如何用SecureEnclave持久化存储加密数据

import UIKit
import Security

func saveEncryptedData(_ data: Data, forKey key: String) -> OSStatus {
    let query: [String: Any] = [
        kSecClass as String: kSecClassGenericPassword,
        kSecAttrAccount as String: key,
        kSecValueData as String: data
    ]
    
    let status = SecItemAdd(query as CFDictionary, nil)
    return status
}

func loadDecryptedData(forKey key: String) -> Data? {
    let query: [String: Any] = [
        kSecClass as String: kSecClassGenericPassword,
        kSecAttrAccount as String: key,
        kSecReturnData as String: kCFBooleanTrue!,
        kSecMatchLimit as String: kSecMatchLimitOne
    ]
    
    var dataTypeRef: AnyObject?
    let status = SecItemCopyMatching(query as CFDictionary, &dataTypeRef)
    
    if status == errSecSuccess {
        return dataTypeRef as? Data
    } else {
        return nil
    }
}

// 示例用法
let originalData = "Hello, SecureEnclave!".data(using: .utf8)!
let key = "mySecureKey"

let saveStatus = saveEncryptedData(originalData, forKey: key)
if saveStatus == errSecSuccess {
    print("数据保存成功")
} else {
    print("数据保存失败，状态码: \(saveStatus)")
}

if let loadedData = loadDecryptedData(forKey: key) {
    let decryptedString = String(data: loadedData, encoding: .utf8)
    print("解密后的数据: \(decryptedString ?? "")")
} else {
    print("数据加载失败")
}