source: rtems/cpukit/libmd/md5.c @ b25b88e7

4.104.115
Last change on this file since b25b88e7 was b25b88e7, checked in by Ralf Corsepius <ralf.corsepius@…>, on 03/28/10 at 05:50:29

Add HAVE_CONFIG_H support to let files receive configure defines.

  • Property mode set to 100644
File size: 11.3 KB
Line 
1
2
3/*
4 ***********************************************************************
5 ** md5.c -- the source code for MD5 routines                         **
6 ** RSA Data Security, Inc. MD5 Message-Digest Algorithm              **
7 ** Created: 2/17/90 RLR                                              **
8 ** Revised: 1/91 SRD,AJ,BSK,JT Reference C ver., 7/10 constant corr. **
9 ***********************************************************************
10 */
11
12/*
13 ***********************************************************************
14 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved.  **
15 **                                                                   **
16 ** License to copy and use this software is granted provided that    **
17 ** it is identified as the "RSA Data Security, Inc. MD5 Message-     **
18 ** Digest Algorithm" in all material mentioning or referencing this  **
19 ** software or this function.                                        **
20 **                                                                   **
21 ** License is also granted to make and use derivative works          **
22 ** provided that such works are identified as "derived from the RSA  **
23 ** Data Security, Inc. MD5 Message-Digest Algorithm" in all          **
24 ** material mentioning or referencing the derived work.              **
25 **                                                                   **
26 ** RSA Data Security, Inc. makes no representations concerning       **
27 ** either the merchantability of this software or the suitability    **
28 ** of this software for any particular purpose.  It is provided "as  **
29 ** is" without express or implied warranty of any kind.              **
30 **                                                                   **
31 ** These notices must be retained in any copies of any part of this  **
32 ** documentation and/or software.                                    **
33 ***********************************************************************
34 */
35
36#ifdef HAVE_CONFIG_H
37#include "config.h"
38#endif
39
40#include <string.h>     /* memcpy */
41
42#include "md5.h"
43
44/*
45 ***********************************************************************
46 **  Message-digest routines:                                         **
47 **  To form the message digest for a message M                       **
48 **    (1) Initialize a context buffer mdContext using MD5Init        **
49 **    (2) Call MD5Update on mdContext and M                          **
50 **    (3) Call MD5Final on mdContext                                 **
51 **  The message digest is now in mdContext->digest[0...15]           **
52 ***********************************************************************
53 */
54
55/* forward declaration */
56static void Transform (UINT4 *buf, UINT4 *in);
57
58static unsigned char PADDING[64] = {
59  0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
60  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
61  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
62  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
63  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
64  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
65  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
66  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
67};
68
69/* F, G, H and I are basic MD5 functions */
70#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
71#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
72#define H(x, y, z) ((x) ^ (y) ^ (z))
73#define I(x, y, z) ((y) ^ ((x) | (~z)))
74
75/* ROTATE_LEFT rotates x left n bits */
76#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
77
78/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
79/* Rotation is separate from addition to prevent recomputation */
80#define FF(a, b, c, d, x, s, ac) \
81  {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
82   (a) = ROTATE_LEFT ((a), (s)); \
83   (a) += (b); \
84  }
85#define GG(a, b, c, d, x, s, ac) \
86  {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
87   (a) = ROTATE_LEFT ((a), (s)); \
88   (a) += (b); \
89  }
90#define HH(a, b, c, d, x, s, ac) \
91  {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
92   (a) = ROTATE_LEFT ((a), (s)); \
93   (a) += (b); \
94  }
95#define II(a, b, c, d, x, s, ac) \
96  {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
97   (a) = ROTATE_LEFT ((a), (s)); \
98   (a) += (b); \
99  }
100
101#ifdef __STDC__
102#define UL(x)   x##U
103#else
104#define UL(x)   x
105#endif
106
107/* The routine MD5Init initializes the message-digest context
108   mdContext. All fields are set to zero.
109 */
110void MD5Init (
111  MD5_CTX *mdContext )
112{
113  mdContext->i[0] = mdContext->i[1] = (UINT4)0;
114
115  /* Load magic initialization constants.
116   */
117  mdContext->buf[0] = (UINT4)0x67452301;
118  mdContext->buf[1] = (UINT4)0xefcdab89;
119  mdContext->buf[2] = (UINT4)0x98badcfe;
120  mdContext->buf[3] = (UINT4)0x10325476;
121}
122
123/* The routine MD5Update updates the message-digest context to
124   account for the presence of each of the characters inBuf[0..inLen-1]
125   in the message whose digest is being computed.
126 */
127void MD5Update (
128  MD5_CTX *mdContext,
129  const unsigned char *inBuf,
130  unsigned int inLen )
131{
132  UINT4 in[16];
133  int mdi;
134  unsigned int i, ii;
135
136  /* compute number of bytes mod 64 */
137  mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
138
139  /* update number of bits */
140  if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0])
141    mdContext->i[1]++;
142  mdContext->i[0] += ((UINT4)inLen << 3);
143  mdContext->i[1] += ((UINT4)inLen >> 29);
144
145  while (inLen--) {
146    /* add new character to buffer, increment mdi */
147    mdContext->in[mdi++] = *inBuf++;
148
149    /* transform if necessary */
150    if (mdi == 0x40) {
151      for (i = 0, ii = 0; i < 16; i++, ii += 4)
152        in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
153                (((UINT4)mdContext->in[ii+2]) << 16) |
154                (((UINT4)mdContext->in[ii+1]) << 8) |
155                ((UINT4)mdContext->in[ii]);
156      Transform (mdContext->buf, in);
157      mdi = 0;
158    }
159  }
160}
161
162/* The routine MD5Final terminates the message-digest computation and
163   ends with the desired message digest in mdContext->digest[0...15].
164 */
165void MD5Final (
166  unsigned char hash[],
167  MD5_CTX *mdContext )
168{
169  UINT4 in[16];
170  int mdi;
171  unsigned int i, ii;
172  unsigned int padLen;
173
174  /* save number of bits */
175  in[14] = mdContext->i[0];
176  in[15] = mdContext->i[1];
177
178  /* compute number of bytes mod 64 */
179  mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
180
181  /* pad out to 56 mod 64 */
182  padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
183  MD5Update (mdContext, PADDING, padLen);
184
185  /* append length in bits and transform */
186  for (i = 0, ii = 0; i < 14; i++, ii += 4)
187    in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
188            (((UINT4)mdContext->in[ii+2]) << 16) |
189            (((UINT4)mdContext->in[ii+1]) << 8) |
190            ((UINT4)mdContext->in[ii]);
191  Transform (mdContext->buf, in);
192
193  /* store buffer in digest */
194  for (i = 0, ii = 0; i < 4; i++, ii += 4) {
195    mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
196    mdContext->digest[ii+1] =
197      (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
198    mdContext->digest[ii+2] =
199      (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
200    mdContext->digest[ii+3] =
201      (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
202  }
203  memcpy(hash, mdContext->digest, 16);
204}
205
206/* Basic MD5 step. Transforms buf based on in.
207 */
208static void Transform (
209  UINT4 *buf,
210  UINT4 *in )
211{
212  UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
213
214  /* Round 1 */
215#define S11 7
216#define S12 12
217#define S13 17
218#define S14 22
219  FF ( a, b, c, d, in[ 0], S11, UL(3614090360)); /* 1 */
220  FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */
221  FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */
222  FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */
223  FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */
224  FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */
225  FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */
226  FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */
227  FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */
228  FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */
229  FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */
230  FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */
231  FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */
232  FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */
233  FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */
234  FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 16 */
235
236  /* Round 2 */
237#define S21 5
238#define S22 9
239#define S23 14
240#define S24 20
241  GG ( a, b, c, d, in[ 1], S21, UL(4129170786)); /* 17 */
242  GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */
243  GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */
244  GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */
245  GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */
246  GG ( d, a, b, c, in[10], S22, UL(  38016083)); /* 22 */
247  GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */
248  GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */
249  GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */
250  GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */
251  GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */
252  GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */
253  GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */
254  GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */
255  GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */
256  GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 32 */
257
258  /* Round 3 */
259#define S31 4
260#define S32 11
261#define S33 16
262#define S34 23
263  HH ( a, b, c, d, in[ 5], S31, UL(4294588738)); /* 33 */
264  HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */
265  HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */
266  HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */
267  HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */
268  HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */
269  HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */
270  HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */
271  HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */
272  HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */
273  HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */
274  HH ( b, c, d, a, in[ 6], S34, UL(  76029189)); /* 44 */
275  HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */
276  HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */
277  HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */
278  HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 48 */
279
280  /* Round 4 */
281#define S41 6
282#define S42 10
283#define S43 15
284#define S44 21
285  II ( a, b, c, d, in[ 0], S41, UL(4096336452)); /* 49 */
286  II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */
287  II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */
288  II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */
289  II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */
290  II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */
291  II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */
292  II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */
293  II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */
294  II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */
295  II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */
296  II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */
297  II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */
298  II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */
299  II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */
300  II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 64 */
301
302  buf[0] += a;
303  buf[1] += b;
304  buf[2] += c;
305  buf[3] += d;
306}
307
308/*
309 ***********************************************************************
310 ** End of md5.c                                                      **
311 ******************************** (cut) ********************************
312 */
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