Calculate SHA256 using CUDA (.exe file)

I am looking for someone who can effectively write a super simple C++ program that uses CUDA / GPU for speed, to run the following equivalent of this PHP script (i need millions or billions of calculations per second). It is an infinite loop looking for a correct hash in a sequence of hashes: // START $hash = "D8A928B2043DB77E340B523547BF16CB4AA483F0645FE0A290ED1F20AAB76257"; while (1){ $previousHash = $hash; $hash = hash('sha256', $hash); if($hash == "C0F405C251327D261E23897F813907DA82FA4ECAAA76E8E65B257671A823A05F") { echo $i . " - Found the right starting hash! Our starting hash is " . $previousHash . "\n"; exit(); } } // END I need the source code and compiled windows EXE file. Perhaps some small adjustments like logging and input parameters (starting hash).