C # implements DES Encryption and decryption code

Source: Internet
Author: User
Tags flush

Using System;

Using System.IO;

Using System.Security.Cryptography;

Namespace Vavic

{

///

A summary description of the security.

///

public class Security

{

Const string key_64 = "Vavicapp";

Const string iv_64 = "Vavicapp"; Attention, it's 8 characters, 64 bits.

Public Security ()

{

//

TODO: Add constructor logic here

//

}

public static string Encode (String data)

{

byte[] Bykey = System.Text.ASCIIEncoding.ASCII.GetBytes (key_64);

byte[] Byiv = System.Text.ASCIIEncoding.ASCII.GetBytes (iv_64);

DESCryptoServiceProvider CryptoProvider = new DESCryptoServiceProvider ();

int i = cryptoprovider.keysize;

MemoryStream ms = new MemoryStream ();

CryptoStream CST = new CryptoStream (Ms,cryptoprovider.createencryptor (Bykey,byiv), cryptostreammode.write);

StreamWriter sw = new StreamWriter (CST);

Sw. Write (data);

Sw. Flush ();

Cst. FlushFinalBlock ();

Sw. Flush ();

Return convert.tobase64string (Ms. GetBuffer (), 0, (int) Ms. Length);

}

public static string Decode (String data)

{

byte[] Bykey = System.Text.ASCIIEncoding.ASCII.GetBytes (key_64);

byte[] Byiv = System.Text.ASCIIEncoding.ASCII.GetBytes (iv_64);

Byte[] Byenc;

Try

{

Byenc = convert.frombase64string (data);

}

Catch

{

return null;

}

DESCryptoServiceProvider CryptoProvider = new DESCryptoServiceProvider ();

MemoryStream ms = new MemoryStream (BYENC);

CryptoStream CST = new CryptoStream (Ms,cryptoprovider.createdecryptor (Bykey,byiv), cryptostreammode.read);

StreamReader sr = new StreamReader (CST);

return Sr. ReadToEnd ();

}

}

}

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