Basically, I'm building a small tracker for experimental purposes. I've gotten quite far, and am now working on the announce part.
What I really can't figure out is how I should decode the info_hash query string provided.
From the specification, it is a urlencoded 20-byte SHA1 hash, which made me write this code,
byte[] foo = Encoding.Default.GetBytes(HttpUtility.UrlDecode(infoHash));
string temp = "";
foreach (byte b in foo)
{
temp += b.ToString("X");
}
Which gives 'temp' the following value,
5D3F3F3F3F5E3F3F3F153FE4033683F55693468
The first and last few characters are correct. This is the raw info_hash,
%5d%96%b6%f6%84%5e%ea%da%c5%15%c4%0e%403h%b9Ui4h
And this is what both uTorrent and my own tracker gives me as info_hash when generating it from the torrent file,
5D96B6F6845EEADAC515C40E403368B955693468
What am I doing wrong?