BNETDocs
C>S 0x31 SID_CHANGEPASSWORD
Message Id:0x31
Message Name:SID_CHANGEPASSWORD
Direction:Client to Server
Used By:Starcraft Original, Starcraft Broodwar
Starcraft Shareware, Starcraft Japanese
Diablo Retail, Diablo Shareware
Diablo II, Diablo II Lord of Destruction
Warcraft II BNE
Format:

(UINT32) Client Token
(UINT32) Server Token
(UINT32) [5] Old password hash
(UINT32) [5] New password hash
(STRING) Account name 

Remarks

Changes Battle.net account password. This message must be sent before you logon.

Passwords should be converted to lower case before hashing.

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