problem with pg_hba.conf

All,

I have already posted this message yesterday but didn't get any reply yet...
Please help me with this..I am having trouble doing db authentication with
'pg_hba.conf' file..

I have added two users using 'CREATE USER' command for a db. And then I have
created two separated password file to do authentication to two different db
in the system.

Also, I have added separate lines in 'pg_hba.conf' file for two db as
follows:

local   db1                      crypt    file1.dat
local   db2                      crypt    file2.dat

But problem is I can connect to both db using both password. What I supposed
to get is, I can connect to 'db1' only with username in 'file1.dat' and
'db2' with username in 'file2.dat'. But that is not happening!!! I have
already commented out the default 'local all trust' line!!!!

Can anybody give some suggestions on this??

Thanks in advance..

Niral