安全密码生成和存储

Secure password generation and storage(安全密码生成和存储)

问题描述

我正在构建一个登录系统，我想确保我正在编写编写代码以在数据库中生成和存储密码.$options['passwd'] 是用户选择作为密码的字符串.

I'm building a login system and I want to be sure I'm writing the write code to generate and store passwords in the db. $options['passwd'] is the string selected as a password by the user.

这是我生成哈希的代码:

This is my code to generate a hash:

public function createPasswd($options) {
    $hash_seed = 'm9238asdasdasdad31d2131231231230132k32ka¡2da12sm2382329';
    $password = $options['passwd'];
    $date =  new DateTime();
    $timestamp = $date->getTimestamp();
    $rand_number = rand($timestamp,$timestamp + pow(91239193912939123912,3));
    $rand = pow($rand_number, 12);
    $salt = str_shuffle($rand.$hash_seed);
    $hash = crypt($password, $salt);
    return $hash;
}//End class createPasswd

我只是将哈希值存储在数据库中，然后将其与用户密码进行比较，如下所示:

I just store the hash on the database and then compare it with user's password like the following:

if ($hash == crypt($password, $hash)) {
    echo 'Password is valid!';
} else {
    echo 'Invalid password.';
}

这够强吗?我错过了什么大问题吗?

Is this strong enough? Am I missing some big issue?.

推荐答案

更长的盐并不意味着更好的保护.您没有正确使用 crypt 功能.$salt 参数不应该是一个简单的随机字符串.

Longer salt doesn't mean better protection. You don't use crypt function properly. $salt argument should not be a simple random string.

考虑这个例子:

echo crypt('password one', 'salt lorem ipsum dolor sit amet');  
echo crypt('password two', 'salt');

两者都将返回相同的字符串！(sa3tHJ3/KuYvI)

Both will return the same string ! (sa3tHJ3/KuYvI)

查看 http://php.net/crypt 了解更多关于如何正确使用 $salt 的信息.

Check http://php.net/crypt for more information about how to use $salt the correct way.

最好(更安全?)保留一个唯一的 hash_seed 代码端，然后在数据库中只存储一个组合密码和 hash_seed 的字符串的 sha 哈希(或其他算法).

It's also much better (safer?) to keep an unique hash_seed code side and then store in the database only a sha hash (or other algo) of a string combining the password and your hash_seed.

正确的实现是:

define('SECRET_KEY', 'm9238asdasdasdad31d2131231231230132k32ka¡2da12sm2382329');  // longer is better

public function createPasswd($options) {
    return hash('sha256', SECRET_KEY . $options['passwd']);
}

检查密码:

if ($stored_hash == hash('sha256', SECRET_KEY . $password) {
    echo 'Password is valid!';
} else {
    echo 'Invalid password.';
}

sha256 可以替换为您系统上的任何可用算法.获取完整列表:

sha256 can be replaced with any available algorithms on your system. Get the complete list with :

var_dump(hash_algos());

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