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POMicrosoft Symbol Server / Local Cache Hash Algorithm
 

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    <p>I am trying to figure out what hashing algorithm is used for the Microsoft Symbol Local Cache directory.</p> <p>For example, the local cache can be something like the following</p> <pre> L:\Symbols \browseui.dll \44FBC679fe000 browsue.dll \browseui.pdb \44F402F62 browseui.pdb \explorer.exe \3EBF1F14f7000 explorer.exe \explorer.pdb \3EBF1F141 explorer.pdb \msvcr71.pdb \60D915C6AB6A4F3586E9096E2F8856482 msvcr71.pdb </pre> <p>There seems to be some sort of correspondence between a file and its debug database. Other than that, I can’t figure out how the names of these (presumably) hexadecimal string folders are being generated.</p> <p>Some of them are 9 digits, some 13 digits, and others are 33 digits. It looks like an actual, live-file (which for some reason is stored in the symbol cache) has a 13-digit hash while its (nearly similar) debug database gets a 9-digit hash. Some debug databases get a 13-digit hash; can’t figure out what makes these ones special, although they don’t have a corresponding live-file.</p> <p>I’ve tried hashing the files with every kind of hash algorithm that I know of (39 of them) and none match in any way (straight up, reversed, alternate endian’d, etc.)</p> <p>Any ideas?</p> <p><strong>Update</strong> I think I finally found it. From <a href="http://msdn.microsoft.com/en-us/library/windows/hardware/ff558839(v=vs.85).aspx" rel="nofollow noreferrer">Symbol Storage Format</a>:</p> <blockquote> <p>SymStore uses the file system itself as a database. It creates a large tree of directories, with directory names based on such things as the symbol file time stamps, signatures, age, and other data.</p> </blockquote> <p><strong>Edit</strong> Dang, unfortunately it only mentions that the directory name is derived from various aspects (not quite a hash I guess), but does not say exactly how. The search continues… :-(</p>
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