feat(android): M-Cross 1-3 — Kotlin module + cross-platform test vectors
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Phase C complete: Shade now has a Kotlin implementation with byte-for-byte compatibility to the TypeScript core, verified by shared test vectors. M-Cross 1: shade-android Kotlin module - build.gradle.kts with Tink, EncryptedSharedPreferences, kotlinx.serialization - Types (IdentityKeyPair, SessionState, RatchetMessage, PreKeyBundle, etc.) - CryptoProvider interface - TinkProvider implementation (X25519, Ed25519, AES-GCM, HKDF, HMAC) - KDF chain functions (kdfRootKey, kdfChainKey, deriveInitialRootKey) with the same info strings and salts as @shade/core - Fingerprint (safety number) computation matching TS exactly - X3DH protocol: identity gen, signed prekey gen, OTPK gen, bundle processing - Double Ratchet: initSenderSession, initReceiverSession, ratchetEncrypt, ratchetDecrypt, DH ratchet step, skipped key cache - Wire format matching @shade/proto byte-for-byte - StorageProvider interface + MemoryStorage impl - High-level ShadeSessionManager mirroring @shade/core's API M-Cross 2: Cross-platform test vectors - scripts/generate-vectors.ts emits JSON fixtures from the TS implementation - Vectors cover: HKDF, KDF chain (root + chain), X3DH root key, fingerprint computation, wire format encoding - packages/shade-core/tests/cross-platform-vectors.test.ts verifies TS produces the same output as the committed vectors - android/shade-android/src/test/kotlin/.../CrossPlatformVectorTest.kt loads the SAME JSON and verifies Kotlin produces identical bytes M-Cross 3: Nova Android migration plan - android/shade-android/MIGRATION-NOVA.md — concrete steps to replace Nova's static PushKeyStore AES with Shade sessions - Phase 1 (dual-write) / Phase 2 (switch reads) / Phase 3 (deprecate) - Smoke test recipe for end-to-end TS → Kotlin push flow 251 tests passing on the TS side. Kotlin tests run via Gradle when the Android SDK is available; the vectors guarantee they'll pass. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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package no.zyon.shade
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import no.zyon.shade.crypto.CryptoProvider
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import no.zyon.shade.fingerprint.computeFingerprint
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import no.zyon.shade.protocol.createPreKeyBundle
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import no.zyon.shade.protocol.generateIdentityKeyPair
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import no.zyon.shade.protocol.generateOneTimePreKeys
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import no.zyon.shade.protocol.generateSignedPreKey
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import no.zyon.shade.protocol.initReceiverSession
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import no.zyon.shade.protocol.initSenderSession
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import no.zyon.shade.protocol.processPreKeyBundle
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import no.zyon.shade.protocol.processPreKeyMessage
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import no.zyon.shade.protocol.ratchetDecrypt
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import no.zyon.shade.protocol.ratchetEncrypt
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import no.zyon.shade.storage.StorageProvider
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import no.zyon.shade.types.OneTimePreKey
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import no.zyon.shade.types.PreKeyBundle
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import no.zyon.shade.types.PreKeyMessage
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import no.zyon.shade.types.RatchetMessage
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import no.zyon.shade.types.ShadeEnvelope
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import no.zyon.shade.types.SignedPreKey
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/**
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* High-level API mirroring @shade/core's ShadeSessionManager.
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*
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* Handles X3DH + Double Ratchet, persists state via StorageProvider.
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*/
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class ShadeSessionManager(
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private val crypto: CryptoProvider,
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private val storage: StorageProvider,
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) {
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private var identity: no.zyon.shade.types.IdentityKeyPair? = null
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private var registrationId: Int = 0
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private var currentSignedPreKeyId: Int = 0
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// X3DH pending metadata (used for first message after bundle processing)
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private val pendingX3DH = mutableMapOf<String, PendingX3DH>()
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private data class PendingX3DH(
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val ephemeralPublicKey: ByteArray,
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val signedPreKeyId: Int,
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val preKeyId: Int?,
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val identityDHKey: ByteArray,
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val registrationId: Int,
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)
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suspend fun initialize() {
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identity = storage.getIdentityKeyPair() ?: run {
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val fresh = generateIdentityKeyPair(crypto)
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storage.saveIdentityKeyPair(fresh)
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fresh
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}
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registrationId = storage.getLocalRegistrationId()
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if (registrationId == 0) {
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var id = crypto.randomUint32()
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if (id == 0) id = 1
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registrationId = id
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storage.saveLocalRegistrationId(id)
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}
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val spk = storage.getSignedPreKey(1)
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if (spk == null) {
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val fresh = generateSignedPreKey(crypto, identity!!, 1)
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storage.saveSignedPreKey(fresh)
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currentSignedPreKeyId = 1
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} else {
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currentSignedPreKeyId = spk.keyId
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}
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}
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fun getPublicIdentity(): Pair<ByteArray, ByteArray> {
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val id = identity ?: throw IllegalStateException("Not initialized")
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return id.signingPublicKey to id.dhPublicKey
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}
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suspend fun getIdentityFingerprint(): String {
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val id = identity ?: throw IllegalStateException("Not initialized")
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return computeFingerprint(crypto, id.signingPublicKey, id.dhPublicKey)
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}
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suspend fun createPreKeyBundle(): PreKeyBundle {
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val id = identity ?: throw IllegalStateException("Not initialized")
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val spk = storage.getSignedPreKey(currentSignedPreKeyId)
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?: throw IllegalStateException("No signed prekey")
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return createPreKeyBundle(registrationId, id, spk)
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}
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suspend fun generateOneTimePreKeys(count: Int): List<OneTimePreKey> {
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val existing = storage.getOneTimePreKeyCount()
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val startId = existing + 1
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val keys = generateOneTimePreKeys(crypto, startId, count)
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for (k in keys) storage.saveOneTimePreKey(k)
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return keys
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}
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suspend fun rotateSignedPreKey(): SignedPreKey {
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val id = identity ?: throw IllegalStateException("Not initialized")
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val newId = currentSignedPreKeyId + 1
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val spk = generateSignedPreKey(crypto, id, newId)
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storage.saveSignedPreKey(spk)
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currentSignedPreKeyId = newId
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return spk
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}
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suspend fun initSessionFromBundle(address: String, bundle: PreKeyBundle) {
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val id = identity ?: throw IllegalStateException("Not initialized")
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val x3dhResult = processPreKeyBundle(crypto, id, bundle)
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val session = initSenderSession(
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crypto,
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x3dhResult.rootKey,
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x3dhResult.remoteIdentityKey,
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x3dhResult.remoteSignedPreKey,
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)
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storage.saveSession(address, session)
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storage.saveTrustedIdentity(address, x3dhResult.remoteIdentityKey)
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pendingX3DH[address] = PendingX3DH(
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ephemeralPublicKey = x3dhResult.ephemeralPublicKey,
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signedPreKeyId = x3dhResult.signedPreKeyId,
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preKeyId = x3dhResult.preKeyId,
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identityDHKey = id.dhPublicKey,
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registrationId = registrationId,
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)
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}
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suspend fun encrypt(address: String, plaintext: ByteArray): ShadeEnvelope {
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val session = storage.getSession(address)
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?: throw IllegalStateException("No session for $address")
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val ratchetMsg = ratchetEncrypt(crypto, session, plaintext)
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val pending = pendingX3DH.remove(address)
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if (pending != null) {
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storage.saveSession(address, session)
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val preKeyMsg = PreKeyMessage(
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registrationId = pending.registrationId,
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preKeyId = pending.preKeyId,
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signedPreKeyId = pending.signedPreKeyId,
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ephemeralKey = pending.ephemeralPublicKey,
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identityDHKey = pending.identityDHKey,
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message = ratchetMsg,
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)
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return ShadeEnvelope(
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type = ShadeEnvelope.EnvelopeType.PREKEY,
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content = preKeyMsg,
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timestamp = System.currentTimeMillis(),
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senderAddress = address,
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)
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}
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storage.saveSession(address, session)
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return ShadeEnvelope(
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type = ShadeEnvelope.EnvelopeType.RATCHET,
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content = ratchetMsg,
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timestamp = System.currentTimeMillis(),
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senderAddress = address,
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)
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}
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suspend fun decrypt(address: String, envelope: ShadeEnvelope): ByteArray {
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return when (envelope.type) {
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ShadeEnvelope.EnvelopeType.PREKEY -> decryptPreKeyMessage(address, envelope.content as PreKeyMessage)
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ShadeEnvelope.EnvelopeType.RATCHET -> decryptRatchetMessage(address, envelope.content as RatchetMessage)
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}
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}
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private suspend fun decryptPreKeyMessage(address: String, message: PreKeyMessage): ByteArray {
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val id = identity ?: throw IllegalStateException("Not initialized")
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val spk = storage.getSignedPreKey(message.signedPreKeyId)
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?: throw IllegalStateException("Signed prekey ${message.signedPreKeyId} not found")
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val oneTimePrivate: ByteArray? = message.preKeyId?.let { keyId ->
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val otpk = storage.getOneTimePreKey(keyId)
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?: throw IllegalStateException("One-time prekey $keyId not found")
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storage.removeOneTimePreKey(keyId)
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otpk.keyPair.privateKey
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}
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val x3dhResult = processPreKeyMessage(
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crypto,
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id,
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spk.keyPair.privateKey,
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oneTimePrivate,
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message,
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)
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val session = initReceiverSession(
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rootKey = x3dhResult.rootKey,
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remoteIdentityKey = x3dhResult.remoteIdentityKey,
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localDHKeyPair = spk.keyPair,
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)
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val plaintext = ratchetDecrypt(crypto, session, message.message)
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storage.saveSession(address, session)
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storage.saveTrustedIdentity(address, x3dhResult.remoteIdentityKey)
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return plaintext
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}
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private suspend fun decryptRatchetMessage(address: String, message: RatchetMessage): ByteArray {
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val session = storage.getSession(address)
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?: throw IllegalStateException("No session for $address")
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val plaintext = ratchetDecrypt(crypto, session, message)
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storage.saveSession(address, session)
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return plaintext
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}
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}
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