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Posted on 2006-11-09 20:54 neter 阅读(419) 评论(0) 编辑 收藏 引用 所属分类: 程序设计
http://www.ietf.org/rfc/rfc1321.txt 此为rfc1321.txt
1 #include <stdio.h>
2
3  typedef struct  {
4
5 unsigned int state[4];
6
7 unsigned int count[2];
8
9 unsigned char buffer[64];
10
11 } MD5Context;
12
13
14
15void MD5_Init(MD5Context * context);
16
17void MD5_Update(MD5Context * context, unsigned char * buf, int len);
18
19void MD5_Final(MD5Context * context, unsigned char digest[16]);
20
21#define S11 7
22
23#define S12 12
24
25#define S13 17
26
27#define S14 22
28
29#define S21 5
30
31#define S22 9
32
33#define S23 14
34
35#define S24 20
36
37#define S31 4
38
39#define S32 11
40
41#define S33 16
42
43#define S34 23
44
45#define S41 6
46
47#define S42 10
48
49#define S43 15
50
51#define S44 21
52
53
54
55static unsigned char PADDING[64] =
56
57{
58
59 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
60
61 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
62
63 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
64
65};
66
67#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
68
69#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
70
71#define H(x, y, z) ((x) ^ (y) ^ (z))
72
73#define I(x, y, z) ((y) ^ ((x) | (~z)))
74
75
76
77#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
78
79
80
81#define FF(a, b, c, d, x, s, ac) \
82
83 { \
84
85 (a) += F((b), (c), (d)) + (x) + (unsigned int)(ac); \
86
87 (a) = ROTATE_LEFT((a), (s)); \
88
89 (a) += (b); \
90
91 }
92
93
94
95#define GG(a, b, c, d, x, s, ac) \
96
97 { \
98
99 (a) += G((b), (c), (d)) + (x) + (unsigned int)(ac); \
100
101 (a) = ROTATE_LEFT((a), (s)); \
102
103 (a) += (b); \
104
105 }
106
107
108
109#define HH(a, b, c, d, x, s, ac) \
110
111 { \
112
113 (a) += H((b), (c), (d)) + (x) + (unsigned int)(ac); \
114
115 (a) = ROTATE_LEFT((a), (s)); \
116
117 (a) += (b); \
118
119 }
120
121
122
123#define II(a, b, c, d, x, s, ac) \
124
125 { \
126
127 (a) += I((b), (c), (d)) + (x) + (unsigned int)(ac); \
128
129 (a) = ROTATE_LEFT((a), (s)); \
130
131 (a) += (b); \
132
133 }
134
135static void MD5_Encode(unsigned char * output, unsigned int * input, int len)
136
137{
138
139 unsigned int i, j;
140
141
142
143 for (i = 0, j = 0; j < len; i++, j += 4)
144
145  {
146
147 output[j] = (unsigned char) (input[i] & 0xff);
148
149 output[j + 1] = (unsigned char) ((input[i] >> 8) & 0xff);
150
151 output[j + 2] = (unsigned char) ((input[i] >> 16) & 0xff);
152
153 output[j + 3] = (unsigned char) ((input[i] >> 24) & 0xff);
154
155 }
156
157}
158
159
160
161static void MD5_Decode(unsigned int * output, unsigned char * input, int len)
162
163{
164
165 unsigned int i, j;
166
167
168
169 for (i = 0, j = 0; j < len; i++, j += 4)
170
171 {
172
173 output[i] = ((unsigned int) input[j]) |
174
175 (((unsigned int) input[j + 1]) << 8) |
176
177 (((unsigned int) input[j + 2]) << 16) |
178
179 (((unsigned int) input[j + 3]) << 24);
180
181 }
182
183}
184
185
186
187static void MD5_Transform(unsigned int state[4], unsigned char block[64])
188
189{
190
191 unsigned int a = state[0], b = state[1], c = state[2], d = state[3], x[16];
192
193
194
195 MD5_Decode(x, block, 64);
196
197
198
199 /**//* Round 1 */
200
201 FF(a, b, c, d, x[0], S11, 0xd76aa478); /**//* 1 */
202
203 FF(d, a, b, c, x[1], S12, 0xe8c7b756); /**//* 2 */
204
205 FF(c, d, a, b, x[2], S13, 0x242070db); /**//* 3 */
206
207 FF(b, c, d, a, x[3], S14, 0xc1bdceee); /**//* 4 */
208
209 FF(a, b, c, d, x[4], S11, 0xf57c0faf); /**//* 5 */
210
211 FF(d, a, b, c, x[5], S12, 0x4787c62a); /**//* 6 */
212
213 FF(c, d, a, b, x[6], S13, 0xa8304613); /**//* 7 */
214
215 FF(b, c, d, a, x[7], S14, 0xfd469501); /**//* 8 */
216
217 FF(a, b, c, d, x[8], S11, 0x698098d8); /**//* 9 */
218
219 FF(d, a, b, c, x[9], S12, 0x8b44f7af); /**//* 10 */
220
221 FF(c, d, a, b, x[10], S13, 0xffff5bb1); /**//* 11 */
222
223 FF(b, c, d, a, x[11], S14, 0x895cd7be); /**//* 12 */
224
225 FF(a, b, c, d, x[12], S11, 0x6b901122); /**//* 13 */
226
227 FF(d, a, b, c, x[13], S12, 0xfd987193); /**//* 14 */
228
229 FF(c, d, a, b, x[14], S13, 0xa679438e); /**//* 15 */
230
231 FF(b, c, d, a, x[15], S14, 0x49b40821); /**//* 16 */
232
233
234
235 /**//* Round 2 */
236
237 GG(a, b, c, d, x[1], S21, 0xf61e2562); /**//* 17 */
238
239 GG(d, a, b, c, x[6], S22, 0xc040b340); /**//* 18 */
240
241 GG(c, d, a, b, x[11], S23, 0x265e5a51); /**//* 19 */
242
243 GG(b, c, d, a, x[0], S24, 0xe9b6c7aa); /**//* 20 */
244
245 GG(a, b, c, d, x[5], S21, 0xd62f105d); /**//* 21 */
246
247 GG(d, a, b, c, x[10], S22, 0x2441453); /**//* 22 */
248
249 GG(c, d, a, b, x[15], S23, 0xd8a1e681); /**//* 23 */
250
251 GG(b, c, d, a, x[4], S24, 0xe7d3fbc8); /**//* 24 */
252
253 GG(a, b, c, d, x[9], S21, 0x21e1cde6); /**//* 25 */
254
255 GG(d, a, b, c, x[14], S22, 0xc33707d6); /**//* 26 */
256
257 GG(c, d, a, b, x[3], S23, 0xf4d50d87); /**//* 27 */
258
259 GG(b, c, d, a, x[8], S24, 0x455a14ed); /**//* 28 */
260
261 GG(a, b, c, d, x[13], S21, 0xa9e3e905); /**//* 29 */
262
263 GG(d, a, b, c, x[2], S22, 0xfcefa3f8); /**//* 30 */
264
265 GG(c, d, a, b, x[7], S23, 0x676f02d9); /**//* 31 */
266
267 GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /**//* 32 */
268
269
270
271 /**//* Round 3 */
272
273 HH(a, b, c, d, x[5], S31, 0xfffa3942); /**//* 33 */
274
275 HH(d, a, b, c, x[8], S32, 0x8771f681); /**//* 34 */
276
277 HH(c, d, a, b, x[11], S33, 0x6d9d6122); /**//* 35 */
278
279 HH(b, c, d, a, x[14], S34, 0xfde5380c); /**//* 36 */
280
281 HH(a, b, c, d, x[1], S31, 0xa4beea44); /**//* 37 */
282
283 HH(d, a, b, c, x[4], S32, 0x4bdecfa9); /**//* 38 */
284
285 HH(c, d, a, b, x[7], S33, 0xf6bb4b60); /**//* 39 */
286
287 HH(b, c, d, a, x[10], S34, 0xbebfbc70); /**//* 40 */
288
289 HH(a, b, c, d, x[13], S31, 0x289b7ec6); /**//* 41 */
290
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