I am trying to implement Digest-MD5 auth (smtp/imap ver, rfc 2831
http://www.faqs.org/rfcs/rfc2831.html). I have a working example of
this in php (which I gleamed form the Pear project), I'm trying to
port this to c#, this is where I am beginning to run into problems.
In PHP I recieve the expected results, but in C# I do not. I believe
that this might be an encoding problem (The text being hashed should
be in ascii, and I believed that I accounted for that but I think it
might be helpful to have a few extra pair of eyes looking at the
code, maybe telling me what I have done wronge.
The working PHP code
<?php
$authcid = "chris";
$realm = "elwood.innosoft.com";
$pass = "secret";
$nonce = "OA6MG9tEQGm2hh";
$cnonce = "OA6MHXh6VqTrRk";
$digest_uri = "imap/elwood.innosoft.com";
$A1 = sprintf('%s:%s:%s', pack('H32',
md5(sprintf('%s:%s:%s', $authcid, $realm,
$pass))), $nonce, $cnonce);
$A2 = 'AUTHENTICATE:' . $digest_uri;
print(md5(sprintf('%s:%s:00000001:%s:auth:%s',
md5($A1), $nonce, $cnonce, md5($A2))));
printf("<BR>d388dad90d4bbd760a152321f2143af7");
##Correct Response
?>
And now the c# code segment
[code:1:888bd25bbc]private void DigestMD5Test_Click(object sender,
System.EventArgs e)
{
string authcid = "chris";
string realm = "elwood.innosoft.com";
string pass = "secret";
string nonce = "OA6MG9tEQGm2hh";
string cnonce = "OA6MHXh6VqTrRk";
string digest_uri = "imap/elwood.innosoft.com";
string A1 =
String.Format("{0}:{1}:{2}",
MD5(string.Format("{0}:{1}:{2}",
authcid, realm, pass)), nonce, cnonce);
string A2 = "AUTHENTICATE:" + digest_uri;
System.Console.WriteLine(MD5(String.Format("{0}:{1 }:00000001:{2}:auth:{3}",
MD5(A1), nonce, cnonce, MD5(A2))));
System.Console.WriteLine("d388dad90d4bbd760a152321 f2143af7");
//Correct Response
}
public static string MD5(string password)
{
ASCIIEncoding UE = new ASCIIEncoding();
byte[] textBytes = UE.GetBytes(password);
try
{
System.Security.Cryptography.MD5CryptoServiceProvi der
cryptHandler;
cryptHandler = new
System.Security.Cryptography.MD5CryptoServiceProvi der();
byte[] hash = cryptHandler.ComputeHash
(textBytes);
StringBuilder sb = new StringBuilder(hash.Length *
2);
foreach(byte b in hash)
{
sb.Append(String.Format("{0:x2}",
b));
}
return sb.ToString().ToLower();
}
catch
{
throw;
}
}[/code:1:888bd25bbc]
Thanks
Timothy
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