Sample code for 30+ languages & platforms
AutoIt

Set a TLS Client Certificate from a PEM

See more Socket/SSL/TLS Examples

Demonstrates Socket.SetSslClientCertPem, which loads and configures a TLS client certificate and private key from PEM data or a PEM file.

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

Background. Supply the PEM password when the private key is encrypted, and configure the client certificate before connecting. Use client certificates only for mutual TLS.

Chilkat AutoIt Downloads

AutoIt
Local $bSuccess = False

$oSocket = ObjCreate("Chilkat.Socket")

;  The file path is relative to the application's current working directory.  An absolute path
;  may also be used.  Supply the path appropriate to your own environment.
;  The PEM password should come from a secure source rather than being hard-coded.
Local $sPemPassword = "myPemPassword"

;  Load and configure the TLS client certificate and private key from a PEM file.  Configure the
;  client certificate before connecting.
$bSuccess = $oSocket.SetSslClientCertPem("qa_data/client.pem",$sPemPassword)
If ($bSuccess = False) Then
    ConsoleWrite($oSocket.LastErrorText & @CRLF)
    Exit
EndIf

Local $bTls = True
Local $iMaxWaitMs = 5000
$bSuccess = $oSocket.Connect("example.com",5000,$bTls,$iMaxWaitMs)
If ($bSuccess = False) Then
    ConsoleWrite($oSocket.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Connected with mutual TLS." & @CRLF)