關(guān)于java加解密自己之前了解不多禁炒，今天因?yàn)轫?xiàng)目需要用DESede加密蚌堵，于是臨時(shí)各種谷歌在網(wǎng)上查了很久芍秆，終于在百度貼吧尚武堂找到了一個(gè)關(guān)于DESede加解密的例子都伪，以下是轉(zhuǎn)載的尚武堂貼吧中的一個(gè)DESede加解密的例子

import java.security.Security;  
  
import javax.crypto.Cipher;  
import javax.crypto.SecretKey;  
import javax.crypto.spec.SecretKeySpec;  
  
  
public class Xin {  
  
    /** 
     * @param args在java中調(diào)用sun公司提供的3DES加密解密算法時(shí)最欠，需要使 
     * 用到$JAVA_HOME/jre/lib/目錄下如下的4個(gè)jar包： 
     *jce.jar 
     *security/US_export_policy.jar 
     *security/local_policy.jar 
     *ext/sunjce_provider.jar 
     */  
     private static final String Algorithm = "DESede"; //定義加密算法,可用 DES,DESede,Blowfish  
     //keybyte為加密密鑰示罗，長(zhǎng)度為24字節(jié)  
     //src為被加密的數(shù)據(jù)緩沖區(qū)（源）  
     public static byte[] encryptMode(byte[] keybyte,byte[] src){  
     try {  
     //生成密鑰  
     SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);  
     //加密  
     Cipher c1 = Cipher.getInstance(Algorithm);  
     c1.init(Cipher.ENCRYPT_MODE, deskey);  
     return c1.doFinal(src);//在單一方面的加密或解密  
     } catch (java.security.NoSuchAlgorithmException e1) {  
     // TODO: handle exception  
     e1.printStackTrace();  
     }catch(javax.crypto.NoSuchPaddingException e2){  
     e2.printStackTrace();  
     }catch(java.lang.Exception e3){  
     e3.printStackTrace();  
     }  
     return null;  
     }  
     //keybyte為加密密鑰，長(zhǎng)度為24字節(jié)  
     //src為加密后的緩沖區(qū)  
       
     public static byte[] decryptMode(byte[] keybyte,byte[] src){  
         try {  
         //生成密鑰  
         SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);  
         //解密  
         Cipher c1 = Cipher.getInstance(Algorithm);  
         c1.init(Cipher.DECRYPT_MODE, deskey);  
         return c1.doFinal(src);  
         } catch (java.security.NoSuchAlgorithmException e1) {  
         // TODO: handle exception  
         e1.printStackTrace();  
         }catch(javax.crypto.NoSuchPaddingException e2){  
         e2.printStackTrace();  
         }catch(java.lang.Exception e3){  
         e3.printStackTrace();  
         }  
         return null;  
         }  
       
       
     //轉(zhuǎn)換成十六進(jìn)制字符串  
     public static String byte2Hex(byte[] b){  
     String hs="";  
     String stmp="";  
     for(int n=0; n<b.length; n++){  
     stmp = (java.lang.Integer.toHexString(b[n]& 0XFF));  
     if(stmp.length()==1){  
     hs = hs + "0" + stmp;  
     }else{  
     hs = hs + stmp;  
     }  
     if(n<b.length-1)hs=hs+":";  
     }  
     return hs.toUpperCase();  
     }  
       
     public static void main(String[] args) {  
         // TODO Auto-generated method stub  
         //添加新安全算法,如果用JCE就要把它添加進(jìn)去  
         Security.addProvider(new com.sun.crypto.provider.SunJCE());  
//         final byte[] keyBytes = {0x11, 0x22, 0x4F, 0x58,  
//         (byte)0x88, 0x10, 0x40, 0x38, 0x28, 0x25, 0x79, 0x51,  
//         (byte)0xCB,  
//         (byte)0xDD, 0x55, 0x66, 0x77, 0x29, 0x74,  
//         (byte)0x98, 0x30, 0x40, 0x36,  
//         (byte)0xE2  
//         };   //24字節(jié)的密鑰  
         String s="scretdes234234234fdgdfgd";  
         final byte[] keyBytes=s.getBytes();  
         String szSrc = "This is a 3DES test. 測(cè)試";  
         System.out.println("加密前的字符串:" + szSrc);  
         byte[] encoded = encryptMode(keyBytes,szSrc.getBytes());  
         System.out.println("加密后的字符串:" + new String(encoded));  
         byte[] srcBytes = decryptMode(keyBytes,encoded);  
         System.out.println("解密后的字符串:" + (new String(srcBytes)));  
           
         String abc="scretdes234234234fdgdfgd";  
         System.out.println(abc.getBytes().length);  
         }  
}  

由于自己之前不清楚 DESede解密的密鑰必須是24字節(jié)的芝硬，所以之前隨便使用了一個(gè)字符串導(dǎo)致一直無(wú)法加解密成功蚜点，看到上邊事例后用24字節(jié)的密匙就成功了，自此希望各位注意一下：java DES加解密的密鑰必須為8字節(jié) DESede密鑰則為24字節(jié) 代碼最后兩行是測(cè)試密鑰字節(jié)用的