Hi,

verifing of a file is often done by builting an MD5 or an sha256 hash over it.

Powershell has no “builtin” functions for this purposes.

So I wrote some 🙂

function MD5Sum([string]$sFile)
{
	$oMD5=[System.Security.Cryptography.MD5]::Create()
	$oStream=[System.IO.File]::OpenRead($sFile)
	$sMD5=[System.BitConverter]::ToString($oMD5.ComputeHash($oStream)).Replace("-" ,"").ToLower()
	$oStream.Close()
	return($sMD5)
}

function sha256sum([string]$sFile)
{
	$oSHA256=[System.Security.Cryptography.SHA256]::Create()
	$oStream=[System.IO.File]::OpenRead($sFile)
	$sSHA256=[System.BitConverter]::ToString($oSHA256.ComputeHash($oStream)).Replace("-","").ToLower()
	$oStream.Close()
	return($sSHA256)
}

Usage

PS C:\> sha256sum D:\temp\vshadow.exe
7699187b710263779b97ebe63925d77769f15236f0aa506373dd92772bbcf87b

Michael