# 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](https://base64.guru/standards/base64url)
* Format it as `//**sqex0003{base64}{checksum}**//`

### Checksum

#### Pseudocode

```csharp
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];
}
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://xiv.dev/sqexarg.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.