C # strings using keys to add and decrypt _c# tutorial

The first to share is a C # string that uses a key to encrypt and decrypt the code, which reads as follows

public class Desencrypt {///<summary>///algorithm offset///</summary> const string M_iv = "12345
 
    678 "; <summary>///Function Description: Generate 8-bit key based on key input///Author: Love to template network 2gei.cn///Date created: 2015-07-20 17:25:26///</s  ummary>///<param name= "strkey" >strkey</param>///<returns>8 bit key </returns> private static string Getkey (String strkey) {if (string).
      IsNullOrEmpty (strkey)) {strkey = "infocoll"; } if (strkey.
      Length% 8 = 0) {return strkey;
      else {return Getkey (strkey + "0"); }///<summary>///feature Description: Encrypted string///Author: Love to template network 2gei.cn///Date created: 2015-07-20 17:18:31/// Task number:///</summary>///<param name= "strsourcestring" > Original string </param>///<param name= "strk EY "> Key </param>///<returns> encrypted string </returns> public static string Encrypt (String STRsOurcestring, String strkey) {strkey = Getkey (strkey);
 
      byte[] Btkey = Encoding.UTF8.GetBytes (strkey);
 
      byte[] Btiv = Encoding.UTF8.GetBytes (M_IV);
 
      DESCryptoServiceProvider des = new DESCryptoServiceProvider (); using (MemoryStream ms = new MemoryStream ()) {try {byte[] Indata = Encoding.UTF8.GetByte
          S (strsourcestring); using (CryptoStream cs = new CryptoStream (MS, Des.) CreateEncryptor (Btkey, Btiv), CryptoStreamMode.Write)) {cs.
 
            Write (indata, 0, indata.length); Cs.
          FlushFinalBlock (); Return convert.tobase64string (Ms.
        ToArray ());
        catch {return strsourcestring;
    ///<summary>///Feature Description: Decryption string///Author: Love to template network 2gei.cn///Date created: 2015-07-20 17:18:49  Task number:///</summary>///<param name= "strencryptedstring" > Original string </param>///<param Name= "StRkey "> Key </param>///<returns> decrypted string </returns> public static string Decrypt (String Strencryp
      Tedstring, String strkey) {strkey = Getkey (strkey);
 
      byte[] Btkey = Encoding.UTF8.GetBytes (strkey);
 
      byte[] Btiv = Encoding.UTF8.GetBytes (M_IV);
 
      DESCryptoServiceProvider des = new DESCryptoServiceProvider (); using (MemoryStream ms = new MemoryStream ()) {try {byte[] Indata = convert.frombase64str
          ING (strencryptedstring); using (CryptoStream cs = new CryptoStream (MS, Des.) CreateDecryptor (Btkey, Btiv), CryptoStreamMode.Write)) {cs.
 
            Write (indata, 0, indata.length); Cs.
          FlushFinalBlock (); Return Encoding.UTF8.GetString (Ms.
        ToArray ());
        catch {return strencryptedstring;

 }
      }
    }
  }

C # string encryption and decryption

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

    Default key vector private static byte[] keys = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF}; <summary>///des cryptographic strings///</summary>///<param name= "encryptstring" > Strings to be encrypted </param&
    Gt <param name= "Encryptkey" > Encryption key, required for 8-bit </param>///<returns> encryption to successfully return the encrypted string, failed to return the source string </returns > public static string Encryptdes (String encryptstring, String encryptkey) {try {byte[] R
        Gbkey = Encoding.UTF8.GetBytes (encryptkey.substring (0, 8));//Convert to byte byte[] Rgbiv = Keys;
        byte[] Inputbytearray = Encoding.UTF8.GetBytes (encryptstring); DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider ()//materialized Data Encryption Standard MemoryStream Mstream = new MemoryStream ();//materialized memory stream//stream CryptoStream cstream = new CryptoStream (Mstream, Dcsp.createencryptor (Rgbkey,
        RGBIV), cryptostreammode.write); Cstream.write (inputByteArray, 0, inputbytearray.length);
        Cstream.flushfinalblock ();
      Return convert.tobase64string (Mstream.toarray ());
      catch {return encryptstring; }///<summary>///des decryption string///</summary>///<param name= "decryptstring" > Words to be decrypted String </param>///<param name= "Decryptkey" > Decryption key, required for 8-bit, and the same encryption key </param>///<returns> decryption successfully returned the decrypted
      String, failed back source string </returns> public static string Decryptdes (String decryptstring, String decryptkey) {try
        {byte[] Rgbkey = Encoding.UTF8.GetBytes (Decryptkey);
        byte[] Rgbiv = Keys;
        byte[] Inputbytearray = convert.frombase64string (decryptstring);
        DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider ();
        MemoryStream mstream = new MemoryStream (); CryptoStream cstream = new CryptoStream (Mstream, DCSP.
        CreateDecryptor (Rgbkey, Rgbiv), cryptostreammode.write); Cstream.write (inputbytEarray, 0, inputbytearray.length);
        Cstream.flushfinalblock ();
      Return Encoding.UTF8.GetString (Mstream.toarray ());
      catch {return decryptstring; } String encryptstr = Encryptdesstring.encryptdes ("Aaaaaaaaaa", "ssssssss");

 Returns the encrypted string decryptstr = Encryptdesstring.decryptdes (Encryptstr, "ssssssss");//Decrypt string

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