Fix incorrect multi device signature signing and verification.

SignalServiceKit/src/Loki/API/Multi Device/DeviceLinkingUtilities.swift

@@ -7,7 +7,7 @@ public enum DeviceLinkingUtilities {
     public static func getLinkingRequestMessage(for masterHexEncodedPublicKey: String) -> DeviceLinkMessage {
         let slaveKeyPair = OWSIdentityManager.shared().identityKeyPair()!
         let slaveHexEncodedPublicKey = slaveKeyPair.hexEncodedPublicKey
-        var kind = LKDeviceLinkMessageKind.request
+        var kind = UInt8(LKDeviceLinkMessageKind.request.rawValue)
         let data = Data(hex: masterHexEncodedPublicKey) + Data(bytes: &kind, count: MemoryLayout.size(ofValue: kind))
         let slaveSignature = try! Ed25519.sign(data, with: slaveKeyPair)
         let thread = TSContactThread.getOrCreateThread(contactId: masterHexEncodedPublicKey)
@@ -18,7 +18,7 @@ public enum DeviceLinkingUtilities {
         let masterKeyPair = OWSIdentityManager.shared().identityKeyPair()!
         let masterHexEncodedPublicKey = masterKeyPair.hexEncodedPublicKey
         let slaveHexEncodedPublicKey = deviceLink.slave.hexEncodedPublicKey
-        var kind = LKDeviceLinkMessageKind.authorization
+        var kind = UInt8(LKDeviceLinkMessageKind.authorization.rawValue)
         let data = Data(hex: slaveHexEncodedPublicKey) + Data(bytes: &kind, count: MemoryLayout.size(ofValue: kind))
         let masterSignature = try! Ed25519.sign(data, with: masterKeyPair)
         let slaveSignature = deviceLink.slave.signature!
@@ -29,7 +29,7 @@ public enum DeviceLinkingUtilities {
     public static func hasValidSlaveSignature(_ deviceLink: DeviceLink) -> Bool {
         guard let slaveSignature = deviceLink.slave.signature else { return false }
         let slavePublicKey = Data(hex: deviceLink.slave.hexEncodedPublicKey.removing05PrefixIfNeeded())
-        var kind = LKDeviceLinkMessageKind.request
+        var kind = UInt8(LKDeviceLinkMessageKind.request.rawValue)
         let data = Data(hex: deviceLink.master.hexEncodedPublicKey) + Data(bytes: &kind, count: MemoryLayout.size(ofValue: kind))
         return (try? Ed25519.verifySignature(slaveSignature, publicKey: slavePublicKey, data: data)) ?? false
     }
@@ -37,7 +37,7 @@ public enum DeviceLinkingUtilities {
     public static func hasValidMasterSignature(_ deviceLink: DeviceLink) -> Bool {
         guard let masterSignature = deviceLink.master.signature else { return false }
         let masterPublicKey = Data(hex: deviceLink.master.hexEncodedPublicKey.removing05PrefixIfNeeded())
-        var kind = LKDeviceLinkMessageKind.authorization
+        var kind = UInt8(LKDeviceLinkMessageKind.authorization.rawValue)
         let data = Data(hex: deviceLink.slave.hexEncodedPublicKey) + Data(bytes: &kind, count: MemoryLayout.size(ofValue: kind))
         return (try? Ed25519.verifySignature(masterSignature, publicKey: masterPublicKey, data: data)) ?? false
     }