我正在在线学习 php 安全性(使用 php 5.4),并遇到了以下我想了解/使用的代码。以下代码是否使用 bcrypt,它是河豚的良好实现吗?如果存在问题,您能否建议修复或资源。谢谢。
    class PassHash {  
    // blowfish  
    private static $algo = '$2a';  
    // cost parameter  
    private static $cost = '$10';  
    // mainly for internal use  
    public static function unique_salt() {  
        return substr(sha1(mt_rand()),0,22);  
    }  
    // this will be used to generate a hash  
    public static function hash($password) {  
        return crypt($password,  
                    self::$algo .  
                    self::$cost .  
                    '$' . self::unique_salt());  
    }  
    // this will be used to compare a password against a hash  
    public static function check_password($hash, $password) {  
        $full_salt = substr($hash, 0, 29);  
        $new_hash = crypt($password, $full_salt);  
        return ($hash == $new_hash);  
    }  
}  
这是用户注册期间的用法:
// include the class 
require ("PassHash.php");
// ...
// read all form input from $_POST
// ...
// do your regular form validation stuff
// ...
// hash the password
$pass_hash = PassHash::hash($_POST['password']);
// store all user info in the DB, excluding $_POST['password']
// store $pass_hash instead
// ...
这是用户登录过程中的用法:
// include the class  
require ("PassHash.php");        
// read all form input from $_POST
// ...
// fetch the user record based on $_POST['username']  or similar  
// ...
// ... 
// check the password the user tried to login with  
if (PassHash::check_password($user['pass_hash'], $_POST['password']) {  
    // grant access  
    // ...  
} else {  
    // deny access  
    // ...  
}