md5.java

来自「spring+struts+hibernate做的银行系统」· Java 代码 · 共 192 行

/*
 * Created on 2006-3-8
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package cn.com.tym.pub;

/**
 * @author Boss
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class MD5 {
	  /*
	    * A Java implementation of the RSA Data Security, Inc. MD5 Message
	    * Digest Algorithm, as defined in RFC 1321.
	    * Based on the JavaScript implementation of Paul Johnston
	    *      Copyright (C) Paul Johnston 1999 - 2000.
	    *      See http://pajhome.org.uk/site/legal.html for details.
	    * Java Version by Thomas Weber (Orange Interactive GmbH)
	    */

	   /*
	    * Convert a 32-bit number to a hex string with ls-byte first
	    */
	   String hex_chr = "0123456789abcdef";
	   private String rhex(int num)
	   {
	     String str = "";
	     for(int j = 0; j <= 3; j++)
	       str = str + hex_chr.charAt((num >> (j * 8 + 4)) & 0x0F) + hex_chr.charAt((num >> (j * 8)) & 0x0F);
	     return str;
	   }

	   /*
	    * Convert a string to a sequence of 16-word blocks, stored as an array.
	    * Append padding bits and the length, as described in the MD5 standard.
	    */
	   private int[] str2blks_MD5(String str)
	   {
	     int nblk = ((str.length() + 8) >> 6) + 1;
	     int[] blks = new int[nblk * 16];
	     int i = 0;
	     for(i = 0; i < nblk * 16; i++) {
	       blks[i] = 0;
	     }
	     for(i = 0; i < str.length(); i++) {
	       blks[i >> 2] |= str.charAt(i) << ((i % 4) * 8);
	     }
	     blks[i >> 2] |= 0x80 << ((i % 4) * 8);
	     blks[nblk * 16 - 2] = str.length()*8;

	     return blks;
	   }

	   /*
	    * Add integers, wrapping at 2^32
	    */
	   private int add(int x, int y)
	   {
	     return ((x&0x7FFFFFFF) + (y&0x7FFFFFFF)) ^ (x&0x80000000) ^ (y&0x80000000);
	   }

	   /*
	    * Bitwise rotate a 32-bit number to the left
	    */
	   private int rol(int num, int cnt)
	   {
	     return (num << cnt) | (num >>> (32 - cnt));
	   }

	   /*
	    * These functions implement the basic operation for each round of the
	    * algorithm.
	    */
	   private int cmn(int q, int a, int b, int x, int s, int t)
	   {
	     return add(rol(add(add(a, q), add(x, t)), s), b);
	   }
	   private int ff(int a, int b, int c, int d, int x, int s, int t)
	   {
	     return cmn((b & c) | ((~b) & d), a, b, x, s, t);
	   }
	   private int gg(int a, int b, int c, int d, int x, int s, int t)
	   {
	     return cmn((b & d) | (c & (~d)), a, b, x, s, t);
	   }
	   private int hh(int a, int b, int c, int d, int x, int s, int t)
	   {
	     return cmn(b ^ c ^ d, a, b, x, s, t);
	   }
	   private int ii(int a, int b, int c, int d, int x, int s, int t)
	   {
	     return cmn(c ^ (b | (~d)), a, b, x, s, t);
	   }

	   /*
	    * Take a string and return the hex representation of its MD5.
	    */
	   public String calcMD5(String str)
	   {
	     int[] x = str2blks_MD5(str);
	     int a = 0x67452301;
	     int b = 0xEFCDAB89;
	     int c = 0x98BADCFE;
	     int d = 0x10325476;

	     for(int i = 0; i < x.length; i += 16)
	     {
	       int olda = a;
	       int oldb = b;
	       int oldc = c; 
	       int oldd = d;

	       a = ff(a, b, c, d, x[i+ 0], 7 , 0xD76AA478);
	       d = ff(d, a, b, c, x[i+ 1], 12, 0xE8C7B756);
	       c = ff(c, d, a, b, x[i+ 2], 17, 0x242070DB);
	       b = ff(b, c, d, a, x[i+ 3], 22, 0xC1BDCEEE);
	       a = ff(a, b, c, d, x[i+ 4], 7 , 0xF57C0FAF);
	       d = ff(d, a, b, c, x[i+ 5], 12, 0x4787C62A);
	       c = ff(c, d, a, b, x[i+ 6], 17, 0xA8304613);
	       b = ff(b, c, d, a, x[i+ 7], 22, 0xFD469501);
	       a = ff(a, b, c, d, x[i+ 8], 7 , 0x698098D8);
	       d = ff(d, a, b, c, x[i+ 9], 12, 0x8B44F7AF);
	       c = ff(c, d, a, b, x[i+10], 17, 0xFFFF5BB1);
	       b = ff(b, c, d, a, x[i+11], 22, 0x895CD7BE);
	       a = ff(a, b, c, d, x[i+12], 7 , 0x6B901122);
	       d = ff(d, a, b, c, x[i+13], 12, 0xFD987193);
	       c = ff(c, d, a, b, x[i+14], 17, 0xA679438E);
	       b = ff(b, c, d, a, x[i+15], 22, 0x49B40821);

	       a = gg(a, b, c, d, x[i+ 1], 5 , 0xF61E2562);
	       d = gg(d, a, b, c, x[i+ 6], 9 , 0xC040B340);
	       c = gg(c, d, a, b, x[i+11], 14, 0x265E5A51);
	       b = gg(b, c, d, a, x[i+ 0], 20, 0xE9B6C7AA);
	       a = gg(a, b, c, d, x[i+ 5], 5 , 0xD62F105D);
	       d = gg(d, a, b, c, x[i+10], 9 , 0x02441453);
	       c = gg(c, d, a, b, x[i+15], 14, 0xD8A1E681);
	       b = gg(b, c, d, a, x[i+ 4], 20, 0xE7D3FBC8);
	       a = gg(a, b, c, d, x[i+ 9], 5 , 0x21E1CDE6);
	       d = gg(d, a, b, c, x[i+14], 9 , 0xC33707D6);
	       c = gg(c, d, a, b, x[i+ 3], 14, 0xF4D50D87);
	       b = gg(b, c, d, a, x[i+ 8], 20, 0x455A14ED);
	       a = gg(a, b, c, d, x[i+13], 5 , 0xA9E3E905);
	       d = gg(d, a, b, c, x[i+ 2], 9 , 0xFCEFA3F8);
	       c = gg(c, d, a, b, x[i+ 7], 14, 0x676F02D9);
	       b = gg(b, c, d, a, x[i+12], 20, 0x8D2A4C8A);

	       a = hh(a, b, c, d, x[i+ 5], 4 , 0xFFFA3942);
	       d = hh(d, a, b, c, x[i+ 8], 11, 0x8771F681);
	       c = hh(c, d, a, b, x[i+11], 16, 0x6D9D6122);
	       b = hh(b, c, d, a, x[i+14], 23, 0xFDE5380C);
	       a = hh(a, b, c, d, x[i+ 1], 4 , 0xA4BEEA44);
	       d = hh(d, a, b, c, x[i+ 4], 11, 0x4BDECFA9);
	       c = hh(c, d, a, b, x[i+ 7], 16, 0xF6BB4B60);
	       b = hh(b, c, d, a, x[i+10], 23, 0xBEBFBC70);
	       a = hh(a, b, c, d, x[i+13], 4 , 0x289B7EC6);
	       d = hh(d, a, b, c, x[i+ 0], 11, 0xEAA127FA);
	       c = hh(c, d, a, b, x[i+ 3], 16, 0xD4EF3085);
	       b = hh(b, c, d, a, x[i+ 6], 23, 0x04881D05);
	       a = hh(a, b, c, d, x[i+ 9], 4 , 0xD9D4D039);
	       d = hh(d, a, b, c, x[i+12], 11, 0xE6DB99E5);
	       c = hh(c, d, a, b, x[i+15], 16, 0x1FA27CF8);
	       b = hh(b, c, d, a, x[i+ 2], 23, 0xC4AC5665);

	       a = ii(a, b, c, d, x[i+ 0], 6 , 0xF4292244);
	       d = ii(d, a, b, c, x[i+ 7], 10, 0x432AFF97);
	       c = ii(c, d, a, b, x[i+14], 15, 0xAB9423A7);
	       b = ii(b, c, d, a, x[i+ 5], 21, 0xFC93A039);
	       a = ii(a, b, c, d, x[i+12], 6 , 0x655B59C3);
	       d = ii(d, a, b, c, x[i+ 3], 10, 0x8F0CCC92);
	       c = ii(c, d, a, b, x[i+10], 15, 0xFFEFF47D);
	       b = ii(b, c, d, a, x[i+ 1], 21, 0x85845DD1);
	       a = ii(a, b, c, d, x[i+ 8], 6 , 0x6FA87E4F);
	       d = ii(d, a, b, c, x[i+15], 10, 0xFE2CE6E0);
	       c = ii(c, d, a, b, x[i+ 6], 15, 0xA3014314);
	       b = ii(b, c, d, a, x[i+13], 21, 0x4E0811A1);
	       a = ii(a, b, c, d, x[i+ 4], 6 , 0xF7537E82);
	       d = ii(d, a, b, c, x[i+11], 10, 0xBD3AF235);
	       c = ii(c, d, a, b, x[i+ 2], 15, 0x2AD7D2BB);
	       b = ii(b, c, d, a, x[i+ 9], 21, 0xEB86D391);

	       a = add(a, olda);
	       b = add(b, oldb);
	       c = add(c, oldc);
	       d = add(d, oldd);
	     }
	     return rhex(a) + rhex(b) + rhex(c) + rhex(d);
	   }
	}