问SecItemCopyMatching始终返回存储的EC密钥的“似乎不是有效的密钥链项”

EN

func initialize(_ keyTag: String) throws -> DeviceBindingParameters {
    let tag = keyTag.data(using: .utf8)!
    let attributes: [String: Any] =
            [kSecAttrKeyType       as String: kSecAttrKeyTypeECSECPrimeRandom,
             kSecAttrKeySizeInBits as String: 256,
             kSecPrivateKeyAttrs   as String: [
                kSecAttrIsPermanent    as String: true,
                kSecAttrLabel          as String: tag,
                kSecAttrApplicationTag as String: tag
             ]
            ]

    ... other stuff
}

open func doesKeyExist(_ keyTag: String) -> Bool {
    let tag = keyTag.data(using: .utf8)!
    let query: [String: Any] = [
            kSecClass as String : kSecAttrKeyType,
            kSecAttrLabel as String : tag,
            kSecAttrApplicationTag as String: tag,
            kSecAttrKeyType as String: kSecAttrKeyTypeECSECPrimeRandom,
            kSecReturnRef as String: true
    ]
        
    var item: CFTypeRef?
    let status = SecItemCopyMatching(query as CFDictionary, &item)
    let errorDescription = SecCopyErrorMessageString(status,nil)
    print(errorDescription)
    return status == noErr
}

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    do {
        try crypto.initialize("rohan-key")
        let keyStatus = try crypto.doesKeyExist("rohan-key")
            print("Key status: \(keyStatus)")
    } catch {
        print("errors")
    }

Optional(The specified item does not appear to be a valid keychain item.)
Key status: false