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Introduction
CHL is a command introduced with MSNP6.
It is a Notification Server command, without a request or response payload.
A request to generate a challenge. Respond with QRY on a new transaction to continue your connection.
Client/Request
CHL TrID
Server/Response
CHL TrID challenge
If this command is sent asynchronously, the Transaction ID will be 0 instead.
Where challenge is usually a 20-character numeric value (but can be any valid string)
that is concatenated with the client's Private Key.
Examples
From server at any time
S: CHL 0 12345678901234567890
Requested challenge
C: CHL 1
S: CHL 1 12345678901234567890
Challenge timeout
S: CHL 0 12345678901234567890
... some time passes ...
S: OUT
Server disconnects client.
Known changes
- MSNP11: Challenge response (QRY commands)'s algorithm changed to be more formidable.