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1 583 jeremybenn
/*
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 "ppp.h"
35
#include "md5.h"
36
#include "pppdebug.h"
37
 
38
#if CHAP_SUPPORT > 0 || MD5_SUPPORT > 0
39
 
40
/*
41
 ***********************************************************************
42
 **  Message-digest routines:                                         **
43
 **  To form the message digest for a message M                       **
44
 **    (1) Initialize a context buffer mdContext using MD5Init        **
45
 **    (2) Call MD5Update on mdContext and M                          **
46
 **    (3) Call MD5Final on mdContext                                 **
47
 **  The message digest is now in mdContext->digest[0...15]           **
48
 ***********************************************************************
49
 */
50
 
51
/* forward declaration */
52
static void Transform (u32_t *buf, u32_t *in);
53
 
54
static unsigned char PADDING[64] = {
55
  0x80, 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
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
62
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
63
};
64
 
65
/* F, G, H and I are basic MD5 functions */
66
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
67
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
68
#define H(x, y, z) ((x) ^ (y) ^ (z))
69
#define I(x, y, z) ((y) ^ ((x) | (~z)))
70
 
71
/* ROTATE_LEFT rotates x left n bits */
72
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
73
 
74
/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
75
/* Rotation is separate from addition to prevent recomputation */
76
#define FF(a, b, c, d, x, s, ac) \
77
  {(a) += F ((b), (c), (d)) + (x) + (u32_t)(ac); \
78
   (a) = ROTATE_LEFT ((a), (s)); \
79
   (a) += (b); \
80
  }
81
#define GG(a, b, c, d, x, s, ac) \
82
  {(a) += G ((b), (c), (d)) + (x) + (u32_t)(ac); \
83
   (a) = ROTATE_LEFT ((a), (s)); \
84
   (a) += (b); \
85
  }
86
#define HH(a, b, c, d, x, s, ac) \
87
  {(a) += H ((b), (c), (d)) + (x) + (u32_t)(ac); \
88
   (a) = ROTATE_LEFT ((a), (s)); \
89
   (a) += (b); \
90
  }
91
#define II(a, b, c, d, x, s, ac) \
92
  {(a) += I ((b), (c), (d)) + (x) + (u32_t)(ac); \
93
   (a) = ROTATE_LEFT ((a), (s)); \
94
   (a) += (b); \
95
  }
96
 
97
#ifdef __STDC__
98
#define UL(x)   x##UL
99
#else
100
#ifdef WIN32
101
#define UL(x)   x##UL
102
#else
103
#define UL(x)   x
104
#endif
105
#endif
106
 
107
/* The routine MD5Init initializes the message-digest context
108
   mdContext. All fields are set to zero.
109
 */
110
void MD5Init (MD5_CTX *mdContext)
111
{
112
  mdContext->i[0] = mdContext->i[1] = (u32_t)0;
113
 
114
  /* Load magic initialization constants.
115
   */
116
  mdContext->buf[0] = (u32_t)0x67452301UL;
117
  mdContext->buf[1] = (u32_t)0xefcdab89UL;
118
  mdContext->buf[2] = (u32_t)0x98badcfeUL;
119
  mdContext->buf[3] = (u32_t)0x10325476UL;
120
}
121
 
122
/* The routine MD5Update updates the message-digest context to
123
   account for the presence of each of the characters inBuf[0..inLen-1]
124
   in the message whose digest is being computed.
125
 */
126
void MD5Update(MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen)
127
{
128
  u32_t in[16];
129
  int mdi;
130
  unsigned int i, ii;
131
 
132
#if 0
133
  ppp_trace(LOG_INFO, "MD5Update: %u:%.*H\n", inLen, MIN(inLen, 20) * 2, inBuf);
134
  ppp_trace(LOG_INFO, "MD5Update: %u:%s\n", inLen, inBuf);
135
#endif
136
 
137
  /* compute number of bytes mod 64 */
138
  mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
139
 
140
  /* update number of bits */
141
  if ((mdContext->i[0] + ((u32_t)inLen << 3)) < mdContext->i[0])
142
    mdContext->i[1]++;
143
  mdContext->i[0] += ((u32_t)inLen << 3);
144
  mdContext->i[1] += ((u32_t)inLen >> 29);
145
 
146
  while (inLen--) {
147
    /* add new character to buffer, increment mdi */
148
    mdContext->in[mdi++] = *inBuf++;
149
 
150
    /* transform if necessary */
151
    if (mdi == 0x40) {
152
      for (i = 0, ii = 0; i < 16; i++, ii += 4)
153
        in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |
154
                (((u32_t)mdContext->in[ii+2]) << 16) |
155
                                (((u32_t)mdContext->in[ii+1]) << 8) |
156
                ((u32_t)mdContext->in[ii]);
157
      Transform (mdContext->buf, in);
158
      mdi = 0;
159
    }
160
  }
161
}
162
 
163
/* The routine MD5Final terminates the message-digest computation and
164
   ends with the desired message digest in mdContext->digest[0...15].
165
 */
166
void MD5Final (unsigned char hash[], MD5_CTX *mdContext)
167
{
168
  u32_t in[16];
169
  int mdi;
170
  unsigned int i, ii;
171
  unsigned int padLen;
172
 
173
  /* save number of bits */
174
  in[14] = mdContext->i[0];
175
  in[15] = mdContext->i[1];
176
 
177
  /* compute number of bytes mod 64 */
178
  mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
179
 
180
  /* pad out to 56 mod 64 */
181
  padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
182
  MD5Update (mdContext, PADDING, padLen);
183
 
184
  /* append length in bits and transform */
185
  for (i = 0, ii = 0; i < 14; i++, ii += 4)
186
    in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |
187
            (((u32_t)mdContext->in[ii+2]) << 16) |
188
            (((u32_t)mdContext->in[ii+1]) << 8) |
189
            ((u32_t)mdContext->in[ii]);
190
  Transform (mdContext->buf, in);
191
 
192
  /* store buffer in digest */
193
  for (i = 0, ii = 0; i < 4; i++, ii += 4) {
194
    mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
195
        mdContext->digest[ii+1] =
196
      (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
197
    mdContext->digest[ii+2] =
198
      (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
199
    mdContext->digest[ii+3] =
200
      (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
201
  }
202
  memcpy(hash, mdContext->digest, 16);
203
}
204
 
205
/* Basic MD5 step. Transforms buf based on in.
206
 */
207
static void Transform (u32_t *buf, u32_t *in)
208
{
209
  u32_t a = buf[0], b = buf[1], c = buf[2], d = buf[3];
210
 
211
  /* Round 1 */
212
#define S11 7
213
#define S12 12
214
#define S13 17
215
#define S14 22
216
  FF ( a, b, c, d, in[ 0], S11, UL(3614090360)); /* 1 */
217
  FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */
218
  FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */
219
  FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */
220
  FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */
221
  FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */
222
  FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */
223
  FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */
224
  FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */
225
  FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */
226
  FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */
227
  FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */
228
  FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */
229
  FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */
230
  FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */
231
  FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 16 */
232
 
233
  /* Round 2 */
234
#define S21 5
235
#define S22 9
236
#define S23 14
237
#define S24 20
238
  GG ( a, b, c, d, in[ 1], S21, UL(4129170786)); /* 17 */
239
  GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */
240
  GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */
241
  GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */
242
  GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */
243
  GG ( d, a, b, c, in[10], S22, UL(  38016083)); /* 22 */
244
  GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */
245
  GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */
246
  GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */
247
  GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */
248
  GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */
249
  GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */
250
  GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */
251
  GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */
252
  GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */
253
  GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 32 */
254
 
255
  /* Round 3 */
256
#define S31 4
257
#define S32 11
258
#define S33 16
259
#define S34 23
260
  HH ( a, b, c, d, in[ 5], S31, UL(4294588738)); /* 33 */
261
  HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */
262
  HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */
263
  HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */
264
  HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */
265
  HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */
266
  HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */
267
  HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */
268
  HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */
269
  HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */
270
  HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */
271
  HH ( b, c, d, a, in[ 6], S34, UL(  76029189)); /* 44 */
272
  HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */
273
  HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */
274
  HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */
275
  HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 48 */
276
 
277
  /* Round 4 */
278
#define S41 6
279
#define S42 10
280
#define S43 15
281
#define S44 21
282
  II ( a, b, c, d, in[ 0], S41, UL(4096336452)); /* 49 */
283
  II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */
284
  II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */
285
  II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */
286
  II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */
287
  II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */
288
  II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */
289
  II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */
290
  II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */
291
  II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */
292
  II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */
293
  II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */
294
  II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */
295
  II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */
296
  II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */
297
  II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 64 */
298
 
299
  buf[0] += a;
300
  buf[1] += b;
301
  buf[2] += c;
302
  buf[3] += d;
303
}
304
 
305
#endif
306
 

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