java兑现md5加密算法

package com.sambow.tools;

public class MD5Encrypt {
	
	/*
	 *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
	 */
	private static final int S11 = 7;	
	private static final int S12 = 12;	
	private static final int S13 = 17;	
	private static final int S14 = 22;	
	private static final int S21 = 5;	
	private static final int S22 = 9;	
	private static final int S23 = 14;	
	private static final int S24 = 20;	
	private static final int S31 = 4;	
	private static final int S32 = 11;	
	private static final int S33 = 16;	
	private static final int S34 = 23;	
	private static final int S41 = 6;	
	private static final int S42 = 10;	
	private static final int S43 = 15;	
	private static final int S44 = 21;
	
	private 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.
	 */
	private 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];
	
	//MD5唯一实例;
	private static MD5Encrypt instance =null;
	
    /*
     * 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
     */
	private MD5Encrypt(){
		md5Init();
		return;
	}
	
	/*
	 * 返回MD5Encrypt实例
	 */
	public static MD5Encrypt getInstance(){
		if(instance == null){
			instance = new MD5Encrypt(); 
		}
		return instance;
	}
	
	
	
	//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
	 */
	private 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)
	 */
	private 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;
	}
	
	/*
	 * encrypt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 encrypt(String inbuf){
		md5Init();
		md5Update(inbuf.getBytes(), inbuf.length());
		md5Final();
		digestHexStr = "";
		for (int i = 0; i < 16; i++) {
			digestHexStr += byteHEX(digest[i]);
		}
		return digestHexStr;
	}
	
	/*
	 * 测试
	 */
	public static void main(String[] args){
		System.out.println(MD5Encrypt.getInstance().encrypt("TestPassword"));	
	}
}

package com.mcsky.framework.util;

import java.security.MessageDigest;

public class MD5Build {

	public static String byte2hex(byte[] b) {
		String hs = "";
		String stmp = "";
		for (int n = 0; n < b.length; n++) {
			stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
			if (stmp.length() == 1)
				hs = hs + "0" + stmp;
			else
				hs = hs + stmp;
		}
		return hs.toUpperCase();
	}

	public static String MD5Crypt(String s) {
		try {
			byte[] strTemp = s.getBytes();
			MessageDigest mdTemp = MessageDigest.getInstance("MD5");
			mdTemp.update(strTemp);
			byte[] md = mdTemp.digest();
			return byte2hex(md);
		} catch (Exception e) {
			return null;
		}
	}