source: Sophya/trunk/Poubelle/DPC:FitsIOServer/SysTools/md5.c

Last change on this file was 658, checked in by ansari, 26 years ago

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1/*
2 ***********************************************************************
3 ** md5.c -- the source code for MD5 routines **
4 ** RSA Data Security, Inc. MD5 Message-Digest Algorithm **
5 ** Created: 2/17/90 RLR **
6 ** Revised: 1/91 SRD,AJ,BSK,JT Reference C ver., 7/10 constant corr. **
7 ***********************************************************************
8 */
9
10/*
11 ***********************************************************************
12 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. **
13 ** **
14 ** License to copy and use this software is granted provided that **
15 ** it is identified as the "RSA Data Security, Inc. MD5 Message- **
16 ** Digest Algorithm" in all material mentioning or referencing this **
17 ** software or this function. **
18 ** **
19 ** License is also granted to make and use derivative works **
20 ** provided that such works are identified as "derived from the RSA **
21 ** Data Security, Inc. MD5 Message-Digest Algorithm" in all **
22 ** material mentioning or referencing the derived work. **
23 ** **
24 ** RSA Data Security, Inc. makes no representations concerning **
25 ** either the merchantability of this software or the suitability **
26 ** of this software for any particular purpose. It is provided "as **
27 ** is" without express or implied warranty of any kind. **
28 ** **
29 ** These notices must be retained in any copies of any part of this **
30 ** documentation and/or software. **
31 ***********************************************************************
32 */
33
34#include "md5.h"
35
36/*
37 ***********************************************************************
38 ** Message-digest routines: **
39 ** To form the message digest for a message M **
40 ** (1) Initialize a context buffer mdContext using MD5Init **
41 ** (2) Call MD5Update on mdContext and M **
42 ** (3) Call MD5Final on mdContext **
43 ** The message digest is now in mdContext->digest[0...15] **
44 ***********************************************************************
45 */
46
47/* forward declaration */
48static void Transform (UINT4 *buf, UINT4 *in);
49
50static unsigned char PADDING[64] = {
51 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
52 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
53 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
54 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
55 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
56 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
57 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
58 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
59};
60
61/* F, G, H and I are basic MD5 functions */
62#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
63#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
64#define H(x, y, z) ((x) ^ (y) ^ (z))
65#define I(x, y, z) ((y) ^ ((x) | (~z)))
66
67/* ROTATE_LEFT rotates x left n bits */
68#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
69
70/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
71/* Rotation is separate from addition to prevent recomputation */
72#define FF(a, b, c, d, x, s, ac) \
73 {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
74 (a) = ROTATE_LEFT ((a), (s)); \
75 (a) += (b); \
76 }
77#define GG(a, b, c, d, x, s, ac) \
78 {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
79 (a) = ROTATE_LEFT ((a), (s)); \
80 (a) += (b); \
81 }
82#define HH(a, b, c, d, x, s, ac) \
83 {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
84 (a) = ROTATE_LEFT ((a), (s)); \
85 (a) += (b); \
86 }
87#define II(a, b, c, d, x, s, ac) \
88 {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
89 (a) = ROTATE_LEFT ((a), (s)); \
90 (a) += (b); \
91 }
92
93/* The routine MD5Init initializes the message-digest context
94 mdContext. All fields are set to zero.
95 */
96void MD5Init (MD5_CTX *mdContext)
97{
98 mdContext->i[0] = mdContext->i[1] = (UINT4)0;
99
100 /* Load magic initialization constants.
101 */
102 mdContext->buf[0] = (UINT4)0x67452301;
103 mdContext->buf[1] = (UINT4)0xefcdab89;
104 mdContext->buf[2] = (UINT4)0x98badcfe;
105 mdContext->buf[3] = (UINT4)0x10325476;
106}
107
108/* The routine MD5Update updates the message-digest context to
109 account for the presence of each of the characters inBuf[0..inLen-1]
110 in the message whose digest is being computed.
111 */
112void MD5Update (MD5_CTX *mdContext, unsigned char *inBuf, unsigned short inLen)
113{
114 UINT4 in[16];
115 short mdi;
116 unsigned short i, ii;
117
118 /* compute number of bytes mod 64 */
119 mdi = (short)((mdContext->i[0] >> 3) & 0x3F);
120
121 /* update number of bits */
122 if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0])
123 mdContext->i[1]++;
124 mdContext->i[0] += ((UINT4)inLen << 3);
125 mdContext->i[1] += ((UINT4)inLen >> 29);
126
127 while (inLen--) {
128 /* add new character to buffer, increment mdi */
129 mdContext->in[mdi++] = *inBuf++;
130
131 /* transform if necessary */
132 if (mdi == 0x40) {
133 for (i = 0, ii = 0; i < 16; i++, ii += 4)
134 in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
135 (((UINT4)mdContext->in[ii+2]) << 16) |
136 (((UINT4)mdContext->in[ii+1]) << 8) |
137 ((UINT4)mdContext->in[ii]);
138 Transform (mdContext->buf, in);
139 mdi = 0;
140 }
141 }
142}
143
144/* The routine MD5Final terminates the message-digest computation and
145 ends with the desired message digest in mdContext->digest[0...15].
146 */
147void MD5Final (MD5_CTX *mdContext)
148{
149 UINT4 in[16];
150 short mdi;
151 unsigned short i, ii;
152 unsigned short padLen;
153
154 /* save number of bits */
155 in[14] = mdContext->i[0];
156 in[15] = mdContext->i[1];
157
158 /* compute number of bytes mod 64 */
159 mdi = (short)((mdContext->i[0] >> 3) & 0x3F);
160
161 /* pad out to 56 mod 64 */
162 padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
163 MD5Update (mdContext, PADDING, padLen);
164
165 /* append length in bits and transform */
166 for (i = 0, ii = 0; i < 14; i++, ii += 4)
167 in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
168 (((UINT4)mdContext->in[ii+2]) << 16) |
169 (((UINT4)mdContext->in[ii+1]) << 8) |
170 ((UINT4)mdContext->in[ii]);
171 Transform (mdContext->buf, in);
172
173 /* store buffer in digest */
174 for (i = 0, ii = 0; i < 4; i++, ii += 4) {
175 mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
176 mdContext->digest[ii+1] =
177 (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
178 mdContext->digest[ii+2] =
179 (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
180 mdContext->digest[ii+3] =
181 (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
182 }
183}
184
185/* Basic MD5 step. Transforms buf based on in.
186 */
187static void Transform (UINT4 *buf, UINT4 *in)
188{
189 UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
190
191 /* Round 1 */
192#define S11 7
193#define S12 12
194#define S13 17
195#define S14 22
196 FF ( a, b, c, d, in[ 0], S11, 3614090360); /* 1 */
197 FF ( d, a, b, c, in[ 1], S12, 3905402710); /* 2 */
198 FF ( c, d, a, b, in[ 2], S13, 606105819); /* 3 */
199 FF ( b, c, d, a, in[ 3], S14, 3250441966); /* 4 */
200 FF ( a, b, c, d, in[ 4], S11, 4118548399); /* 5 */
201 FF ( d, a, b, c, in[ 5], S12, 1200080426); /* 6 */
202 FF ( c, d, a, b, in[ 6], S13, 2821735955); /* 7 */
203 FF ( b, c, d, a, in[ 7], S14, 4249261313); /* 8 */
204 FF ( a, b, c, d, in[ 8], S11, 1770035416); /* 9 */
205 FF ( d, a, b, c, in[ 9], S12, 2336552879); /* 10 */
206 FF ( c, d, a, b, in[10], S13, 4294925233); /* 11 */
207 FF ( b, c, d, a, in[11], S14, 2304563134); /* 12 */
208 FF ( a, b, c, d, in[12], S11, 1804603682); /* 13 */
209 FF ( d, a, b, c, in[13], S12, 4254626195); /* 14 */
210 FF ( c, d, a, b, in[14], S13, 2792965006); /* 15 */
211 FF ( b, c, d, a, in[15], S14, 1236535329); /* 16 */
212
213 /* Round 2 */
214#define S21 5
215#define S22 9
216#define S23 14
217#define S24 20
218 GG ( a, b, c, d, in[ 1], S21, 4129170786); /* 17 */
219 GG ( d, a, b, c, in[ 6], S22, 3225465664); /* 18 */
220 GG ( c, d, a, b, in[11], S23, 643717713); /* 19 */
221 GG ( b, c, d, a, in[ 0], S24, 3921069994); /* 20 */
222 GG ( a, b, c, d, in[ 5], S21, 3593408605); /* 21 */
223 GG ( d, a, b, c, in[10], S22, 38016083); /* 22 */
224 GG ( c, d, a, b, in[15], S23, 3634488961); /* 23 */
225 GG ( b, c, d, a, in[ 4], S24, 3889429448); /* 24 */
226 GG ( a, b, c, d, in[ 9], S21, 568446438); /* 25 */
227 GG ( d, a, b, c, in[14], S22, 3275163606); /* 26 */
228 GG ( c, d, a, b, in[ 3], S23, 4107603335); /* 27 */
229 GG ( b, c, d, a, in[ 8], S24, 1163531501); /* 28 */
230 GG ( a, b, c, d, in[13], S21, 2850285829); /* 29 */
231 GG ( d, a, b, c, in[ 2], S22, 4243563512); /* 30 */
232 GG ( c, d, a, b, in[ 7], S23, 1735328473); /* 31 */
233 GG ( b, c, d, a, in[12], S24, 2368359562); /* 32 */
234
235 /* Round 3 */
236#define S31 4
237#define S32 11
238#define S33 16
239#define S34 23
240 HH ( a, b, c, d, in[ 5], S31, 4294588738); /* 33 */
241 HH ( d, a, b, c, in[ 8], S32, 2272392833); /* 34 */
242 HH ( c, d, a, b, in[11], S33, 1839030562); /* 35 */
243 HH ( b, c, d, a, in[14], S34, 4259657740); /* 36 */
244 HH ( a, b, c, d, in[ 1], S31, 2763975236); /* 37 */
245 HH ( d, a, b, c, in[ 4], S32, 1272893353); /* 38 */
246 HH ( c, d, a, b, in[ 7], S33, 4139469664); /* 39 */
247 HH ( b, c, d, a, in[10], S34, 3200236656); /* 40 */
248 HH ( a, b, c, d, in[13], S31, 681279174); /* 41 */
249 HH ( d, a, b, c, in[ 0], S32, 3936430074); /* 42 */
250 HH ( c, d, a, b, in[ 3], S33, 3572445317); /* 43 */
251 HH ( b, c, d, a, in[ 6], S34, 76029189); /* 44 */
252 HH ( a, b, c, d, in[ 9], S31, 3654602809); /* 45 */
253 HH ( d, a, b, c, in[12], S32, 3873151461); /* 46 */
254 HH ( c, d, a, b, in[15], S33, 530742520); /* 47 */
255 HH ( b, c, d, a, in[ 2], S34, 3299628645); /* 48 */
256
257 /* Round 4 */
258#define S41 6
259#define S42 10
260#define S43 15
261#define S44 21
262 II ( a, b, c, d, in[ 0], S41, 4096336452); /* 49 */
263 II ( d, a, b, c, in[ 7], S42, 1126891415); /* 50 */
264 II ( c, d, a, b, in[14], S43, 2878612391); /* 51 */
265 II ( b, c, d, a, in[ 5], S44, 4237533241); /* 52 */
266 II ( a, b, c, d, in[12], S41, 1700485571); /* 53 */
267 II ( d, a, b, c, in[ 3], S42, 2399980690); /* 54 */
268 II ( c, d, a, b, in[10], S43, 4293915773); /* 55 */
269 II ( b, c, d, a, in[ 1], S44, 2240044497); /* 56 */
270 II ( a, b, c, d, in[ 8], S41, 1873313359); /* 57 */
271 II ( d, a, b, c, in[15], S42, 4264355552); /* 58 */
272 II ( c, d, a, b, in[ 6], S43, 2734768916); /* 59 */
273 II ( b, c, d, a, in[13], S44, 1309151649); /* 60 */
274 II ( a, b, c, d, in[ 4], S41, 4149444226); /* 61 */
275 II ( d, a, b, c, in[11], S42, 3174756917); /* 62 */
276 II ( c, d, a, b, in[ 2], S43, 718787259); /* 63 */
277 II ( b, c, d, a, in[ 9], S44, 3951481745); /* 64 */
278
279 buf[0] += a;
280 buf[1] += b;
281 buf[2] += c;
282 buf[3] += d;
283}
284
285/*
286 ***********************************************************************
287 ** End of md5.c **
288 ******************************** (cut) ********************************
289 */
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