I would like record a field (wich is a password) encrypted in my database. I have to encrypt it directly inside my module not in my PostgreSQL database. I did the following :

import md5
import os
from openerp.osv import osv, fields


###### Encrypton of passwords ######

CRYPT64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'

def make_salt():
    sbytes = os.urandom(8)
    return ''.join([CRYPT64[ord(b) & 0x3f] for b in sbytes])

def md5crypt(password, salt, magic='$1$'):
    if salt is None:
        salt = make_salt()

    m = md5.new()
    m.update(password + magic + salt)

    mixin = md5.new(password + salt + password).digest()
    for i in range(0, len(password)):
        m.update(mixin[i % 16])

    # Then something really weird...
    # Also really broken, as far as I can tell.  -m
    i = len(password)
    while i:
        if i & 1:
            m.update('\x00')
        else:
            m.update(password[0])
        i >>= 1

    final = m.digest()
    return final

md5crypt(pass_pid)

###### Creation of password table ######
class password(osv.osv):

    _inherit = 'res.partner'

    _columns = {
        'passwords': fields.one2many('password.table','name_pid','user_pid')

   }
password()

class password_table(osv.osv):
    _name="password.table"

    _columns = {
            'name_pid':fields.many2one('res.partner', 'name', required=True),
            'user_pid':fields.char("UserName", size=128, required=True),
            'host_pid':fields.char("IP/HostName", size=128, required=True),
            'pass_pid':fields.function(md5crypt, type="text", string="password", size=128, required=True),
            'com_pid':fields.text("Comment")
        }
password_table()

The error is about my parameters but I don't know at all how to modify that!