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When you save a screenshot in Super Smash Bros. for Wii U on the SD card it writes to, it makes two files: a .JPG and a .BIN file. Both these files are in the format of HNI_XXXX.EXTENTION, where XXXX is the number of the screenshot. I believe that the .BIN file is (at least in part) a checksum to verify that the images are not edited (outside of the game), because modifying the .JPG file in any way will cause the game to refuse to recognize it.

Since the .BIN file is always 32-bytes exactly, I've tried using some of the common 265-bit checksums like SHA-256, and GOST. But none have ever matched up what has been contained in the .BIN files.

I've included three sets of images and their respective checksums in a convenient zip file, so please take a look.

Does anyone have any ideas what checksum Super Smash Bros. might be using? If you need any more details I'd be more than happy to provide them.

  • The sha-256 checksums of the image does not match with the ones you provided. Perhaps you may like to upload the images to a service which does not alter them. – 0xec Mar 29 '16 at 20:01
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    I'm voting to close this as off-topic because this is not a question about reverse engineering. If the only two datapoints are a data file and a digest, then there's nothing to reverse engineer. If you'd like to share the code for the software that generates the digest, then feel free to re-open this question. – Jason Geffner Mar 29 '16 at 20:09
  • @ExtremeCoders Sorry about that. I've added a link to download a zip file containing them all. Hopefully they didn't get messed up this time. :) – Miguel Mar 30 '16 at 4:56

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