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至顶网软件频道应用软件在JSP中如何实现MD5加密

在JSP中如何实现MD5加密

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在JSP中如何实现MD5加密

作者: 来源:中国软件网 2008年6月23日

关键字: 实现 MD JSP

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  源码

  /**

  * 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 edgarlo@china.com

  * @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

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

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