We'll create fresh WordPress site with Joomla to WP Migrated Users Authentication Plugin installed. You have 20 minutes to test the plugin after that site we'll be deleted.
Joomla encrypted passwords should be stored in user meta key “joomlapass”.
When user is authenticated first time after migration
password provided by user is encrypted by “joomla way”
and compared with value in “joomlapass” meta key.
If password is correct WP user is udated – password encrypted by “wordpress way”
is stored to “user_pass” field.
Then user can be authenticated by standart wordpress authentication plugin.
Meta key “joomlapass” is renamed to “joomlapassbak” to avoid repeatedly updating WP password.
plugin is free for any purpose…
Put question here: http://lovelyland.info/1/joomla2wp-mig-auth-plugin/