Add public device keys to rageshakes

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/encryption/EncryptionService.kt

@@ -50,4 +50,16 @@ interface EncryptionService {
      * Wait for backup upload steady state.
      */
     fun waitForBackupUploadSteadyState(): Flow<BackupUploadState>
+
+    /**
+     * Get the public curve25519 key of our own device in base64. This is usually what is
+     * called the identity key of the device.
+     */
+    suspend fun deviceCurve25519(): String?
+
+    /**
+     * Get the public ed25519 key of our own device. This is usually what is
+     * called the fingerprint of the device.
+     */
+    suspend fun deviceEd25519(): String?
 }

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/encryption/RustEncryptionService.kt

@@ -190,4 +190,12 @@ internal class RustEncryptionService(
             it.mapRecoveryException()
         }
     }
+
+    override suspend fun deviceCurve25519(): String? {
+        return service.curve25519Key()
+    }
+
+    override suspend fun deviceEd25519(): String? {
+        return service.ed25519Key()
+    }
 }

libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/encryption/FakeEncryptionService.kt

@@ -39,6 +39,9 @@ class FakeEncryptionService : EncryptionService {
 
     private var enableBackupsFailure: Exception? = null
 
+    private var curve25519: String? = null
+    private var ed25519: String? = null
+
     fun givenEnableBackupsFailure(exception: Exception?) {
         enableBackupsFailure = exception
     }
@@ -94,6 +97,15 @@ class FakeEncryptionService : EncryptionService {
         return waitForBackupUploadSteadyStateFlow
     }
 
+    fun givenDeviceKeys(curve25519: String?, ed25519: String?) {
+        this.curve25519 = curve25519
+        this.ed25519 = ed25519
+    }
+
+    override suspend fun deviceCurve25519(): String? = curve25519
+
+    override suspend fun deviceEd25519(): String? = ed25519
+
     suspend fun emitBackupState(state: BackupState) {
         backupStateStateFlow.emit(state)
     }