## I have the following mediawiki database.

mysql> desc user;
 -------------------------- ----------------- ------ ----- --------- ----------------
| Field                    | Type            | Null | Key | Default | Extra          |
 -------------------------- ----------------- ------ ----- --------- ----------------
| user_id                  | int(5) unsigned | NO   | PRI | NULL    | auto_increment |
| user_name                | varchar(255)    | NO   | UNI |         |                |
| user_real_name           | varchar(255)    | NO   |     |         |                |
| user_password            | tinyblob        | NO   |     |         |                |
| user_newpassword         | tinyblob        | NO   |     |         |                |
| user_email               | tinytext        | NO   |     |         |                |
| user_options             | blob            | NO   |     |         |                |
| user_touched             | varchar(14)     | NO   |     |         |                |
| user_token               | varchar(32)     | NO   |     |         |                |
| user_email_authenticated | varchar(14)     | YES  |     | NULL    |                |
| user_email_token         | varchar(32)     | YES  | MUL | NULL    |                |
| user_email_token_expires | varchar(14)     | YES  |     | NULL    |                |
| user_registration        | char(14)        | YES  |     | NULL    |                |
 -------------------------- ----------------- ------ ----- --------- ----------------
13 rows in set (0.24 sec)

mysql>
## and I am accessing it using the following model:

class RemoteUser < ActiveRecord::Base

  self.table_name = "user"

  ActiveRecord::Base.establish_connection(
    :adapter  => "mysql",
    :host     => "remotewiki.com",
    :username => "remote_remote",
    :password => "passowrd",
    :database => "db"
  )

end

## How can I use the crypted_hash, id and login within acts_as_authenticated's user.rb model?

require 'digest/sha1'
class User < ActiveRecord::Base
  has_many :posts
  has_many :comments
  # Virtual attribute for the unencrypted password
  attr_accessor :password

  validates_presence_of     :login, :email
  validates_presence_of     :password,                   :if => :password_required?
  validates_presence_of     :password_confirmation,      :if => :password_required?
  validates_length_of       :password, :within => 4..40, :if => :password_required?
  validates_confirmation_of :password,                   :if => :password_required?
  validates_length_of       :login,    :within => 3..40
  validates_length_of       :email,    :within => 3..100
  validates_uniqueness_of   :login, :email, :case_sensitive => false
  before_save :encrypt_password

  # Authenticates a user by their login name and unencrypted password.  Returns the user or nil.
  def self.authenticate(login, password)
    u = find_by_login(login) # need to get the salt
    u && u.authenticated?(password) ? u : nil
  end

  # Encrypts some data with the salt.
  def self.encrypt(password, salt)
    Digest::SHA1.hexdigest("--#{salt}--#{password}--")
  end

  # Encrypts the password with the user salt
  def encrypt(password)
    self.class.encrypt(password, salt)
  end

  def authenticated?(password)
    crypted_password == encrypt(password)
  end

  def remember_token?
    remember_token_expires_at && Time.now.utc < remember_token_expires_at
  end

  # These create and unset the fields required for remembering users between browser closes
  def remember_me
    self.remember_token_expires_at = 2.weeks.from_now.utc
    self.remember_token            = encrypt("#{email}--#{remember_token_expires_at}")
    save(false)
  end

  def forget_me
    self.remember_token_expires_at = nil
    self.remember_token            = nil
    save(false)
  end

  protected
    # before filter
    def encrypt_password
      return if password.blank?
      self.salt = Digest::SHA1.hexdigest("--#{Time.now.to_s}--#{login}--") if new_record?
      self.crypted_password = encrypt(password)
    end

    def password_required?
      crypted_password.blank? || !password.blank?
    end
end