get-filehashvalidating

# code from http://aperturescience.su
Function Get-FileHash
{

[CMDLetBinding()]
param
(
  [Parameter(mandatory=$true, valuefrompipeline=$true)] [ValidateScript({Test-Path $_ -PathType 'lea'})] [String] $File,
  [ValidateSet("sha1", "sha256", "sha384", "sha512", "md5", "ripemd160")] $HashAlgorithm = "sha256",
  [switch] $Group
)

Process
{
        #variable to store hash of the file
        $hash

# code from http://aperturescience.su