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作者 如何正常显示消息摘要?
aaaa2004





发贴: 8
积分: 0
于 2004-10-06 12:08 user profilesend a private message to usersearch all posts byselect and copy to clipboard. 
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我在一本介绍java安全的书上看到一段计算消息摘要的程序,但是我不明白程序是如何以字符的形式显示消息摘要的,请各位大虾指教!!谢谢!!

import java.security.*;
public class DigestCalc{
public static void main(String args[ ]) throws Exception{
String x=args[0];
MessageDigest m=MessageDigest.getInstance("MD5");
m.update(x.getBytes( ));
byte s[ ]=m.digest( );
String result="";
for (int i=0; i<s.length; i++){
result+=Integer.toHexString((0x000000ff & s[i]) |
        0xffffff00).substringDevil;
   }
System.out.println(result);
}
}



作者 Re:如何正常显示消息摘要? [Re:aaaa2004]
menzy



版主


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积分: 113
于 2004-10-15 20:24 user profilesend a private message to usersearch all posts byselect and copy to clipboard. 
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public String byte2hex(byte[] b) //二行制转字符串
{
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();
}




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