100分求高手教我用md5

MD5 myMD5 = new MD5();
aUserInfo.setRePasswd(myMD5.getMD5ofStr(regActionForm.getPasswd1()));

/**
* 对字符串进行md5加密
public String encodeMD5(String u_pwd)
{

String hs="";
String stmp="";
try{
byte[] a=u_pwd.getBytes();
MessageDigest mda=MessageDigest.getInstance("MD5");
mda.update(a);
byte[] da=mda.digest();
for (int n=0;n<da.length;n++)
{
  stmp=(java.lang.Integer.toHexString(da[n] & 0XFF));
  if (stmp.length()==1)
hs=hs+"0"+stmp;
  else hs=hs+stmp;
}
hs=hs.toUpperCase();
}
catch(Exception e)
{
System.out.print(e);
}
return hs;
return u_pwd;
}
*/

/************************************************
MD5 算法的Java Bean
@author:Topcat Tuppin
Last Modified:10,Mar,2001
*************************************************/
package aips.base;
import java.lang.reflect.*;
/*************************************************
md5 类实现了RSA Data Security, Inc.在提交给IETF
的RFC1321中的MD5 message-digest 算法。
*************************************************/public class MD5 {
/* 下面这些S11-S44实际上是一个4*4的矩阵，在原始的C实现中是用#define 实现的，
这里把它们实现成为static final是表示了只读，切能在同一个进程空间内的多个
Instance间共享*/
        static final int S11 = 7;
        static final int S12 = 12;
        static final int S13 = 17;
        static final int S14 = 22;        static final int S21 = 5;
        static final int S22 = 9;
        static final int S23 = 14;
        static final int S24 = 20;        static final int S31 = 4;
        static final int S32 = 11;
        static final int S33 = 16;
        static final int S34 = 23;        static final int S41 = 6;
        static final int S42 = 10;
        static final int S43 = 15;
        static final int S44 = 21;        static final byte[] PADDING = { -128, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
        /* 下面的三个成员是MD5计算过程中用到的3个核心数据，在原始的C实现中
           被定义到MD5_CTX结构中         */
        private long[] state = new long[4];  // state (ABCD)
        private long[] count = new long[2];  // number of bits, modulo 2^64 (lsb first)
        private byte[] buffer = new byte[64]; // input buffer /* digestHexStr是MD5的唯一一个公共成员，是最新一次计算结果的
　 16进制ASCII表示.
*/
        public String digestHexStr;        /* digest,是最新一次计算结果的2进制内部表示，表示128bit的MD5值.
*/
        private byte[] digest = new byte[16]; /*
  getMD5ofStr是类MD5最主要的公共方法，入口参数是你想要进行MD5变换的字符串
  返回的是变换完的结果，这个结果是从公共成员digestHexStr取得的．
*/
        public String getMD5ofStr(String inbuf) {
                md5Init();
                md5Update(inbuf.getBytes(), inbuf.length());
                md5Final();
                digestHexStr = "";
                for (int i = 0; i < 16; i++) {
                        digestHexStr += byteHEX(digest[i]);
                }
                return digestHexStr;        }
        // 这是MD5这个类的标准构造函数，JavaBean要求有一个public的并且没有参数的构造函数
        public MD5() {
                md5Init();                return;
        }        /* md5Init是一个初始化函数，初始化核心变量，装入标准的幻数 */
        private void md5Init() {
                count[0] = 0L;
                count[1] = 0L;
                ///* Load magic initialization constants.                state[0] = 0x67452301L;
                state[1] = 0xefcdab89L;
                state[2] = 0x98badcfeL;
                state[3] = 0x10325476L;                return;
        }
        /* F, G, H ,I 是4个基本的MD5函数，在原始的MD5的C实现中，由于它们是
        简单的位运算，可能出于效率的考虑把它们实现成了宏，在java中，我们把它们
     　　实现成了private方法，名字保持了原来C中的。 */        private long F(long x, long y, long z) {
                return (x & y) | ((~x) & z);        }
        private long G(long x, long y, long z) {
                return (x & z) | (y & (~z));        }
        private long H(long x, long y, long z) {
                return x ^ y ^ z;
        }        private long I(long x, long y, long z) {
                return y ^ (x | (~z));
        }       /*
          FF,GG,HH和II将调用F,G,H,I进行近一步变换
          FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
          Rotation is separate from addition to prevent recomputation.
       */        private long FF(long a, long b, long c, long d, long x, long s,
                long ac) {
                a += F (b, c, d) + x + ac;
                a = ((int) a << s) | ((int) a >>> (32 - s));
                a += b;
                return a;
        }        private long GG(long a, long b, long c, long d, long x, long s,
                long ac) {
                a += G (b, c, d) + x + ac;
                a = ((int) a << s) | ((int) a >>> (32 - s));
                a += b;
                return a;
        }
        private long HH(long a, long b, long c, long d, long x, long s,
                long ac) {
                a += H (b, c, d) + x + ac;
                a = ((int) a << s) | ((int) a >>> (32 - s));
                a += b;
                return a;
        }
        private long II(long a, long b, long c, long d, long x, long s,
                long ac) {
                a += I (b, c, d) + x + ac;
                a = ((int) a << s) | ((int) a >>> (32 - s));
                a += b;
                return a;
        }
        /*
         md5Update是MD5的主计算过程，inbuf是要变换的字节串，inputlen是长度，这个
         函数由getMD5ofStr调用，调用之前需要调用md5init，因此把它设计成private的
        */
        private void md5Update(byte[] inbuf, int inputLen) {                int i, index, partLen;
                byte[] block = new byte[64];
                index = (int)(count[0] >>> 3) & 0x3F;
                // /* Update number of bits */
                if ((count[0] += (inputLen << 3)) < (inputLen << 3))
                        count[1]++;
                count[1] += (inputLen >>> 29);                partLen = 64 - index;                // Transform as many times as possible.
                if (inputLen >= partLen) {
                        md5Memcpy(buffer, inbuf, index, 0, partLen);
                        md5Transform(buffer);                        for (i = partLen; i + 63 < inputLen; i += 64) {                                md5Memcpy(block, inbuf, 0, i, 64);
                                md5Transform (block);
                        }
                        index = 0;                } else                        i = 0;                ///* Buffer remaining input */
                md5Memcpy(buffer, inbuf, index, i, inputLen - i);        }        /*
          md5Final整理和填写输出结果
        */
        private void md5Final () {
                byte[] bits = new byte[8];
                int index, padLen;                ///* Save number of bits */
                Encode (bits, count, 8);                ///* Pad out to 56 mod 64.
                index = (int)(count[0] >>> 3) & 0x3f;
                padLen = (index < 56) ? (56 - index) : (120 - index);
                md5Update (PADDING, padLen);                ///* Append length (before padding) */
                md5Update(bits, 8);                ///* Store state in digest */
                Encode (digest, state, 16);        }接下一贴

接上一贴
        /* md5Memcpy是一个内部使用的byte数组的块拷贝函数，从input的inpos开始把len长度的
　　　　　字节拷贝到output的outpos位置开始
        */        private void md5Memcpy (byte[] output, byte[] input,
                int outpos, int inpos, int len)
        {
                int i;                for (i = 0; i < len; i++)
                        output[outpos + i] = input[inpos + i];
        }        /*
           md5Transform是MD5核心变换程序，有md5Update调用，block是分块的原始字节
        */
        private void md5Transform (byte block[]) {
                long a = state[0], b = state[1], c = state[2], d = state[3];
                long[] x = new long[16];                Decode (x, block, 64);                /* Round 1 */
                a = FF (a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */
                d = FF (d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */
                c = FF (c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */
                b = FF (b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */
                a = FF (a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */
                d = FF (d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */
                c = FF (c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */
                b = FF (b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */
                a = FF (a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */
                d = FF (d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */
                c = FF (c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */
                b = FF (b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */
                a = FF (a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */
                d = FF (d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */
                c = FF (c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */
                b = FF (b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */                /* Round 2 */
                a = GG (a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */
                d = GG (d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */
                c = GG (c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */
                b = GG (b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */
                a = GG (a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */
                d = GG (d, a, b, c, x[10], S22, 0x2441453L); /* 22 */
                c = GG (c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */
                b = GG (b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */
                a = GG (a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */
                d = GG (d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */
                c = GG (c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */
                b = GG (b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */
                a = GG (a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */
                d = GG (d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */
                c = GG (c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */
                b = GG (b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */                /* Round 3 */
                a = HH (a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */
                d = HH (d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */
                c = HH (c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */
                b = HH (b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */
                a = HH (a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */
                d = HH (d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */
                c = HH (c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */
                b = HH (b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */
                a = HH (a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */
                d = HH (d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */
                c = HH (c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */
                b = HH (b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */
                a = HH (a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */
                d = HH (d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */
                c = HH (c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */
                b = HH (b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */                /* Round 4 */
                a = II (a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */
                d = II (d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */
                c = II (c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */
                b = II (b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */
                a = II (a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */
                d = II (d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */
                c = II (c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */
                b = II (b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */
                a = II (a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */
                d = II (d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */
                c = II (c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */
                b = II (b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */
                a = II (a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */
                d = II (d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */
                c = II (c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */
                b = II (b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */                state[0] += a;
                state[1] += b;
                state[2] += c;
                state[3] += d;        }        /*Encode把long数组按顺序拆成byte数组，因为java的long类型是64bit的，
          只拆低32bit，以适应原始C实现的用途
        */
        private void Encode (byte[] output, long[] input, int len) {
                int i, j;                for (i = 0, j = 0; j < len; i++, j += 4) {
                        output[j] = (byte)(input[i] & 0xffL);
                        output[j + 1] = (byte)((input[i] >>> 8) & 0xffL);
                        output[j + 2] = (byte)((input[i] >>> 16) & 0xffL);
                        output[j + 3] = (byte)((input[i] >>> 24) & 0xffL);
                }
        }        /*Decode把byte数组按顺序合成成long数组，因为java的long类型是64bit的，
          只合成低32bit，高32bit清零，以适应原始C实现的用途
        */
        private void Decode (long[] output, byte[] input, int len) {
                int i, j;
                for (i = 0, j = 0; j < len; i++, j += 4)
                        output[i] = b2iu(input[j]) |
                                (b2iu(input[j + 1]) << 8) |
                                (b2iu(input[j + 2]) << 16) |
                                (b2iu(input[j + 3]) << 24);                return;
        }     接下一贴

接上一贴
   /*
          b2iu是我写的一个把byte按照不考虑正负号的原则的＂升位＂程序，因为java没有unsigned运算
        */
        public static long b2iu(byte b) {
                return b < 0 ? b & 0x7F + 128 : b;
        } /*byteHEX()，用来把一个byte类型的数转换成十六进制的ASCII表示，
　因为java中的byte的toString无法实现这一点，我们又没有C语言中的
  sprintf(outbuf,"%02X",ib)
*/
        public static String byteHEX(byte ib) {
                char[] Digit = { '0','1','2','3','4','5','6','7','8','9',
                'A','B','C','D','E','F' };
                char [] ob = new char[2];
                ob[0] = Digit[(ib >>> 4) & 0X0F];
                ob[1] = Digit[ib & 0X0F];
                String s = new String(ob);
                return s;
        }        public static void main(String args[]) {
                MD5 m = new MD5();
                if (Array.getLength(args) == 0) {   //如果没有参数，执行标准的Test Suite                        System.out.println("MD5 Test suite:");
                 System.out.println("MD5(\"\"):"+m.getMD5ofStr(""));
                 System.out.println("MD5(\"a\"):"+m.getMD5ofStr("a"));
                 System.out.println("MD5(\"abc\"):"+m.getMD5ofStr("abc"));
                 System.out.println("MD5(\"message digest\"):"+m.getMD5ofStr("message digest"));
                 System.out.println("MD5(\"abcdefghijklmnopqrstuvwxyz\"):"+
                        m.getMD5ofStr("abcdefghijklmnopqrstuvwxyz"));
                 System.out.println("MD5(\"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789\"):"+
                      m.getMD5ofStr("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"));
                }
                else
                       System.out.println("MD5(" + args[0] + ")=" + m.getMD5ofStr(args[0]));
        }}

在Java里面本来就已经帮你做了MD5的算法了，实在没有必要像 zql2002(东方龙) 同志那样自己写一个，用它带的更安全和方便。MD5不行，可以用SHA-1啦（其实目前也没有说有多危险，只是理论上已经不再安全）
//只要换个算法就行，所以我觉得完全不应该自己去写什么MD5的算法，用Java本身的会更好
MessageDigest sha = MessageDigest.getInstance("SHA-1"); sha.update("mystring".getBytes());
System.out.println(new BASE64Encoder().encode(sha.digest()));

ChDw(米)
能不能教我一下怎么用阿？
我实在挺菜
谢谢了！

我上面不已经把代码都写完啦？？？？？？？？？？？public String encodePassword(String password) throws .... //忘记有什么异常了{
MessageDigest sha = MessageDigest.getInstance("SHA-1"); sha.update(password.getBytes());
return new BASE64Encoder().encode(sha.digest());
}加密后的字符串你保存在你的数据库字段中后面将来登录校验，大概就是如下啦：
String user = request.getParameter("user");
String password = request.getParameter("password");
String encPass = encodePassword(password);
然后执行类似的SQL语句
prep = conn.prepareStatement("select ID,name from users where name=? and password=?");
prep.setString(1,user);
prep.setString(2,encPass);
ResultSet rs = prep.executeQuery();如果rs.next()，那么就是登录成功。如果false则登录不成功啊。

ChDw(米)
可以告诉我你的联系方式吗?

我是这样写的
reg.htm<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title></title>
</head><body background="../netcenter/images/left_background.jpg" leftmargin="0" topmargin="0">
<p> </p><table width="55%" height="108" border="0" align="center" cellpadding="0" cellspacing="0">
  <tr>
    <td height="108" valign="top">
      <form method="post" action="reg_ok.jsp">
        <table width="100%" border="0" align="center" cellpadding="0" cellspacing="0">
          <tr bgcolor="">
            <td height="30" colspan="2"><table width="100%" height="100%" border="0" cellpadding="0" cellspacing="1">
                <tr>
                  <td bgcolor="#648fd7"> </td>
                </tr>
              </table></td>
          </tr>
          <tr>
            <td width="17%" height="26" class="9point">  用户名：</td>
            <td width="83%" height="26"> <input name="username" type="text" class="uloginuser" id="username"></td>
          </tr>
          <tr>
            <td height="26" class="9point">  密码：</td>
            <td height="26"><input name="password" type="password" class="uloginuser" id="password"></td>
          </tr>
          <tr>
            <td height="26"> </td>
            <td height="26"><input type="submit" name="Submit" value="提交">  
            </td>
          </tr>
        </table>
      </form ></td >
  </tr>
</table>
</body>
</html>reg_ok.jsp
<%@ page language="java" import="java.sql.*"  contentType="text/html;charset=gb2312"  errorPage=""%>
<%@ page import="sun.misc.BASE64Encoder"%>
<%@ page  import="java.security.MessageDigest"%>
<jsp:useBean id="connBean" scope="session" class="conn.DBconn" /><html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
</head>
<%!
public String encodePassword(String password)
{
     MessageDigest sha = MessageDigest.getInstance("SHA-1");     sha.update(password.getBytes());
     return new BASE64Encoder().encode(sha.digest());} %>
<body>
<%
String username = request.getParameter("username");
String password = request.getParameter("password");
String encPass = encodePassword(password);
String sql="insert userlogin (username,password) values('"+username+"','"+encPass+"')";
connBean.executeQuery(sql);
%>
</body>
</html>但是报错
org.apache.jasper.JasperException: Unable to compile class for JSPAn error occurred at line: -1 in the jsp file: nullGenerated servlet error:
    [javac] Compiling 1 source fileC:\webserv\Tomcat\work\Standalone\localhost\_\test\reg_ok_jsp.java:16: unreported exception java.security.NoSuchAlgorithmException; must be caught or declared to be thrown
     MessageDigest sha = MessageDigest.getInstance("SHA-1");
                                         ^
是怎么回事啊?
请大家帮我看看

NoSuchAlgorithmException; must be caught or declared to be thrown就是说你必须使用try catch或者在方法中声明throws，说得明明白白嘛。

这个都是Java的基础了吧，你最好看看书本上的吧
public String encodePassword(String password)
{
  try {
     MessageDigest sha = MessageDigest.getInstance("SHA-1");     sha.update(password.getBytes());
     return new BASE64Encoder().encode(sha.digest());
  }catch(java.security.NoSuchAlgorithmException e) {
    e.printStackTrace();//打印错误信息;
    return null;
  }
}

调试易

100分求高手教我用md5

解决方案 »