Xojo Plugin

Upgrade a Plain TCP Connection to TLS

See more Socket/SSL/TLS Examples

Demonstrates Socket.ConvertToSsl, which upgrades an already-connected plain TCP socket to TLS by performing a client-side TLS handshake over the existing connection.

Background. This supports STARTTLS-style upgrades, where a protocol begins in plaintext and switches to TLS at a defined point. Perform the protocol-specific negotiation first, then call ConvertToSsl.

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Xojo Plugin

Dim success As Boolean
success = False

Dim socket As New Chilkat.Socket

//  Connect as plain TCP (no TLS yet).
Dim bTls As Boolean
bTls = False
Dim maxWaitMs As Int32
maxWaitMs = 5000
success = socket.Connect("example.com",5000,bTls,maxWaitMs)
If (success = False) Then
    System.DebugLog(socket.LastErrorText)
    Return
End If

//  At the point where the application protocol permits a STARTTLS-style upgrade, perform any required
//  negotiation, then upgrade the existing connection to TLS with a client-side handshake.
success = socket.ConvertToSsl()
If (success = False) Then
    System.DebugLog(socket.LastErrorText)
    Return
End If

System.DebugLog("Connection upgraded to TLS.")