传中password_hash场PDO

Question

我试图处理密码的MD5到数据库中，这是有关代码：

include_once("config.php"); 
session_start(); 

if(isset($_POST['signup'])){ 
    $name = $_POST['name']; 
    $email = $_POST['email']; 
    $pass = $_POST['pass']; 

    $insert = $pdo->prepare("INSERT INTO users (name,email,pass) 
           values(:name,:email,:pass) "); 
    $insert->bindParam(':name',$name); 
    $insert->bindParam(':email',$email); 
    $insert->bindParam(':pass',$pass); 
    $insert->execute(); 
}elseif(isset($_POST['signin'])){ 
    $email = $_POST['email']; 
    $pass = $_POST['pass']; 

    $select = $pdo->prepare("SELECT * FROM users WHERE email='$email' and pass='$pass'"); 
    $select->setFetchMode(); 
    $select->execute(); 
    $data=$select->fetch(); 
    if($data['email']!=$email and $data['pass']!=$pass) { 
     echo "invalid email or pass"; 
    } 
    elseif($data['email']==$email and $data['pass']==$pass) { 
     $_SESSION['email']=$data['email']; 
     $_SESSION['name']=$data['name']; 
     header("location:profile.php"); 
    } 
} 

在db什么长度是合适的存储这个散列密码？

我如何使用：

$hashed_password = password_hash($pass, PASSWORD_DEFAULT); 
    var_dump($hashed_password); 

和if语句，如果密码是确定的？

Answer 1

一旦您阅读手册或在教程中看到示例，它确实非常简单。看评论在细节

<?php 
include_once("config.php"); 
session_start(); 

if(isset($_POST['signup'])){ 
    $name = $_POST['name']; 
    $email = $_POST['email']; 

    // at signup you hash the user provided password 
    $pass = password_hash($_POST['pass'], PASSWORD_DEFAULT); 

    $insert = $pdo->prepare("INSERT INTO users (name,email,pass) 
           values(:name,:email,:pass) "); 
    $insert->bindParam(':name',$name); 
    $insert->bindParam(':email',$email); 
    $insert->bindParam(':pass',$pass); // this stores the hashed password 
    $insert->execute(); 
}elseif(isset($_POST['signin'])){ 
    $email = $_POST['email']; 
    $pass = $_POST['pass']; 

    // as the password on the DB is hashed you cannot use the 
    // plain text password in the SELECT here as it wont match 
    $select = $pdo->prepare("SELECT * FROM users WHERE email=:email"); 

    // no idea what this was doing 
    //$select->setFetchMode(); 
    $select->bindParam(':email',$email); 
    $select->execute(); 

    $row = $select->fetch(PDO::FETCH_ASSOC); 

    // verify the plain text password against the 
    // hashed value from DB in $row['pass'] 
    if(password_verify($pass, $row['pass'])){ 
     $_SESSION['email'] = $data['email']; 
     $_SESSION['name'] = $data['name']; 
     header("location:profile.php"); 
     exit; 
    } else { 
     echo "invalid email or pass"; 
    } 
} 

并作为在数据库中，你需要保持这个散列值的列的长度的代码，它是documented in the manual

The following algorithms are currently supported:

• PASSWORD_DEFAULT - Use the bcrypt algorithm (default as of PHP 5.5.0). Note that this constant is designed to change over time as new and stronger algorithms are added to PHP. For that reason, the length of the result from using this identifier can change over time. Therefore, it is recommended to store the result in a database column that can expand beyond 60 characters (255 characters would be a good choice).

• PASSWORD_BCRYPT - Use the CRYPT_BLOWFISH algorithm to create the hash. This will produce a standard crypt() compatible hash using the "$2y$" identifier. The result will always be a 60 character string, or FALSE on failure.