Secure enclave implementation

SecretKit/SmartCard/SmartCard.swift

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+public enum SmartCard {}

SecretKit/SmartCard/SmartCardSecret.swift

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+import Foundation
+import Combine
+
+extension SmartCard {
+
+    public struct Secret: SecretKit.Secret {
+
+        public let id: Data
+        public let name: String
+        public let publicKey: Data
+
+    }
+
+}

SecretKit/SmartCard/SmartCardStore.swift

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+import Foundation
+import Security
+import CryptoTokenKit
+
+extension SmartCard {
+
+    public class Store: SecretStore {
+
+        // TODO: Read actual smart card name, eg "YubiKey 5c"
+        public let name = NSLocalizedString("Smart Card", comment: "Smart Card")
+        @Published public fileprivate(set) var secrets: [Secret] = []
+        fileprivate let watcher = TKTokenWatcher()
+
+        public init() {
+            watcher.setInsertionHandler { (string) in
+                print(string)
+            }
+            print(watcher.tokenIDs)
+        }
+
+        public func sign(data: Data, with secret: SmartCard.Secret) throws -> Data {
+            fatalError()
+        }
+
+        public func delete(secret: SmartCard.Secret) throws {
+        }
+
+    }
+}