Aes.Encrypt

Create an extension method as

public static Common
{
public static byte[] EncryptAES(this string, string str)
{
using(AesManaged aes = new AesManaged())
{
byte[] encrypted = Encrypt(str, aes.Key, aes.IV);
return encrypted;
}
return new byte[];
}
public static string DecryptAES(this byte[], byte arr)
{
using(AesManaged aes = new AesManaged())
{
string decrypted = Decrypt(arr, aes.Key, aes.IV);
return decrypted ;
}
return null;
}
}
static byte[] Encrypt(string plainText, byte[] Key, byte[] IV) {
byte[] encrypted;
// Create a new AesManaged.
using(AesManaged aes = new AesManaged()) {
// Create encryptor
ICryptoTransform encryptor = aes.CreateEncryptor(Key, IV);
// Create MemoryStream
using(MemoryStream ms = new MemoryStream()) {
// Create crypto stream using the CryptoStream class. This class is the key to encryption
// and encrypts and decrypts data from any given stream. In this case, we will pass a memory stream
// to encrypt
using(CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write)) {
// Create StreamWriter and write data to a stream
using(StreamWriter sw = new StreamWriter(cs))
sw.Write(plainText);
encrypted = ms.ToArray();
}
}
}
// Return encrypted data
return encrypted;
}
static string Decrypt(byte[] cipherText, byte[] Key, byte[] IV) {
string plaintext = null;
// Create AesManaged
using(AesManaged aes = new AesManaged()) {
// Create a decryptor
ICryptoTransform decryptor = aes.CreateDecryptor(Key, IV);
// Create the streams used for decryption.
using(MemoryStream ms = new MemoryStream(cipherText)) {
// Create crypto stream
using(CryptoStream cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read)) {
// Read crypto stream
using(StreamReader reader = new StreamReader(cs))
plaintext = reader.ReadToEnd();
}
}
}
return plaintext;
}

use it as

"lnkRating" PostBackUrl='<%# "~/Student?id=" + Convert.ToString(Eval("ID")).EncryptAES() +"&val="+ Convert.ToString(Eval("SID")).EncryptAES() %>' runat="server">Item

Note:- add using statement of your Extension method in the code behind of above aspx.

and in student.aspx.cs

void PageLoad()
{
var id=Request.QueryString["id"].DecryptAES();
var val=Request.QueryString["v al"].DecryptAES();
}

1 Reply

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Sachin Singh4y ago
Accepted answer
Create an extension method as
public static Common
{
public static byte[] EncryptAES(this string, string str)
{
using(AesManaged aes = new AesManaged())
{

byte[] encrypted = Encrypt(str, aes.Key, aes.IV);
return encrypted;
}
return new byte[];
}

public static string DecryptAES(this byte[], byte arr)
{
using(AesManaged aes = new AesManaged())
{

string decrypted = Decrypt(arr, aes.Key, aes.IV);
return decrypted ;

}
return null;
}

}

static byte[] Encrypt(string plainText, byte[] Key, byte[] IV) {
byte[] encrypted;
// Create a new AesManaged.
using(AesManaged aes = new AesManaged()) {
// Create encryptor
ICryptoTransform encryptor = aes.CreateEncryptor(Key, IV);
// Create MemoryStream
using(MemoryStream ms = new MemoryStream()) {
// Create crypto stream using the CryptoStream class. This class is the key to encryption
// and encrypts and decrypts data from any given stream. In this case, we will pass a memory stream
// to encrypt
using(CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write)) {
// Create StreamWriter and write data to a stream
using(StreamWriter sw = new StreamWriter(cs))
sw.Write(plainText);
encrypted = ms.ToArray();
}
}
}
// Return encrypted data
return encrypted;
}
static string Decrypt(byte[] cipherText, byte[] Key, byte[] IV) {
string plaintext = null;
// Create AesManaged
using(AesManaged aes = new AesManaged()) {
// Create a decryptor
ICryptoTransform decryptor = aes.CreateDecryptor(Key, IV);
// Create the streams used for decryption.
using(MemoryStream ms = new MemoryStream(cipherText)) {
// Create crypto stream
using(CryptoStream cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read)) {
// Read crypto stream
using(StreamReader reader = new StreamReader(cs))
plaintext = reader.ReadToEnd();
}
}
}
return plaintext;
}
use it as
"lnkRating" PostBackUrl='<%# "~/Student?id=" + Convert.ToString(Eval("ID")).EncryptAES() +"&val="+ Convert.ToString(Eval("SID")).EncryptAES() %>' runat="server">Item
Note:- add using statement of your Extension method in the code behind of above aspx.
and in student.aspx.cs
void PageLoad()
{
var id=Request.QueryString["id"].DecryptAES();
var val=Request.QueryString["v al"].DecryptAES();
}