Hash keys with MD5; track IBinders not IInterface

Using a plaintext password doesn't work unless it's a certain length, so
just hash the plaintext password with MD5 to make it the right length
for the twofish encryption.

Tracking the IInterface doesn't make much sense since it's different
each time, so track the IBinder instead. That way we can unlinkToDeath
the binder when the last thing it's holding onto goes away.

Change-Id: Id828d25b4d74f27e9d8b4bfb3909c964469cc473