Implement ASP. NET data encryption using symmetric encryption algorithms

How does symmetric encryption algorithm implement ASP. NET data encryption? The following is a detailed description:

The following is the code for implementing ASP. NET data encryption in C # of symmetric encryption algorithm. You can change different algorithms as needed. The Rijndael algorithm is used as an example in this article:

 
 

  
  
 
  
  
UsingSystem;
  
  
UsingSystem. IO;
  
  
UsingSystem. Security. Cryptography;
  
  
UsingSystem. Text;
  
  
 
  
  
NamespaceDataCrypto
  
  
{
  
  
/// <Summary> 
  
  
/// ASP. NET symmetric encryption algorithm 
  
  
/// </Summary> 
  
  
Public ClassSymmetricMethod
  
  
{
  
  
 
  
  
PrivateSymmetricAlgorithm mobjCryptoService;
  
  
Private StringKey;
  
  
/// <Summary> 
  
  
/// ASP. NET constructor for symmetric encryption 
  
  
/// </Summary> 
  
  
PublicSymmetricMethod ()
  
  
{
  
  
MobjCryptoService =NewRijndaelManaged ();
  
  
Key ="Guz (% & hj7x89H $ yuBI0456FtmaT5 & fvHUFCy76 * h % (HilJ $ lhj! Y6 & (* jkP87jH7";
  
  
}
  
  
/// <Summary> 
  
  
/// Accesskey for ASP. NET Data Encryption 
  
  
/// </Summary> 
  
  
/// <Returns> key </returns> 
  
  
Private Byte[] GetLegalKey ()
  
  
{
  
  
StringSTemp = Key;
  
  
MobjCryptoService. GenerateKey ();
  
  
Byte[] BytTemp = mobjCryptoService. Key;
  
  
IntKeyLength = bytTemp. Length;
  
  
If(STemp. Length> KeyLength)
  
  
STemp = sTemp. Substring (0, KeyLength );
  
  
Else If(STemp. Length <KeyLength)
  
  
STemp = sTemp. PadRight (KeyLength,'');
  
  
ReturnASCIIEncoding. ASCII. GetBytes (sTemp );
  
  
}
  
  
/// <Summary> 
  
  
/// ASP. NET data encryption to obtain the initial vector IV 
  
  
/// </Summary> 
  
  
/// <Returns> initial test vector IV </returns> 
  
  
Private Byte[] GetLegalIV ()
  
  
{
  
  
StringSTemp ="E4ghj * Ghg7! RNIfb & 95GUY86GfghUb # er57HBh (u % g6HJ ($ jhWk7 &! Hg4ui % $ hjk";
  
  
MobjCryptoService. GenerateIV ();
  
  
Byte[] BytTemp = mobjCryptoService. IV;
  
  
IntIVLength = bytTemp. Length;
  
  
If(STemp. Length> IVLength)
  
  
STemp = sTemp. Substring (0, IVLength );
  
  
Else If(STemp. Length <IVLength)
  
  
STemp = sTemp. PadRight (IVLength,'');
  
  
ReturnASCIIEncoding. ASCII. GetBytes (sTemp );
  
  
}
  
  
/// <Summary> 
  
  
/// ASP. NET Data Encryption Method 
  
  
/// </Summary> 
  
  
/// <Param name = "Source"> string to be encrypted </param> 
  
  
/// <Returns> encrypted string </returns> 
  
  
Public StringEncrypto (StringSource)
  
  
{
  
  
Byte[] BytIn = UTF8Encoding. UTF8.GetBytes (Source );
  
  
MemoryStream MS =NewMemoryStream ();
  
  
MobjCryptoService. Key = GetLegalKey ();
  
  
MobjCryptoService. IV = GetLegalIV ();
  
  
ICryptoTransform encrypto = mobjCryptoService. CreateEncryptor ();
  
  
CryptoStream cs =NewCryptoStream (MS, encrypto, CryptoStreamMode. Write );
  
  
Cs. Write (bytIn, 0, bytIn. Length );
  
  
Cs. FlushFinalBlock ();
  
  
Ms. Close ();
  
  
Byte[] BytOut = ms. ToArray ();
  
  
ReturnConvert. ToBase64String (bytOut );
  
  
}
  
  
/// <Summary> 
  
  
/// ASP. NET data encryption and decryption method 
  
  
/// </Summary> 
  
  
/// <Param name = "Source"> string to be decrypted </param> 
  
  
/// <Returns> decrypted string </returns> 
  
  
Public StringDecrypto (StringSource)
  
  
{
  
  
Byte[] BytIn = Convert. FromBase64String (Source );
  
  
MemoryStream MS =NewMemoryStream (bytIn, 0, bytIn. Length );
  
  
MobjCryptoService. Key = GetLegalKey ();
  
  
MobjCryptoService. IV = GetLegalIV ();
  
  
ICryptoTransform encrypto = mobjCryptoService. CreateDecryptor ();
  
  
CryptoStream cs =NewCryptoStream (MS, encrypto, CryptoStreamMode. Read );
  
  
StreamReader sr =NewStreamReader (cs );
  
  
ReturnSr. ReadToEnd ();
  
  
}
  
  
}
  
  
}
 
 

This section describes how to implement ASP. NET Data Encryption By Using symmetric encryption algorithms.

1. Analysis of ASP. NET data cache mechanism
2. Introduction to data caching in ASP. NET data cache
3. Implementation of ASP. NET data collection
4. Use of SqlHelperSqlHelper in ASP. NET data access layer
5. Hash Algorithm for ASP. NET Data Encryption