CD‐Key service

CD-Key service validated online key activation and authorized the game for online feature access.

Protocol

Internally CD-Key service uses the following classes:

• clDataList for data serialization
• clCDKeyMessage (a wrapper for clSimpleMessage) for data encryption
• CMessageBuffer for message queueing

Transaction

There are 5 request/response exchanges with the CD Key service:

1. Challenge
2. Key activation
3. Authorization
4. Validation
5. Player status

Challenge Request

Initial handshake with the server.

Request

Payload

struct cdKeyActChalReq {
  unsigned char msgType;
  unsigned int size;
  unsigned char encDataList[18];
};

Note:

1. msgType is 0xD3
2. size is big-endian
3. After decryption (Blowfish), the data list contains:
   • message ID - incremental packet id (string)
   • request ID - 1 (string)
   • unknown - 1 (string)
   • empty data list

Response