So I have this c# application that needs to ping my web server thats running linux/php stack.
I am having problems with the c# way of base 64 encoding bytes.
my c# code is like:
byte[] encbuff = System.Text.Encoding.UTF8.GetBytes("the string");
String enc = Convert.ToBase64String(encbuff);
and php side:
$data = $_REQUEST['in'];
$raw = base64_decode($data);
with larger strings 100+ chars it fails. I think this is due to c# adding '+'s in the encoding but not sure. any clues
You should probably URL Encode your Base64 string on the C# side before you send it.
And URL Decode it on the php side prior to base64 decoding it.
C# side
byte[] encbuff = System.Text.Encoding.UTF8.GetBytes("the string");
string enc = Convert.ToBase64String(encbuff);
string urlenc = Server.UrlEncode(enc);
and php side:
$data = $_REQUEST['in'];
$decdata = urldecode($data);
$raw = base64_decode($decdata);
Note that + is a valid character in base64 encoding, but when used in URLs it is often translated back to a space. This space may be confusing your PHP base64_decode function.
You have two approaches to solving this problem:
The first option is probably your better choice.
This seems to work , replacing + with %2B...
private string HTTPPost(string URL, Dictionary<string, string> FormData)
{
UTF8Encoding UTF8encoding = new UTF8Encoding();
string postData = "";
foreach (KeyValuePair<String, String> entry in FormData)
{
postData += entry.Key + "=" + entry.Value + "&";
}
postData = postData.Remove(postData.Length - 1);
//urlencode replace (+) with (%2B) so it will not be changed to space ( )
postData = postData.Replace("+", "%2B");
byte[] data = UTF8encoding.GetBytes(postData);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;
Stream strm = request.GetRequestStream();
// Send the data.
strm.Write(data, 0, data.Length);
strm.Close();
WebResponse rsp = null;
// Send the data to the webserver
rsp = request.GetResponse();
StreamReader rspStream = new StreamReader(rsp.GetResponseStream());
string response = rspStream.ReadToEnd();
return response;
}
Convert.ToBase64String doesn't seem to add anything extra as far as I can see. For instance:
byte[] bytes = new byte[1000];
Console.WriteLine(Convert.ToBase64String(bytes));
The above code prints out a load of AAAAs with == at the end, which is correct.
My guess is that $data on the PHP side doesn't contain what enc did on the C# side - check them against each other.
in c#
this is a <B>long</b>string. and lets make this a3214 ad0-3214 0czcx 909340 zxci 0324#$@#$%%13244513123
turns into
dGhpcyBpcyBhIDxCPmxvbmc8L2I+c3RyaW5nLiBhbmQgbGV0cyBtYWtlIHRoaXMgYTMyMTQgYWQwLTMyMTQgMGN6Y3ggOTA5MzQwIHp4Y2kgMDMyNCMkQCMkJSUxMzI0NDUxMzEyMw==
for me. and i think that + is breaking it all.