将创建加密密钥的 PHP 代码转换为 c# MD5

Question

我正在尝试将以下创建加密密钥的代码转换为 C# 结果我需要 $key ** 和 ** $iv

$passphrase = 'asdfghjkl';
$salt =  '123456789' // for test purposes I fixed the value but it should be openssl_random_pseudo_bytes(8);
        $salted = '';
        $dx = '';
        while (strlen($salted) < 48) {
            $dx = md5($dx . $passphrase . $salt, true);
            $salted .= $dx;
        }
        $key = substr($salted, 0, 32);
        $iv = substr($salted, 32, 16);

到目前为止我能做什么

string passphrase = "asdfghjkl";
string salt = "123456789";
string key, iv;

byte[] salted = new byte[0];
byte[] dx = new byte[0];

while (salted.Length < 48)
      {
        string a = passphrase + salt;
        byte[] b = Encoding.UTF8.GetBytes(a);

        byte[] rv = new byte[dx.Length + b.Length];
        System.Buffer.BlockCopy(dx, 0, rv, 0, dx.Length);
        System.Buffer.BlockCopy(b, 0, rv, dx.Length, b.Length);

        //dx = MD5CryptoServiceProvider.Create().ComputeHash(rv);
        using (MD5 md5 = MD5.Create())
              {
                dx = md5.ComputeHash(rv);
              }

        byte[] rx = new byte[salted.Length + dx.Length];
        System.Buffer.BlockCopy(salted, 0, rx, 0, salted.Length);
        System.Buffer.BlockCopy(dx, 0, rx, salted.Length, dx.Length);

        salted = rx;
      }
string utfString1 = Encoding.UTF8.GetString(salted);
key = utfString1.Substring( 0, 32);
iv = utfString1.Substring(32, 16);

但我没有得到相同的结果

谢谢

Answer 1

调用的 PHP md5 函数将 return 原始二进制格式（16 字节）的 md5 散列。详细了解 PHP md5。

这是 .NET 中的等价物。

...
var passphrase = Encoding.UTF8.GetBytes("asdfghjkl");
var salt = Encoding.UTF8.GetBytes("123456789");
var salted = new List<byte>();
var dx = new byte[0];
using (var md5 = MD5.Create())
{
    do
    {
        var bytesToHash = dx.Concat(passphrase).Concat(salt);
        dx = md5.ComputeHash(bytesToHash.ToArray());
        salted.AddRange(dx);
    } while (salted.Count < 48);
}

var key = salted.Take(32).ToArray();
var iv = salted.Skip(32).Take(16).ToArray();
...

如果要检查输出，请使用 PHP base64_encode function and the .NET Convert.ToBase64String，然后比较 base64 字符串。

将创建加密密钥的 PHP 代码转换为 c# MD5

Convert PHP code that create encryption key to c# MD5

php

c#

encryption

byte

md5