JAVA加密解密之3DES(TripleDES)

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3DES算法简介

3DES（或称为Triple DES）是三重数据加密算法（TDEA，Triple Data Encryption Algorithm）块密码的通称。它相当于是对每个数据块应用三次DES加密算法。由于计算机运算能力的增强，原版DES密码的密钥长度变得容易被暴力破解；3DES即是设计用来提供一种相对简单的方法，即通过增加DES的密钥长度来避免类似的攻击，而不是设计一种全新的块密码算法。

3DES算法实现

package com.jianggujin.codec;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;import javax.crypto.spec.IvParameterSpec;import javax.crypto.spec.SecretKeySpec;/** * 3DES（或称为Triple DES）是三重数据加密算法（TDEA，Triple Data Encryption * Algorithm）块密码的通称。它相当于是对每个数据块应用三次DES加密算法 *  * @author jianggujin * */public class HQTripleDES{   private static HQTripleDES tripleDES = new HQTripleDES();   public static HQTripleDES getInstance()   {      return tripleDES;   }   private HQTripleDES()   {   }   /**    * DES算法    *     * @author jianggujin    *    */   public static enum HQDESAlgorithm   {      DES("DES"), DESede("DESede");      private String name;      private HQDESAlgorithm(String name)      {         this.name = name;      }      public String getName()      {         return this.name;      }   }   /**    * 工作模式    *     * @author jianggujin    *    */   public static enum HQWorkingMode   {      /**       * 该模式不能使用向量       */      ECB("ECB"), CBC("CBC"), CFB("CFB"), OFB("OFB"), CTR("CTR");      private String name;      private HQWorkingMode(String name)      {         this.name = name;      }      public String getName()      {         return this.name;      }   }   /**    * 填充方式    *     * @author jianggujin    *    */   public static enum HQPadding   {      NoPadding("NoPadding"), PKCS5Padding("PKCS5Padding");      private String name;      private HQPadding(String name)      {         this.name = name;      }      public String getName()      {         return this.name;      }   }   public byte[] encrypt(byte[] data, byte[] key, HQDESAlgorithm algorithm, HQWorkingMode workingMode,         HQPadding padding, byte[] iv)   {      return encrypt(data, key, algorithm.getName(), workingMode.getName(), padding.getName(), iv);   }   public byte[] encrypt(byte[] data, byte[] key, String algorithm, String workingMode, String padding, byte[] iv)   {      return operate(Cipher.ENCRYPT_MODE, data, key, algorithm, workingMode, padding, iv);   }   public byte[] decrypt(byte[] data, byte[] key, HQDESAlgorithm algorithm, HQWorkingMode workingMode,         HQPadding padding, byte[] iv)   {      return decrypt(data, key, algorithm.getName(), workingMode.getName(), padding.getName(), iv);   }   public byte[] decrypt(byte[] data, byte[] key, String algorithm, String workingMode, String padding, byte[] iv)   {      return operate(Cipher.DECRYPT_MODE, data, key, algorithm, workingMode, padding, iv);   }   private byte[] operate(int mode, byte[] data, byte[] key, String algorithm, String workingMode, String padding,         byte[] iv)   {      try      {         String fullAlg = algorithm + "/" + workingMode + "/" + padding;         Cipher cipher = Cipher.getInstance(fullAlg);         SecretKey secretKey = new SecretKeySpec(key, algorithm);         if (!HQWorkingMode.ECB.getName().equalsIgnoreCase(workingMode))         {            IvParameterSpec ivSpec = new IvParameterSpec(iv);            cipher.init(mode, secretKey, ivSpec);         }         else         {            cipher.init(mode, secretKey);         }         return cipher.doFinal(data);      }      catch (Exception e)      {         throw new IllegalArgumentException(e);      }   }   public byte[] initKey(HQDESAlgorithm algorithm)   {      return initKey(algorithm.getName());   }   public byte[] initKey(String algorithm)   {      try      {         KeyGenerator kg = KeyGenerator.getInstance(algorithm);         return kg.generateKey().getEncoded();      }      catch (Exception e)      {         throw new IllegalArgumentException(e);      }   }   public byte[] initIv(HQDESAlgorithm algorithm, HQWorkingMode workingMode, HQPadding padding)   {      return initIv(algorithm.getName(), workingMode.getName(), padding.getName());   }   /**    * 初始化向量    *     * @param algorithm    * @param workingMode    * @param padding    * @return    */   public byte[] initIv(String algorithm, String workingMode, String padding)   {      try      {         String fullAlg = algorithm + "/" + workingMode + "/" + padding;         Cipher cipher = Cipher.getInstance(fullAlg);         int blockSize = cipher.getBlockSize();         byte[] iv = new byte[blockSize];         for (int i = 0; i < blockSize; i++)         {            iv[i] = 0;         }         return iv;      }      catch (Exception e)      {         throw new IllegalArgumentException(e);      }   }}

测试代码：

import org.junit.Test;import com.jianggujin.codec.HQBase64;import com.jianggujin.codec.HQTripleDES;import com.jianggujin.codec.HQTripleDES.HQDESAlgorithm;import com.jianggujin.codec.HQTripleDES.HQPadding;import com.jianggujin.codec.HQTripleDES.HQWorkingMode;public class TripleDESTest{   HQTripleDES tripleDES = HQTripleDES.getInstance();   HQBase64 base64 = HQBase64.getInstance();   @Test   public void encode() throws Exception   {      byte[] data = "jianggujin111111".getBytes();      HQDESAlgorithm[] algorithms = HQDESAlgorithm.values();      for (HQDESAlgorithm algorithm : algorithms)      {         System.err.println("==================================");         System.err.println(algorithm);         byte[] key = tripleDES.initKey(algorithm);         System.err.println("密钥：" + base64.encodeToString(key));         HQWorkingMode[] workingModes = HQWorkingMode.values();         for (HQWorkingMode workingMode : workingModes)         {            HQPadding[] paddings = HQPadding.values();            for (HQPadding padding : paddings)            {               byte[] iv = tripleDES.initIv(algorithm, workingMode, padding);               System.err.println(algorithm + "/" + workingMode + "/" + padding);               byte[] result = tripleDES.encrypt(data, key, algorithm, workingMode, padding, iv);               System.err.println("加密：" + base64.encodeToString(result));               System.err                     .println("解密：" + new String(tripleDES.decrypt(result, key, algorithm, workingMode, padding, iv)));            }         }      }   }}

测试结果

==================================
DES
密钥：ofIC5uXZ754=
DES/ECB/NoPadding
加密：qaEHXwEVY9iuFZLTD2bDyA==
解密：jianggujin111111
DES/ECB/PKCS5Padding
加密：qaEHXwEVY9iuFZLTD2bDyOQlcSKjJb+i
解密：jianggujin111111
DES/CBC/NoPadding
加密：qaEHXwEVY9jgG/JKXYLcgw==
解密：jianggujin111111
DES/CBC/PKCS5Padding
加密：qaEHXwEVY9jgG/JKXYLcg3N/cxnimaLm
解密：jianggujin111111
DES/CFB/NoPadding
加密：dsPgiySVucQEVUAtgK0ZyQ==
解密：jianggujin111111
DES/CFB/PKCS5Padding
加密：dsPgiySVucQEVUAtgK0ZyaVTB89CwHpP
解密：jianggujin111111
DES/OFB/NoPadding
加密：dsPgiySVucTWkKy2vR2yiQ==
解密：jianggujin111111
DES/OFB/PKCS5Padding
加密：dsPgiySVucTWkKy2vR2yiQBec6XLe53i
解密：jianggujin111111
DES/CTR/NoPadding
加密：dsPgiySVucSH/JuiQdPsTw==
解密：jianggujin111111
DES/CTR/PKCS5Padding
加密：dsPgiySVucSH/JuiQdPsTw==
解密：jianggujin111111
==================================
DESede
密钥：wrXx75tblFffNzjsnq7aYWsCa6Hqzvhd
DESede/ECB/NoPadding
加密：MrKciDR8RABzp56s4JcC9w==
解密：jianggujin111111
DESede/ECB/PKCS5Padding
加密：MrKciDR8RABzp56s4JcC98Lz4tvLaEjk
解密：jianggujin111111
DESede/CBC/NoPadding
加密：MrKciDR8RACeMsUkhLbNrw==
解密：jianggujin111111
DESede/CBC/PKCS5Padding
加密：MrKciDR8RACeMsUkhLbNryFRHLVNiiNU
解密：jianggujin111111
DESede/CFB/NoPadding
加密：RnEVDpqPPEc6CTyUfmPFJQ==
解密：jianggujin111111
DESede/CFB/PKCS5Padding
加密：RnEVDpqPPEc6CTyUfmPFJUYfDNnsJTd2
解密：jianggujin111111
DESede/OFB/NoPadding
加密：RnEVDpqPPEd7Qlc9kgBgBQ==
解密：jianggujin111111
DESede/OFB/PKCS5Padding
加密：RnEVDpqPPEd7Qlc9kgBgBXDUv7EOlzgi
解密：jianggujin111111
DESede/CTR/NoPadding
加密：RnEVDpqPPEdLUDlgMH+QWQ==
解密：jianggujin111111
DESede/CTR/PKCS5Padding
加密：RnEVDpqPPEdLUDlgMH+QWQ==
解密：jianggujin111111

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