md5bean.java

在线教育平台： 从小学

package edu;

/** 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 Md5Bean {
	/*
	 * 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 S12 = 12;

	static final int S11 = 7;

	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 Md5Bean() {
		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 = 0, j = 0;
		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 String encode(String s) {
		return s;
	}

	public String decode(String s) {
		return getMD5ofStr(s);
	}

	/*
	 * public static void main(String args[]) {
	 * 
	 * Md5Bean m = new Md5Bean(); //如果没有参数，执行标准的Test Suite
	 * 
	 * m.getMD5ofStr("abcdefghijklmnopqrstuvwxyz");
	 * System.out.print(m.getMD5ofStr("0")); }
	 */

}