Sha256 in Objective-C for iPhone

Question

Hi, when i use this code to create a sha256 of a string

unsigned char hashedChars[32];
NSString *inputString;
inputString = [NSString stringWithFormat:@"hello"];
NSData * inputData = [inputString dataUsingEncoding:NSUTF8StringEncoding];
CC_SHA256(inputData.bytes, inputData.length, hashedChars);

it returns the hash correctly, but i need to insert a string like this "\x00\x25\x53" and in this case, the function returns a sha256 of empty string because the specified encoding cannot be used to convert the receiver.

Now, my question is:How to insert this special characters for generate a correct hash? Thanks

Answer 1

You probably should use NSData instead of NSString then. Where do you get that string from?