source: rtems/cpukit/pppd/md5.c @ c55df85

4.104.114.84.95
Last change on this file since c55df85 was d0950ad, checked in by Joel Sherrill <joel.sherrill@…>, on 11/30/99 at 22:12:50

Added port of ppp-2.3.5 from Tomasz Domin <dot@…> of ComArch? SA.
Tomasz only tested this on the mpc823.

The official site for the original source for this PPP implementation is:

​ftp://cs.anu.edu.au/pub/software/ppp

NOTE: As of 11/30/1999, the current version of this source is 2.3.10.
  • 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#include "md5.h"
37
38/*
39 ***********************************************************************
40 **  Message-digest routines:                                         **
41 **  To form the message digest for a message M                       **
42 **    (1) Initialize a context buffer mdContext using MD5Init        **
43 **    (2) Call MD5Update on mdContext and M                          **
44 **    (3) Call MD5Final on mdContext                                 **
45 **  The message digest is now in mdContext->digest[0...15]           **
46 ***********************************************************************
47 */
48
49/* forward declaration */
50static void Transform ();
51
52static unsigned char PADDING[64] = {
53  0x80, 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  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
60  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
61};
62
63/* F, G, H and I are basic MD5 functions */
64#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
65#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
66#define H(x, y, z) ((x) ^ (y) ^ (z))
67#define I(x, y, z) ((y) ^ ((x) | (~z)))
68
69/* ROTATE_LEFT rotates x left n bits */
70#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
71
72/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
73/* Rotation is separate from addition to prevent recomputation */
74#define FF(a, b, c, d, x, s, ac) \
75  {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
76   (a) = ROTATE_LEFT ((a), (s)); \
77   (a) += (b); \
78  }
79#define GG(a, b, c, d, x, s, ac) \
80  {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
81   (a) = ROTATE_LEFT ((a), (s)); \
82   (a) += (b); \
83  }
84#define HH(a, b, c, d, x, s, ac) \
85  {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
86   (a) = ROTATE_LEFT ((a), (s)); \
87   (a) += (b); \
88  }
89#define II(a, b, c, d, x, s, ac) \
90  {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
91   (a) = ROTATE_LEFT ((a), (s)); \
92   (a) += (b); \
93  }
94
95#ifdef __STDC__
96#define UL(x)   x##U
97#else
98#define UL(x)   x
99#endif
100
101/* The routine MD5Init initializes the message-digest context
102   mdContext. All fields are set to zero.
103 */
104void MD5Init (mdContext)
105MD5_CTX *mdContext;
106{
107  mdContext->i[0] = mdContext->i[1] = (UINT4)0;
108
109  /* Load magic initialization constants.
110   */
111  mdContext->buf[0] = (UINT4)0x67452301;
112  mdContext->buf[1] = (UINT4)0xefcdab89;
113  mdContext->buf[2] = (UINT4)0x98badcfe;
114  mdContext->buf[3] = (UINT4)0x10325476;
115}
116
117/* The routine MD5Update updates the message-digest context to
118   account for the presence of each of the characters inBuf[0..inLen-1]
119   in the message whose digest is being computed.
120 */
121void MD5Update (mdContext, inBuf, inLen)
122MD5_CTX *mdContext;
123unsigned char *inBuf;
124unsigned int inLen;
125{
126  UINT4 in[16];
127  int mdi;
128  unsigned int i, ii;
129
130  /* compute number of bytes mod 64 */
131  mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
132
133  /* update number of bits */
134  if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0])
135    mdContext->i[1]++;
136  mdContext->i[0] += ((UINT4)inLen << 3);
137  mdContext->i[1] += ((UINT4)inLen >> 29);
138
139  while (inLen--) {
140    /* add new character to buffer, increment mdi */
141    mdContext->in[mdi++] = *inBuf++;
142
143    /* transform if necessary */
144    if (mdi == 0x40) {
145      for (i = 0, ii = 0; i < 16; i++, ii += 4)
146        in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
147                (((UINT4)mdContext->in[ii+2]) << 16) |
148                (((UINT4)mdContext->in[ii+1]) << 8) |
149                ((UINT4)mdContext->in[ii]);
150      Transform (mdContext->buf, in);
151      mdi = 0;
152    }
153  }
154}
155
156/* The routine MD5Final terminates the message-digest computation and
157   ends with the desired message digest in mdContext->digest[0...15].
158 */
159void MD5Final (hash, mdContext)
160unsigned char hash[];
161MD5_CTX *mdContext;
162{
163  UINT4 in[16];
164  int mdi;
165  unsigned int i, ii;
166  unsigned int padLen;
167
168  /* save number of bits */
169  in[14] = mdContext->i[0];
170  in[15] = mdContext->i[1];
171
172  /* compute number of bytes mod 64 */
173  mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
174
175  /* pad out to 56 mod 64 */
176  padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
177  MD5Update (mdContext, PADDING, padLen);
178
179  /* append length in bits and transform */
180  for (i = 0, ii = 0; i < 14; i++, ii += 4)
181    in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
182            (((UINT4)mdContext->in[ii+2]) << 16) |
183            (((UINT4)mdContext->in[ii+1]) << 8) |
184            ((UINT4)mdContext->in[ii]);
185  Transform (mdContext->buf, in);
186
187  /* store buffer in digest */
188  for (i = 0, ii = 0; i < 4; i++, ii += 4) {
189    mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
190    mdContext->digest[ii+1] =
191      (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
192    mdContext->digest[ii+2] =
193      (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
194    mdContext->digest[ii+3] =
195      (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
196  }
197  memcpy(hash, mdContext->digest, 16);
198}
199
200/* Basic MD5 step. Transforms buf based on in.
201 */
202static void Transform (buf, in)
203UINT4 *buf;
204UINT4 *in;
205{
206  UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
207
208  /* Round 1 */
209#define S11 7
210#define S12 12
211#define S13 17
212#define S14 22
213  FF ( a, b, c, d, in[ 0], S11, UL(3614090360)); /* 1 */
214  FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */
215  FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */
216  FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */
217  FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */
218  FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */
219  FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */
220  FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */
221  FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */
222  FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */
223  FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */
224  FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */
225  FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */
226  FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */
227  FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */
228  FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 16 */
229
230  /* Round 2 */
231#define S21 5
232#define S22 9
233#define S23 14
234#define S24 20
235  GG ( a, b, c, d, in[ 1], S21, UL(4129170786)); /* 17 */
236  GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */
237  GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */
238  GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */
239  GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */
240  GG ( d, a, b, c, in[10], S22, UL(  38016083)); /* 22 */
241  GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */
242  GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */
243  GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */
244  GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */
245  GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */
246  GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */
247  GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */
248  GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */
249  GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */
250  GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 32 */
251
252  /* Round 3 */
253#define S31 4
254#define S32 11
255#define S33 16
256#define S34 23
257  HH ( a, b, c, d, in[ 5], S31, UL(4294588738)); /* 33 */
258  HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */
259  HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */
260  HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */
261  HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */
262  HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */
263  HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */
264  HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */
265  HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */
266  HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */
267  HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */
268  HH ( b, c, d, a, in[ 6], S34, UL(  76029189)); /* 44 */
269  HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */
270  HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */
271  HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */
272  HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 48 */
273
274  /* Round 4 */
275#define S41 6
276#define S42 10
277#define S43 15
278#define S44 21
279  II ( a, b, c, d, in[ 0], S41, UL(4096336452)); /* 49 */
280  II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */
281  II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */
282  II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */
283  II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */
284  II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */
285  II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */
286  II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */
287  II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */
288  II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */
289  II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */
290  II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */
291  II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */
292  II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */
293  II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */
294  II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 64 */
295
296  buf[0] += a;
297  buf[1] += b;
298  buf[2] += c;
299  buf[3] += d;
300}
301
302/*
303 ***********************************************************************
304 ** End of md5.c                                                      **
305 ******************************** (cut) ********************************
306 */
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