$PostgreSQL: pgsql/contrib/chkpass/README.chkpass,v 1.5 2007/10/01 19:06:48 darcy Exp $
Chkpass is a password type that is automatically checked and converted upon
entry. It is stored encrypted. To compare, simply compare against a clear
text password and the comparison function will encrypt it before comparing.
It also returns an error if the code determines that the password is easily
crackable. This is currently a stub that does nothing.
I haven't worried about making this type indexable. I doubt that anyone
would ever need to sort a file in order of encrypted password.
If you precede the string with a colon, the encryption and checking are
skipped so that you can enter existing passwords into the field.
On output, a colon is prepended. This makes it possible to dump and reload
passwords without re-encrypting them. If you want the password (encrypted)
without the colon then use the raw() function. This allows you to use the
type with things like Apache's Auth_PostgreSQL module.
The encryption uses the standard Unix function crypt(), and so it suffers
from all the usual limitations of that function; notably that only the
first eight characters of a password are considered.
Here is some sample usage:
test=# create table test (p chkpass);
CREATE TABLE
test=# insert into test values ('hello');
INSERT 0 1
test=# select * from test;
p
----------------
:dVGkpXdOrE3ko
(1 row)
test=# select raw(p) from test;
raw
---------------
dVGkpXdOrE3ko
(1 row)
test=# select p = 'hello' from test;
?column?
----------
t
(1 row)
test=# select p = 'goodbye' from test;
?column?
----------
f
(1 row)
D'Arcy J.M. Cain
darcy@druid.net
c2862e3cad