Removed unused imports and guarded CryptoKit import.

Author: Thomas Kalhøj Clemensen

Sources/TIMEncryptedStorage/Cryptors/AES/GCM.swift

@@ -1,7 +1,10 @@
 import Foundation
+#if canImport(CryptoKit)
 import CryptoKit
+#endif
 
 extension TIMESCryptor.AES {
+    #if canImport(CryptoKit)
     @available(iOS 13, *)
     struct GCM  {
         @available(iOS 13, *)
@@ -27,4 +30,20 @@ extension TIMESCryptor.AES {
             }
         }
     }
+    #else
+    // Dummy implementation. iOS 13 should always be able to import CryptoKit, but the archiving fails for Xcode 13+.
+    // This way we can make the implementations available on compile time, to avoid build errors.
+    @available(iOS 13, *)
+    struct GCM  {
+        @available(iOS 13, *)
+        static func encrypt(key: Data, data: Data) throws -> Data {
+            fatalError("Failed to import CryptoKit!")
+        }
+
+        @available(iOS 13, *)
+        static func decrypt(key: Data, data: Data) throws -> Data {
+            fatalError("Failed to import CryptoKit!")
+        }
+    }
+    #endif
 }

Sources/TIMEncryptedStorage/Extensions/TIMKeyModel+Extensions.swift

@@ -1,6 +1,4 @@
 import Foundation
-import CommonCrypto
-import CryptoKit
 
 extension TIMKeyModel {