Encryption of .pgpass

Dear Bruce san.

I may be quite persistent.:-)
I seasoned the proposal method. It was very painful that the
conventional connection method to this password was a plain text.
Although I am simple, I desire the support. Furthermore, the relation
between a field item and an environment variable is complicated.

ex.)
inetrt% pqpasswd -U postgres -d postgres
New Password:
Retype New Password:
Succeeded in creation.
inetrt% pqpasswd -U postgres -d postgres -l
/home/saito/.pgpass
hostname=localhost port=5432 dbname=postgres username=postgres password=**********
This 1th line is used.
inetrt% cat /home/saito/.pgpass
localhost:5432:postgres:postgres:postgres
inetrt% psql postgres postgres
Welcome to psql 8.2devel, the PostgreSQL interactive terminal.
Type:  \copyright for distribution terms
       \h for help with SQL commands
       \? for help with psql commands
       \g or terminate with semicolon to execute query
       \q to quit
postgres=#

inetrt% rm /home/saito/.pgpass
inetrt% pqpasswd -U postgres -d postgres -m
New Password:
Retype New Password:
Succeeded in creation.
inetrt% pqpasswd -U postgres -d postgres -m -l
/home/saito/.pgpass.md5
hostname=localhost port=5432 dbname=postgres username=postgres password=**********
This 1th line is used.
inetrt% cat /home/saito/.pgpass.md5
localhost:5432:postgres:postgres:md53175bce1d3201d16594cebf9d7eb3f9d
inetrt% psql postgres postgres
Welcome to psql 8.2devel, the PostgreSQL interactive terminal.
Type:  \copyright for distribution terms
       \h for help with SQL commands
       \? for help with psql commands
       \g or terminate with semicolon to execute query
       \q to quit
postgres=#

inetrt% rm /home/saito/.pgpass.md5
inetrt% psql postgres postgres
Password for user postgres:
Welcome to psql 8.2devel, the PostgreSQL interactive terminal.
Type:  \copyright for distribution terms
       \h for help with SQL commands
       \? for help with psql commands
       \g or terminate with semicolon to execute query
       \q to quit

I tried correspondence by sufix of md5 to .pgpass, in order to maintain compatibility.
I wish that it is fully reviewed. Thanks.

Regards,
Hiroshi Saito