public string ToQueryString()
{
StringBuilder sb = new StringBuilder();
sb.AppendFormat("AppId:{0}", this.AppId).AppendLine()
.AppendFormat("MAC:{0}", this.MAC).AppendLine()
.AppendFormat("CN:{0}", this.ComputerName).AppendLine()
.AppendFormat("AppVersion:{0}", this.AppVersion).AppendLine()
.AppendFormat("RuntimeVersion:{0}", this.RuntimeVersion).AppendLine()
.AppendFormat("CDSN:{0}", this.CDriveSerialNumber).AppendLine()
.AppendFormat("CPU:{0}", this.CPUNumber).AppendLine()
.AppendFormat("SN:{0}", SN);
string s = sb.ToString();
RSAPublicKey rsaPublic = RSAPublicKey.FromXmlString(AppHelper.STR_PUBLIC_KEY);
Byte[] bs = RSAHelper.Encrypt(Encoding.UTF8.GetBytes(s), rsaPublic);
var result = Convert.ToBase64String(bs);
#if DEBUG
Debug.WriteLine("Encrypted and encoded with base64:" + result);
var bs2 = Convert.FromBase64String(result);
var decryptedBytes = RSAHelper.Decrypt(bs2, RSAPrivateKey.FromXmlString(AppHelper.STR_PRIVATE_KEY));
var original = Encoding.UTF8.GetString(decryptedBytes);
if (original != s)
{
throw new Exception("failed to decrypt");
}
#endif
return(result);
}
/// <summary>
/// this method is used when client cannot connect to the internet or service is broken.
/// </summary>
/// <returns></returns>
public bool SNVerifyLocally()
{
if (string.IsNullOrEmpty(this.SN))
{
return(false);
}
try
{
RSAPublicKey rsaPublic = RSAPublicKey.FromXmlString(AppHelper.STR_PUBLIC_KEY);
byte[] decryptBytes = RSAHelper.Decrypt(Convert.FromBase64String(this.SN), rsaPublic);
string resultDecrypted = Encoding.UTF8.GetString(decryptBytes, 0, decryptBytes.Length);
string[] sns = resultDecrypted.Split(new char[] { '|' }, 3);
if (sns.Length == 2 || sns.Length == 3)
{
var localHash = sns[1];
var tmp = string.Format("{0}-{1}-{2}", this.AppId.Substring(0, 8), this.MAC, sns[0]).ToLower();
var data = (new EncDec()).GetMd5Hash(tmp);
if (data.ToLower() == localHash.ToLower())
{
if (sns.Length == 3)
{
DateTime expireDate = DateTime.Parse(sns[2]);
if (DateTime.Now > expireDate)
{
return(false);
}
}
return(true);
}
else
{
//the SN value might be modified by client user manually.
//Just keep the value that user modified.
return(false);
}
}
}
catch (Exception)
{
return(false);
}
return(false);
}
