CryptoSwift vs SAMKeychain

不知道什么本质区别？反正都可以用户保持keychain数据。

关于SAMKeychain

1. return SAMKeychain.password(forService: Keys.service, account: Keys.account)
2. SAMKeychain.deletePassword(forService: Keys.service, account: Keys.account)

关于CryptoSwift
Swift - 第三方加密库CryptoSwift使用详解1（数据类型转换、MD5、SHA）
https://www.hangge.com/blog/cache/detail_1865.html

Swift - 第三方加密库CryptoSwift使用详解2（CRC、MAC、PBKDF2）
https://www.hangge.com/blog/cache/detail_1867.html

例子：

1. keychain.set(timeString, forKey: autoLockTime)
    keychain.set(String(type.rawValue), forKey: autoLockType)

2. let timeString = keychain.get(autoLockTime)

3. keychain.delete(passcodeAttempts)

4. func save(cookies: [HTTPCookie]) {
        let data = NSKeyedArchiver.archivedData(withRootObject: cookies)
        keychain.set(data, forKey: cookiesKey)
    }
let encodedData = keychain.getData(cookiesKey)