Protocols/OSCAR/SNAC/BUCP CHALLENGE REQUEST

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ID Origin Name Foodgroup Service Status Version
0x0017, 0x0006 Client BUCP__CHALLENGE_REQUEST Unspecified BUCP Active 1.15

Request challenge for login request.

SNAC Header

Foodgroup uint16 (word) 00 17
Subgroup uint16 (word) 00 06
Flags uint16 (word) 00 00
Request ID uint32 (dword) 00 00 00 00

SNAC Data

Unconfirmed: This SNAC contains no data

From Aleksandr Shutko: SNAC(17,06) BUCP__CHALLENGE_REQUEST


This is the first snac in md5 crypted login sequence. Client use this snac to request login random key from server. It contain screenname and some unknown stuff. Server should reply with SNAC(17,07), containing auth key string.

 00 17   word   SNAC family
 00 06   word   SNAC subtype
 00 00   word   SNAC flags
 xx xx xx xx   dword   SNAC request-id
 00 01   word   TLV.Type(0x01) - screen name
 xx xx   word   TLV.Length
 xx ..   string   Screen name
 00 4B   word   TLV.Type(0x4B) - unknown (empty)
 00 00   word   TLV.Length
 00 5A   word   TLV.Type(0x5A) - unknown (empty)
 00 00   word   TLV.Length
 May contain other tlv from the following list


Example SNAC dump with flap header:


  2A 02 0A 46 00 1D 00 17  00 06 00 00 00 00 00 00 *..F............
  00 01 00 07 36 32 31 38  38 39 35 00 4B 00 00 00 ....6218895.K...
  5A 00 00                                         Z..


BUCP SNACs

SNAC List
Subgroup Origin Name
0x0001 Any BUCP__ERR
This is the error SNAC for the BUCP foodgroup.
0x0002 Client BUCP__LOGIN_REQUEST
Client login request.
0x0003 Host BUCP__LOGIN_RESPONSE
Host login response, will contain reconnect information with login cookie or an error code and/or URL.
0x0004 Client BUCP__REGISTER_REQUEST
Client registration for legacy ICQ clients.
0x0005 Host BUCP__REGISTER_RESPONSE
Host response to BUCP__REGISTER_REQUEST. May contain confirmation of registration or an error code and/or URL.
0x0006 Client BUCP__CHALLENGE_REQUEST
Request challenge for login request.
0x0007 Host BUCP__CHALLENGE_RESPONSE
Response to BUCP__CHALLENGE_REQUEST with challenge.
0x0008 NCD BUCP__ASASN_REQUEST
This is not currently documented.
0x0009 NCD BUCP__ASASN_RESPONSE
This is not currently documented.
0x000A Host BUCP__SECURID_REQUEST
Host SecurID request for client to continue logging in.
0x000B Client BUCP__SECURID_RESPONSE
Client response to BUCP__SECURID_RESPONSE with SecurID code.