iOS 真的能支持 AES 256 吗？
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Can iOS really support AES 256?
提问by Howard
I have read the header of CommonCryptor.h, and only I can find kCCAlgorithmAES128
我已经阅读了 的标题CommonCryptor.h，只有我能找到kCCAlgorithmAES128
But there are a few answer in SO stating it can, e.g.
但是在SO中有一些答案说明它可以，例如
AES Encryption for an NSString on the iPhone
Anyone can answer?
任何人都可以回答吗？
回答by DarkDust
You can always use OpenSSL on iPhone, and that does support AES 256.
您始终可以在 iPhone 上使用 OpenSSL，而且它确实支持 AES 256。
That being said, kCCAlgorithmAES128means a blocklength of 128, not key length. According to this example code(found in this answer) you simply need to use kCCKeySizeAES256for the keyLengthparameter to get support for 256 bit keys.
话虽如此，这kCCAlgorithmAES128意味着块长度为 128，而不是密钥长度。根据此示例代码（在此答案中找到），您只需使用kCCKeySizeAES256该keyLength参数即可获得对 256 位密钥的支持。
回答by dom
Recently I discovered a category of NSData(also NSString) which implements AES en-/decryption. Maybe this is helpful to crypt any kind of data:
最近我发现了一类NSData（也NSString）实现了 AES 加密/解密。也许这有助于加密任何类型的数据：
Adding methods to NSData and NSString using categories to provide AES256 encryption on iOS
使用类别向 NSData 和 NSString 添加方法以在 iOS 上提供 AES256 加密
But it seems to have an implementation issue, which makes it incompatible with openSSL.
但它似乎有一个实现问题，这使得它与 openSSL 不兼容。
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Another useful like might be Properly encrypting with AES with CommonCrypto. To support 256 bit keys just change the kCCKeySizeAES128to 256.
另一个有用的方法可能是使用 CommonCrypto 使用 AES 正确加密。要支持 256 位密钥，只需将 更改kCCKeySizeAES128为 256。
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Last but not least this tread looks promising: Decode OpenSSL AES256 string in iOS
最后但并非最不重要的一点是：在 iOS 中解码 OpenSSL AES256 字符串
回答by Ankit Srivastava
If you goto http://www.opensource.apple.com/source/CommonCrypto/CommonCrypto-36064/CommonCrypto/CommonCryptor.hand search AES256 on the page you will find the key size as 256 ,192,128 so yes it does support AES256 encryption.
如果您转到http://www.opensource.apple.com/source/CommonCrypto/CommonCrypto-36064/CommonCrypto/CommonCryptor.h并在页面上搜索 AES256，您会发现密钥大小为 256 ,192,128 所以它确实支持 AES256加密。
