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I have read the header of CommonCryptor.h, and only I can find kCCAlgorithmAES128
But there are a few answer in SO stating it can, e.g.
AES Encryption for an NSString on the iPhone
Anyone can answer?
You can always use OpenSSL on iPhone, and that does support AES 256.
That being said,
kCCAlgorithmAES128means a block length of 128, not key length. According to this example code (found in this answer) you simply need to usekCCKeySizeAES256for thekeyLengthparameter to get support for 256 bit keys.