Encoded Process Argument

Upon launching the game, the retail launcher passes handful of information (e.g. login token, client language, etc...) to the game that usually looks like this:

//**sqex0003VGhpcyBpcyBqdXN0IGZvciBleGFtcGxlIHB1cnBvc2U7IGl0IGFjdHVhbGx5IG5ldmVyIGxvb2sgbGlrZSB0aGlzA**//

Encoding Process

• Encrypt UTF-8 plain text using Blowfish; you need to pad the buffer with zero as needed

  • Key is GetTickCount() & 0xFFFF_0000

  • Block cipher mode of operation is ECB (yes, you read it right.)

• Convert encrypted bytes to Base64URL​

• Format it as //**sqex0003{base64}{checksum}**//

Checksum

Pseudocode

char[] ChecksumTable = {
    'f', 'X', '1', 'p', 'G', 't', 'd', 'S',
    '5', 'C', 'A', 'P', '4', '_', 'V', 'L'
};
​
char GetChecksum(uint key) {
    // mask the nibble we're looking for
    var value = key & 0x000F_0000;
​
    return ChecksumTable[value >> 16];
}