使用 Rfc2898DeriveBytes 将 C# PBKDF2 转换为 PHP [英] Convert C# PBKDF2 using Rfc2898DeriveBytes to PHP

问题描述

长话短说，我们有一个内置于 .NET 的会员系统，我们正在将其移植到 WordPress，并且需要复制 PBKDF2 加密，以便用户无需重置密码.

Long story short have a membership system built in .NET that we are porting to WordPress and need to replicate the PBKDF2 encryption so users don't need to reset their passwords.

使用已知的散列密码，我可以使用以下代码轻松地在 .NET 中复制此密码:

Using a know hashed password I've been able to replicate this in .NET easily, with the following code:

static void Main(string[] args)
{
  var isValid = CheckPassword("#0zEZcD7uNmv", "5SyOX+Rbclzvvit3MEM2nBRaPVo2M7ZTs7n3znXTfyW4OhwTlJLvpcUlCryblgkQ");
}

public static int PBKDF2IterCount = 10000;
public static int PBKDF2SubkeyLength = 256 / 8; // 256 bits
public static int SaltSize = 128 / 8; // 128 bits

private static bool CheckPassword(string Password, string ExistingHashedPassword)
{
  byte[] saltAndPassword = Convert.FromBase64String(ExistingHashedPassword);
  byte[] salt = new byte[SaltSize];

  Array.Copy(saltAndPassword, 0, salt, 0, SaltSize);

  Console.WriteLine("--Salt--");
  Console.WriteLine(Convert.ToBase64String(salt));

  string hashedPassword = HashPassword(Password, salt);

  Console.WriteLine("--HashedPassword--");
  Console.WriteLine(hashedPassword);

  return hashedPassword == ExistingHashedPassword;
}

private static string HashPassword(string Password, byte[] salt)
{
  byte[] hash = new byte[PBKDF2SubkeyLength];
  using (var pbkdf2 = new Rfc2898DeriveBytes(Password, salt, PBKDF2IterCount))
  {
    hash = pbkdf2.GetBytes(PBKDF2SubkeyLength);
  }

  byte[] hashBytes = new byte[PBKDF2SubkeyLength + SaltSize];
  Array.Copy(salt, 0, hashBytes, 0, SaltSize);
  Array.Copy(hash, 0, hashBytes, SaltSize, PBKDF2SubkeyLength);

  string hashedPassword = Convert.ToBase64String(hashBytes);
  return hashedPassword;
}

控制台应用程序将生成以下内容:

The console app will produce the following:

--Salt--
5SyOX+Rbclzvvit3MEM2nA==
--HashedPassword--
5SyOX+Rbclzvvit3MEM2nBRaPVo2M7ZTs7n3znXTfyW4OhwTlJLvpcUlCryblgkQ
--IsValid--
True

但是在 PHP 方面我无法得到相同的结果.到目前为止，我的代码如下.

However in the PHP side I can't get the same results. My code so far is below.

$mySalt = base64_decode('5SyOX+Rbclzvvit3MEM2nA==');
$dev = pbkdf2('sha1', '#0zEZcD7uNmv', $mySalt, 10000, 48, true);
$key = substr($dev, 0, 32); //Keylength: 32
$iv = substr($dev, 32, 16); // IV-length: 16

echo 'PHP<br/>';
echo 'PASS: '.base64_encode($dev).'<br/>';
echo 'SALT: '.base64_encode($iv).'<br/><br/>'; 

echo '.NET<br/>';
echo 'PASS: 5SyOX+Rbclzvvit3MEM2nBRaPVo2M7ZTs7n3znXTfyW4OhwTlJLvpcUlCryblgkQ<br/>';
echo 'SALT: 5SyOX+Rbclzvvit3MEM2nA==<br/><br/>'; 

function pbkdf2($algorithm, $password, $salt, $count, $key_length, $raw_output = false)
{
    $algorithm = strtolower($algorithm);
    if(!in_array($algorithm, hash_algos(), true))
        die('PBKDF2 ERROR: Invalid hash algorithm.');
    if($count <= 0 || $key_length <= 0)
        die('PBKDF2 ERROR: Invalid parameters.');

    $hash_length = strlen(hash($algorithm, "", true));
    $block_count = ceil($key_length / $hash_length);

    $output = "";
    for($i = 1; $i <= $block_count; $i++) {
        // $i encoded as 4 bytes, big endian.
        $last = $salt . pack("N", $i);
        // first iteration
        $last = $xorsum = hash_hmac($algorithm, $last, $password, true);
        // perform the other $count - 1 iterations
        for ($j = 1; $j < $count; $j++) {
            $xorsum ^= ($last = hash_hmac($algorithm, $last, $password, true));
        }
        $output .= $xorsum;
    }
    return substr($output, 0, $key_length);
}

结果是:

PHP
PASS: FFo9WjYztlOzuffOddN/Jbg6HBOUku+lxSUKvJuWCRCsYe+1Tgbb8Ob4FtxumMal
SALT: rGHvtU4G2/Dm+BbcbpjGpQ==

.NET
PASS: 5SyOX+Rbclzvvit3MEM2nBRaPVo2M7ZTs7n3znXTfyW4OhwTlJLvpcUlCryblgkQ
SALT: 5SyOX+Rbclzvvit3MEM2nA==

任何帮助将不胜感激.

推荐答案

最终使用 https 使其工作://github.com/defuse/password-hashing 库，有一些细微的变化，与我正在导入的数据库中的哈希格式相匹配.

Ended up getting it working using the https://github.com/defuse/password-hashing libraries, with some minor changes match the format of hashes I was working with database I'm importing.

但我的主要问题是这些行，我试图从散列中获取密钥.

But my main problem was with these lines where I'm trying to get a key out of a hash.

$dev = pbkdf2('sha1', '#0zEZcD7uNmv', $mySalt, 10000, 48, true);
$key = substr($dev, 0, 32); //Keylength: 32
$iv = substr($dev, 32, 16); // IV-length: 16

将其更改为以下内容，以便它创建一个 32 位长的散列散列并将返回的散列加入盐中解决了该问题.

Changing it to the below, so that it is creating a hash hash that is 32 bits long and joining the returning hash to the salt fixed the issue.

$dev = pbkdf2('sha1', '#0zEZcD7uNmv', $mySalt, 10000, 32, true);
echo 'PASS: '.base64_encode($mySalt.$dev).'<br />';

下面的输出现在与 .NET 匹配:

With the output below now matching .NET:

PASS: 5SyOX+Rbclzvvit3MEM2nBRaPVo2M7ZTs7n3znXTfyW4OhwTlJLvpcUlCryblgkQ

这篇关于使用 Rfc2898DeriveBytes 将 C# PBKDF2 转换为 PHP的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！