After the Mac has restarted, you'd normally now need to change the password for the keychain called "login" to match the new admin password, but since you've forgotten it you'll need to delete the old login keychain.
Do the following steps: Choose Keychain List from the Edit menu. Select the "login" keychain.
Change your keychain password to match your user password
Click Delete the "-" button. The login keychain will now be empty.
The next time the keychain is needed you'll have to manually enter the appropriate password and then you'll be asked if you want to store the password in the keychain. Just move it to a backup. Just in case, y'know?
Thanks Also to PichardP. I'll be reunited with my Mac tomorrow and will give it a go and report back.
UCI Health Information Services - Password Manager - Mac OS X: Resetting your passwords in Keychain
Unfortunately, the short answer is "you can't recover a keychain password". Normally, your "login.
If you change your password in the System Preferences it will be changed automatically in login. This often happens to users who are bound to Active Directory since they are periodically forced to reset their passwords independently of their keychains.
Then all hell breaks loose once they forget what their OLD password was. In other news, please do not forget your FileVault password. That's not to say you're hosed. You just need to delete your old login. However, the point of my original post was that you will not be able to get the items inside the keychain back. They are bound-bound-bound to that old password.
My rain barrel won't swell. This is the password you were using before the password was reset.
If you need to update your keychain password on Mac
This is the password you're now using to log in to your Mac. Enter the same password in the Verify field. Click OK when done, then quit Keychain Access. Published Date: Mon Aug 28 Yes No. Character limit: Maximum character limit is