Database, Software, and System Engineering

Asymmetric Encryption of Text using x.509 Certificates in PowerShell

I’ve been requested to encryption sections of my script (user name/password) using a certificate issued by a trusted CA.  No problem.

First, I created a self-signed x.509 certificate and a CN of “PowerShellCert”.  Here’s the command used with the makecert utility to create a 2048 length cert:

C:\Program Files\Microsoft SDKs\Windows\v7.1>makecert.exe -r -pe -n "CN=PowerShellCert" -ss my -sr localmachine -eku -len 2048 -e 01/01/2030 C:\Scripts\PowerShell\Asymmetrical-Encryption\PowerShellAsymmetrical.cer

Here’s the encryption function:

Function Encrypt-Asymmetric {
		[Parameter(Position=0, Mandatory=$true)][ValidateNotNullOrEmpty()][System.String]
		[Parameter(Position=1, Mandatory=$true)][ValidateNotNullOrEmpty()][ValidateScript({Test-Path $_ -PathType Leaf})][System.String]
    # Encrypts a string with a public key
    $PublicCert = New-Object System.Security.Cryptography.X509Certificates.X509Certificate2($PublicCertFilePath)
    $ByteArray = [System.Text.Encoding]::UTF8.GetBytes($ClearText)
	$EncryptedByteArray = $PublicCert.PublicKey.Key.Encrypt($ByteArray,$true)
	$Base64String = [Convert]::ToBase64String($EncryptedByteArray)

	Return $Base64String 

…here’s the decryption function:

Function Decrypt-Asymmetric
		[Parameter(Position=0, Mandatory=$true)][ValidateNotNullOrEmpty()][System.String]
		[Parameter(Position=1, Mandatory=$true)][ValidateNotNullOrEmpty()][System.String]
    # Decrypts cipher text using the private key
    # Assumes the certificate is in the LocalMachine\My (Personal) Store
    $Cert = Get-ChildItem cert:\LocalMachine\My | where { $_.Thumbprint -eq $CertThumbprint }
	if($Cert) {
	    $EncryptedByteArray = [Convert]::FromBase64String($EncryptedBase64String)
	    $ClearText = [System.Text.Encoding]::UTF8.GetString($Cert.PrivateKey.Decrypt($EncryptedByteArray,$true))
	Else {Write-Error "Certificate with thumbprint: $CertThumbprint not found!"}

	Return $ClearText

To Encrypt clear text:

PS C:\>Encrypt-Asymmetric -ClearText "CLEAR TEXT DATA" -PublicCertFilePath "C:\Scripts\PowerShell\Asymmetrical-Encryption\PowerShellAsymmetricalTest.cer"

To Decrypt clear text:

PS C:\>Decrypt-Asymmetric -EncryptedBase64String $Base64String -CertThumbprint "83D2D68907681EF3D823B23DEE24B0CBB3FA3C51"

To find your Certificate’s thumbprint (assuming you gave it the same name as I did above):

PS C:\> Get-ChildItem cert:\LocalMachine\My | where { $_.Subject -eq "CN=PowerShellCert" } | select Thumbprint

Now, encryption keys can be garded under the Windows key store.

Share on Tumblr

, ,

Leave a Reply

Connect with:

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>

Current day month ye@r *