Duan/e2ee upgrade (#250)

* * Upgrade WebRTC-SDK to M114.5735.07

* expose failureTolerance for KeyProviderOptions.

* set defaultFailureTolerance to -1.

* upgrade WebRTC-SDK to 114.5735.08.

Author: cloudwebrtc

LiveKitClient.podspec

@@ -16,7 +16,7 @@ Pod::Spec.new do |spec|
 
   spec.source_files   = 'Sources/**/*'
 
-  spec.dependency 'WebRTC-SDK', '~> 114.5735.07'
+  spec.dependency 'WebRTC-SDK', '~> 114.5735.08'
   spec.dependency 'SwiftProtobuf'
   spec.dependency 'PromisesSwift'
   spec.dependency 'Logging'

Package.swift

@@ -17,7 +17,7 @@ let package = Package(
         )
     ],
     dependencies: [
-        .package(name: "WebRTC", url: "https://github.com/webrtc-sdk/Specs.git", .exact("114.5735.07")),
+        .package(name: "WebRTC", url: "https://github.com/webrtc-sdk/Specs.git", .exact("114.5735.08")),
         .package(name: "SwiftProtobuf", url: "https://github.com/apple/swift-protobuf.git", .upToNextMajor(from: "1.21.0")),
         .package(name: "Promises", url: "https://github.com/google/promises.git", .upToNextMajor(from: "2.2.0")),
         .package(url: "https://github.com/apple/swift-log.git", .upToNextMajor(from: "1.5.2"))

Sources/LiveKit/E2EE/KeyProvider.swift

@@ -19,23 +19,27 @@ import WebRTC
 
 public let defaultRatchetSalt: String = "LKFrameEncryptionKey"
 public let defaultMagicBytes: String = "LK-ROCKS"
-public let defaultRatchetWindowSize: Int32 = 16
+public let defaultRatchetWindowSize: Int32 = 0
+public let defaultFailureTolerance: Int32 = -1
 
 public class KeyProviderOptions {
     let sharedKey: Bool
     let ratchetSalt: Data
     let ratchetWindowSize: Int32
     let uncryptedMagicBytes: Data
+    let failureTolerance: Int32
 
     public init(sharedKey: Bool = true,
                 ratchetSalt: Data = defaultRatchetSalt.data(using: .utf8)!,
                 ratchetWindowSize: Int32 = defaultRatchetWindowSize,
-                uncryptedMagicBytes: Data = defaultMagicBytes.data(using: .utf8)!
+                uncryptedMagicBytes: Data = defaultMagicBytes.data(using: .utf8)!,
+                failureTolerance: Int32 = defaultFailureTolerance
     ) {
         self.sharedKey = sharedKey
         self.ratchetSalt = ratchetSalt
         self.ratchetWindowSize = ratchetWindowSize
         self.uncryptedMagicBytes = uncryptedMagicBytes
+        self.failureTolerance = defaultFailureTolerance
     }
 }
 
@@ -47,7 +51,8 @@ public class BaseKeyProvider: Loggable {
         self.rtcKeyProvider = RTCFrameCryptorKeyProvider(ratchetSalt: options.ratchetSalt,
                                                          ratchetWindowSize: options.ratchetWindowSize,
                                                          sharedKeyMode: isSharedKey,
-                                                         uncryptedMagicBytes: options.uncryptedMagicBytes)
+                                                         uncryptedMagicBytes: options.uncryptedMagicBytes,
+                                                         failureTolerance: options.failureTolerance)
         if isSharedKey && sharedKey != nil {
             let keyData = sharedKey!.data(using: .utf8)!
             self.rtcKeyProvider?.setSharedKey(keyData, with: 0)