This is in my AdminController

  def createuser
    @user = User.new(params[:user])
    @user.password = params[:post][:password_first]
    @user.password_hash
    @user.password_salt
    if @user.save
      flash[:notice] = "The user was successfully created."
      redirect_to :action => "listusers"
    else
      render :action => "newuser"
    end


Here is my user model


require 'digest/sha2'
class User < ActiveRecord::Base

  has_and_belongs_to_many :groups

  def self.authenticate(username, password)
    user = User.find(:first, :conditions => ['username = ?', username])
    if user.blank? || Digest::SHA256.hexdigest(password + user.password_salt) != user.password_hash
      raise "Please provide a valid username and password and we will send you right along."
    end
    user
  end

  def password=(pass)
    salt = [Array.new(6){rand(256).chr}.join].pack("m").chomp
    self.password_salt, self.password_hash = salt, Digest::SHA256.hexdigest(pass + salt)
  end

  def has_right_for?(action_name, controller_name)
    groups.detect{ |group| group.has_right_for?(action_name, controller_name) }
  end

  # Fun easy validation
  validates_uniqueness_of :username, :on => :create, :message => "is already in the system."
  validates_uniqueness_of :username, :on => :update, :message => "is already in the system."
  validates_uniqueness_of :email, :on => :create, :message => "is already in the system."
  validates_uniqueness_of :email, :on => :update, :message => "is already in the system."

	validates_format_of :username, :with => /^[A-Za-z][A-Za-z0-9\-\_]{2,39}$/, :message => "can only consist of letters, numbers, -, and _"
	validates_format_of :first_name,:with => /^[A-Za-z0-9\-\s]*$/
	validates_format_of :middle_name, :with => /^[A-Za-z0-9\-\s]*$/
	validates_format_of :last_name,:with => /^[A-Za-z0-9\-\s]*$/
  validates_format_of :email, :with => /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/, :message => "is not valid."

  validates_length_of :email, :maximum=> 100, :message => "may only be a maximum of 100 charactars."
  validates_length_of :ip_address, :maximum => 15, :message => "is too long (format: ###.###.###.###)."
 	validates_length_of :first_name, :maximum => 40, :allow_nil => true
 	validates_length_of :middle_name, :maximum => 40, :allow_nil => true
  validates_length_of :last_name, :maximum => 40, :allow_nil => true

  validates_presence_of :username, :email, :ipaddr

  validates_numericality_of :confirmed, :on => :create
  validates_numericality_of :confirmed, :on => :update

end