I'm trying to convert the following code that create encryption key to c# the result I need the $key ** and ** $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);
what I could do until now
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);
but I'm not getting the same result
thanks
The called PHP md5
function will return the md5 hash in raw binary format (16 bytes). Read more about PHP md5 .
Here is the equivalent in .NET.
...
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();
...
If you want to check the outputs, use the PHP base64_encode function and the .NET Convert.ToBase64String , then compare the base64 strings.
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