C#用DES加密JAVA用DES解密，JAVA用DES加密C#用DES解密的实现

这里贴出来的是可通用的C#与jav的DES加密类，希望对大家管用直接复制即可用
C#DES加密解密类

Java代码


///<summary><![CDATA[加密解密帮助类]]></summary>

public class Help_Encrypt

{

///<summary><![CDATA[字符串DES加密函数]]></summary>

///<param name="str"><![CDATA[被加密字符串 ]]></param>

///<param name="key"><![CDATA[密钥 ]]></param>

///<returns><![CDATA[加密后字符串]]></returns>

public static string Encode(string str, string key)

{

try

{

DESCryptoServiceProvider provider = new DESCryptoServiceProvider();

provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));

provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));

byte[] bytes = Encoding.GetEncoding("GB2312").GetBytes(str);

MemoryStream stream = new MemoryStream();

CryptoStream stream2 = new CryptoStream(stream, provider.CreateEncryptor(), CryptoStreamMode.Write);

stream2.Write(bytes, 0, bytes.Length);

stream2.FlushFinalBlock();

StringBuilder builder = new StringBuilder();

foreach (byte num in stream.ToArray())

{

builder.AppendFormat("{0:X2}", num);

}

stream.Close();

return builder.ToString();

}

catch (Exception) { return "xxxx"; }

}

///<summary><![CDATA[字符串DES解密函数]]></summary>

///<param name="str"><![CDATA[被解密字符串 ]]></param>

///<param name="key"><![CDATA[密钥 ]]></param>

///<returns><![CDATA[解密后字符串]]></returns>

public static string Decode(string str, string key)

{

try

{

DESCryptoServiceProvider provider = new DESCryptoServiceProvider();

provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));

provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));

byte[] buffer = new byte[str.Length / 2];

for (int i = 0; i < (str.Length / 2); i++)

{

int num2 = Convert.ToInt32(str.Substring(i * 2, 2), 0x10);

buffer[i] = (byte)num2;

}

MemoryStream stream = new MemoryStream();

CryptoStream stream2 = new CryptoStream(stream, provider.CreateDecryptor(), CryptoStreamMode.Write);

stream2.Write(buffer, 0, buffer.Length);

stream2.FlushFinalBlock();

stream.Close();

return Encoding.GetEncoding("GB2312").GetString(stream.ToArray());

}

catch (Exception) { return ""; }

}

}

JAVADES加密解密类

package com.bgxt.messages;

import java.io.UnsupportedEncodingException;

import java.security.*;

import javax.crypto.Cipher;

import javax.crypto.SecretKey;

import javax.crypto.SecretKeyFactory;

import javax.crypto.spec.DESKeySpec;

import javax.crypto.spec.IvParameterSpec;

/**

* 字符串工具集合

* @author Liudong

*/

public class StringUtils {

private static final String PASSWORD_CRYPT_KEY = XmlUtil.getConfig().getPasswdKey().substring(0,8);

//private final static String DES = "DES";

//private static final byte[] desKey;

//解密数据

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 String encrypt(String value){

String result="";

try{

value=java.net.URLEncoder.encode(value, "utf-8");

result=toHexString(encrypt(value, PASSWORD_CRYPT_KEY)).toUpperCase();

}catch(Exception ex){

ex.printStackTrace();

return "";

}

return result;

}

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 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();

}

public static void main(String[] args) throws Exception {

String value="01";

System.out.println("加密数据:"+value);

System.out.println("密码为:"+XmlUtil.getConfig().getPasswdKey());

String a=encrypt( value);

System.out.println("加密后的数据为:"+a);

}

}