/************************************************
MD5 算法的Java Bean
@author:killsun:170781
Last Modified:10,Mar,2002
*************************************************/
package com.HandcnCMS.utility;
import java.lang.reflect.*;
/*************************************************
md5 類實(shí)現(xiàn)了RSA Data Security, Inc.在提交給IETF
的RFC1321中的MD5 message-digest 算法。
*************************************************/

/************************************************
引用方法：
要import com.XXX.util.MD5;
然后
String loginPassword;//存倒數(shù)據(jù)庫(kù)中的密碼
String s;//用戶輸入的密碼
MD5 oMD5= new MD5();
String pwdmd5 = oMD5.getMD5ofStr(s);  
loginPassword=pwdmd5;

*************************************************/
public class MD5 {
 /* 下面這些S11-S44實(shí)際上是一個(gè)4*4的矩陣，在原始的C實(shí)現(xiàn)中是用#define 實(shí)現(xiàn)的，
 這里把它們實(shí)現(xiàn)成為static final是表示了只讀，切能在同一個(gè)進(jìn)程空間內(nèi)的多個(gè)
 Instance間共享*/
		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 };
		/* 下面的三個(gè)成員是MD5計(jì)算過程中用到的3個(gè)核心數(shù)據(jù)，在原始的C實(shí)現(xiàn)中
		   被定義到MD5_CTX結(jié)構(gòu)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的唯一一個(gè)公共成員，是最新一次計(jì)算結(jié)果的
　  16進(jìn)制ASCII表示.
 */
		public String digestHexStr;
        
		/* digest,是最新一次計(jì)算結(jié)果的2進(jìn)制內(nèi)部表示，表示128bit的MD5值.
 */
		private byte[] digest = new byte[16];
        
 /*
   getMD5ofStr是類MD5最主要的公共方法，入口參數(shù)是你想要進(jìn)行MD5變換的字符串
   返回的是變換完的結(jié)果，這個(gè)結(jié)果是從公共成員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;

		}
		// 這是MD5這個(gè)類的標(biāo)準(zhǔn)構(gòu)造函數(shù)，JavaBean要求有一個(gè)public的并且沒有參數(shù)的構(gòu)造函數(shù)
		public MD5() {
				md5Init();

				return;
		}
        


		/* md5Init是一個(gè)初始化函數(shù)，初始化核心變量，裝入標(biāo)準(zhǔn)的幻數(shù) */
		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個(gè)基本的MD5函數(shù)，在原始的MD5的C實(shí)現(xiàn)中，由于它們是
		簡(jiǎn)單的位運(yùn)算，可能出于效率的考慮把它們實(shí)現(xiàn)成了宏，在java中，我們把它們
　　	   實(shí)現(xiàn)成了private方法，名字保持了原來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將調(diào)用F,G,H,I進(jìn)行近一步變換
		  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的主計(jì)算過程，inbuf是要變換的字節(jié)串，inputlen是長(zhǎng)度，這個(gè)
		 函數(shù)由getMD5ofStr調(diào)用，調(diào)用之前需要調(diào)用md5init，因此把它設(shè)計(jì)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整理和填寫輸出結(jié)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是一個(gè)內(nèi)部使用的byte數(shù)組的塊拷貝函數(shù)，從input的inpos開始把len長(zhǎng)度的
　　　　　 字節(jié)拷貝到output的outpos位置開始 
		*/

		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核心變換程序，有md5Update調(diào)用，block是分塊的原始字節(jié)
		*/
		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數(shù)組按順序拆成byte數(shù)組，因?yàn)閖ava的long類型是64bit的，
		  只拆低32bit，以適應(yīng)原始C實(shí)現(xiàn)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數(shù)組按順序合成成long數(shù)組，因?yàn)閖ava的long類型是64bit的，
		  只合成低32bit，高32bit清零，以適應(yīng)原始C實(shí)現(xiàn)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是我寫的一個(gè)把byte按照不考慮正負(fù)號(hào)的原則的＂升位＂程序，因?yàn)閖ava沒有unsigned運(yùn)算
		*/
		public static long b2iu(byte b) {
				return b < 0 ? b & 0x7F + 128 : b;
		}
        
 /*byteHEX()，用來把一個(gè)byte類型的數(shù)轉(zhuǎn)換成十六進(jìn)制的ASCII表示，
　 因?yàn)閖ava中的byte的toString無法實(shí)現(xiàn)這一點(diǎn)，我們又沒有C語言中的
   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) {   //如果沒有參數(shù)，執(zhí)行標(biāo)準(zhǔn)的Test Suite
                
				 System.out.println("MD5 Test suite:");
				 System.out.println("MD5(\"10\"):"+m.getMD5ofStr("355694005457784"));
				 System.out.println("MD5(\"11\"):"+m.getMD5ofStr("800922"));
				 System.out.println("MB5(\"12\"):"+m.getMD5ofStr("781214"));
				 System.out.println("MD5(\"13\"):"+m.getMD5ofStr("13"));
				 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]));
                
         
		}
	}