是在猴哥和阿土的帮助下得到的,直接贴代码,原版只有一个入口是字符串入口,在实际使用中,此入口在计算文件的MD5时会有问题,所以我加了一个byte[]入口。 /*手机博客客户端.MD5码计算
开发:李果
开发开始日期:2006年5月8日
*/
public class MD5 { /* 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 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}; /* 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);
} return digestHexStr;
}
public String getMD5ofStr(byte[] inbuf)
{ md5Init(); md5Update(inbuf, inbuf.length); md5Final(); digestHexStr = ""; for (int i = 0; i < 16; i++) {
digestHexStr += byteHEX(digest);
} 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 MD5() {
md5Init();
} /* 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 */
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 & 0xffL); output[j + 1] = (byte) ((input >>> 8) & 0xffL); output[j + 2] = (byte) ((input >>> 16) & 0xffL); output[j + 3] = (byte) ((input >>> 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 = b2iu(input[j]) | (b2iu(input[j + 1]) << 8) | (b2iu(input[j + 2]) << 16) | (b2iu(input[j + 3]) << 24); return; } /* b2iu是一个把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) { /* if want to output normal letter please user DigitNormal */ char[] DigitNormal = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"}; /* if want to output capitalization letter please user DigitCap */ /* char[] DigitCap = { "0","1","2","3","4","5","6","7","8","9", "A","B","C","D","E","F" }; */ char[] ob = new char[2]; ob[0] = DigitNormal[(ib >>> 4) & 0X0F]; /* ob[0] = DigitCap[(ib >>> 4) & 0X0F]; */ ob[1] = DigitNormal[ib & 0X0F]; /* ob[1] = DigitCap[ib & 0X0F]; */ String s = new String(ob); return s;
}
public byte[] getMD5(byte[] data1 , byte[] data2) {
md5Init(); md5Update(data1, data1.length); md5Update(data2, data2.length); // md5Update(Request.key , Request.key.length); md5Final(); return digest;
} }
源码下载:http://203.93.208.26/kj/cwb/dir7/MD5.zip |