que les parece este modo de encriptacion

[JoseAlberth]

Gracias a todos lo que pasa esque tengo un problema al loguearme no me deja ingresar y no porque aca esta el codigo

Código PHP:

<?php
include_once("php_includes/check_login_status.php");
// If user is already logged in, header that weenis away
if($user_ok == true){
    header("location: user.php?u=".$_SESSION["username"]);
    exit();
}
?><?php
// AJAX CALLS THIS LOGIN CODE TO EXECUTE
if(isset($_POST["e"])){
    // CONNECT TO THE DATABASE
    include_once("php_includes/db_conx.php");
    // GATHER THE POSTED DATA INTO LOCAL VARIABLES AND SANITIZE
    $e = mysqli_real_escape_string($db_conx, $_POST['e']);
    $p = md5($_POST['p']);
    // GET USER IP ADDRESS
    $ip = preg_replace('#[^0-9.]#', '', getenv('REMOTE_ADDR'));
    // FORM DATA ERROR HANDLING
    if($e == "" || $p == ""){
        echo "login_failed";
        exit();
    } else {
    // END FORM DATA ERROR HANDLING
        $sql = "SELECT id, username, password FROM users WHERE email='$e' AND activated='1' LIMIT 1";
        $query = mysqli_query($db_conx, $sql);
        $row = mysqli_fetch_row($query);
        $db_id = $row[0];
        $db_username = $row[1];
        $db_pass_str = $row[2];
        if($p != $db_pass_str){
            echo "login_failed";
            exit();
        } else {
            // CREATE THEIR SESSIONS AND COOKIES
            $_SESSION['userid'] = $db_id;
            $_SESSION['username'] = $db_username;
            $_SESSION['password'] = $db_pass_str;
            setcookie("id", $db_id, strtotime( '+30 days' ), "/", "", "", TRUE);
            setcookie("user", $db_username, strtotime( '+30 days' ), "/", "", "", TRUE);
            setcookie("pass", $db_pass_str, strtotime( '+30 days' ), "/", "", "", TRUE); 
            // UPDATE THEIR "IP" AND "LASTLOGIN" FIELDS
            $sql = "UPDATE users SET ip='$ip', lastlogin=now() WHERE username='$db_username' LIMIT 1";
            $query = mysqli_query($db_conx, $sql);
            echo $db_username;
            exit();
        }
    }
    exit();
}
?>
 

Código PHP:

aca esta el otro 
 
<?php
session_start();
include_once("db_conx.php");
// Files that inculde this file at the very top would NOT require 
// connection to database or session_start(), be careful.
// Initialize some vars
$user_ok = false;
$log_id = "";
$log_username = "";
$log_password = "";
// User Verify function
function evalLoggedUser($conx,$id,$u,$p){
    $sql = "SELECT ip FROM users WHERE id='$id' AND username='$u' AND password='$p' AND activated='1' LIMIT 1";
    $query = mysqli_query($conx, $sql);
    $numrows = mysqli_num_rows($query);
    if($numrows > 0){
        return true;
    }
}
if(isset($_SESSION["userid"]) && isset($_SESSION["username"]) && isset($_SESSION["password"])) {
    $log_id = preg_replace('#[^0-9]#', '', $_SESSION['userid']);
    $log_username = preg_replace('#[^a-z0-9]#i', '', $_SESSION['username']);
    $log_password = preg_replace('#[^a-z0-9]#i', '', $_SESSION['password']);
    // Verify the user
    $user_ok = evalLoggedUser($db_conx,$log_id,$log_username,$log_password);
} else if(isset($_COOKIE["id"]) && isset($_COOKIE["user"]) && isset($_COOKIE["pass"])){
    $_SESSION['userid'] = preg_replace('#[^0-9]#', '', $_COOKIE['id']);
    $_SESSION['username'] = preg_replace('#[^a-z0-9]#i', '', $_COOKIE['user']);
    $_SESSION['password'] = preg_replace('#[^a-z0-9]#i', '', $_COOKIE['pass']);
    $log_id = $_SESSION['userid'];
    $log_username = $_SESSION['username'];
    $log_password = $_SESSION['password'];
    // Verify the user
    $user_ok = evalLoggedUser($db_conx,$log_id,$log_username,$log_password);
    if($user_ok == true){
        // Update their lastlogin datetime field
        $sql = "UPDATE users SET lastlogin=now() WHERE id='$log_id' LIMIT 1";
        $query = mysqli_query($db_conx, $sql);
    }
}
?>
 

Espero de que me puedan ayudar con esto