SOURCE Recommendation: Use C # to write DES encryption program framework

Program | Encryption source recommendation: Use C # to write DES encryption program framework
Batman
Or my old point of view, we have to keep practicing to learn new things. So
I will not write some abstract concept, I intend to give some actual code later, hehe
In Microsoft's help, like to take it with examples called its new technology framework, I
It really does feel in real programming, and we often write our own based on these instance codes.
Practical application, so I also used the term framework. ：）
This example demonstrates how to use the encryption package in C # to encrypt the DES algorithm because
Ngwnet help is really simple, and not the same, hehe, but we can use
This example is a glimpse of the use of Des cryptography.
The Des_demo.cs code is as follows:

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

public class Encryptstringdes {

public static void Main (string[] args) {
if (args. Length < 1) {
Console.WriteLine ("Usage:des_demo <string-to-encrypt>", args[0]);
Return
}

Using the UTF8 function to encrypt input parameters
UTF8Encoding utf8encoding = new UTF8Encoding ();
byte[] Inputbytearray = Utf8encoding.getbytes (args[0). ToCharArray ());

Mode one: invokes the default Des implementation method DES_CSP.
Des des = des. Create ();
Mode two: Entities directly using DES_CSP () to implement DES
DES_CSP DES = new DES_CSP ();

Initializes the DES-encrypted key and a random, 8-bit initialization vector (IV)
Byte[] key = {0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xef};
Byte[] IV = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xef};
Des. key = key;
DES.IV = IV;

Create an encrypted stream
Symmetricstreamencryptor SSE = des. CreateEncryptor ();

To obtain the output of the encryption process using the Cryptomemorystream method
Cryptomemorystream cms = new Cryptomemorystream ();

Output encrypted data from the Symmetricstreamencryptor stream to the Cryptomemorystream
Sse. Setsink (CMS);

Complete encryption, output the results to the console
Sse. Write (Inputbytearray);
Sse. Closestream ();

Get Encrypted data
byte[] EncryptedData = cms. Data;

Output after encryption results
Console.WriteLine ("Encrypted Result:");
for (int i = 0; i < encrypteddata.length; i++) {
Console.Write ("{0:x2}", Encrypteddata[i]);
}
Console.WriteLine ();

This shows how to encrypt, and the following shows how to decrypt it
Symmetricstreamdecryptor SSD = des. CreateDecryptor ();
CMS = new Cryptomemorystream ();
Ssds. Setsink (CMS);
Ssds. Write (EncryptedData);
Ssds. Closestream ();

byte[] Decrypteddata = cms. Data;
char[] Decryptedchararray = Utf8encoding.getchars (Decrypteddata);
Console.WriteLine ("Decrypted Data:");
Console.Write (Decryptedchararray);
Console.WriteLine ();
}
}

Compile:
D:\CSHARP&GT;CSC Des_demo.cs
Microsoft (R) C # Compiler Version 7.00.8905 [NGWS runtime 2000.14.1812.10]
Copyright (C) Microsoft Corp. 2000. All rights reserved.

Run instance:
D:\csharp>des_demo.exe the framework for using C # to write DES encryption programs
Encryption results:
3D C6 D1 C4 C3 CF + CE 2F D0 E1 2A 4D ED 7A A8 0E F9 BA 38
7B 8D B5 E9 3F 0D C3 D1 F9 6D 4 b 6E A7 41 68 40
Post-decryption data:
Using C # to write the framework of DES encryption programs