SHA-1和MD5示例程序 Java编写详解架构师

/**
 * SHA-1和MD5示例程序 Java编写
 */

package com.koal.svs;

public class MYDigest {

/**
* @param args
*/

public static void main(String[] args) {
   // TODO Auto-generated method stub
 MYDigest mydigest=new MYDigest();
   mydigest.testDigest();

}

public void testDigest()
{
   try
   {
    String myinfo=”my test information!”;
    java.security.MessageDigest alga=java.security.MessageDigest.getInstance(“SHA-1”);
    alga.update(myinfo.getBytes());
    byte[] digesta=alga.digest();  
    System.out.println(“本信息SHA-1摘要是：”+byte2hex(digesta));
   
    java.security.MessageDigest algb=java.security.MessageDigest.getInstance(“MD5”);
    algb.update(myinfo.getBytes());
    byte[] digestb=algb.digest();  
    System.out.println(“本信息MD5摘要是：  “+byte2hex(digestb));
   
    if(algb.isEqual(digesta, algb.digest()))
    {
     System.out.println(“equal!”);
    }
    else
    {
     System.out.println(“failure”);
    }
  
   }
   catch(java.security.NoSuchAlgorithmException ex)
   {
    System.out.println(ex.toString());
   }
}

public 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();
}

}

程序运行结果如下：

本信息SHA-1摘要是：DC:22:48:48:0E:6F:6B:90:A8:F0:D1:0E:66:D6:D4:63:EB:E2:FC:5A
本信息MD5摘要是：  C9:AA:1A:FB:B9:DA:A6:CC:AD:7D:38:0A:48:F1:2E:B6
failure