Simple PowerShell MD-5 Script

I’m going to start posting a few useful powershell scripts. I’m not sure where I picked up this snippet but it’s pretty useful. I modified it to resolve-path the param so that you can pass in relative paths.
 
function Get-MD5([System.IO.FileInfo] $file = $(throw 'Usage: Get-MD5 [System.IO.FileInfo]'))

  {

    $file = [System.IO.FileInfo] (Resolve-Path $file).Path

    $stream = $null;

    $cryptoServiceProvider = [System.Security.Cryptography.MD5CryptoServiceProvider];

    $hashAlgorithm = new-object $cryptoServiceProvider

    $stream = $file.OpenRead();

    $hashByteArray = $hashAlgorithm.ComputeHash($stream);

    $stream.Close();

    ## We have to be sure that we close the file stream if any exceptions are thrown.

    trap

    {

      if ($stream -ne $null)

      {

        $stream.Close();

      }

      break;

    }

    return [System.Convert]::ToBase64String($hashByteArray);

  }
  

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