File: md5.c

package info (click to toggle)
wipe 0.24-4
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 468 kB
  • sloc: ansic: 1,925; makefile: 93; perl: 85; sh: 27
file content (288 lines) | stat: -rw-r--r-- 11,269 bytes parent folder | download | duplicates (9)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
/*
 ***********************************************************************
 ** md5.c -- the source code for MD5 routines                         **
 ** RSA Data Security, Inc. MD5 Message-Digest Algorithm              **
 ** Created: 2/17/90 RLR                                              **
 ** Revised: 1/91 SRD,AJ,BSK,JT Reference C Version                   **
 ***********************************************************************
 */

/*
 * Edited 7 May 93 by CP to change the interface to match that
 * of the MD5 routines in RSAREF.  Due to this alteration, this
 * code is "derived from the RSA Data Security, Inc. MD5 Message-
 * Digest Algorithm".  (See below.)
 */

/*
 ***********************************************************************
 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved.  **
 **                                                                   **
 ** License to copy and use this software is granted provided that    **
 ** it is identified as the "RSA Data Security, Inc. MD5 Message-     **
 ** Digest Algorithm" in all material mentioning or referencing this  **
 ** software or this function.                                        **
 **                                                                   **
 ** License is also granted to make and use derivative works          **
 ** provided that such works are identified as "derived from the RSA  **
 ** Data Security, Inc. MD5 Message-Digest Algorithm" in all          **
 ** material mentioning or referencing the derived work.              **
 **                                                                   **
 ** RSA Data Security, Inc. makes no representations concerning       **
 ** either the merchantability of this software or the suitability    **
 ** of this software for any particular purpose.  It is provided "as  **
 ** is" without express or implied warranty of any kind.              **
 **                                                                   **
 ** These notices must be retained in any copies of any part of this  **
 ** documentation and/or software.                                    **
 ***********************************************************************
 */

#include "md5.h"

/*
 ***********************************************************************
 **  Message-digest routines:                                         **
 **  To form the message digest for a message M                       **
 **    (1) Initialize a context buffer mdContext using MD5Init        **
 **    (2) Call MD5Update on mdContext and M                          **
 **    (3) Call MD5Final on mdContext                                 **
 **  The message digest is now in the bugffer passed to MD5Final      **
 ***********************************************************************
 */

static unsigned char PADDING[64] = {
  0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

/* F, G, H and I are basic MD5 functions */
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits */
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
/* Rotation is separate from addition to prevent recomputation */
#define FF(a, b, c, d, x, s, ac) \
  {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
  }
#define GG(a, b, c, d, x, s, ac) \
  {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
  }
#define HH(a, b, c, d, x, s, ac) \
  {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
  }
#define II(a, b, c, d, x, s, ac) \
  {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
  }

/* The routine MD5Init initializes the message-digest context
   mdContext. All fields are set to zero.
 */
void MD5Init ( MD5_CTX *mdContext)
{
  mdContext->i[0] = mdContext->i[1] = (UINT4)0;

  /* Load magic initialization constants.
   */
  mdContext->buf[0] = (UINT4)0x67452301L;
  mdContext->buf[1] = (UINT4)0xefcdab89L;
  mdContext->buf[2] = (UINT4)0x98badcfeL;
  mdContext->buf[3] = (UINT4)0x10325476L;
}

/* The routine MD5Update updates the message-digest context to
   account for the presence of each of the characters inBuf[0..inLen-1]
   in the message whose digest is being computed.
 */
void MD5Update (register MD5_CTX *mdContext, unsigned char *inBuf,
		 unsigned int inLen)
{
  register int i, ii;
  int mdi;
  UINT4 in[16];

  /* compute number of bytes mod 64 */
  mdi = (int)((mdContext->i[0] >> 3) & 0x3F);

  /* update number of bits */
  if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0])
    mdContext->i[1]++;
  mdContext->i[0] += ((UINT4)inLen << 3);
  mdContext->i[1] += ((UINT4)inLen >> 29);

  while (inLen--) {
    /* add new character to buffer, increment mdi */
    mdContext->in[mdi++] = *inBuf++;

    /* transform if necessary */
    if (mdi == 0x40) {
      for (i = 0, ii = 0; i < 16; i++, ii += 4)
        in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
                (((UINT4)mdContext->in[ii+2]) << 16) |
                (((UINT4)mdContext->in[ii+1]) << 8) |
                ((UINT4)mdContext->in[ii]);
      Transform (mdContext->buf, in);
      mdi = 0;
    }
  }
}

/* The routine MD5Final terminates the message-digest computation and
   ends with the desired message digest in mdContext->digest[0...15].
 */
void MD5Final (unsigned char digest[16], MD5_CTX *mdContext)
{
  UINT4 in[16];
  int mdi;
  unsigned int i, ii;
  unsigned int padLen;

  /* save number of bits */
  in[14] = mdContext->i[0];
  in[15] = mdContext->i[1];

  /* compute number of bytes mod 64 */
  mdi = (int)((mdContext->i[0] >> 3) & 0x3F);

  /* pad out to 56 mod 64 */
  padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
  MD5Update (mdContext, PADDING, padLen);

  /* append length in bits and transform */
  for (i = 0, ii = 0; i < 14; i++, ii += 4)
    in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
            (((UINT4)mdContext->in[ii+2]) << 16) |
            (((UINT4)mdContext->in[ii+1]) << 8) |
            ((UINT4)mdContext->in[ii]);
  Transform (mdContext->buf, in);

  /* store buffer in digest */
  for (i = 0, ii = 0; i < 4; i++, ii += 4) {
    digest[ii]   = (unsigned char) (mdContext->buf[i]        & 0xFF);
    digest[ii+1] = (unsigned char)((mdContext->buf[i] >> 8)  & 0xFF);
    digest[ii+2] = (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
    digest[ii+3] = (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
  }
}

/* Basic MD5 step. Transforms buf based on in.  Note that if the Mysterious
   Constants are arranged backwards in little-endian order and decrypted with
   the DES they produce OCCULT MESSAGES!
 */
void Transform(register UINT4 *buf,register UINT4 *in)
{
  register UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];

  /* Round 1 */
#define S11 7
#define S12 12
#define S13 17
#define S14 22
  FF ( a, b, c, d, in[ 0], S11, 0xD76AA478L); /* 1 */
  FF ( d, a, b, c, in[ 1], S12, 0xE8C7B756L); /* 2 */
  FF ( c, d, a, b, in[ 2], S13, 0x242070DBL); /* 3 */
  FF ( b, c, d, a, in[ 3], S14, 0xC1BDCEEEL); /* 4 */
  FF ( a, b, c, d, in[ 4], S11, 0xF57C0FAFL); /* 5 */
  FF ( d, a, b, c, in[ 5], S12, 0x4787C62AL); /* 6 */
  FF ( c, d, a, b, in[ 6], S13, 0xA8304613L); /* 7 */
  FF ( b, c, d, a, in[ 7], S14, 0xFD469501L); /* 8 */
  FF ( a, b, c, d, in[ 8], S11, 0x698098D8L); /* 9 */
  FF ( d, a, b, c, in[ 9], S12, 0x8B44F7AFL); /* 10 */
  FF ( c, d, a, b, in[10], S13, 0xFFFF5BB1L); /* 11 */
  FF ( b, c, d, a, in[11], S14, 0x895CD7BEL); /* 12 */
  FF ( a, b, c, d, in[12], S11, 0x6B901122L); /* 13 */
  FF ( d, a, b, c, in[13], S12, 0xFD987193L); /* 14 */
  FF ( c, d, a, b, in[14], S13, 0xA679438EL); /* 15 */
  FF ( b, c, d, a, in[15], S14, 0x49B40821L); /* 16 */

  /* Round 2 */
#define S21 5
#define S22 9
#define S23 14
#define S24 20
  GG ( a, b, c, d, in[ 1], S21, 0xF61E2562L); /* 17 */
  GG ( d, a, b, c, in[ 6], S22, 0xC040B340L); /* 18 */
  GG ( c, d, a, b, in[11], S23, 0x265E5A51L); /* 19 */
  GG ( b, c, d, a, in[ 0], S24, 0xE9B6C7AAL); /* 20 */
  GG ( a, b, c, d, in[ 5], S21, 0xD62F105DL); /* 21 */
  GG ( d, a, b, c, in[10], S22, 0x02441453L); /* 22 */
  GG ( c, d, a, b, in[15], S23, 0xD8A1E681L); /* 23 */
  GG ( b, c, d, a, in[ 4], S24, 0xE7D3FBC8L); /* 24 */
  GG ( a, b, c, d, in[ 9], S21, 0x21E1CDE6L); /* 25 */
  GG ( d, a, b, c, in[14], S22, 0xC33707D6L); /* 26 */
  GG ( c, d, a, b, in[ 3], S23, 0xF4D50D87L); /* 27 */
  GG ( b, c, d, a, in[ 8], S24, 0x455A14EDL); /* 28 */
  GG ( a, b, c, d, in[13], S21, 0xA9E3E905L); /* 29 */
  GG ( d, a, b, c, in[ 2], S22, 0xFCEFA3F8L); /* 30 */
  GG ( c, d, a, b, in[ 7], S23, 0x676F02D9L); /* 31 */
  GG ( b, c, d, a, in[12], S24, 0x8D2A4C8AL); /* 32 */

  /* Round 3 */
#define S31 4
#define S32 11
#define S33 16
#define S34 23
  HH ( a, b, c, d, in[ 5], S31, 0xFFFA3942L); /* 33 */
  HH ( d, a, b, c, in[ 8], S32, 0x8771F681L); /* 34 */
  HH ( c, d, a, b, in[11], S33, 0x6D9D6122L); /* 35 */
  HH ( b, c, d, a, in[14], S34, 0xFDE5380CL); /* 36 */
  HH ( a, b, c, d, in[ 1], S31, 0xA4BEEA44L); /* 37 */
  HH ( d, a, b, c, in[ 4], S32, 0x4BDECFA9L); /* 38 */
  HH ( c, d, a, b, in[ 7], S33, 0xF6BB4B60L); /* 39 */
  HH ( b, c, d, a, in[10], S34, 0xBEBFBC70L); /* 40 */
  HH ( a, b, c, d, in[13], S31, 0x289B7EC6L); /* 41 */
  HH ( d, a, b, c, in[ 0], S32, 0xEAA127FAL); /* 42 */
  HH ( c, d, a, b, in[ 3], S33, 0xD4EF3085L); /* 43 */
  HH ( b, c, d, a, in[ 6], S34, 0x04881D05L); /* 44 */
  HH ( a, b, c, d, in[ 9], S31, 0xD9D4D039L); /* 45 */
  HH ( d, a, b, c, in[12], S32, 0xE6DB99E5L); /* 46 */
  HH ( c, d, a, b, in[15], S33, 0x1FA27CF8L); /* 47 */
  HH ( b, c, d, a, in[ 2], S34, 0xC4AC5665L); /* 48 */

  /* Round 4 */
#define S41 6
#define S42 10
#define S43 15
#define S44 21
  II ( a, b, c, d, in[ 0], S41, 0xF4292244L); /* 49 */
  II ( d, a, b, c, in[ 7], S42, 0x432AFF97L); /* 50 */
  II ( c, d, a, b, in[14], S43, 0xAB9423A7L); /* 51 */
  II ( b, c, d, a, in[ 5], S44, 0xFC93A039L); /* 52 */
  II ( a, b, c, d, in[12], S41, 0x655B59C3L); /* 53 */
  II ( d, a, b, c, in[ 3], S42, 0x8F0CCC92L); /* 54 */
  II ( c, d, a, b, in[10], S43, 0xFFEFF47DL); /* 55 */
  II ( b, c, d, a, in[ 1], S44, 0x85845DD1L); /* 56 */
  II ( a, b, c, d, in[ 8], S41, 0x6FA87E4FL); /* 57 */
  II ( d, a, b, c, in[15], S42, 0xFE2CE6E0L); /* 58 */
  II ( c, d, a, b, in[ 6], S43, 0xA3014314L); /* 59 */
  II ( b, c, d, a, in[13], S44, 0x4E0811A1L); /* 60 */
  II ( a, b, c, d, in[ 4], S41, 0xF7537E82L); /* 61 */
  II ( d, a, b, c, in[11], S42, 0xBD3AF235L); /* 62 */
  II ( c, d, a, b, in[ 2], S43, 0x2AD7D2BBL); /* 63 */
  II ( b, c, d, a, in[ 9], S44, 0xEB86D391L); /* 64 */

  buf[0] += a;
  buf[1] += b;
  buf[2] += c;
  buf[3] += d;
}