This following code will be useful to encrypt or decrypt the string values while passing data on querystrings or want to save the data databse in encrypted format.
//Declare constant for encryption.
public static string KEY = "K6u8#m2a";
//use the following namespace
using System.Security.Cryptography;
//Function to Encrypt the string value.
public static string EncryptString(string stringToEncrypt)
{
byte[] key = { };
byte[] IV = { 0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78 };
try
{
key = Encoding.UTF8.GetBytes(KEY);
DESCryptoServiceProvider desProvidr = new
DESCryptoServiceProvider();
byte[] inputByteArray = Encoding.UTF8.GetBytes(stringToEncrypt);
MemoryStream ms = new MemoryStream();
CryptoStream csstreamdata = new CryptoStream(ms,
desProvidr .CreateEncryptor(key, IV), CryptoStreamMode.Write);
csstreamdata .Write(inputByteArray, 0, inputByteArray.Length);
csstreamdata .FlushFinalBlock();
return Convert.ToBase64String(ms.ToArray());
}
catch (Exception ex)
{
throw ex;
}
}
//To decrypt the Encrypted value use this function
public static string DecryptString(string stringToDecrypt)
{
byte[] key = { };
byte[] IV = { 0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78 };
stringToDecrypt = stringToDecrypt.Replace(" ", "+");
byte[] inputByteArray = new byte[stringToDecrypt.Length];
try
{
key = Encoding.UTF8.GetBytes(KEY);
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
inputByteArray = Convert.FromBase64String(stringToDecrypt);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(key, IV), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
Encoding encoding = Encoding.UTF8;
return encoding.GetString(ms.ToArray());
}
catch (Exception ex)
{
throw ex;
}
}
//If you want to pass query string in encrypted format use the following.
response.redirect("welcome.aspx?ID="+EncryptString(value));
//To decrypt the value from query string
string ID=DecryptString(Request.QueryString["Id"].ToString());
Same way you can sent encrypted data to store in database also.
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