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Old 04-02-2014, 04:13 PM   #1 (permalink)
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Default powershell - encrypt strings with public / private keys

I found some code to do this. However, it requires the cert to be installed inside the certificate stores in windows. Does anyone know of a way to do the same thing with keys that are strings. This should avoid the need to install the cert on every machine.

Aperture Science Blog - Blog - Encrypting a string using certificates andÂ*PowerShell

Code:
Function encrypt-envelope ($unprotectedcontent, $cert)

{

            [System.Reflection.Assembly]::LoadWithPartialName("System.Security") | Out-Null

            $utf8content = [Text.Encoding]::UTF8.GetBytes($unprotectedcontent)

            $content = New-Object Security.Cryptography.Pkcs.ContentInfo `

                    -argumentList (,$utf8content)

            $env = New-Object Security.Cryptography.Pkcs.EnvelopedCms $content

            $recpient = (New-Object System.Security.Cryptography.Pkcs.CmsRecipient($cert))

            $env.Encrypt($recpient)

            $base64string = [Convert]::ToBase64String($env.Encode())

            return $base64string

}


function decrypt-envelope ($base64string)

{

            [System.Reflection.Assembly]::LoadWithPartialName("System.Security") | Out-Null

            $content = [Convert]::FromBase64String($base64string)

 

            $env = New-Object Security.Cryptography.Pkcs.EnvelopedCms

            $env.Decode($content)

            $env.Decrypt()

 

            $utf8content = [text.encoding]::UTF8.getstring($env.ContentInfo.Content)

            return $utf8content

}
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