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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>
60 lines
2.0 KiB
Markdown
60 lines
2.0 KiB
Markdown
# shade-android
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Kotlin implementation of the Shade E2EE protocol for Android apps. Byte-for-byte compatible with `@shade/core` (TypeScript), so messages encrypted on a TS backend can be decrypted on Android and vice versa.
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## Status
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**Milestone M-Cross 1 — initial scaffold.** The protocol implementation is being ported. Cross-platform test vectors in `test-vectors/` verify that Kotlin and TypeScript produce identical output for every step (identity gen → HKDF → X3DH → ratchet → fingerprint → wire format).
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## Usage (target API)
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```kotlin
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import no.zyon.shade.ShadeSessionManager
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import no.zyon.shade.crypto.TinkProvider
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import no.zyon.shade.storage.KeystoreStorage
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val crypto = TinkProvider()
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val storage = KeystoreStorage(context)
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val manager = ShadeSessionManager(crypto, storage)
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manager.initialize()
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// Establish a session with a peer
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val bundle = fetchBundleFromServer("bob@example.com")
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manager.initSessionFromBundle("bob@example.com", bundle)
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// Encrypt
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val envelope = manager.encrypt("bob@example.com", "hello")
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// Decrypt
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val plaintext = manager.decrypt("alice@example.com", incomingEnvelope)
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```
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## Crypto primitives
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Backed by Google Tink:
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- X25519 for Diffie-Hellman (via `X25519.generatePrivateKey()` / `computeSharedSecret`)
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- Ed25519 for signing (via `Ed25519Sign` / `Ed25519Verify`)
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- AES-256-GCM (via `AesGcmJce`)
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- HKDF-SHA256 (via `Hkdf.computeHkdf`)
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- HMAC-SHA256 (via `MacFactory`)
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## Building
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Requires Android SDK 35 and JDK 17.
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```bash
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./gradlew :shade-android:assembleDebug
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./gradlew :shade-android:test
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```
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## Compatibility
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The Kotlin implementation must produce byte-identical output to `@shade/core` for:
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- KDF chain derivations (root key ratchet, chain key ratchet)
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- X3DH shared secrets
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- Ratchet message keys and ciphertext (given the same keys)
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- Fingerprints (safety numbers)
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- Binary wire format (`@shade/proto`)
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Shared test vectors in `test-vectors/` are loaded by both the TS and Kotlin test suites. Any divergence fails the CI immediately.
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