在JSP中如何实现MD5加密

来源:网络时间:2011-07-05 16:04:54

  源码

  /**
  * 类名:md5Digest<br>
  * 说明:用来进行密码加密md5公用参数<br>
  * 编写日期:2001/03/05<br>
  * 修改者:<br>
  * 修改信息:<br>
  * @authoredgarlo edgarlo@china.com
  * @version1.0<br>
  */
  
  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>

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