[squid-users] reverse proxy and https

I'm am attempting to setup up squid as a reverse proxy to handle https
requests. ie client-ssl -> squid -> web server. I've added the following
to a default squid.conf
https_port 10.1.1.2:443 cert=cerfile key=keyfile
With this line added I get the following error in cache.log:
2003/10/22 12:45:32| Using private key in keyfile
FATAL: Failed to acquire SSL private key: error:0906406D:PEM
routines:DEF_CALLB\
ACK:problems getting password

I'm using a cert and key file that are valid and I do know the key file
password but how do I tell squid what that password is ?

Are there problems in setting squid up to work in this manner ?

Thanks,
Dan