BNETDocs
C>S 0x32 SID_CHECKDATAFILE
Message Id:0x32
Message Name:SID_CHECKDATAFILE
Direction:Client to Server
Used By:Starcraft Japanese, Starcraft Broodwar
Starcraft Shareware, Starcraft Original
Warcraft II BNE
Format:

(UINT32) [5] File checksum
(STRING) File name

Remarks

This message was used to check a digest of a game file. This message is no longer used; developers should use the SID_CHECKDATAFILE2 message.

The digest is created by using the broken SHA-1 hash on the first 64-bytes of the (filesize % 64) times. This due to a bug in the client.

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