CODEWITHSUNDEEP
powershell
R Saudlach
R Saudlach

Reputation: 388

Powershell MD5 Hex to String

I'm using a very simple Powershell function to compute an MD5 hash

$someString = "Hello World!"
$md5 = new-object -TypeNameSystem.Security.Cryptography.MD5CryptoServiceProvider
$utf8 = new-object -TypeName System.Text.UTF8Encoding
$bithash = [System.BitConverter]::ToString($md5.ComputeHash(($utf8.GetBytes($someString))))
$hash = [convert]::tostring($bitHash,16)
Write-Host $hash

According to the MSDN page, System.BitConverter to return a hexadecimal representation which I then try to convert into a string

The code above returns an error that the input for toString is not the correct format.

What am I missing here?

I am looking to make an MD5 function in powershell that matches output of http://md5.gromweb.com/

Upvotes: 2

Views: 4775

Answers (1)

briantist
briantist

Reputation: 47872

If you're using PowerShell 4, here's an alternative way:

$stream = New-Object System.IO.MemoryStream -ArgumentList @(,$utf8.GetBytes($someString))
$hash = Get-FileHash -Algorithm MD5 -InputStream $stream | Select-Object -ExpandProperty Hash

In PowerShell 5+:

$stream = [System.IO.MemoryStream]::new($utf8.GetBytes($someString))
$hash = Get-FileHash -Algorithm MD5 -InputStream $stream | Select-Object -ExpandProperty Hash

Upvotes: 2

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