SteamKit2.CDNClient.PrepareAuthHeader C# (CSharp) Method

        private void PrepareAuthHeader(ref WebClient client, Uri uri)
        {
            reqcounter++;

            byte[] sha_hash;

            BinaryWriterEx bb = new BinaryWriterEx();

            bb.Write( sessionID );
            bb.Write( reqcounter );
            bb.Write( sessionKey );
            bb.Write( Encoding.ASCII.GetBytes( uri.AbsolutePath ) );

            sha_hash = CryptoHelper.SHAHash(bb.ToArray());

            string hex_hash = Utils.EncodeHexString(sha_hash);

            string authheader = String.Format("sessionid={0};req-counter={1};hash={2};", sessionID, reqcounter, hex_hash);

            webClient.Headers.Clear();
            webClient.Headers.Add("x-steam-auth", authheader);
        }