I decided to make a quick version of crowbarDMG that works on OSX Keychain files. So here you go. Right now in v1.0 it only works exactly as crowbarDMG does and finds the main unlock password. It is a good deal faster testing keychain files than disc images. Like crowbarDMG it is Leopard only. I am looking out a way to dump the contents of a keychain once it unlocks. If I can come up with a good solution I will release an update via the auto update mechanism.
Thanks to the following code and frameworks: