I am no expert, but I believe you can have a different hash for the same password. More likely its the login module that isnt working for you? Are you using the J-SMF login module?

Hi, I have exactly the same problem while testing an SMF - Joomla! integration.

Some more details.

-The initial forum was in phpbb and was converted to SMF.
-Then, at a later time (already converted to SMF), it was converted from ISO-8859-7 to UTF-8. This caused users with greek usernames not being able to login. So far, most of the active users have already updated their passwords, so, this has not been a big problem for them.
-Right now, I have set up a testing environment and I am trying to migrate users from SMF to Joomla!. I followed the necessary steps (as I have done before without problems) and the following problems occured:
* There was no message at all informing about users imported.
UPDATE: Resolved - there were too many users whose data did not conform with Joomla! standards, so, this one is no longer a problem.
* When I try to login with an existing username, login fails in Joomla! but succeeds in SMF. So far, I could not verify whether this is a problem specific to usernames with greek characters.

As far as I have found out, SMF stores the password as a combined SHA1 of username and password, with salt on it. Could this mean that there can be no solution to this problem?

Thank you in advance.