MD5编码工具类 MD5Code.java
- package com.util;
- public class MD5Code {
- 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];
-
- private long[] count = new long[2];
-
-
-
- private byte[] buffer = new byte[64];
-
-
- 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;
- }
-
- public MD5Code() {
- 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);
- d = FF(d, a, b, c, x[1], S12, 0xe8c7b756L);
- c = FF(c, d, a, b, x[2], S13, 0x242070dbL);
- b = FF(b, c, d, a, x[3], S14, 0xc1bdceeeL);
- a = FF(a, b, c, d, x[4], S11, 0xf57c0fafL);
- d = FF(d, a, b, c, x[5], S12, 0x4787c62aL);
- c = FF(c, d, a, b, x[6], S13, 0xa8304613L);
- b = FF(b, c, d, a, x[7], S14, 0xfd469501L);
- a = FF(a, b, c, d, x[8], S11, 0x698098d8L);
- d = FF(d, a, b, c, x[9], S12, 0x8b44f7afL);
- c = FF(c, d, a, b, x[10], S13, 0xffff5bb1L);
- b = FF(b, c, d, a, x[11], S14, 0x895cd7beL);
- a = FF(a, b, c, d, x[12], S11, 0x6b901122L);
- d = FF(d, a, b, c, x[13], S12, 0xfd987193L);
- c = FF(c, d, a, b, x[14], S13, 0xa679438eL);
- b = FF(b, c, d, a, x[15], S14, 0x49b40821L);
-
- a = GG(a, b, c, d, x[1], S21, 0xf61e2562L);
- d = GG(d, a, b, c, x[6], S22, 0xc040b340L);
- c = GG(c, d, a, b, x[11], S23, 0x265e5a51L);
- b = GG(b, c, d, a, x[0], S24, 0xe9b6c7aaL);
- a = GG(a, b, c, d, x[5], S21, 0xd62f105dL);
- d = GG(d, a, b, c, x[10], S22, 0x2441453L);
- c = GG(c, d, a, b, x[15], S23, 0xd8a1e681L);
- b = GG(b, c, d, a, x[4], S24, 0xe7d3fbc8L);
- a = GG(a, b, c, d, x[9], S21, 0x21e1cde6L);
- d = GG(d, a, b, c, x[14], S22, 0xc33707d6L);
- c = GG(c, d, a, b, x[3], S23, 0xf4d50d87L);
- b = GG(b, c, d, a, x[8], S24, 0x455a14edL);
- a = GG(a, b, c, d, x[13], S21, 0xa9e3e905L);
- d = GG(d, a, b, c, x[2], S22, 0xfcefa3f8L);
- c = GG(c, d, a, b, x[7], S23, 0x676f02d9L);
- b = GG(b, c, d, a, x[12], S24, 0x8d2a4c8aL);
-
- a = HH(a, b, c, d, x[5], S31, 0xfffa3942L);
- d = HH(d, a, b, c, x[8], S32, 0x8771f681L);
- c = HH(c, d, a, b, x[11], S33, 0x6d9d6122L);
- b = HH(b, c, d, a, x[14], S34, 0xfde5380cL);
- a = HH(a, b, c, d, x[1], S31, 0xa4beea44L);
- d = HH(d, a, b, c, x[4], S32, 0x4bdecfa9L);
- c = HH(c, d, a, b, x[7], S33, 0xf6bb4b60L);
- b = HH(b, c, d, a, x[10], S34, 0xbebfbc70L);
- a = HH(a, b, c, d, x[13], S31, 0x289b7ec6L);
- d = HH(d, a, b, c, x[0], S32, 0xeaa127faL);
- c = HH(c, d, a, b, x[3], S33, 0xd4ef3085L);
- b = HH(b, c, d, a, x[6], S34, 0x4881d05L);
- a = HH(a, b, c, d, x[9], S31, 0xd9d4d039L);
- d = HH(d, a, b, c, x[12], S32, 0xe6db99e5L);
- c = HH(c, d, a, b, x[15], S33, 0x1fa27cf8L);
- b = HH(b, c, d, a, x[2], S34, 0xc4ac5665L);
-
- a = II(a, b, c, d, x[0], S41, 0xf4292244L);
- d = II(d, a, b, c, x[7], S42, 0x432aff97L);
- c = II(c, d, a, b, x[14], S43, 0xab9423a7L);
- b = II(b, c, d, a, x[5], S44, 0xfc93a039L);
- a = II(a, b, c, d, x[12], S41, 0x655b59c3L);
- d = II(d, a, b, c, x[3], S42, 0x8f0ccc92L);
- c = II(c, d, a, b, x[10], S43, 0xffeff47dL);
- b = II(b, c, d, a, x[1], S44, 0x85845dd1L);
- a = II(a, b, c, d, x[8], S41, 0x6fa87e4fL);
- d = II(d, a, b, c, x[15], S42, 0xfe2ce6e0L);
- c = II(c, d, a, b, x[6], S43, 0xa3014314L);
- b = II(b, c, d, a, x[13], S44, 0x4e0811a1L);
- a = II(a, b, c, d, x[4], S41, 0xf7537e82L);
- d = II(d, a, b, c, x[11], S42, 0xbd3af235L);
- c = II(c, d, a, b, x[2], S43, 0x2ad7d2bbL);
- b = II(b, c, d, a, x[9], S44, 0xeb86d391L);
- 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;
- }
- }
原文地址:https://www.cnblogs.com/swite/p/5168723.html