Heya!
SMF uses one way encryption to generate the password hash (sha1, unlike vBulletin, which uses md5), plus a rather pointless salt which is nothing else but the username in lowercase (last time we worked on SMF, at least).
So, to put it simply, there is no way to do it. The only passwords you can import in vBulletin from other systems are unencrypted ones or those that went through a single md5 encryption.
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