Java加密解密(七、MD5)

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[];private long count[];private byte buffer[];public String digestHexStr;private byte digest[];public MD5() {state = new long[4];count = new long[2];buffer = new byte[64];digest = new byte[16];md5Init();}private void Decode(long al[], byte abyte0[], int i) {int j = 0;for (int k = 0; k < i; k += 4) {al[j] = b2iu(abyte0[k]) | b2iu(abyte0[k + 1]) << 8| b2iu(abyte0[k + 2]) << 16 | b2iu(abyte0[k + 3]) << 24;j++;}}private void Encode(byte abyte0[], long al[], int i) {int j = 0;for (int k = 0; k < i; k += 4) {abyte0[k] = (byte) (int) (al[j] & 255L);abyte0[k + 1] = (byte) (int) (al[j] >>> 8 & 255L);abyte0[k + 2] = (byte) (int) (al[j] >>> 16 & 255L);abyte0[k + 3] = (byte) (int) (al[j] >>> 24 & 255L);j++;}}private long F(long l, long l1, long l2) {return l & l1 | ~l & l2;}private long FF(long l, long l1, long l2, long l3, long l4, long l5, long l6) {l += F(l1, l2, l3) + l4 + l6;l = (int) l << (int) l5 | (int) l >>> (int) (32L - l5);l += l1;return l;}private long G(long l, long l1, long l2) {return l & l2 | l1 & ~l2;}private long GG(long l, long l1, long l2, long l3, long l4, long l5, long l6) {l += G(l1, l2, l3) + l4 + l6;l = (int) l << (int) l5 | (int) l >>> (int) (32L - l5);l += l1;return l;}private long H(long l, long l1, long l2) {return l ^ l1 ^ l2;}private long HH(long l, long l1, long l2, long l3, long l4, long l5, long l6) {l += H(l1, l2, l3) + l4 + l6;l = (int) l << (int) l5 | (int) l >>> (int) (32L - l5);l += l1;return l;}private long I(long l, long l1, long l2) {return l1 ^ (l | ~l2);}private long II(long l, long l1, long l2, long l3, long l4, long l5, long l6) {l += I(l1, l2, l3) + l4 + l6;l = (int) l << (int) l5 | (int) l >>> (int) (32L - l5);l += l1;return l;}public static long b2iu(byte byte0) {return (long) (byte0 >= 0 ? byte0 : byte0 & 0xff);}public static String byteHEX(byte byte0) {char ac[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A','B', 'C', 'D', 'E', 'F' };char ac1[] = new char[2];ac1[0] = ac[byte0 >>> 4 & 0xf];ac1[1] = ac[byte0 & 0xf];String s = new String(ac1);return s;}public String getMD5ofStr(String s) {md5Init();md5Update(s.getBytes(), s.length());md5Final();digestHexStr = "";for (int i = 0; i < 16; i++) {digestHexStr += byteHEX(digest[i]);}return digestHexStr;}private void md5Final() {byte abyte0[] = new byte[8];Encode(abyte0, count, 8);int i = (int) (count[0] >>> 3) & 0x3f;int j = i >= 56 ? 120 - i : 56 - i;md5Update(PADDING, j);md5Update(abyte0, 8);Encode(digest, state, 16);}private void md5Init() {count[0] = 0L;count[1] = 0L;state[0] = 0x67452301L;state[1] = 0xefcdab89L;state[2] = 0x98badcfeL;state[3] = 0x10325476L;}private void md5Memcpy(byte abyte0[], byte abyte1[], int i, int j, int k) {for (int l = 0; l < k; l++) {abyte0[i + l] = abyte1[j + l];}}private void md5Transform(byte abyte0[]) {long l = state[0];long l1 = state[1];long l2 = state[2];long l3 = state[3];long al[] = new long[16];Decode(al, abyte0, 64);l = FF(l, l1, l2, l3, al[0], 7L, 0xd76aa478L);l3 = FF(l3, l, l1, l2, al[1], 12L, 0xe8c7b756L);l2 = FF(l2, l3, l, l1, al[2], 17L, 0x242070dbL);l1 = FF(l1, l2, l3, l, al[3], 22L, 0xc1bdceeeL);l = FF(l, l1, l2, l3, al[4], 7L, 0xf57c0fafL);l3 = FF(l3, l, l1, l2, al[5], 12L, 0x4787c62aL);l2 = FF(l2, l3, l, l1, al[6], 17L, 0xa8304613L);l1 = FF(l1, l2, l3, l, al[7], 22L, 0xfd469501L);l = FF(l, l1, l2, l3, al[8], 7L, 0x698098d8L);l3 = FF(l3, l, l1, l2, al[9], 12L, 0x8b44f7afL);l2 = FF(l2, l3, l, l1, al[10], 17L, 0xffff5bb1L);l1 = FF(l1, l2, l3, l, al[11], 22L, 0x895cd7beL);l = FF(l, l1, l2, l3, al[12], 7L, 0x6b901122L);l3 = FF(l3, l, l1, l2, al[13], 12L, 0xfd987193L);l2 = FF(l2, l3, l, l1, al[14], 17L, 0xa679438eL);l1 = FF(l1, l2, l3, l, al[15], 22L, 0x49b40821L);l = GG(l, l1, l2, l3, al[1], 5L, 0xf61e2562L);l3 = GG(l3, l, l1, l2, al[6], 9L, 0xc040b340L);l2 = GG(l2, l3, l, l1, al[11], 14L, 0x265e5a51L);l1 = GG(l1, l2, l3, l, al[0], 20L, 0xe9b6c7aaL);l = GG(l, l1, l2, l3, al[5], 5L, 0xd62f105dL);l3 = GG(l3, l, l1, l2, al[10], 9L, 0x2441453L);l2 = GG(l2, l3, l, l1, al[15], 14L, 0xd8a1e681L);l1 = GG(l1, l2, l3, l, al[4], 20L, 0xe7d3fbc8L);l = GG(l, l1, l2, l3, al[9], 5L, 0x21e1cde6L);l3 = GG(l3, l, l1, l2, al[14], 9L, 0xc33707d6L);l2 = GG(l2, l3, l, l1, al[3], 14L, 0xf4d50d87L);l1 = GG(l1, l2, l3, l, al[8], 20L, 0x455a14edL);l = GG(l, l1, l2, l3, al[13], 5L, 0xa9e3e905L);l3 = GG(l3, l, l1, l2, al[2], 9L, 0xfcefa3f8L);l2 = GG(l2, l3, l, l1, al[7], 14L, 0x676f02d9L);l1 = GG(l1, l2, l3, l, al[12], 20L, 0x8d2a4c8aL);l = HH(l, l1, l2, l3, al[5], 4L, 0xfffa3942L);l3 = HH(l3, l, l1, l2, al[8], 11L, 0x8771f681L);l2 = HH(l2, l3, l, l1, al[11], 16L, 0x6d9d6122L);l1 = HH(l1, l2, l3, l, al[14], 23L, 0xfde5380cL);l = HH(l, l1, l2, l3, al[1], 4L, 0xa4beea44L);l3 = HH(l3, l, l1, l2, al[4], 11L, 0x4bdecfa9L);l2 = HH(l2, l3, l, l1, al[7], 16L, 0xf6bb4b60L);l1 = HH(l1, l2, l3, l, al[10], 23L, 0xbebfbc70L);l = HH(l, l1, l2, l3, al[13], 4L, 0x289b7ec6L);l3 = HH(l3, l, l1, l2, al[0], 11L, 0xeaa127faL);l2 = HH(l2, l3, l, l1, al[3], 16L, 0xd4ef3085L);l1 = HH(l1, l2, l3, l, al[6], 23L, 0x4881d05L);l = HH(l, l1, l2, l3, al[9], 4L, 0xd9d4d039L);l3 = HH(l3, l, l1, l2, al[12], 11L, 0xe6db99e5L);l2 = HH(l2, l3, l, l1, al[15], 16L, 0x1fa27cf8L);l1 = HH(l1, l2, l3, l, al[2], 23L, 0xc4ac5665L);l = II(l, l1, l2, l3, al[0], 6L, 0xf4292244L);l3 = II(l3, l, l1, l2, al[7], 10L, 0x432aff97L);l2 = II(l2, l3, l, l1, al[14], 15L, 0xab9423a7L);l1 = II(l1, l2, l3, l, al[5], 21L, 0xfc93a039L);l = II(l, l1, l2, l3, al[12], 6L, 0x655b59c3L);l3 = II(l3, l, l1, l2, al[3], 10L, 0x8f0ccc92L);l2 = II(l2, l3, l, l1, al[10], 15L, 0xffeff47dL);l1 = II(l1, l2, l3, l, al[1], 21L, 0x85845dd1L);l = II(l, l1, l2, l3, al[8], 6L, 0x6fa87e4fL);l3 = II(l3, l, l1, l2, al[15], 10L, 0xfe2ce6e0L);l2 = II(l2, l3, l, l1, al[6], 15L, 0xa3014314L);l1 = II(l1, l2, l3, l, al[13], 21L, 0x4e0811a1L);l = II(l, l1, l2, l3, al[4], 6L, 0xf7537e82L);l3 = II(l3, l, l1, l2, al[11], 10L, 0xbd3af235L);l2 = II(l2, l3, l, l1, al[2], 15L, 0x2ad7d2bbL);l1 = II(l1, l2, l3, l, al[9], 21L, 0xeb86d391L);state[0] += l;state[1] += l1;state[2] += l2;state[3] += l3;}private void md5Update(byte abyte0[], int i) {byte abyte1[] = new byte[64];int k = (int) (count[0] >>> 3) & 0x3f;if ((count[0] += i << 3) < (long) (i << 3)) {count[1]++;}count[1] += i >>> 29;int l = 64 - k;int j;if (i >= l) {md5Memcpy(buffer, abyte0, k, 0, l);md5Transform(buffer);for (j = l; j + 63 < i; j += 64) {md5Memcpy(abyte1, abyte0, 0, j, 64);md5Transform(abyte1);}k = 0;} else {j = 0;}md5Memcpy(buffer, abyte0, k, j, i - j);}public static void main(String args[]) {MD5 md5 = new MD5();System.out.println("MD5 Test suite:");System.out.println("MD5(\"\"):" + md5.getMD5ofStr(""));System.out.println("MD5(\"a\"):" + md5.getMD5ofStr("a"));System.out.println("MD5(\"abc\"):" + md5.getMD5ofStr("abc"));System.out.println("MD5(\"message digest\"):" + md5.getMD5ofStr("message digest"));System.out.println("MD5(\"abcdefghijklmnopqrstuvwxyz\"):" + md5.getMD5ofStr("abcdefghijklmnopqrstuvwxyz"));System.out.println("MD5(\"8888\"):" + md5.getMD5ofStr("8888"));}}