md5.java

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package com.sinosoft.common;

public class Md5 {

	   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 };

	   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


	   public String digestHexStr;

	   private byte[] digest = new byte[16];


	   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;
			   //return inbuf;//返回为明码，用户存储不加密2004-7-16
	   }

	   public Md5() {
		   md5Init();
		   return;
	   }

	   private void md5Init() {
		   count[0] = 0L;
		   count[1] = 0L;
		   state[0] = 0x67452301L;
		   state[1] = 0xefcdab89L;
		   state[2] = 0x98badcfeL;
		   state[3] = 0x10325476L;

		   return;
	   }

	   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));
	   }

	   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;
	   }

	   private void md5Update(byte[] inbuf, int inputLen) {

		   int i, index, partLen;
		   byte[] block = new byte[64];
		   index = (int)(count[0] >>> 3) & 0x3F;

		   if ((count[0] += (inputLen << 3)) < (inputLen << 3))
			   count[1]++;
			   count[1] += (inputLen >>> 29);

			   partLen = 64 - index;

			   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;

			   md5Memcpy(buffer, inbuf, index, i, inputLen - i);

	   }

	   private void md5Final () {
		   byte[] bits = new byte[8];
		   int index, padLen;

		   Encode (bits, count, 8);

		   index = (int)(count[0] >>> 3) & 0x3f;
		   padLen = (index < 56) ? (56 - index) : (120 - index);
		   md5Update (PADDING, padLen);

		   md5Update(bits, 8);

		   Encode (digest, state, 16);

	   }   
	   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];
	   }

	   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);

		   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 */

		   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 */


		   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 */

		   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;

	   }

	   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);
		   }
	   }

	   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;
	   }


	   public static long b2iu(byte b) {
			   return b < 0 ? b & 0x7F + 128 : b;
	   }

	   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 toMD5(String source){
		 //return this.getMD5ofStr(source);
		 return source;
	   }
}