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Is it intended to not have any null-termination on the data array to make the challenge harder? strlen() reads data until it finds the first null character, which with this implementation is somewhere past the end of the data array. When I'm running this on an x86_64 emulator strlen returns 38 while the data array is 32 characters long. This also means that the last characters of the out array will be based on data read from past the end of the data and key arrays.