Data encryption with C # (i)--Symmetric encryption algorithm

Encryption | data | algorithm using C # Data encryption (i)--Symmetric encryption algorithm



The following is about the symmetric encryption algorithm of C # implementation code, you can change the different algorithm according to the need, the article takes Rijndael algorithm for example:

Using System;
Using System.IO;
Using System.Security.Cryptography;
Using System.Text;

Namespace Datacrypto
{
<summary>
Symmetric encryption Algorithm Class
</summary>
public class Symmetricmethod
{

Private SymmetricAlgorithm Mobjcryptoservice;
private string Key;
<summary>
Constructors for symmetric cryptographic classes
</summary>
Public Symmetricmethod ()
{
Mobjcryptoservice = new RijndaelManaged ();
Key = "Guz" (%&hj7x89h$yubi0456ftmat5&fvhufcy76*h% (hilj$lhj!y6&) (*JKP87JH7;
}
<summary>
Get key
</summary>
<returns> Key </returns>
Private byte[] Getlegalkey ()
{
String stemp = Key;
Mobjcryptoservice.generatekey ();
byte[] Byttemp = Mobjcryptoservice.key;
int keylength = Byttemp.length;
if (Stemp.length > Keylength)
stemp = stemp.substring (0, keylength);
else if (Stemp.length < keylength)
Stemp = Stemp.padright (Keylength, ");
Return ASCIIEncoding.ASCII.GetBytes (stemp);
}
<summary>
Get the initial vector IV
</summary>
<returns> Preliminary Vector iv</returns>
Private byte[] Getlegaliv ()
{
String stemp = "E4ghj*ghg7!rnifb&95guy86gfghub#er57hbh (u%g6hj ($jhWk 7&!hg4ui% $HJK";
Mobjcryptoservice.generateiv ();
byte[] Byttemp = MOBJCRYPTOSERVICE.IV;
int ivlength = Byttemp.length;
if (Stemp.length > Ivlength)
stemp = stemp.substring (0, ivlength);
else if (Stemp.length < ivlength)
Stemp = Stemp.padright (Ivlength, ");
Return ASCIIEncoding.ASCII.GetBytes (stemp);
}
<summary>
Encryption method
</summary>
<param name= "Source" > Strings to be encrypted </param>
<returns> Encrypted String </returns>
public string Encrypto (string Source)
{
byte[] Bytin = UTF8Encoding.UTF8.GetBytes (Source);
MemoryStream ms = new MemoryStream ();
Mobjcryptoservice.key = Getlegalkey ();
MOBJCRYPTOSERVICE.IV = Getlegaliv ();
ICryptoTransform encrypto = Mobjcryptoservice.createencryptor ();
CryptoStream cs = new CryptoStream (MS, Encrypto, CryptoStreamMode.Write);
Cs. Write (bytin, 0, bytin.length);
Cs. FlushFinalBlock ();
Ms. Close ();
Byte[] Bytout = Ms. ToArray ();
Return convert.tobase64string (bytout);
}
<summary>
Decryption method
</summary>
<param name= "Source" > String to be decrypted </param>
<returns> decrypted String </returns>
public string Decrypto (string Source)
{
byte[] Bytin = convert.frombase64string (Source);
MemoryStream ms = new MemoryStream (bytin, 0, bytin.length);
Mobjcryptoservice.key = Getlegalkey ();
MOBJCRYPTOSERVICE.IV = Getlegaliv ();
ICryptoTransform encrypto = Mobjcryptoservice.createdecryptor ();
CryptoStream cs = new CryptoStream (MS, Encrypto, CryptoStreamMode.Read);
StreamReader sr = new StreamReader (CS);
return Sr. ReadToEnd ();
}
}
}