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Table-Blocks can be decrypted by random access using only their multiple-of-512 block index and the the UserKey. Table-Blocks and Data-Blocks are encrypted differently using the same UserKey. sai file will be referred to as the UserKey since this is the only symmetrical key used to decrypt and encrypt files generated by the end-ser. Different files related to Sai use different static keys. Return (BlockIndex & 0x1FF) ? true: false Īll blocks are encrypted and decrypted symmetrically using a simple exclusive-or-based encryption which refers to a static atlas of 256 32-bit integers which can be found at the end of this text. Return (BlockIndex & 0x1FF) ? false: true īool IsDataBlock(std:: size_t BlockIndex)

#PAINTTOOL SAI CURSOR OFFSET HOW TO#

Demonstrating how to quickly determine if a block Index is a data-block or a table-block bool IsTableBlock(std:: size_t BlockIndex)

Std:: size_t NearestTable(std:: size_t BlockIndex) Gets the Table-Block index appropriate for the current block index Every other block that is not a Table-Block is a Data-Block: Every block index that is a multiple of 512( 0, 512, 1024, etc) is a Table-Block containing meta-data about the block itself and the 511 blocks after it. sai documents and very partially show related information for the other files.Īn individual block in a. This document will mostly cover the method used for sai's user created.

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It's been found that some preliminary files such as thumbnails and the archive responsible for swatches/palettes use a different decryption key, block size, and Table-Block location. The file itself is encrypted in ECB blocks in which any randomly accessed block can be decrypted by also decrypting the appropriate Table-Block and accessing its 32-bit key found within. Each layer, mask, and related meta data is stored in an individual pseudo-file which also has a layer of block-level encryption. sai file among with other files such as thumbnails, the sai.ssd file and others is but an archive containing a file-system-like structure once decrypted. sai as its document format for storing both raster and vector layers as well as other canvas related meta-data.

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Data protection function to avoid abnormal termination such as bugs.Ĭopyright 1996-2016 SYSTEMAX Software Development Decryption.

Simple but powerful user interface, easy to learn.

Highly accurate composition with 16bit ARGB channels.

PaintTool SAI is high quality and lightweight painting software, fully digitizer support, amazing anti-aliased paintings, provide easy and stable operation, this software make digital art more enjoyable and comfortable. This document assumes you have some knowledge of the C and C++ syntax as the data structures and algorithms here will be presented in the form of C and C++ structures and subroutines. Previous work includes my now-abandoned run-time exploitation framework SaiPal and the more recent Windows explorer thumbnail extension SaiThumbs. If you find anything in this document to be misleading, incomplete, or flat-out incorrect feel free to shoot me an email at Wunkolo (at). sai files or just to get a comprehensive understanding of the decisions that SYSTEMAX has chosen to make for their file format. This document is more directed at anyone that wants to implement their own library to read or interface with. sai file format used to archive a user's artwork and the layers of abstraction implemented by SYSTEMAX for extracting this data outside of the context of the original software. This write-up in particular is focused on the technical specifications of the user-created.

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NOTE: The zipped files can be imported into the Desktop version of Sketchbook Pro without extracting.This document represents about a year and a half of off-and-on hobby-research on reverse engineering the digitizing raster/vector art program PaintTool Sai.

The zipped file will download correctly and you will have. To correct this issue, use a different browser, such as Google Chrome. zip format can be an issue when using the Microsoft Edge and Internet Explorer browser to download the free brushes. zip format, there is no need to extract them.

Locate the downloaded brushes (usually in your Downloads folder).

Tap the upper right corner of a brush set to access its marking menu.

If you download the brushes and they aren't automatically installed, you can manually import the brush set.

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The free brushes will not install on the iOS and Android versions of Sketchbook.

You can only install the free brushes on on Sketchbook Pro for desktop (Mac and Windows version 8.x or higher) and Autodesk SketchBook UWP version 5.x.

There are some key points you should keep in mind: You can download additional free brushes ‍from our Extras library!

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