最近一个项目中，因为服务端是用的java开发的，客户端是用的C#，由于通信部分采用到了3DES加密，所以做个记录，以备以后需要的时候直接用。

　　这是对方（java）的加密算法，和网上流传的代码也差不多（主密钥直接写死了，方便测试）

 package org.zwork.market.mina.msg;

 import java.security.spec.KeySpec;

 import javax.crypto.Cipher;

 import javax.crypto.SecretKey;

 import javax.crypto.SecretKeyFactory;

 import javax.crypto.spec.DESKeySpec;

 import javax.crypto.spec.DESedeKeySpec;

 import org.slf4j.Logger;

 import org.slf4j.LoggerFactory;

 import org.zwork.market.MktContants;

 public class ThreeEncryptDecrypt {

     private static final Logger LOGGER = LoggerFactory.getLogger(ThreeEncryptDecrypt.class);

     // 定义 加密算法,可用 DES,DESede,Blowfish

     public static final String Algorithm = "DESede";

     public static String DES = "DES/ECB/NoPadding";

     public static String TriDes = "DESede/ECB/NoPadding";

     // des加密

     public static byte[] des_crypt(byte key[], byte data[]) {

         try {

             KeySpec ks = new DESKeySpec(key);

             SecretKeyFactory kf = SecretKeyFactory.getInstance("DES");

             SecretKey ky = kf.generateSecret(ks);

             Cipher c = Cipher.getInstance(DES);

             c.init(Cipher.ENCRYPT_MODE, ky);

             return c.doFinal(data);

         } catch (Exception e) {

             LOGGER.error("des_crypt error:", e);

             return null;

         }

     }

     // des解密

     public static byte[] des_decrypt(byte key[], byte data[]) {

         try {

             KeySpec ks = new DESKeySpec(key);

             SecretKeyFactory kf = SecretKeyFactory.getInstance("DES");

             SecretKey ky = kf.generateSecret(ks);

             Cipher c = Cipher.getInstance(DES);

             c.init(Cipher.DECRYPT_MODE, ky);

             return c.doFinal(data);

         } catch (Exception e) {

             LOGGER.error("des_decrypt error:", e);

             return null;

         }

     }

     // 3DES加密

     public static byte[] trides_crypt(byte key[], byte data[]) {

         try {

             byte[] k = new byte[];

             int len = data.length;

             if (data.length %  != ) {

                 len = data.length - data.length %  + ;

             }

             byte[] needData = null;

             if (len != )

                 needData = new byte[len];

             for (int i = ; i < len; i++) {

                 needData[i] = 0x00;

             }

             System.arraycopy(data, , needData, , data.length);

             if (key.length == ) {

                 System.arraycopy(key, , k, , key.length);

                 System.arraycopy(key, , k, , );

             } else {

                 System.arraycopy(key, , k, , );

             }

             KeySpec ks = new DESedeKeySpec(k);

             SecretKeyFactory kf = SecretKeyFactory.getInstance("DESede");

             SecretKey ky = kf.generateSecret(ks);

             Cipher c = Cipher.getInstance(TriDes);

             c.init(Cipher.ENCRYPT_MODE, ky);

             return c.doFinal(needData);

         } catch (Exception e) {

             LOGGER.error("trides_crypt error:", e);

             return null;

         }

     }

     // 3DES解密

     public static byte[] trides_decrypt(byte key[], byte data[]) {

         try {

             byte[] k = new byte[];

             int len = data.length;

             if (data.length %  != ) {

                 len = data.length - data.length %  + ;

             }

             byte[] needData = null;

             if (len != )

                 needData = new byte[len];

             for (int i = ; i < len; i++) {

                 needData[i] = 0x00;

             }

             System.arraycopy(data, , needData, , data.length);

             if (key.length == ) {

                 System.arraycopy(key, , k, , key.length);

                 System.arraycopy(key, , k, , );

             } else {

                 System.arraycopy(key, , k, , );

             }

             KeySpec ks = new DESedeKeySpec(k);

             SecretKeyFactory kf = SecretKeyFactory.getInstance("DESede");

             SecretKey ky = kf.generateSecret(ks);

             Cipher c = Cipher.getInstance(TriDes);

             c.init(Cipher.DECRYPT_MODE, ky);

             return c.doFinal(needData);

         } catch (Exception e) {

             LOGGER.error("trides_decrypt error:", e);

             return null;

         }

     }

     public static String getPass(String source) {

         byte[] data= hexToBytes(source);

         byte[] key ="111111111111111111111111111a1.1.".getBytes();

         String result = byte2hex(trides_decrypt(key, data)).toUpperCase();

         return result.substring(, );

     }

     public static String byte2hex(byte[] data) {

         StringBuffer sb = new StringBuffer();

         for (int i = ; i < data.length; i++) {

             String temp = Integer.toHexString(((int) data[i]) & 0xFF);

             for (int t = temp.length(); t < ; t++) {

                 sb.append("");

             }

             sb.append(temp);

         }

         return sb.toString();

     }

     public static byte[] hexToBytes(String str) {

         if (str == null) {

             return null;

         } else if (str.length() < ) {

             return null;

         } else {

             int len = str.length() / ;

             byte[] buffer = new byte[len];

             for (int i = ; i < len; i++) {

                 buffer[i] = (byte) Integer.parseInt(str.substring(i * , i *  + ), );

             }

             return buffer;

         }

     }

 }

　　因为客户端只负责数据加密，所以我这里只写了加密的部分。由于java和C#语言很相似，所以我就仿这他们给的java代码改成C#的，当然也在网上参考了一些代码，不过中间还是出现了些问题，比如C#不支持弱密钥（把密钥弄复杂点）,因为没注意大小写造成加密结果不一致等等。编程这东西一个点都能让整个系统崩溃，所以小细节很重要！！！

     public class DESHelper

     {

         /// <summary>

         /// 将密码转成直接数组

         /// </summary>

         /// <param name="str"></param>

         /// <returns></returns>

         public static byte[] HexToBytes(String str)

         {

             if (str == null)

             {

                 return null;

             }

             else if (str.Length < )

             {

                 return null;

             }

             else

             {

                 int len = str.Length / ;

                 byte[] buffer = new byte[len];

                 for (int i = ; i < len; i++)

                 {

                     var temp = str.Substring(i * , );

                     buffer[i] = (byte)Convert.ToInt32(temp, );

                 }

                 return buffer;

             }

         }

         /// <summary>

         /// 3DES加密

         /// </summary>

         /// <param name="key"></param>

         /// <param name="data"></param>

         /// <returns></returns>

         public static byte[] GetDes3EncryptedText(byte[] key, byte[] data)

         {

             byte[] k = new byte[];

             int len = data.Length;

             if (data.Length %  != )

             {

                 len = data.Length - data.Length %  + ;

             }

             byte[] needData = null;

             if (len != )

                 needData = new byte[len];

             for (int i = ; i < len; i++)

             {

                 needData[i] = 0x00;

             }

             Buffer.BlockCopy(data, , needData, , data.Length);

             if (key.Length == )

             {

                 Buffer.BlockCopy(key, , k, , key.Length);

                 Buffer.BlockCopy(key, , k, , );

             }

             else

             {

                 Buffer.BlockCopy(key, , k, , );

             }

             var des3 = new TripleDESCryptoServiceProvider();

             des3.Key = k;

             des3.Mode = CipherMode.ECB;

             des3.Padding = PaddingMode.Zeros;

             using (MemoryStream ms = new MemoryStream())

             using (CryptoStream cs = new CryptoStream(ms, des3.CreateEncryptor(), CryptoStreamMode.Write))

             {

                 cs.Write(data, , data.Length);

                 cs.FlushFinalBlock();

                 return ms.ToArray();

             }

         }

         /// <summary>

         /// 将加密结果转成字符串

         /// </summary>

         /// <param name="data"></param>

         /// <returns></returns>

         public static String GetByte2Hex(byte[] data)

         {

             StringBuilder sb = new StringBuilder();

             for (int i = ; i < data.Length; i++)

             {

                 String temp = string.Format("{0:X}", ((int)data[i]) & 0xFF);

                 for (int t = temp.Length; t < ; t++)

                 {

                     sb.Append("");

                 }

                 sb.Append(temp);

             }

             return sb.ToString();

         }

     }

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