SqexArg

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];
}