一、前言
在项目需要添加安全模块，客户端调用服务端发布的service必须要经过验证，加密算法采用DES，客户端采用C#进行加密，服务端使用Java进行解密。废话不多说，直接上代码。
二、客户端
客户端采用C#进行开发，C#进行DES加密解密代码清单如下：
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);//建立加密对象的密钥和偏移量 //原文使用ASCIIEncoding.ASCII方法的GetBytes方法 //使得输入密码必须输入英文文本 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));}}}
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运行结果：
34DB26C86E933FB8F9C294A563BEF742D85451292A3C40C6FC8DF5A99C56EDCC
-03-10 12:43:05IAMACOEDR
三、服务器
服务器采用Java进行开发，Java进行DES加密解密代码清单如下：
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); } // 加密数据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 = .URLEncoder.encode(value, "utf-8"); System.out.println("加密数据:"+ formatString); String encryptedString = toHexString(encrypt(formatString, key));System.out.println("加密后的数据为:" + encryptedString); String decryptedString = .URLDecoder.decode(decrypt(encryptedString, key), "utf-8") ; System.out.println("解密后的数据:" + decryptedString);} }
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运行结果：
加密数据:IAMACODER
加密后的数据为:a8a3f8641ec18ddeff808105c493510e
解密后的数据:IAMACODER
四、测试C#加密&Java解密
将C#端加密的字符串传入Java端(替换decrypt中的encryptedString即可)直接进行解密，可以得到如下结果：
加密数据:IAMACODER
加密后的数据为:a8a3f8641ec18ddeff808105c493510e
解密后的数据:-03-10 12:43:05IAMACOEDR
五、总结
这是一个小的功能模块，有此需求的园友可以直接拿去使用，谢谢各位园友观看~
