import javax.crypto.Cipher; 
import javax.crypto.SecretKey; 
import javax.crypto.SecretKeyFactory; 
import javax.crypto.spec.DESKeySpec; 
import javax.crypto.spec.IvParameterSpec;

public class Des { 
private byte[] desKey;

//解密數據 
public static String decrypt(String message,String key) throws Exception {

byte[] bytesrc =convertHexString(message); 
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); 
DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8")); 
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); 
SecretKey secretKey = keyFactory.generateSecret(desKeySpec); 
IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));

cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);

byte[] retByte = cipher.doFinal(bytesrc); 
return new String(retByte); 
}

public static byte[] encrypt(String message, String key) 
throws Exception { 
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); 
SecretKey secretKey = keyFactory.generateSecret(desKeySpec); 
IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8")); 
cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);

return cipher.doFinal(message.getBytes("UTF-8")); 
}

public static byte[] convertHexString(String ss) 
{ 
byte digest[] = new byte[ss.length() / 2]; 
for(int i = 0; i < digest.length; i++) 
{ 
String byteString = ss.substring(2 * i, 2 * i + 2); 
int byteValue = Integer.parseInt(byteString, 16); 
digest[i] = (byte)byteValue; 
}

return digest; 
}

public static void main(String[] args) throws Exception { 
String key = "12345678"; 
String value="test1234 "; 
String jiami=java.net.URLEncoder.encode(value, "utf-8").toLowerCase();

System.out.println("加密數據:"+jiami); 
String a=toHexString(encrypt(jiami, key)).toUpperCase();

System.out.println("加密后的數據為:"+a); 
String b=java.net.URLDecoder.decode(decrypt(a,key), "utf-8") ; 
System.out.println("解密后的數據:"+b);

}

public static String toHexString(byte b[]) { 
StringBuffer hexString = new StringBuffer(); 
for (int i = 0; i < b.length; i++) { 
String plainText = Integer.toHexString(0xff & b[i]); 
if (plainText.length() < 2) 
plainText = "0" + plainText; 
hexString.append(plainText); 
}

return hexString.toString(); 
}

}

using System; 
using System.Data; 
using System.Configuration; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Web.UI.HtmlControls; 
using System.Data.SqlClient; 
using System.Security.Cryptography; 
using System.IO; 
using System.Text; 
public class TestDes{ 
//cookies加密密鑰 
public static string DES_Key = "12345678";

#region DESEnCode DES加密 
public static string DESEnCode(string pToEncrypt, string sKey) 
{ 
pToEncrypt = HttpContext.Current.Server.UrlEncode(pToEncrypt); 
DESCryptoServiceProvider des = new DESCryptoServiceProvider(); 
byte[] inputByteArray = Encoding.GetEncoding("UTF-8").GetBytes(pToEncrypt);

des.Key = ASCIIEncoding.ASCII.GetBytes(sKey); 
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey); 
MemoryStream ms = new MemoryStream(); 
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);

cs.Write(inputByteArray, 0, inputByteArray.Length); 
cs.FlushFinalBlock();

StringBuilder ret = new StringBuilder(); 
foreach (byte b in ms.ToArray()) 
{ 
ret.AppendFormat("{0:X2}", b); 
} 
ret.ToString(); 
return ret.ToString(); 
} 
#endregion

#region DESDeCode DES解密 
public static string DESDeCode(string pToDecrypt, string sKey) 
{ 
// HttpContext.Current.Response.Write(pToDecrypt + "<br>" + sKey); 
// HttpContext.Current.Response.End(); 
DESCryptoServiceProvider des = new DESCryptoServiceProvider();

byte[] inputByteArray = new byte[pToDecrypt.Length / 2]; 
for (int x = 0; x < pToDecrypt.Length / 2; x++) 
{ 
int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16)); 
inputByteArray[x] = (byte)i; 
}

des.Key = ASCIIEncoding.ASCII.GetBytes(sKey); 
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey); 
MemoryStream ms = new MemoryStream(); 
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write); 
cs.Write(inputByteArray, 0, inputByteArray.Length); 
cs.FlushFinalBlock();

StringBuilder ret = new StringBuilder();

return HttpContext.Current.Server.UrlDecode(System.Text.Encoding.Default.GetString(ms.ToArray())); 
} 
#endregion

public TestDes() 
{ 
// 
// TODO: 在此處添加構造函數邏輯 
// 
} 
}