在JSP中如何成功实现MD5加密

发布时间：2023-05-31 13:37:12 所属栏目：教程来源：

导读：在jsp中如何实现md5加密

edgarlo (2001-05-18 19:51:00)

/**

* 类名： md5digest 

* 说明：用来进行密码加密的md5公用参数 

* 编写日期： 2001/03/05 

* 修改者：

在jsp中如何实现md5加密

edgarlo (2001-05-18 19:51:00)

/**

* 类名： md5digest 

* 说明： 用来进行密码加密的md5公用参数 

* 编写日期： 2001/03/05 

* 修改者： 

* 修改信息： 

* @author edgarlo [email protected]

* @version 1.0 

*/

import java.security.messagedigest;

import java.security.nosuchalgorithmexception;

public class md5digest

{

 private messagedigest __md5 = null;

 private stringbuffer __digestbuffer = null;

 public md5digest()

 throws nosuchalgorithmexception

 {

 __md5 = messagedigest.getinstance("md5");

 __digestbuffer = new stringbuffer();

 }

 public string md5crypt(string s)

 {

 __digestbuffer.setlength(0);

 byte abyte0[] = __md5.digest(s.getbytes());

 for(int i = 0; i < abyte0.length; i++)

 __digestbuffer.append(tohex(abyte0[i]));

 return __digestbuffer.tostring();

 }

 public string tohex(byte one){

 string hex="0123456789abcdef";

 char[] result=new char[2];

 result[0]=hex.charat((one & 0xf0) >> 4);

 result[1]=hex.charat(one & 0x0f);

 string mm=new string(result);

 return mm;

 }

}

--------------------------------------------------------------------------------

/************************************************

md5 算法的java bean

@author:topcat tuppin

last modified:10,mar,2001

*************************************************/

package beartool;

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);

 }

 /* 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;

 }

 /*

 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]));

 }

}

jsp中的使用方法

-------------------------------------------------------------------------------

<%@ page language='java' %>

<jsp:usebean id='omd5' scope='request' class='beartool.md5'/>

<%@ page import='java.util.*'%>

<%@ page import='java.sql.*'%>

<html>

<body>

<%

 string userid = request.getparameter("userid"); //获取用户输入userid

 string password = request.getparameter("password"); //获取用户输入的password

 string pwdmd5 = omd5.getmd5ofstr(password); //计算md5的值

 printwriter rp = response.getwriter();

 class.forname("sun.jdbc.odbc.jdbcodbcdriver");

 connection con = drivermanager.getconnection("jdbc:odbc:community", "", "");

 statement stmt = con.createstatement();

 resultset rs = stmt.executequery("select * from users where userid ='"+userid+"' and pwdmd5= '" + pwdmd5+"'" );

 if (rs.next())

 {

 rp.print("login ok");

 }

 else

 {

 rp.print("login fail");

 }

 stmt.close();

 con.close();

%>

</body>

</html>

（编辑：聊城站长网）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!

斩魂黑屏怎么办	安装系统找不到硬盘怎
Windows 任务管理器打	amd和英特尔哪个好以及