【知識積累】DES算法之C#加密Java解密

一、前言

　　在項目需要添加安全模塊，客戶端調用服務端發布的service必須要經過驗證，加密算法采用DES，客戶端采用C#進行加密，服務端使用Java進行解密。廢話不多說，直接上代碼。

二、客戶端

　　客戶端采用C#進行開發，C#進行DES加密解密代碼清單如下：　

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.IO;namespace DESHelper
{public class DESHelper{private static string m_encryptkey = "ENCRYPTT";private static string m_str = "IAMACOEDR";public static string DESEncrypt(){string str = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + m_str;DESCryptoServiceProvider des = new DESCryptoServiceProvider();byte[] inputByteArray = Encoding.GetEncoding("UTF-8").GetBytes(str);//建立加密對象的密鑰和偏移量    //原文使用ASCIIEncoding.ASCII方法的GetBytes方法    //使得輸入密碼必須輸入英文文本    des.Key = ASCIIEncoding.ASCII.GetBytes(m_encryptkey);des.IV = ASCIIEncoding.ASCII.GetBytes(m_encryptkey);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();}public static string DESDecrypt(string pToDecrypt, string sKey){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 System.Text.Encoding.Default.GetString(ms.ToArray());}static void Main(string[] args){string str = DESEncrypt();Console.WriteLine(str);Console.WriteLine(DESDecrypt(str, m_encryptkey));}}
}

　　運行結果：

　　34DB26C86E933FB8F9C294A563BEF742D85451292A3C40C6FC8DF5A99C56EDCC
　　2016-03-10 12:43:05IAMACOEDR

三、服務器

　　服務器采用Java進行開發，Java進行DES加密解密代碼清單如下：　

import javax.crypto.SecretKey;   
import javax.crypto.SecretKeyFactory;   
import javax.crypto.spec.DESKeySpec;   
import javax.crypto.spec.IvParameterSpec;  
import java.security.Key;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.Cipher;public class Des {       //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);    }  // 加密數據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 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 key = "ENCRYPTT";   String value = "IAMACODER";   String formatString = java.net.URLEncoder.encode(value, "utf-8");             System.out.println("加密數據:"+ formatString);   String encryptedString = toHexString(encrypt(formatString, key));                    System.out.println("加密后的數據為:" + encryptedString);   String decryptedString = java.net.URLDecoder.decode(decrypt(encryptedString, key), "utf-8") ;   System.out.println("解密后的數據:" + decryptedString);     }    
}

　　運行結果：

　　加密數據:IAMACODER
　　加密后的數據為:a8a3f8641ec18ddeff808105c493510e
　　解密后的數據:IAMACODER

四、測試C#加密&Java解密

　　將C#端加密的字符串傳入Java端(替換decrypt中的encryptedString即可)直接進行解密，可以得到如下結果：

　　加密數據:IAMACODER
　　加密后的數據為:a8a3f8641ec18ddeff808105c493510e
　　解密后的數據:2016-03-10 12:43:05IAMACOEDR

五、總結

　　這是一個小的功能模塊，有此需求的園友可以直接拿去使用，謝謝各位園友觀看~