BNETDocs
C>S 0x3C SID_CHECKDATAFILE2
Message Id:0x3C
Message Name:SID_CHECKDATAFILE2
Direction:Client to Server
Used By:Starcraft Japanese, Starcraft Broodwar
Starcraft Shareware, Starcraft Original
Warcraft II BNE
Format:

(UINT32) File size in bytes
(UINT32) File hash [5]
(STRING) Filename

Remarks

Verifies that a file is authentic, by producing a hash of that file and sending it to the server for comparison to the original.

The hash is a standard SHA1 hash.

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