iphone - Encrypting different types of files using C or Objective-C -

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i have chosen algorithm encrypt file. may encrypt text or image files. how can write generic type of encryption method works both text , image files? i'm working objective-c.

what ever encrypting might using data or nsdata, converting char array , applying algorithm. make method takes nsdata argument, , return encrypted nsdata.

e.g. 

-(nsdata*)encrypt:(nsdata*)data{   ///your algorithm    return encrypteddata; }

convert image or file nsdata , pass method.


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