private string SendData(string url, string productKey, Dictionary<string, string> dataParams, Dictionary<string, string> prvDataParams)
{
// private params put in xml format and encrypt
string prvData = null;
if (prvDataParams.Count > 0) {
prvData += "<data>";
foreach (string paramName in prvDataParams.Keys) {
prvData += "<" + paramName + ">" + prvDataParams[paramName] + "</" + paramName + ">";
}
prvData += "</data>";
EZRSA ezrsa_public = new EZRSA(1024);
ezrsa_public.FromXmlString(productKey);
string encrypted = "";
int chunkSize = 40;
for (int i = 0; i < prvData.Length / chunkSize; i++) {
byte[] encryptedBytes = ezrsa_public.Encrypt(Encoding.Unicode.GetBytes(prvData.Substring(i * chunkSize, chunkSize)), false);
// convert to hexa string
for (int j = 0; j < encryptedBytes.Length; ++j) {
encrypted += encryptedBytes[j].ToString("X2");
}
}
if (prvData.Length % chunkSize != 0) {
byte[] encryptedBytes = ezrsa_public.Encrypt(Encoding.Unicode.GetBytes(prvData.Substring(prvData.Length - prvData.Length % chunkSize)), false);
for (int j = 0; j < encryptedBytes.Length; ++j) {
encrypted += encryptedBytes[j].ToString("X2");
}
}
prvData = encrypted;
}
// fill post data (and include private data above)
string postData = "";
foreach (string paramName in dataParams.Keys) {
postData += paramName + "=" + dataParams[paramName] + "&";
}
if (prvData != null) {
postData += "prvdata=" + prvData;
}
if (postData[postData.Length - 1] == '&') postData = postData.Substring(0, postData.Length - 1);
System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
byte[] data = encoding.GetBytes(postData);
HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(url);
httpRequest.Method = "POST";
httpRequest.ContentType = "application/x-www-form-urlencoded";
httpRequest.ContentLength = data.Length;
httpRequest.Timeout = 20 * 1000;
System.IO.Stream newStream = httpRequest.GetRequestStream();
// Send the data.
newStream.Write(data, 0, data.Length);
newStream.Close();
HttpWebResponse response = (HttpWebResponse)httpRequest.GetResponse();
System.IO.StreamReader reader = new System.IO.StreamReader(response.GetResponseStream());
string responseText = reader.ReadToEnd();
response.Close();
return responseText.Trim();
}
public bool IsValid(string productCode, string versionCode)
{
//System.Diagnostics.Stopwatch timer = new System.Diagnostics.Stopwatch();
//timer.Start();
// always pass BaseProductVerions in activation code IsValid
if (RegCode == null || RegCode.IsExpired())
return false;
EZRSA ezrsa_public = new EZRSA(1024);
ezrsa_public.FromXmlString(ProductKey);
byte[] signatureBytes = new byte[128];
for (int i = 0; i < 128; i++) {
signatureBytes[i] = Convert.ToByte(ActivationCode.Substring(i * 2, 2), 16);
}
return ezrsa_public.VerifyData(Encoding.Unicode.GetBytes(Host + RegistrationCode + RegCode.R + productCode + versionCode), new SHA1CryptoServiceProvider(), signatureBytes);
}