Write a windows command line program to generate a SHA256 hash of a string

I need a command line program, with NO user interface, only command line usage, to generate a SHA256 hash of a string.

C:\> makehash.exe inputfile.txt outputfile.txt

The program reads the input file up to the last character (excluding the end of file character) and hashes whatever is in the file.

The program then generates the 64 character hash to the output file as one line.

The program will need to run on a Windows 7 machine.

This is a VERY SIMPLE project that should take you about 1 hour with testing so please don't bid a crazy amount.