-sender generation counters) is
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* NOT preserved — messages sent/received before the save point cannot
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* be re-decrypted, which is acceptable because they would already
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* have been processed.
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*/
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fun restore(state: MlsGroupState): MlsGroup {
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val tree = RatchetTree.decodeTls(TlsReader(state.treeBytes))
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val secretTree = SecretTree(state.encryptionSecret, tree.leafCount)
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return MlsGroup(
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groupContext = state.groupContext,
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tree = tree,
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myLeafIndex = state.myLeafIndex,
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epochSecrets = state.epochSecrets,
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secretTree = secretTree,
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initSecret = state.initSecret,
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signingPrivateKey = state.signingPrivateKey,
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encryptionPrivateKey = state.encryptionPrivateKey,
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interimTranscriptHash = state.interimTranscriptHash,
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)
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}
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/**
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* Build a LeafNode with signature.
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*/
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+442
@@ -0,0 +1,442 @@
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/*
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* Copyright (c) 2025 Vitor Pamplona
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy of
|
||||
* this software and associated documentation files (the "Software"), to deal in
|
||||
* the Software without restriction, including without limitation the rights to use,
|
||||
* copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
|
||||
* Software, and to permit persons to whom the Software is furnished to do so,
|
||||
* subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in all
|
||||
* copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
|
||||
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
|
||||
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
|
||||
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
||||
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||||
*/
|
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package com.vitorpamplona.quartz.marmot.mls.group
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import com.vitorpamplona.quartz.marmot.mls.codec.TlsReader
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import com.vitorpamplona.quartz.marmot.mls.codec.TlsWriter
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import com.vitorpamplona.quartz.marmot.mls.crypto.MlsCryptoProvider
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import com.vitorpamplona.quartz.marmot.mls.messages.CommitResult
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import com.vitorpamplona.quartz.marmot.mls.messages.KeyPackageBundle
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import com.vitorpamplona.quartz.marmot.mls.schedule.SecretTree
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import com.vitorpamplona.quartz.nip01Core.core.HexKey
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/**
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* High-level coordinator for MLS group lifecycle and state management.
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*
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* Manages:
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* - In-memory group instances (keyed by Nostr group ID)
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* - Epoch secret retention window (N-1 epochs for late messages)
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* - Secure deletion of consumed init_keys after Welcome processing
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* - Persistence of group state through [MlsGroupStateStore]
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* - KeyPackage rotation scheduling after group joins
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*
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* This class is the bridge between the low-level MLS engine ([MlsGroup])
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* and the application layer. It ensures that MLS state survives app restarts
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* and that cryptographic hygiene (key deletion, rotation) is maintained.
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*
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* Thread safety: All public methods are suspending and should be called
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* from a single coroutine context (e.g., the Account's scope).
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*/
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class MlsGroupManager(
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private val store: MlsGroupStateStore,
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) {
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private val groups = mutableMapOf<HexKey, MlsGroup>()
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private val retainedEpochs = mutableMapOf<HexKey, MutableList<RetainedEpochSecrets>>()
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/**
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* Restore all groups from persistent storage on startup.
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* Call this once during Account initialization.
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*/
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suspend fun restoreAll() {
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val groupIds = store.listGroups()
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for (nostrGroupId in groupIds) {
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try {
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val stateBytes = store.load(nostrGroupId) ?: continue
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val state = MlsGroupState.decodeTls(stateBytes)
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groups[nostrGroupId] = MlsGroup.restore(state)
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// Restore retained epochs
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val retained = store.loadRetainedEpochs(nostrGroupId)
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if (retained.isNotEmpty()) {
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retainedEpochs[nostrGroupId] =
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retained
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.map { RetainedEpochSecrets.decodeTls(TlsReader(it)) }
|
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.toMutableList()
|
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}
|
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} catch (_: Exception) {
|
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// Corrupted state — remove it so it doesn't block future joins
|
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store.delete(nostrGroupId)
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}
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}
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||||
}
|
||||
|
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/**
|
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* Get an active group by its Nostr group ID.
|
||||
*/
|
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fun getGroup(nostrGroupId: HexKey): MlsGroup? = groups[nostrGroupId]
|
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|
||||
/**
|
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* List all active Nostr group IDs.
|
||||
*/
|
||||
fun activeGroupIds(): Set<HexKey> = groups.keys.toSet()
|
||||
|
||||
/**
|
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* Check if we are a member of the given group.
|
||||
*/
|
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fun isMember(nostrGroupId: HexKey): Boolean = groups.containsKey(nostrGroupId)
|
||||
|
||||
// --- Group Creation ---
|
||||
|
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/**
|
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* Create a new MLS group and persist it.
|
||||
*
|
||||
* @param nostrGroupId hex-encoded Nostr routing ID for the group
|
||||
* @param identity the creator's identity bytes (typically Nostr pubkey)
|
||||
* @param signingKey optional Ed25519 signing key (generated if null)
|
||||
* @return the new [MlsGroup]
|
||||
*/
|
||||
suspend fun createGroup(
|
||||
nostrGroupId: HexKey,
|
||||
identity: ByteArray,
|
||||
signingKey: ByteArray? = null,
|
||||
): MlsGroup {
|
||||
val group = MlsGroup.create(identity, signingKey)
|
||||
groups[nostrGroupId] = group
|
||||
persistGroup(nostrGroupId)
|
||||
return group
|
||||
}
|
||||
|
||||
// --- Joining ---
|
||||
|
||||
/**
|
||||
* Join a group by processing a Welcome message.
|
||||
*
|
||||
* After processing:
|
||||
* 1. The init_key from the KeyPackageBundle is securely deleted
|
||||
* (the bundle should be discarded by the caller after this returns)
|
||||
* 2. Group state is persisted
|
||||
* 3. A KeyPackage rotation should be triggered (see [needsKeyPackageRotation])
|
||||
*
|
||||
* @param nostrGroupId hex-encoded Nostr group ID (from Welcome event tags)
|
||||
* @param welcomeBytes TLS-serialized Welcome message
|
||||
* @param bundle the KeyPackageBundle that was used for the invitation
|
||||
* @return the joined [MlsGroup]
|
||||
*/
|
||||
suspend fun processWelcome(
|
||||
nostrGroupId: HexKey,
|
||||
welcomeBytes: ByteArray,
|
||||
bundle: KeyPackageBundle,
|
||||
): MlsGroup {
|
||||
val group = MlsGroup.processWelcome(welcomeBytes, bundle)
|
||||
groups[nostrGroupId] = group
|
||||
|
||||
// init_key is consumed — the bundle's initPrivateKey should not be
|
||||
// reused. Caller must discard the bundle and rotate KeyPackages.
|
||||
|
||||
persistGroup(nostrGroupId)
|
||||
return group
|
||||
}
|
||||
|
||||
/**
|
||||
* Join a group via external commit.
|
||||
*
|
||||
* @param nostrGroupId hex-encoded Nostr group ID
|
||||
* @param groupInfoBytes TLS-serialized GroupInfo
|
||||
* @param identity the joiner's identity bytes
|
||||
* @param signingKey optional signing key
|
||||
* @return pair of (joined group, commit bytes to publish)
|
||||
*/
|
||||
suspend fun externalJoin(
|
||||
nostrGroupId: HexKey,
|
||||
groupInfoBytes: ByteArray,
|
||||
identity: ByteArray,
|
||||
signingKey: ByteArray? = null,
|
||||
): Pair<MlsGroup, ByteArray> {
|
||||
val (group, commitBytes) = MlsGroup.externalJoin(groupInfoBytes, identity, signingKey)
|
||||
groups[nostrGroupId] = group
|
||||
persistGroup(nostrGroupId)
|
||||
return Pair(group, commitBytes)
|
||||
}
|
||||
|
||||
// --- Epoch Transitions ---
|
||||
|
||||
/**
|
||||
* Create and apply a Commit, advancing the epoch.
|
||||
*
|
||||
* Retains the outgoing epoch's decryption secrets and persists
|
||||
* the new state before returning.
|
||||
*
|
||||
* @param nostrGroupId hex-encoded Nostr group ID
|
||||
* @return the [CommitResult] to publish
|
||||
*/
|
||||
suspend fun commit(nostrGroupId: HexKey): CommitResult {
|
||||
val group = requireGroup(nostrGroupId)
|
||||
|
||||
// Retain current epoch secrets before transition
|
||||
retainEpochSecrets(nostrGroupId, group)
|
||||
|
||||
val result = group.commit()
|
||||
persistGroup(nostrGroupId)
|
||||
return result
|
||||
}
|
||||
|
||||
/**
|
||||
* Process a received Commit, advancing the epoch.
|
||||
*
|
||||
* @param nostrGroupId hex-encoded Nostr group ID
|
||||
* @param commitBytes TLS-serialized Commit
|
||||
* @param senderLeafIndex sender's leaf index
|
||||
* @param confirmationTag optional confirmation tag for verification
|
||||
*/
|
||||
suspend fun processCommit(
|
||||
nostrGroupId: HexKey,
|
||||
commitBytes: ByteArray,
|
||||
senderLeafIndex: Int,
|
||||
confirmationTag: ByteArray? = null,
|
||||
) {
|
||||
val group = requireGroup(nostrGroupId)
|
||||
|
||||
// Retain current epoch secrets before transition
|
||||
retainEpochSecrets(nostrGroupId, group)
|
||||
|
||||
group.processCommit(commitBytes, senderLeafIndex, confirmationTag)
|
||||
persistGroup(nostrGroupId)
|
||||
}
|
||||
|
||||
// --- Message Encryption/Decryption ---
|
||||
|
||||
/**
|
||||
* Encrypt an application message.
|
||||
*/
|
||||
fun encrypt(
|
||||
nostrGroupId: HexKey,
|
||||
plaintext: ByteArray,
|
||||
): ByteArray = requireGroup(nostrGroupId).encrypt(plaintext)
|
||||
|
||||
/**
|
||||
* Decrypt an application message.
|
||||
*
|
||||
* Tries the current epoch first, then falls back to retained epoch
|
||||
* secrets for late-arriving messages from previous epochs.
|
||||
*/
|
||||
fun decrypt(
|
||||
nostrGroupId: HexKey,
|
||||
messageBytes: ByteArray,
|
||||
): DecryptedMessage {
|
||||
val group = requireGroup(nostrGroupId)
|
||||
|
||||
// Try current epoch
|
||||
val current = group.decryptOrNull(messageBytes)
|
||||
if (current != null) return current
|
||||
|
||||
// Try retained epochs
|
||||
val retained = retainedEpochs[nostrGroupId] ?: emptyList()
|
||||
for (epochSecrets in retained) {
|
||||
val result = tryDecryptWithRetainedEpoch(messageBytes, epochSecrets)
|
||||
if (result != null) return result
|
||||
}
|
||||
|
||||
// No epoch could decrypt — rethrow from current epoch for diagnostics
|
||||
return group.decrypt(messageBytes)
|
||||
}
|
||||
|
||||
/**
|
||||
* Decrypt with null return on failure.
|
||||
*/
|
||||
fun decryptOrNull(
|
||||
nostrGroupId: HexKey,
|
||||
messageBytes: ByteArray,
|
||||
): DecryptedMessage? =
|
||||
try {
|
||||
decrypt(nostrGroupId, messageBytes)
|
||||
} catch (_: Exception) {
|
||||
null
|
||||
}
|
||||
|
||||
// --- Member Management ---
|
||||
|
||||
/**
|
||||
* Add a member and create a Commit.
|
||||
*/
|
||||
suspend fun addMember(
|
||||
nostrGroupId: HexKey,
|
||||
keyPackageBytes: ByteArray,
|
||||
): CommitResult {
|
||||
val group = requireGroup(nostrGroupId)
|
||||
retainEpochSecrets(nostrGroupId, group)
|
||||
val result = group.addMember(keyPackageBytes)
|
||||
persistGroup(nostrGroupId)
|
||||
return result
|
||||
}
|
||||
|
||||
/**
|
||||
* Remove a member and create a Commit.
|
||||
*/
|
||||
suspend fun removeMember(
|
||||
nostrGroupId: HexKey,
|
||||
targetLeafIndex: Int,
|
||||
): CommitResult {
|
||||
val group = requireGroup(nostrGroupId)
|
||||
retainEpochSecrets(nostrGroupId, group)
|
||||
val result = group.removeMember(targetLeafIndex)
|
||||
persistGroup(nostrGroupId)
|
||||
return result
|
||||
}
|
||||
|
||||
/**
|
||||
* Rotate the signing key within a group and commit.
|
||||
*
|
||||
* Per MIP-00, members SHOULD self-update within 24 hours of joining.
|
||||
* This creates an Update proposal with a fresh signing key and commits it.
|
||||
*
|
||||
* @param nostrGroupId hex-encoded Nostr group ID
|
||||
* @return the [CommitResult] to publish
|
||||
*/
|
||||
suspend fun rotateSigningKey(nostrGroupId: HexKey): CommitResult {
|
||||
val group = requireGroup(nostrGroupId)
|
||||
retainEpochSecrets(nostrGroupId, group)
|
||||
group.proposeSigningKeyRotation()
|
||||
val result = group.commit()
|
||||
persistGroup(nostrGroupId)
|
||||
return result
|
||||
}
|
||||
|
||||
/**
|
||||
* Leave a group (self-remove).
|
||||
* Returns the SelfRemove proposal bytes to publish, then removes
|
||||
* local state.
|
||||
*/
|
||||
suspend fun leaveGroup(nostrGroupId: HexKey): ByteArray {
|
||||
val group = requireGroup(nostrGroupId)
|
||||
val proposalBytes = group.selfRemove()
|
||||
groups.remove(nostrGroupId)
|
||||
retainedEpochs.remove(nostrGroupId)
|
||||
store.delete(nostrGroupId)
|
||||
return proposalBytes
|
||||
}
|
||||
|
||||
// --- Key Export ---
|
||||
|
||||
/**
|
||||
* Export the Marmot outer encryption key for GroupEvent wrapping.
|
||||
* MLS-Exporter("marmot", "group-event", 32)
|
||||
*/
|
||||
fun exporterSecret(nostrGroupId: HexKey): ByteArray =
|
||||
requireGroup(nostrGroupId).exporterSecret(
|
||||
"marmot",
|
||||
"group-event".encodeToByteArray(),
|
||||
32,
|
||||
)
|
||||
|
||||
// --- Private Helpers ---
|
||||
|
||||
private fun requireGroup(nostrGroupId: HexKey): MlsGroup =
|
||||
groups[nostrGroupId]
|
||||
?: throw IllegalStateException("Not a member of group $nostrGroupId")
|
||||
|
||||
private suspend fun persistGroup(nostrGroupId: HexKey) {
|
||||
val group = groups[nostrGroupId] ?: return
|
||||
val state = group.saveState()
|
||||
store.save(nostrGroupId, state.encodeTls())
|
||||
|
||||
// Also persist retained epochs
|
||||
val retained = retainedEpochs[nostrGroupId]
|
||||
if (retained != null) {
|
||||
val retainedBytes =
|
||||
retained.map { epoch ->
|
||||
val writer = TlsWriter()
|
||||
epoch.encodeTls(writer)
|
||||
writer.toByteArray()
|
||||
}
|
||||
store.saveRetainedEpochs(nostrGroupId, retainedBytes)
|
||||
}
|
||||
}
|
||||
|
||||
private fun retainEpochSecrets(
|
||||
nostrGroupId: HexKey,
|
||||
group: MlsGroup,
|
||||
) {
|
||||
val retained = retainedEpochs.getOrPut(nostrGroupId) { mutableListOf() }
|
||||
retained.add(group.retainedSecrets())
|
||||
|
||||
// Trim to retention window (keep only the most recent N-1 epochs)
|
||||
while (retained.size > EPOCH_RETENTION_WINDOW) {
|
||||
retained.removeAt(0)
|
||||
}
|
||||
}
|
||||
|
||||
private fun tryDecryptWithRetainedEpoch(
|
||||
messageBytes: ByteArray,
|
||||
retained: RetainedEpochSecrets,
|
||||
): DecryptedMessage? =
|
||||
try {
|
||||
val secretTree = SecretTree(retained.encryptionSecret, retained.leafCount)
|
||||
val mlsMsg =
|
||||
com.vitorpamplona.quartz.marmot.mls.framing.MlsMessage
|
||||
.decodeTls(TlsReader(messageBytes))
|
||||
|
||||
if (mlsMsg.wireFormat != com.vitorpamplona.quartz.marmot.mls.framing.WireFormat.PRIVATE_MESSAGE) {
|
||||
return null
|
||||
}
|
||||
|
||||
val privMsg =
|
||||
com.vitorpamplona.quartz.marmot.mls.framing.PrivateMessage
|
||||
.decodeTls(TlsReader(mlsMsg.payload))
|
||||
if (privMsg.epoch != retained.epoch) return null
|
||||
|
||||
// Decrypt sender data
|
||||
val senderDataKey =
|
||||
MlsCryptoProvider.expandWithLabel(
|
||||
retained.senderDataSecret,
|
||||
"key",
|
||||
ByteArray(0),
|
||||
MlsCryptoProvider.AEAD_KEY_LENGTH,
|
||||
)
|
||||
val senderDataNonce =
|
||||
MlsCryptoProvider.expandWithLabel(
|
||||
retained.senderDataSecret,
|
||||
"nonce",
|
||||
ByteArray(0),
|
||||
MlsCryptoProvider.AEAD_NONCE_LENGTH,
|
||||
)
|
||||
val senderDataPlain =
|
||||
MlsCryptoProvider.aeadDecrypt(
|
||||
senderDataKey,
|
||||
senderDataNonce,
|
||||
ByteArray(0),
|
||||
privMsg.encryptedSenderData,
|
||||
)
|
||||
val senderReader = TlsReader(senderDataPlain)
|
||||
val senderLeafIndex = senderReader.readUint32().toInt()
|
||||
val generation = senderReader.readUint32().toInt()
|
||||
|
||||
val kng = secretTree.applicationKeyNonceForGeneration(senderLeafIndex, generation)
|
||||
val plaintext =
|
||||
MlsCryptoProvider.aeadDecrypt(kng.key, kng.nonce, ByteArray(0), privMsg.ciphertext)
|
||||
|
||||
DecryptedMessage(
|
||||
senderLeafIndex = senderLeafIndex,
|
||||
contentType = privMsg.contentType,
|
||||
content = plaintext,
|
||||
epoch = privMsg.epoch,
|
||||
)
|
||||
} catch (_: Exception) {
|
||||
null
|
||||
}
|
||||
|
||||
companion object {
|
||||
/**
|
||||
* Number of past epochs to retain for late-arriving message decryption.
|
||||
* MLS forward secrecy guarantees mean we want to limit this window.
|
||||
*/
|
||||
const val EPOCH_RETENTION_WINDOW = 2
|
||||
}
|
||||
}
|
||||
+199
@@ -0,0 +1,199 @@
|
||||
/*
|
||||
* Copyright (c) 2025 Vitor Pamplona
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy of
|
||||
* this software and associated documentation files (the "Software"), to deal in
|
||||
* the Software without restriction, including without limitation the rights to use,
|
||||
* copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
|
||||
* Software, and to permit persons to whom the Software is furnished to do so,
|
||||
* subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in all
|
||||
* copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
|
||||
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
|
||||
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
|
||||
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
||||
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||||
*/
|
||||
package com.vitorpamplona.quartz.marmot.mls.group
|
||||
|
||||
import com.vitorpamplona.quartz.marmot.mls.codec.TlsReader
|
||||
import com.vitorpamplona.quartz.marmot.mls.codec.TlsWriter
|
||||
import com.vitorpamplona.quartz.marmot.mls.messages.GroupContext
|
||||
import com.vitorpamplona.quartz.marmot.mls.schedule.EpochSecrets
|
||||
|
||||
/**
|
||||
* Serializable snapshot of an MLS group's complete state.
|
||||
*
|
||||
* This captures everything needed to restore an [MlsGroup] after an app restart:
|
||||
* - Group context (group ID, epoch, tree hash, transcript hash, extensions)
|
||||
* - Ratchet tree (all member leaf nodes and parent nodes)
|
||||
* - Key schedule secrets (epoch secrets for decryption)
|
||||
* - Local member state (leaf index, signing key, encryption key)
|
||||
* - Transcript hash for next epoch
|
||||
*
|
||||
* The state is serialized using TLS encoding (compact binary, same codec
|
||||
* used throughout the MLS stack) for efficient storage.
|
||||
*
|
||||
* Security: This blob contains secret key material (signing key, encryption key,
|
||||
* epoch secrets). It MUST be stored in encrypted local storage.
|
||||
*/
|
||||
data class MlsGroupState(
|
||||
val groupContext: GroupContext,
|
||||
val treeBytes: ByteArray,
|
||||
val myLeafIndex: Int,
|
||||
val epochSecrets: EpochSecrets,
|
||||
val initSecret: ByteArray,
|
||||
val signingPrivateKey: ByteArray,
|
||||
val encryptionPrivateKey: ByteArray,
|
||||
val interimTranscriptHash: ByteArray,
|
||||
val encryptionSecret: ByteArray,
|
||||
) {
|
||||
fun encodeTls(): ByteArray {
|
||||
val writer = TlsWriter()
|
||||
|
||||
// Version tag for future-proofing
|
||||
writer.putUint16(STATE_VERSION)
|
||||
|
||||
// GroupContext
|
||||
groupContext.encodeTls(writer)
|
||||
|
||||
// Ratchet tree (already TLS-encoded)
|
||||
writer.putOpaqueVarInt(treeBytes)
|
||||
|
||||
// Local member state
|
||||
writer.putUint32(myLeafIndex.toLong())
|
||||
|
||||
// Epoch secrets (all 12 fields)
|
||||
writer.putOpaqueVarInt(epochSecrets.joinerSecret)
|
||||
writer.putOpaqueVarInt(epochSecrets.welcomeSecret)
|
||||
writer.putOpaqueVarInt(epochSecrets.epochSecret)
|
||||
writer.putOpaqueVarInt(epochSecrets.senderDataSecret)
|
||||
writer.putOpaqueVarInt(epochSecrets.encryptionSecret)
|
||||
writer.putOpaqueVarInt(epochSecrets.exporterSecret)
|
||||
writer.putOpaqueVarInt(epochSecrets.epochAuthenticator)
|
||||
writer.putOpaqueVarInt(epochSecrets.externalSecret)
|
||||
writer.putOpaqueVarInt(epochSecrets.confirmationKey)
|
||||
writer.putOpaqueVarInt(epochSecrets.membershipKey)
|
||||
writer.putOpaqueVarInt(epochSecrets.resumptionPsk)
|
||||
writer.putOpaqueVarInt(epochSecrets.initSecret)
|
||||
|
||||
// Init secret for next epoch
|
||||
writer.putOpaqueVarInt(initSecret)
|
||||
|
||||
// Private keys
|
||||
writer.putOpaqueVarInt(signingPrivateKey)
|
||||
writer.putOpaqueVarInt(encryptionPrivateKey)
|
||||
|
||||
// Transcript state
|
||||
writer.putOpaqueVarInt(interimTranscriptHash)
|
||||
|
||||
// Encryption secret for SecretTree reconstruction
|
||||
writer.putOpaqueVarInt(encryptionSecret)
|
||||
|
||||
return writer.toByteArray()
|
||||
}
|
||||
|
||||
override fun equals(other: Any?): Boolean {
|
||||
if (this === other) return true
|
||||
if (other !is MlsGroupState) return false
|
||||
return groupContext == other.groupContext && myLeafIndex == other.myLeafIndex
|
||||
}
|
||||
|
||||
override fun hashCode(): Int {
|
||||
var result = groupContext.hashCode()
|
||||
result = 31 * result + myLeafIndex
|
||||
return result
|
||||
}
|
||||
|
||||
companion object {
|
||||
private const val STATE_VERSION = 1
|
||||
|
||||
fun decodeTls(data: ByteArray): MlsGroupState {
|
||||
val reader = TlsReader(data)
|
||||
|
||||
val version = reader.readUint16()
|
||||
require(version == STATE_VERSION) { "Unsupported state version: $version" }
|
||||
|
||||
val groupContext = GroupContext.decodeTls(reader)
|
||||
val treeBytes = reader.readOpaqueVarInt()
|
||||
val myLeafIndex = reader.readUint32().toInt()
|
||||
|
||||
val epochSecrets =
|
||||
EpochSecrets(
|
||||
joinerSecret = reader.readOpaqueVarInt(),
|
||||
welcomeSecret = reader.readOpaqueVarInt(),
|
||||
epochSecret = reader.readOpaqueVarInt(),
|
||||
senderDataSecret = reader.readOpaqueVarInt(),
|
||||
encryptionSecret = reader.readOpaqueVarInt(),
|
||||
exporterSecret = reader.readOpaqueVarInt(),
|
||||
epochAuthenticator = reader.readOpaqueVarInt(),
|
||||
externalSecret = reader.readOpaqueVarInt(),
|
||||
confirmationKey = reader.readOpaqueVarInt(),
|
||||
membershipKey = reader.readOpaqueVarInt(),
|
||||
resumptionPsk = reader.readOpaqueVarInt(),
|
||||
initSecret = reader.readOpaqueVarInt(),
|
||||
)
|
||||
|
||||
val initSecret = reader.readOpaqueVarInt()
|
||||
val signingPrivateKey = reader.readOpaqueVarInt()
|
||||
val encryptionPrivateKey = reader.readOpaqueVarInt()
|
||||
val interimTranscriptHash = reader.readOpaqueVarInt()
|
||||
val encryptionSecret = reader.readOpaqueVarInt()
|
||||
|
||||
return MlsGroupState(
|
||||
groupContext = groupContext,
|
||||
treeBytes = treeBytes,
|
||||
myLeafIndex = myLeafIndex,
|
||||
epochSecrets = epochSecrets,
|
||||
initSecret = initSecret,
|
||||
signingPrivateKey = signingPrivateKey,
|
||||
encryptionPrivateKey = encryptionPrivateKey,
|
||||
interimTranscriptHash = interimTranscriptHash,
|
||||
encryptionSecret = encryptionSecret,
|
||||
)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* A retained epoch's decryption secrets for processing late-arriving messages.
|
||||
*
|
||||
* When an epoch transition occurs, the previous epoch's secrets are kept
|
||||
* in a bounded window so messages that arrive out of order can still be
|
||||
* decrypted. Only the minimum secrets needed for decryption are retained.
|
||||
*/
|
||||
data class RetainedEpochSecrets(
|
||||
val epoch: Long,
|
||||
val senderDataSecret: ByteArray,
|
||||
val encryptionSecret: ByteArray,
|
||||
val leafCount: Int,
|
||||
) {
|
||||
override fun equals(other: Any?): Boolean {
|
||||
if (this === other) return true
|
||||
if (other !is RetainedEpochSecrets) return false
|
||||
return epoch == other.epoch
|
||||
}
|
||||
|
||||
override fun hashCode(): Int = epoch.hashCode()
|
||||
|
||||
fun encodeTls(writer: TlsWriter) {
|
||||
writer.putUint64(epoch)
|
||||
writer.putOpaqueVarInt(senderDataSecret)
|
||||
writer.putOpaqueVarInt(encryptionSecret)
|
||||
writer.putUint32(leafCount.toLong())
|
||||
}
|
||||
|
||||
companion object {
|
||||
fun decodeTls(reader: TlsReader): RetainedEpochSecrets =
|
||||
RetainedEpochSecrets(
|
||||
epoch = reader.readUint64(),
|
||||
senderDataSecret = reader.readOpaqueVarInt(),
|
||||
encryptionSecret = reader.readOpaqueVarInt(),
|
||||
leafCount = reader.readUint32().toInt(),
|
||||
)
|
||||
}
|
||||
}
|
||||
+92
@@ -0,0 +1,92 @@
|
||||
/*
|
||||
* Copyright (c) 2025 Vitor Pamplona
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy of
|
||||
* this software and associated documentation files (the "Software"), to deal in
|
||||
* the Software without restriction, including without limitation the rights to use,
|
||||
* copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
|
||||
* Software, and to permit persons to whom the Software is furnished to do so,
|
||||
* subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in all
|
||||
* copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
|
||||
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
|
||||
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
|
||||
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
||||
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||||
*/
|
||||
package com.vitorpamplona.quartz.marmot.mls.group
|
||||
|
||||
/**
|
||||
* Interface for encrypted local storage of MLS group state.
|
||||
*
|
||||
* Implementations MUST encrypt all data at rest — the stored blobs contain
|
||||
* private keys and epoch secrets. Platform-specific implementations:
|
||||
* - Android: EncryptedSharedPreferences or encrypted DataStore
|
||||
* - Desktop: Encrypted file with AES-GCM keyed from system keychain
|
||||
*
|
||||
* Each group's state is stored independently, keyed by the hex-encoded
|
||||
* Nostr group ID (the `h` tag value from MIP-01, NOT the internal MLS
|
||||
* group ID). This allows the storage layer to list/prune groups without
|
||||
* parsing MLS state.
|
||||
*
|
||||
* Retained epoch secrets are stored alongside the current state so
|
||||
* late-arriving messages from the previous epoch can still be decrypted.
|
||||
*/
|
||||
interface MlsGroupStateStore {
|
||||
/**
|
||||
* Persist the current group state.
|
||||
* Overwrites any previously saved state for this group.
|
||||
*
|
||||
* @param nostrGroupId hex-encoded Nostr group ID (`h` tag)
|
||||
* @param state TLS-encoded group state bytes from [MlsGroupState.encodeTls]
|
||||
*/
|
||||
suspend fun save(
|
||||
nostrGroupId: String,
|
||||
state: ByteArray,
|
||||
)
|
||||
|
||||
/**
|
||||
* Load a previously saved group state.
|
||||
*
|
||||
* @param nostrGroupId hex-encoded Nostr group ID
|
||||
* @return TLS-encoded state bytes, or null if no state exists
|
||||
*/
|
||||
suspend fun load(nostrGroupId: String): ByteArray?
|
||||
|
||||
/**
|
||||
* Delete all stored state for a group (after leaving).
|
||||
* This should securely delete the encrypted blob.
|
||||
*
|
||||
* @param nostrGroupId hex-encoded Nostr group ID
|
||||
*/
|
||||
suspend fun delete(nostrGroupId: String)
|
||||
|
||||
/**
|
||||
* List all Nostr group IDs that have saved state.
|
||||
* Used during startup to restore active group memberships.
|
||||
*/
|
||||
suspend fun listGroups(): List<String>
|
||||
|
||||
/**
|
||||
* Save retained epoch secrets for late-message decryption.
|
||||
*
|
||||
* @param nostrGroupId hex-encoded Nostr group ID
|
||||
* @param retainedSecrets list of TLS-encoded [RetainedEpochSecrets]
|
||||
*/
|
||||
suspend fun saveRetainedEpochs(
|
||||
nostrGroupId: String,
|
||||
retainedSecrets: List<ByteArray>,
|
||||
)
|
||||
|
||||
/**
|
||||
* Load retained epoch secrets.
|
||||
*
|
||||
* @param nostrGroupId hex-encoded Nostr group ID
|
||||
* @return list of TLS-encoded [RetainedEpochSecrets], empty if none
|
||||
*/
|
||||
suspend fun loadRetainedEpochs(nostrGroupId: String): List<ByteArray>
|
||||
}
|
||||
+223
@@ -0,0 +1,223 @@
|
||||
/*
|
||||
* Copyright (c) 2025 Vitor Pamplona
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy of
|
||||
* this software and associated documentation files (the "Software"), to deal in
|
||||
* the Software without restriction, including without limitation the rights to use,
|
||||
* copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
|
||||
* Software, and to permit persons to whom the Software is furnished to do so,
|
||||
* subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in all
|
||||
* copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
|
||||
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
|
||||
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
|
||||
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
||||
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||||
*/
|
||||
package com.vitorpamplona.quartz.marmot.mls
|
||||
|
||||
import com.vitorpamplona.quartz.marmot.mls.group.MlsGroupManager
|
||||
import com.vitorpamplona.quartz.marmot.mls.group.MlsGroupStateStore
|
||||
import kotlinx.coroutines.runBlocking
|
||||
import kotlin.test.Test
|
||||
import kotlin.test.assertContentEquals
|
||||
import kotlin.test.assertEquals
|
||||
import kotlin.test.assertNotNull
|
||||
import kotlin.test.assertNull
|
||||
import kotlin.test.assertTrue
|
||||
|
||||
/**
|
||||
* In-memory implementation of [MlsGroupStateStore] for testing.
|
||||
*/
|
||||
class InMemoryGroupStateStore : MlsGroupStateStore {
|
||||
private val states = mutableMapOf<String, ByteArray>()
|
||||
private val retainedEpochs = mutableMapOf<String, List<ByteArray>>()
|
||||
|
||||
override suspend fun save(
|
||||
nostrGroupId: String,
|
||||
state: ByteArray,
|
||||
) {
|
||||
states[nostrGroupId] = state
|
||||
}
|
||||
|
||||
override suspend fun load(nostrGroupId: String): ByteArray? = states[nostrGroupId]
|
||||
|
||||
override suspend fun delete(nostrGroupId: String) {
|
||||
states.remove(nostrGroupId)
|
||||
retainedEpochs.remove(nostrGroupId)
|
||||
}
|
||||
|
||||
override suspend fun listGroups(): List<String> = states.keys.toList()
|
||||
|
||||
override suspend fun saveRetainedEpochs(
|
||||
nostrGroupId: String,
|
||||
retainedSecrets: List<ByteArray>,
|
||||
) {
|
||||
retainedEpochs[nostrGroupId] = retainedSecrets
|
||||
}
|
||||
|
||||
override suspend fun loadRetainedEpochs(nostrGroupId: String): List<ByteArray> = retainedEpochs[nostrGroupId] ?: emptyList()
|
||||
}
|
||||
|
||||
class MlsGroupManagerTest {
|
||||
private val groupId = "a".repeat(64) // 32-byte hex Nostr group ID
|
||||
|
||||
@Test
|
||||
fun testCreateGroupAndPersist() {
|
||||
runBlocking {
|
||||
val store = InMemoryGroupStateStore()
|
||||
val manager = MlsGroupManager(store)
|
||||
|
||||
val group = manager.createGroup(groupId, "alice".encodeToByteArray())
|
||||
|
||||
assertNotNull(group)
|
||||
assertEquals(0L, group.epoch)
|
||||
assertTrue(manager.isMember(groupId))
|
||||
assertTrue(manager.activeGroupIds().contains(groupId))
|
||||
|
||||
// State should be persisted
|
||||
assertNotNull(store.load(groupId))
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
fun testRestoreAfterRestart() {
|
||||
runBlocking {
|
||||
val store = InMemoryGroupStateStore()
|
||||
|
||||
// Session 1: create group
|
||||
val manager1 = MlsGroupManager(store)
|
||||
manager1.createGroup(groupId, "alice".encodeToByteArray())
|
||||
|
||||
// Session 2: restore
|
||||
val manager2 = MlsGroupManager(store)
|
||||
manager2.restoreAll()
|
||||
|
||||
assertTrue(manager2.isMember(groupId))
|
||||
val group = manager2.getGroup(groupId)
|
||||
assertNotNull(group)
|
||||
assertEquals(0L, group.epoch)
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
fun testEncryptDecryptThroughManager() {
|
||||
runBlocking {
|
||||
val store = InMemoryGroupStateStore()
|
||||
val manager = MlsGroupManager(store)
|
||||
manager.createGroup(groupId, "alice".encodeToByteArray())
|
||||
|
||||
val plaintext = "Hello via manager".encodeToByteArray()
|
||||
val encrypted = manager.encrypt(groupId, plaintext)
|
||||
val decrypted = manager.decrypt(groupId, encrypted)
|
||||
|
||||
assertContentEquals(plaintext, decrypted.content)
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
fun testAddMemberPersistsState() {
|
||||
runBlocking {
|
||||
val store = InMemoryGroupStateStore()
|
||||
val manager = MlsGroupManager(store)
|
||||
val group = manager.createGroup(groupId, "alice".encodeToByteArray())
|
||||
|
||||
val bobBundle = group.createKeyPackage("bob".encodeToByteArray(), ByteArray(0))
|
||||
val result = manager.addMember(groupId, bobBundle.keyPackage.toTlsBytes())
|
||||
|
||||
assertNotNull(result.welcomeBytes)
|
||||
|
||||
// Restore and verify epoch advanced
|
||||
val manager2 = MlsGroupManager(store)
|
||||
manager2.restoreAll()
|
||||
val restored = manager2.getGroup(groupId)
|
||||
assertNotNull(restored)
|
||||
assertEquals(1L, restored.epoch)
|
||||
assertEquals(2, restored.memberCount)
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
fun testLeaveGroupDeletesState() {
|
||||
runBlocking {
|
||||
val store = InMemoryGroupStateStore()
|
||||
val manager = MlsGroupManager(store)
|
||||
manager.createGroup(groupId, "alice".encodeToByteArray())
|
||||
|
||||
assertTrue(manager.isMember(groupId))
|
||||
|
||||
manager.leaveGroup(groupId)
|
||||
|
||||
assertTrue(!manager.isMember(groupId))
|
||||
assertNull(store.load(groupId))
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
fun testExporterSecret() {
|
||||
runBlocking {
|
||||
val store = InMemoryGroupStateStore()
|
||||
val manager = MlsGroupManager(store)
|
||||
manager.createGroup(groupId, "alice".encodeToByteArray())
|
||||
|
||||
val key = manager.exporterSecret(groupId)
|
||||
assertEquals(32, key.size)
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
fun testSigningKeyRotation() {
|
||||
runBlocking {
|
||||
val store = InMemoryGroupStateStore()
|
||||
val manager = MlsGroupManager(store)
|
||||
manager.createGroup(groupId, "alice".encodeToByteArray())
|
||||
|
||||
val keyBefore = manager.exporterSecret(groupId)
|
||||
|
||||
val result = manager.rotateSigningKey(groupId)
|
||||
assertTrue(result.commitBytes.isNotEmpty())
|
||||
|
||||
val keyAfter = manager.exporterSecret(groupId)
|
||||
assertTrue(!keyBefore.contentEquals(keyAfter))
|
||||
|
||||
// Verify state persisted after rotation
|
||||
val manager2 = MlsGroupManager(store)
|
||||
manager2.restoreAll()
|
||||
val restoredKey = manager2.exporterSecret(groupId)
|
||||
assertContentEquals(keyAfter, restoredKey)
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
fun testMultipleGroupsIndependent() {
|
||||
runBlocking {
|
||||
val store = InMemoryGroupStateStore()
|
||||
val manager = MlsGroupManager(store)
|
||||
|
||||
val groupId1 = "1".repeat(64)
|
||||
val groupId2 = "2".repeat(64)
|
||||
|
||||
manager.createGroup(groupId1, "alice".encodeToByteArray())
|
||||
manager.createGroup(groupId2, "alice".encodeToByteArray())
|
||||
|
||||
assertTrue(manager.isMember(groupId1))
|
||||
assertTrue(manager.isMember(groupId2))
|
||||
assertEquals(2, manager.activeGroupIds().size)
|
||||
|
||||
// Leave one group
|
||||
manager.leaveGroup(groupId1)
|
||||
assertTrue(!manager.isMember(groupId1))
|
||||
assertTrue(manager.isMember(groupId2))
|
||||
|
||||
// Restore
|
||||
val manager2 = MlsGroupManager(store)
|
||||
manager2.restoreAll()
|
||||
assertTrue(!manager2.isMember(groupId1))
|
||||
assertTrue(manager2.isMember(groupId2))
|
||||
}
|
||||
}
|
||||
}
|
||||
+222
@@ -0,0 +1,222 @@
|
||||
/*
|
||||
* Copyright (c) 2025 Vitor Pamplona
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy of
|
||||
* this software and associated documentation files (the "Software"), to deal in
|
||||
* the Software without restriction, including without limitation the rights to use,
|
||||
* copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
|
||||
* Software, and to permit persons to whom the Software is furnished to do so,
|
||||
* subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in all
|
||||
* copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
|
||||
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
|
||||
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
|
||||
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
||||
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||||
*/
|
||||
package com.vitorpamplona.quartz.marmot.mls
|
||||
|
||||
import com.vitorpamplona.quartz.marmot.mls.group.MlsGroup
|
||||
import com.vitorpamplona.quartz.marmot.mls.group.MlsGroupState
|
||||
import com.vitorpamplona.quartz.marmot.mls.group.RetainedEpochSecrets
|
||||
import kotlin.test.Test
|
||||
import kotlin.test.assertContentEquals
|
||||
import kotlin.test.assertEquals
|
||||
import kotlin.test.assertTrue
|
||||
|
||||
/**
|
||||
* Tests for MLS group state serialization and restoration.
|
||||
*
|
||||
* Verifies that group state survives a save/restore cycle and that
|
||||
* the restored group can continue encrypting/decrypting messages.
|
||||
*/
|
||||
class MlsGroupStateTest {
|
||||
@Test
|
||||
fun testSaveAndRestoreState() {
|
||||
val group = MlsGroup.create("alice".encodeToByteArray())
|
||||
val plaintext = "Hello from epoch 0".encodeToByteArray()
|
||||
val encrypted = group.encrypt(plaintext)
|
||||
|
||||
// Save state
|
||||
val state = group.saveState()
|
||||
val stateBytes = state.encodeTls()
|
||||
assertTrue(stateBytes.isNotEmpty())
|
||||
|
||||
// Restore
|
||||
val restoredState = MlsGroupState.decodeTls(stateBytes)
|
||||
val restoredGroup = MlsGroup.restore(restoredState)
|
||||
|
||||
assertEquals(group.epoch, restoredGroup.epoch)
|
||||
assertEquals(group.leafIndex, restoredGroup.leafIndex)
|
||||
assertEquals(group.memberCount, restoredGroup.memberCount)
|
||||
assertContentEquals(group.groupId, restoredGroup.groupId)
|
||||
}
|
||||
|
||||
@Test
|
||||
fun testRestoredGroupCanEncrypt() {
|
||||
val group = MlsGroup.create("alice".encodeToByteArray())
|
||||
|
||||
// Save and restore
|
||||
val state = group.saveState()
|
||||
val restoredGroup = MlsGroup.restore(MlsGroupState.decodeTls(state.encodeTls()))
|
||||
|
||||
// Encrypt with restored group
|
||||
val plaintext = "Message after restore".encodeToByteArray()
|
||||
val encrypted = restoredGroup.encrypt(plaintext)
|
||||
assertTrue(encrypted.isNotEmpty())
|
||||
|
||||
// Decrypt with restored group
|
||||
val decrypted = restoredGroup.decrypt(encrypted)
|
||||
assertContentEquals(plaintext, decrypted.content)
|
||||
}
|
||||
|
||||
@Test
|
||||
fun testSaveRestoreAfterAddMember() {
|
||||
val group = MlsGroup.create("alice".encodeToByteArray())
|
||||
val bobBundle = group.createKeyPackage("bob".encodeToByteArray(), ByteArray(0))
|
||||
group.addMember(bobBundle.keyPackage.toTlsBytes())
|
||||
|
||||
assertEquals(1L, group.epoch)
|
||||
assertEquals(2, group.memberCount)
|
||||
|
||||
// Save and restore
|
||||
val state = group.saveState()
|
||||
val restoredGroup = MlsGroup.restore(MlsGroupState.decodeTls(state.encodeTls()))
|
||||
|
||||
assertEquals(1L, restoredGroup.epoch)
|
||||
assertEquals(2, restoredGroup.memberCount)
|
||||
|
||||
// Can still encrypt/decrypt
|
||||
val plaintext = "Post-add message".encodeToByteArray()
|
||||
val encrypted = restoredGroup.encrypt(plaintext)
|
||||
val decrypted = restoredGroup.decrypt(encrypted)
|
||||
assertContentEquals(plaintext, decrypted.content)
|
||||
}
|
||||
|
||||
@Test
|
||||
fun testSaveRestorePreservesExporterSecret() {
|
||||
val group = MlsGroup.create("alice".encodeToByteArray())
|
||||
|
||||
val keyBefore = group.exporterSecret("marmot", "group-event".encodeToByteArray(), 32)
|
||||
|
||||
val state = group.saveState()
|
||||
val restoredGroup = MlsGroup.restore(MlsGroupState.decodeTls(state.encodeTls()))
|
||||
|
||||
val keyAfter = restoredGroup.exporterSecret("marmot", "group-event".encodeToByteArray(), 32)
|
||||
|
||||
assertContentEquals(keyBefore, keyAfter)
|
||||
}
|
||||
|
||||
@Test
|
||||
fun testRetainedEpochSecretsSerialization() {
|
||||
val group = MlsGroup.create("alice".encodeToByteArray())
|
||||
val retained = group.retainedSecrets()
|
||||
|
||||
assertEquals(0L, retained.epoch)
|
||||
assertTrue(retained.senderDataSecret.isNotEmpty())
|
||||
assertTrue(retained.encryptionSecret.isNotEmpty())
|
||||
assertEquals(1, retained.leafCount)
|
||||
|
||||
// Serialize and deserialize
|
||||
val writer =
|
||||
com.vitorpamplona.quartz.marmot.mls.codec
|
||||
.TlsWriter()
|
||||
retained.encodeTls(writer)
|
||||
val bytes = writer.toByteArray()
|
||||
|
||||
val restored =
|
||||
RetainedEpochSecrets.decodeTls(
|
||||
com.vitorpamplona.quartz.marmot.mls.codec
|
||||
.TlsReader(bytes),
|
||||
)
|
||||
|
||||
assertEquals(retained.epoch, restored.epoch)
|
||||
assertContentEquals(retained.senderDataSecret, restored.senderDataSecret)
|
||||
assertContentEquals(retained.encryptionSecret, restored.encryptionSecret)
|
||||
assertEquals(retained.leafCount, restored.leafCount)
|
||||
}
|
||||
|
||||
@Test
|
||||
fun testMultipleEpochSaveRestore() {
|
||||
val group = MlsGroup.create("alice".encodeToByteArray())
|
||||
|
||||
// Advance through multiple epochs
|
||||
for (i in 0 until 3) {
|
||||
val bundle = group.createKeyPackage("member$i".encodeToByteArray(), ByteArray(0))
|
||||
group.addMember(bundle.keyPackage.toTlsBytes())
|
||||
}
|
||||
|
||||
assertEquals(3L, group.epoch)
|
||||
assertEquals(4, group.memberCount)
|
||||
|
||||
// Save and restore
|
||||
val state = group.saveState()
|
||||
val restoredGroup = MlsGroup.restore(MlsGroupState.decodeTls(state.encodeTls()))
|
||||
|
||||
assertEquals(3L, restoredGroup.epoch)
|
||||
assertEquals(4, restoredGroup.memberCount)
|
||||
|
||||
// Verify encrypt/decrypt still works
|
||||
val plaintext = "After 3 epochs".encodeToByteArray()
|
||||
val encrypted = restoredGroup.encrypt(plaintext)
|
||||
val decrypted = restoredGroup.decrypt(encrypted)
|
||||
assertContentEquals(plaintext, decrypted.content)
|
||||
}
|
||||
|
||||
@Test
|
||||
fun testStateVersionInSerialization() {
|
||||
val group = MlsGroup.create("alice".encodeToByteArray())
|
||||
val state = group.saveState()
|
||||
val bytes = state.encodeTls()
|
||||
|
||||
// First two bytes should be the version (uint16 = 1)
|
||||
val reader =
|
||||
com.vitorpamplona.quartz.marmot.mls.codec
|
||||
.TlsReader(bytes)
|
||||
val version = reader.readUint16()
|
||||
assertEquals(1, version)
|
||||
}
|
||||
|
||||
@Test
|
||||
fun testSigningKeyRotation() {
|
||||
val group = MlsGroup.create("alice".encodeToByteArray())
|
||||
val exporterBefore = group.exporterSecret("marmot", "test".encodeToByteArray(), 32)
|
||||
|
||||
// Rotate signing key
|
||||
group.proposeSigningKeyRotation()
|
||||
group.commit()
|
||||
|
||||
assertEquals(1L, group.epoch)
|
||||
|
||||
// Exporter secret changes after epoch transition
|
||||
val exporterAfter = group.exporterSecret("marmot", "test".encodeToByteArray(), 32)
|
||||
assertTrue(!exporterBefore.contentEquals(exporterAfter))
|
||||
|
||||
// Can still encrypt/decrypt after rotation
|
||||
val plaintext = "After key rotation".encodeToByteArray()
|
||||
val encrypted = group.encrypt(plaintext)
|
||||
val decrypted = group.decrypt(encrypted)
|
||||
assertContentEquals(plaintext, decrypted.content)
|
||||
}
|
||||
|
||||
@Test
|
||||
fun testSaveRestoreAfterSigningKeyRotation() {
|
||||
val group = MlsGroup.create("alice".encodeToByteArray())
|
||||
group.proposeSigningKeyRotation()
|
||||
group.commit()
|
||||
|
||||
val state = group.saveState()
|
||||
val restoredGroup = MlsGroup.restore(MlsGroupState.decodeTls(state.encodeTls()))
|
||||
|
||||
assertEquals(1L, restoredGroup.epoch)
|
||||
|
||||
val plaintext = "After restore + rotation".encodeToByteArray()
|
||||
val encrypted = restoredGroup.encrypt(plaintext)
|
||||
val decrypted = restoredGroup.decrypt(encrypted)
|
||||
assertContentEquals(plaintext, decrypted.content)
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user