WordPress Password Cracker
This plugin compares a list of passwords against the user accounts in a WordPress blog, using the password hashing functions built into WordPress. It can be a useful tool for auditing your user’s choice of passwords. This plugin uses no functions or data not already available to other plugins, or administrators.
The password dictionary is stored in ‘dictionary.txt’ in the plugin’s home directory. A small sample dictionary of common passwords is included. The check is run in the background: due to the secure hashing algorithm large dictionaries may take a long time to check. Use the sample dictionary to gauge the performance of a more thorough check.