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PowerShell : Getting the hash value for a string

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A simple yet often useful scripting task is getting the hash value for a string. Since I recently wrote this very short function for my colleague Laurent Banon (blog) allow me to share it with you.

function Hash($textToHash)

{

    $hasher = new-object System.Security.Cryptography.SHA256Managed

    $toHash = [System.Text.Encoding]::UTF8.GetBytes($textToHash)

    $hashByteArray = $hasher.ComputeHash($toHash)

    foreach($byte in $hashByteArray)

    {

         $res += $byte.ToString()

    }

    return $res;

}

And its usage :

PS #> . Hash.ps1

PS #> Hash("hi")

Instead of SHA256, you can use other hashing algorithms like the ones available by default in .NET 3.5 ou 4 :

Happy scripting!

Comments

  • Anonymous
    April 25, 2011
    The comment has been removed

  • Anonymous
    April 27, 2011
    This is not possible unless the algorithm you use is a perfect hashing function (i.e. no collision), which is a very particular case scenario. You will generally want to use hashes for passwords or for indexing. en.wikipedia.org/.../Hash_function

  • Anonymous
    November 18, 2013
    The comment has been removed

  • Anonymous
    September 25, 2014
    Loop it seem to be like this    $res = ""    foreach($byte in $hash)    {        $res += [System.String]::Format("{0:X2}", $byte)    }    $res

  • Anonymous
    April 22, 2015
    The comment has been removed

  • Anonymous
    September 24, 2015
    would "Simply".GetHashCode() be ok