1 /************************************************
2 MD5 算法的Java Bean
3 @author:Topcat Tuppin
4 Last Modified:10,Mar,2001
5 *************************************************/
6 import java.lang.reflect.*;
7 /*************************************************
8 md5 类实现了RSA Data Security, Inc.在提交给IETF
9 的RFC1321中的MD5 message-digest 算法。
10 *************************************************/
11
12 public class MD5 {
13 /* 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，
14 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
15 Instance间共享*/
16 static final int S11 = 7;
17 static final int S12 = 12;
18 static final int S13 = 17;
19 static final int S14 = 22;
20
21 static final int S21 = 5;
22 static final int S22 = 9;
23 static final int S23 = 14;
24 static final int S24 = 20;
25
26 static final int S31 = 4;
27 static final int S32 = 11;
28 static final int S33 = 16;
29 static final int S34 = 23;
30
31 static final int S41 = 6;
32 static final int S42 = 10;
33 static final int S43 = 15;
34 static final int S44 = 21;
35
36 static final byte[] PADDING = { -128, 0, 0, 0, 0, 0, 0, 0, 0,
37 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
38 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
39 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
40 /* 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
41 被定义到MD5_CTX结构中
42
43 */
44 private long[] state = new long[4]; // state (ABCD)
45 private long[] count = new long[2]; // number of bits, modulo 2^64 (lsb first)
46 private byte[] buffer = new byte[64]; // input buffer
47
48 /* digestHexStr是MD5的唯一一个公共成员，是最新一次计算结果的
49 16进制ASCII表示.
50 */
51 public String digestHexStr;
52
53 /* digest,是最新一次计算结果的2进制内部表示，表示128bit的MD5值.
54 */
55 private byte[] digest = new byte[16];
56
57 /*
58 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
59 返回的是变换完的结果，这个结果是从公共成员digestHexStr取得的．
60 */
61 public String getMD5ofStr(String inbuf) {
62 md5Init();
63 md5Update(inbuf.getBytes(), inbuf.length());
64 md5Final();
65 digestHexStr = "";
66 for (int i = 0; i < 16; i++) {
67 digestHexStr += byteHEX(digest[i]);
68 }
69 return digestHexStr;
70
71 }
72 // 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
73 public MD5() {
74 md5Init();
75
76 return;
77 }
78
79
80
81 /* md5Init是一个初始化函数，初始化核心变量，装入标准的幻数 */
82 private void md5Init() {
83 count[0] = 0L;
84 count[1] = 0L;
85 ///* Load magic initialization constants.
86
87 state[0] = 0x67452301L;
88 state[1] = 0xefcdab89L;
89 state[2] = 0x98badcfeL;
90 state[3] = 0x10325476L;
91
92 return;
93 }
94 /* 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
95 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
96 实现成了private方法，名字保持了原来C中的。 */
97
98 private long F(long x, long y, long z) {
99 return (x & y) | ((~x) & z);
100
101 }
102 private long G(long x, long y, long z) {
103 return (x & z) | (y & (~z));
104
105 }
106 private long H(long x, long y, long z) {
107 return x ^ y ^ z;
108 }
109
110 private long I(long x, long y, long z) {
111 return y ^ (x | (~z));
112 }
113
114 /*
115 FF,GG,HH和II将调用F,G,H,I进行近一步变换
116 FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
117 Rotation is separate from addition to prevent recomputation.
118 */
119
120 private long FF(long a, long b, long c, long d, long x, long s,
121 long ac) {
122 a += F (b, c, d) + x + ac;
123 a = ((int) a << s) | ((int) a >>> (32 - s));
124 a += b;
125 return a;
126 }
127
128 private long GG(long a, long b, long c, long d, long x, long s,
129 long ac) {
130 a += G (b, c, d) + x + ac;
131 a = ((int) a << s) | ((int) a >>> (32 - s));
132 a += b;
133 return a;
134 }
135 private long HH(long a, long b, long c, long d, long x, long s,
136 long ac) {
137 a += H (b, c, d) + x + ac;
138 a = ((int) a << s) | ((int) a >>> (32 - s));
139 a += b;
140 return a;
141 }
142 private long II(long a, long b, long c, long d, long x, long s,
143 long ac) {
144 a += I (b, c, d) + x + ac;
145 a = ((int) a << s) | ((int) a >>> (32 - s));
146 a += b;
147 return a;
148 }
149 /*
150 md5Update是MD5的主计算过程，inbuf是要变换的字节串，inputlen是长度，这个
151 函数由getMD5ofStr调用，调用之前需要调用md5init，因此把它设计成private的
152 */
153 private void md5Update(byte[] inbuf, int inputLen) {
154
155 int i, index, partLen;
156 byte[] block = new byte[64];
157 index = (int)(count[0] >>> 3) & 0x3F;
158 // /* Update number of bits */
159 if ((count[0] += (inputLen << 3)) < (inputLen << 3))
160 count[1]++;
161 count[1] += (inputLen >>> 29);
162
163 partLen = 64 - index;
164
165 // Transform as many times as possible.
166 if (inputLen >= partLen) {
167 md5Memcpy(buffer, inbuf, index, 0, partLen);
168 md5Transform(buffer);
169
170 for (i = partLen; i + 63 < inputLen; i += 64) {
171
172 md5Memcpy(block, inbuf, 0, i, 64);
173 md5Transform (block);
174 }
175 index = 0;
176
177 } else
178
179 i = 0;
180
181 ///* Buffer remaining input */
182 md5Memcpy(buffer, inbuf, index, i, inputLen - i);
183
184 }
185
186 /*
187 md5Final整理和填写输出结果
188 */
189 private void md5Final () {
190 byte[] bits = new byte[8];
191 int index, padLen;
192
193 ///* Save number of bits */
194 Encode (bits, count, 8);
195
196 ///* Pad out to 56 mod 64.
197 index = (int)(count[0] >>> 3) & 0x3f;
198 padLen = (index < 56) ? (56 - index) : (120 - index);
199 md5Update (PADDING, padLen);
200
201 ///* Append length (before padding) */
202 md5Update(bits, 8);
203
204 ///* Store state in digest */
205 Encode (digest, state, 16);
206
207 }
208
209 /* 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
210 字节拷贝到output的outpos位置开始
211 */
212
213 private void md5Memcpy (byte[] output, byte[] input,
214 int outpos, int inpos, int len)
215 {
216 int i;
217
218 for (i = 0; i < len; i++)
219 output[outpos + i] = input[inpos + i];
220 }
221
222 /*
223 md5Transform是MD5核心变换程序，有md5Update调用，block是分块的原始字节
224 */
225 private void md5Transform (byte block[]) {
226 long a = state[0], b = state[1], c = state[2], d = state[3];
227 long[] x = new long[16];
228
229 Decode (x, block, 64);
230
231 /* Round 1 */
232 a = FF (a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */
233 d = FF (d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */
234 c = FF (c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */
235 b = FF (b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */
236 a = FF (a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */
237 d = FF (d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */
238 c = FF (c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */
239 b = FF (b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */
240 a = FF (a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */
241 d = FF (d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */
242 c = FF (c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */
243 b = FF (b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */
244 a = FF (a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */
245 d = FF (d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */
246 c = FF (c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */
247 b = FF (b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */
248
249 /* Round 2 */
250 a = GG (a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */
251 d = GG (d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */
252 c = GG (c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */
253 b = GG (b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */
254 a = GG (a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */
255 d = GG (d, a, b, c, x[10], S22, 0x2441453L); /* 22 */
256 c = GG (c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */
257 b = GG (b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */
258 a = GG (a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */
259 d = GG (d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */
260 c = GG (c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */
261 b = GG (b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */
262 a = GG (a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */
263 d = GG (d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */
264 c = GG (c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */
265 b = GG (b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */
266
267 /* Round 3 */
268 a = HH (a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */
269 d = HH (d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */
270 c = HH (c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */
271 b = HH (b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */
272 a = HH (a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */
273 d = HH (d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */
274 c = HH (c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */
275 b = HH (b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */
276 a = HH (a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */
277 d = HH (d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */
278 c = HH (c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */
279 b = HH (b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */
280 a = HH (a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */
281 d = HH (d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */
282 c = HH (c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */
283 b = HH (b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */
284
285 /* Round 4 */
286 a = II (a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */
287 d = II (d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */
288 c = II (c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */
289 b = II (b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */
290 a = II (a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */
291 d = II (d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */
292 c = II (c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */
293 b = II (b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */
294 a = II (a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */
295 d = II (d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */
296 c = II (c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */
297 b = II (b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */
298 a = II (a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */
299 d = II (d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */
300 c = II (c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */
301 b = II (b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */
302
303 state[0] += a;
304 state[1] += b;
305 state[2] += c;
306 state[3] += d;
307
308 }
309
310 /*Encode把long数组按顺序拆成byte数组，因为java的long类型是64bit的，
311 只拆低32bit，以适应原始C实现的用途
312 */
313 private void Encode (byte[] output, long[] input, int len) {
314 int i, j;
315
316 for (i = 0, j = 0; j < len; i++, j += 4) {
317 output[j] = (byte)(input[i] & 0xffL);
318 output[j + 1] = (byte)((input[i] >>> 8) & 0xffL);
319 output[j + 2] = (byte)((input[i] >>> 16) & 0xffL);
320 output[j + 3] = (byte)((input[i] >>> 24) & 0xffL);
321 }
322 }
323
324 /*Decode把byte数组按顺序合成成long数组，因为java的long类型是64bit的，
325 只合成低32bit，高32bit清零，以适应原始C实现的用途
326 */
327 private void Decode (long[] output, byte[] input, int len) {
328 int i, j;
329
330
331 for (i = 0, j = 0; j < len; i++, j += 4)
332 output[i] = b2iu(input[j]) |
333 (b2iu(input[j + 1]) << 8) |
334 (b2iu(input[j + 2]) << 16) |
335 (b2iu(input[j + 3]) << 24);
336
337 return;
338 }
339
340 /*
341 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
342 */
343 public static long b2iu(byte b) {
344 return b < 0 ? b & 0x7F + 128 : b;
345 }
346
347 /*byteHEX()，用来把一个byte类型的数转换成十六进制的ASCII表示，
348 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
349 sprintf(outbuf,"%02X",ib)
350 */
351 public static String byteHEX(byte ib) {
352 char[] Digit = { '0','1','2','3','4','5','6','7','8','9',
353 'A','B','C','D','E','F' };
354 char [] ob = new char[2];
355 ob[0] = Digit[(ib >>> 4) & 0X0F];
356 ob[1] = Digit[ib & 0X0F];
357 String s = new String(ob);
358 return s;
359 }
360
361 public static void main(String args[]) {
362
363
364 MD5 m = new MD5();
365 if (Array.getLength(args) == 0) { //如果没有参数，执行标准的Test Suite
366
367 System.out.println("MD5 Test suite:");
368 System.out.println("MD5(\"\"):"+m.getMD5ofStr(""));
369 System.out.println("MD5(\"a\"):"+m.getMD5ofStr("a"));
370 System.out.println("MD5(\"abc\"):"+m.getMD5ofStr("abc"));
371 System.out.println("MD5(\"message digest\"):"+m.getMD5ofStr("message digest"));
372 System.out.println("MD5(\"abcdefghijklmnopqrstuvwxyz\"):"+
373 m.getMD5ofStr("abcdefghijklmnopqrstuvwxyz"));
374 System.out.println("MD5(\"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789\"):"+
375 m.getMD5ofStr("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"));
376 }
377 else
378 System.out.println("MD5(" + args[0] + ")=" + m.getMD5ofStr(args[0]));
379
380
381 }
382
383 }
posted on 2006-06-29 15:23
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