public static string DecodeString(string value, string key = staticKey)
{
String dataValue = "";
String calcHash = "";
String storedHash = "";
System.Security.Cryptography.MACTripleDES mac3des = new System.Security.Cryptography.MACTripleDES();
System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
mac3des.Key = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(key));
try
{
dataValue = System.Text.Encoding.UTF8.GetString(System.Convert.FromBase64String(value.Split(System.Convert.ToChar("-"))[0]));
storedHash = System.Text.Encoding.UTF8.GetString(System.Convert.FromBase64String(value.Split(System.Convert.ToChar("-"))[1]));
calcHash = System.Text.Encoding.UTF8.GetString(mac3des.ComputeHash(System.Text.Encoding.UTF8.GetBytes(dataValue)));
if (storedHash != calcHash)
{
//Data was corrupted
throw new ArgumentException("Hash value does not match");
}
}
catch (System.Exception)
{
throw new ArgumentException("Invalid String");
}
return(dataValue);
}
/// <summary>
/// The tamper proof string encode.
/// </summary>
/// <param name="strValue">The string value.</param>
/// <param name="strKey">The string key.</param>
/// <returns>The <see cref="string" />.</returns>
private static string TamperProofStringEncode(string strValue, string strKey)
{
System.Security.Cryptography.MACTripleDES mac3Des = new System.Security.Cryptography.MACTripleDES();
System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
mac3Des.Key = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(strKey));
return(Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(strValue)) + Convert.ToChar("-") + Convert.ToBase64String(mac3Des.ComputeHash(System.Text.Encoding.UTF8.GetBytes(strValue))));
}
/// <summary>
/// The tamper proof string decode.
/// </summary>
/// <param name="strValue">The string value.</param>
/// <param name="strKey">The string key.</param>
/// <returns>The <see cref="string" />.</returns>
/// <exception cref="ArgumentException">exception Argument Exception</exception>
private static string TamperProofStringDecode(string strValue, string strKey)
{
string strDataValue;
strValue = strValue.Trim();
strValue = strValue.Replace(" ", "+");
System.Security.Cryptography.MACTripleDES mac3Des = new System.Security.Cryptography.MACTripleDES();
System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
mac3Des.Key = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(strKey));
try
{
strDataValue = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(strValue.Split(Convert.ToChar("-"))[0]));
var strCalcHash = System.Text.Encoding.UTF8.GetString(mac3Des.ComputeHash(System.Text.Encoding.UTF8.GetBytes(strDataValue)));
Console.Write(strCalcHash);
}
catch (Exception)
{
return(strValue);
}
return(strDataValue);
}
public string TamperProofStringDecode(string value, string key)
{
string dataValue = "";
string calcHash = "";
string storedHash = "";
System.Security.Cryptography.MACTripleDES mac3des = new System.Security.Cryptography.MACTripleDES();
System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
mac3des.Key = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(key));
try
{
dataValue = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(value.Split('-')[0]));
storedHash = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(value.Split('-')[1]));
calcHash = System.Text.Encoding.UTF8.GetString(mac3des.ComputeHash(System.Text.Encoding.UTF8.GetBytes(dataValue)));
if ((storedHash != calcHash))
{
throw new ArgumentException("Hash value does not match");
// This error is immediately caught below
}
}
catch (Exception ex)
{
throw new ArgumentException("Invalid TamperProofString");
}
return(dataValue);
}
public string TamperProofStringEncode(string value, string key)
{
System.Security.Cryptography.MACTripleDES mac3des = new System.Security.Cryptography.MACTripleDES();
System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
mac3des.Key = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(key));
return(Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(value)) + "-" + Convert.ToBase64String(mac3des.ComputeHash(System.Text.Encoding.UTF8.GetBytes(value))));
}
//Function to decode the string
//Throws an exception if the data is corrupt
static public string DesCodificar(string value, string key)
{
String dataValue = "";
String calcHash = "";
String storedHash = "";
System.Security.Cryptography.MACTripleDES mac3des = new System.Security.Cryptography.MACTripleDES();
System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
mac3des.Key = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(key));
try
{
dataValue = System.Text.Encoding.UTF8.GetString(System.Convert.FromBase64String(value.Split(System.Convert.ToChar("-"))[0]));
storedHash = System.Text.Encoding.UTF8.GetString(System.Convert.FromBase64String(value.Split(System.Convert.ToChar("-"))[1]));
calcHash = System.Text.Encoding.UTF8.GetString(mac3des.ComputeHash(System.Text.Encoding.UTF8.GetBytes(dataValue)));
if (storedHash != calcHash)
{
//Data was corrupted
throw new ArgumentException("N");
//This error is immediately caught below
}
}
catch (System.Exception)
{
throw new ArgumentException("Codigo invalido");
}
return(dataValue);
}
//Function to encode the string
static public string Codificar(string value, string key)
{
System.Security.Cryptography.MACTripleDES mac3des = new System.Security.Cryptography.MACTripleDES();
System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
mac3des.Key = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(key));
return(System.Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(value)) +
System.Convert.ToChar("-") + System.Convert.ToBase64String(mac3des.ComputeHash(System.Text.Encoding.UTF8.GetBytes(value))));
}
private string decrypt(string value, string key)
{
string dataValue = "";
string calcHash = "";
string storedHash = "";
System.Security.Cryptography.MACTripleDES mac3des = new System.Security.Cryptography.MACTripleDES();
System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
mac3des.Key = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(key));
try
{
dataValue = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(value.Split('-')[0]));
storedHash = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(value.Split('-')[1]));
calcHash = System.Text.Encoding.UTF8.GetString(mac3des.ComputeHash(System.Text.Encoding.UTF8.GetBytes(dataValue)));
return(dataValue);
}
catch (Exception ex)
{
ex.ToString();
}
return(dataValue);
}
public static string TamperProofStringDecode(string value1)
{
string key = "0920";
string dataValue = "";
string calcHash = "";
string storedHash = "";
//value1 = value1.Replace('¿', '+');
value1 = HttpUtility.UrlDecode(value1);
value1 = value1.Replace(' ', '+');
System.Security.Cryptography.MACTripleDES mac3des = new System.Security.Cryptography.MACTripleDES();
System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
mac3des.Key = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(key));
try
{
dataValue = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(value1.Split('-')[0]));
storedHash = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(value1.Split('-')[1]));
calcHash = System.Text.Encoding.UTF8.GetString(mac3des.ComputeHash(System.Text.Encoding.UTF8.GetBytes(dataValue)));
if (storedHash != calcHash)
{
//Data was corrupted
return("");
// throw new ArgumentException("Hash value does not match");
}
//This error is immediately caught below
}
catch (Exception ex)
{
return("");
//throw new ArgumentException("Invalid TamperProofString");
}
return(dataValue);
}
/// <summary>
/// The tamper proof string decode.
/// </summary>
/// <param name="strValue">
/// The string value.
/// </param>
/// <param name="strKey">
/// The string key.
/// </param>
/// <returns>
/// The <see cref="string"/>.
/// </returns>
/// <exception cref="ArgumentException">
/// exception Argument Exception
/// </exception>
public static string TamperProofStringDecode(string strValue, string strKey)
{
String strDataValue;
String strCalcHash = "";
strValue = strValue.Trim();
strValue = strValue.Replace(" ", "+");
System.Security.Cryptography.MACTripleDES mac3Des = new System.Security.Cryptography.MACTripleDES();
System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
mac3Des.Key = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(strKey));
try
{
strDataValue = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(strValue.Split(Convert.ToChar("-"))[0]));
strCalcHash = System.Text.Encoding.UTF8.GetString(mac3Des.ComputeHash(System.Text.Encoding.UTF8.GetBytes(strDataValue)));
}
catch (Exception)
{
//throw new ArgumentException("Invalid TamperProofString. " + ex.Message);
return(strValue);
}
return(strDataValue);
}
