My SQL Table：
|-ID-|-Username-|-EmailAddress-|-ePassword-|-Permissions-|
----------------------------------------------------------
| 1 | Admin | | | |
| 2 | Foo|<emailaddress>|<cpassword>| <default 1>|
| | | | | |
| | | | | |
下面的代码从表单中获取_POST数据，然后引用数据库以检查用户名是否正确，一旦用户名正确，我希望能够$password与数据库中的ePassword进行比较，
ePassword是使用加密进行加密的。php.net 中关于crypt的一个例子说我必须这样做：
if (hash_equals($hashed_password, crypt($user_input, $hashed_password)) {
echo "Password verified!";
}
比较密码，所以我的将是：
if (hash_equals($hashed_password, crypt($password, $hashed_password)) { //changed $user_input to password
echo "Password verified!";
}
但是，我将如何从数据库中获取ePassword并进行比较呢？
//User data
$username = strtolower($_POST['username']);
$password = $_POST['password'];
//login check
if($_SESSION['loggedIn'] != "") {
echo 'You already are using an Account!';
} else if($_SESSION['loggedIn'] == "") {
//connect to database
$con = mysqli_connect($db_host, $db_user, $db_pass, $db_name);
//check for connection errors
if (!$con) {
die('Could not connect: ' . mysql_error());
};
//checks for username
$stmt = $con->prepare("SELECT * FROM Users WHERE Username=?");
$stmt->bind_param("s", $username);
$stmt->execute();
$stmt->store_result();
$userCheck = $stmt->num_rows;
if($userCheck > 0) {
//Password check goes here
} else {
};
$con->close();
};
TL;DR：我想将$password与我的数据库中的ePassword与crypt进行比较，我该怎么做？
// username and password sent from Form
$username=$_POST['username'];
$password=$_POST['password'];
$password=crypt($password,saltUsedWhileRegisteringUser); // Encrypted Password
//Assuming ePassword is the crypted password inserted into DB while User Registeration
$sql="SELECT id FROM admin WHERE username='$username' and ePassword ='$password'";
$result=mysql_query($sql);
$count=mysql_num_rows($result);//If count > 1 then valid user else not a valid one.
if($userCheck > 0) {
//Password check goes here
$stmt->bind_result($id, $username,$emailAddress,$ePassword,$permissions);
$password = crypt($password,'the same salt used to create ePassword. without it the string will be always random');
if (hash_equals($password,$ePassword) {
echo 'user logged in';
else
echo 'invalid password';
}
}