How to Create a TCP Client connection with a Client Certificate in Powershell - ssl

Question

With Following code i can establish a SSL Connection:
$cert = dir cert:\CurrentUser\My | where {$_.Subject -like "*Alice*"}
$computerName = "google.com"
$port = "443"
$socket = New-Object Net.Sockets.TcpClient($computerName, $port)
$stream = $socket.GetStream()
$sslStream = New-Object System.Net.Security.SslStream $stream,$false
$sslStream.AuthenticateAsClient($computerName)
$sslStream
This Works fine. But now i wan't to add a Client Certificate for Authentication.
Think i just need to substitute
$sslStream.AuthenticateAsClient($computerName)
with
$sslStream.BeginAuthenticateAsClient($computerName,$cert,"SslProtocols",$false,"Foo" ,"Bar")
But i wasn't lucky to get the Arguments right. Can Sombody solve the Assync Calls please ;-)
Maybe i need some C# code for this?!?
Arguments are:
System.IAsyncResult BeginAuthenticateAsClient(
string targetHost,
System.Security.Cryptography.X509Certificates.X509CertificateCollection clientCertificates,
System.Security.Authentication.SslProtocols enabledSslProtocols,
bool checkCertificateRevocation,
System.AsyncCallback asyncCallback,
System.Object asyncState)
What i finally want to achieve is to list and later specify the CipherSuites the client is connected to. (I could use Wireshark i know ;-) )

Answer 1

Finally got it working, wasnt argument 4 but the $Cert which was no collection.
$cert = dir cert:\CurrentUser\My | where {$_.Subject -like "*alice*"}
$computerName = "google.com"
$port = "443"
[System.Security.Authentication.SslProtocols]$protocol = "ssl3"
$certcol = New-object System.Security.Cryptography.X509Certificates.X509CertificateCollection
$certcol.Add($cert)
$socket = New-Object Net.Sockets.TcpClient($computerName, $port)
$stream = $socket.GetStream()
$sslStream = New-Object System.Net.Security.SslStream $stream,$false
#$sslStream.AuthenticateAsClient($computerName)
$sslStream.AuthenticateAsClient($computerName,$certcol,$protocol,$false)
$sslStream

Answer 2

According to the documentation, the difference between AuthenticateAsClient and BeginAuthenticateAsClient is that the latter is for asynchronous use.
You should try AuthenticateAsClient(String, X509CertificateCollection, SslProtocols, Boolean), where the second argument is a collection of client certificates that can be used (preferably X509Certificate2, since you'll need the private key associated with the certificate for it to be usable for authentication).