使用 Rfc2898DeriveBytes 将 C# PBKDF2 转换为 PHP

长话短说，我们在 .NET 中内置了一个会员系统，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。

使用已知的散列密码，我可以使用以下代码轻松在 .NET 中复制此内容：

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：

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

然而在 PHP 方面我无法得到相同的结果。到目前为止我的代码如下。

$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。

最终使用https://github.com/defuse/password-hashing https://github.com/defuse/password-hashing库，进行了一些细微的更改，与我正在导入的数据库中使用的哈希格式相匹配。

但我的主要问题是这些行，我试图从哈希中获取密钥。

$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，以便创建一个 32 位长的哈希值，并将返回的哈希值加入到 salt 中，从而解决了该问题。

$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：

PASS: 5SyOX+Rbclzvvit3MEM2nBRaPVo2M7ZTs7n3znXTfyW4OhwTlJLvpcUlCryblgkQ