php – 从sha1 salted密码验证用户登录

这是我的添加用户表单：

session_start();
include("includes/resume.config.php");

// make sure form fields have a value and strip them
function check_input($data,$problem='')
{
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
if ($problem && strlen($data) == 0)
{
    die($problem);
}
    return $data;
}

// get form values,escape them and apply the check_input function
$name = $link->real_escape_string(check_input($_POST['name'],"Please enter a name!"));
$email = $link->real_escape_string(check_input($_POST['email'],"Please enter an email!"));
$password = $link->real_escape_string(check_input($_POST['password'],"Please enter a password!"));

// generate a random salt for converting passwords into MD5
$salt = bin2hex(mcrypt_create_iv(32,MCRYPT_DEV_URANDOM));
$saltedPW =  $password . $salt;
$hashedPW = sha1($saltedPW);

mysqli_connect($db_host,$db_user,$db_pass) OR DIE (mysqli_error());
// select the db
mysqli_select_db ($link,$db_name) OR DIE ("Unable to select db".mysqli_error($db_name));

 // our sql query
$sql = "INSERT INTO admins (name,email,password,salt) VALUES ('$name','$email','$hashedPW','$salt');";

//save the updated information to the database          
mysqli_query($link,$sql) or die("Error in Query: " . mysqli_error($link));

if (!mysqli_error($link)) 
{
    header("Location: file_insert.php");
}

这是我的登录脚本：这是不起作用的

function check_input($data,$problem='')
{
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
if ($problem && strlen($data) == 0)
{
    die($problem);
}
    return $data;
}

if(isset($_POST['submitLogin'])) { //form submitted?

// get form values,"Please enter a name!"));
$password = $link->real_escape_string(check_input($_POST['password'],"Please enter a password!"));

$saltQuery = $link->query('SELECT salt FROM admins WHERE name = "'.$name.'"');

$salt = mysqli_fetch_assoc($saltQuery);
$saltedPW =  $password . $salt;
$hashedPW = sha1($saltedPW);

mysqli_connect($db_host,$db_name) OR DIE ("Unable to select db".mysqli_error($db_name));

$validate_user = $link->query('SELECT id,name,password FROM admins WHERE name = "'.$name.'" AND password = "'.$hashedPW.'"');

if ($validate_user->num_rows == 1) {
    $row = $validate_user->fetch_assoc();
    $_SESSION['id'] = $row['id'];
    $_SESSION['loggedin'] = TRUE;
    Header('Location: file_insert.php');
} else {
    print "<center><p style='margin-top: 200px; font-weight: bold;'>Invalid Login Information</p>";
    print "<a href='admin-login.php'>Click here</a> to return to the login page.</center>";
}
}