1/*	$FreeBSD$	*/
2
3
4
5/*
6 ***********************************************************************
7 ** md5.c -- the source code for MD5 routines                         **
8 ** RSA Data Security, Inc. MD5 Message-Digest Algorithm              **
9 ** Created: 2/17/90 RLR                                              **
10 ** Revised: 1/91 SRD,AJ,BSK,JT Reference C ver., 7/10 constant corr. **
11 ***********************************************************************
12 */
13
14/*
15 ***********************************************************************
16 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved.  **
17 **                                                                   **
18 ** License to copy and use this software is granted provided that    **
19 ** it is identified as the "RSA Data Security, Inc. MD5 Message-     **
20 ** Digest Algorithm" in all material mentioning or referencing this  **
21 ** software or this function.                                        **
22 **                                                                   **
23 ** License is also granted to make and use derivative works          **
24 ** provided that such works are identified as "derived from the RSA  **
25 ** Data Security, Inc. MD5 Message-Digest Algorithm" in all          **
26 ** material mentioning or referencing the derived work.              **
27 **                                                                   **
28 ** RSA Data Security, Inc. makes no representations concerning       **
29 ** either the merchantability of this software or the suitability    **
30 ** of this software for any particular purpose.  It is provided "as  **
31 ** is" without express or implied warranty of any kind.              **
32 **                                                                   **
33 ** These notices must be retained in any copies of any part of this  **
34 ** documentation and/or software.                                    **
35 ***********************************************************************
36 */
37
38# if defined(_KERNEL)
39#  include <sys/systm.h>
40# else
41#  include <string.h>
42# endif
43
44#include "md5.h"
45
46/*
47 ***********************************************************************
48 **  Message-digest routines:                                         **
49 **  To form the message digest for a message M                       **
50 **    (1) Initialize a context buffer mdContext using MD5Init        **
51 **    (2) Call MD5Update on mdContext and M                          **
52 **    (3) Call MD5Final on mdContext                                 **
53 **  The message digest is now in mdContext->digest[0...15]           **
54 ***********************************************************************
55 */
56
57/* forward declaration */
58static void Transform __P((UINT4 *, UINT4 *));
59
60static unsigned char PADDING[64] = {
61  0x80, 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  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
68  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
69};
70
71/* F, G, H and I are basic MD5 functions */
72#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
73#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
74#define H(x, y, z) ((x) ^ (y) ^ (z))
75#define I(x, y, z) ((y) ^ ((x) | (~z)))
76
77/* ROTATE_LEFT rotates x left n bits */
78#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
79
80/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
81/* Rotation is separate from addition to prevent recomputation */
82#define FF(a, b, c, d, x, s, ac) \
83  {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
84   (a) = ROTATE_LEFT ((a), (s)); \
85   (a) += (b); \
86  }
87#define GG(a, b, c, d, x, s, ac) \
88  {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
89   (a) = ROTATE_LEFT ((a), (s)); \
90   (a) += (b); \
91  }
92#define HH(a, b, c, d, x, s, ac) \
93  {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
94   (a) = ROTATE_LEFT ((a), (s)); \
95   (a) += (b); \
96  }
97#define II(a, b, c, d, x, s, ac) \
98  {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
99   (a) = ROTATE_LEFT ((a), (s)); \
100   (a) += (b); \
101  }
102
103#ifdef __STDC__
104#define UL(x)	x##U
105#else
106#define UL(x)	x
107#endif
108
109/* The routine MD5Init initializes the message-digest context
110   mdContext. All fields are set to zero.
111 */
112void MD5Init (mdContext)
113MD5_CTX *mdContext;
114{
115  mdContext->i[0] = mdContext->i[1] = (UINT4)0;
116
117  /* Load magic initialization constants.
118   */
119  mdContext->buf[0] = (UINT4)0x67452301;
120  mdContext->buf[1] = (UINT4)0xefcdab89;
121  mdContext->buf[2] = (UINT4)0x98badcfe;
122  mdContext->buf[3] = (UINT4)0x10325476;
123}
124
125/* The routine MD5Update updates the message-digest context to
126   account for the presence of each of the characters inBuf[0..inLen-1]
127   in the message whose digest is being computed.
128 */
129void MD5Update (mdContext, inBuf, inLen)
130MD5_CTX *mdContext;
131unsigned char *inBuf;
132unsigned int inLen;
133{
134  UINT4 in[16];
135  int mdi;
136  unsigned int i, ii;
137
138  /* compute number of bytes mod 64 */
139  mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
140
141  /* update number of bits */
142  if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0])
143    mdContext->i[1]++;
144  mdContext->i[0] += ((UINT4)inLen << 3);
145  mdContext->i[1] += ((UINT4)inLen >> 29);
146
147  while (inLen--) {
148    /* add new character to buffer, increment mdi */
149    mdContext->in[mdi++] = *inBuf++;
150
151    /* transform if necessary */
152    if (mdi == 0x40) {
153      for (i = 0, ii = 0; i < 16; i++, ii += 4)
154        in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
155                (((UINT4)mdContext->in[ii+2]) << 16) |
156                (((UINT4)mdContext->in[ii+1]) << 8) |
157                ((UINT4)mdContext->in[ii]);
158      Transform (mdContext->buf, in);
159      mdi = 0;
160    }
161  }
162}
163
164/* The routine MD5Final terminates the message-digest computation and
165   ends with the desired message digest in mdContext->digest[0...15].
166 */
167void MD5Final (hash, mdContext)
168unsigned char hash[];
169MD5_CTX *mdContext;
170{
171  UINT4 in[16];
172  int mdi;
173  unsigned int i, ii;
174  unsigned int padLen;
175
176  /* save number of bits */
177  in[14] = mdContext->i[0];
178  in[15] = mdContext->i[1];
179
180  /* compute number of bytes mod 64 */
181  mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
182
183  /* pad out to 56 mod 64 */
184  padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
185  MD5Update (mdContext, PADDING, padLen);
186
187  /* append length in bits and transform */
188  for (i = 0, ii = 0; i < 14; i++, ii += 4)
189    in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
190            (((UINT4)mdContext->in[ii+2]) << 16) |
191            (((UINT4)mdContext->in[ii+1]) << 8) |
192            ((UINT4)mdContext->in[ii]);
193  Transform (mdContext->buf, in);
194
195  /* store buffer in digest */
196  for (i = 0, ii = 0; i < 4; i++, ii += 4) {
197    mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
198    mdContext->digest[ii+1] =
199      (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
200    mdContext->digest[ii+2] =
201      (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
202    mdContext->digest[ii+3] =
203      (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
204  }
205  bcopy((char *)mdContext->digest, (char *)hash, 16);
206}
207
208/* Basic MD5 step. Transforms buf based on in.
209 */
210static void Transform (buf, in)
211UINT4 *buf;
212UINT4 *in;
213{
214  UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
215
216  /* Round 1 */
217#define S11 7
218#define S12 12
219#define S13 17
220#define S14 22
221  FF ( a, b, c, d, in[ 0], S11, UL(3614090360)); /* 1 */
222  FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */
223  FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */
224  FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */
225  FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */
226  FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */
227  FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */
228  FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */
229  FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */
230  FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */
231  FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */
232  FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */
233  FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */
234  FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */
235  FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */
236  FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 16 */
237
238  /* Round 2 */
239#define S21 5
240#define S22 9
241#define S23 14
242#define S24 20
243  GG ( a, b, c, d, in[ 1], S21, UL(4129170786)); /* 17 */
244  GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */
245  GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */
246  GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */
247  GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */
248  GG ( d, a, b, c, in[10], S22, UL(  38016083)); /* 22 */
249  GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */
250  GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */
251  GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */
252  GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */
253  GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */
254  GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */
255  GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */
256  GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */
257  GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */
258  GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 32 */
259
260  /* Round 3 */
261#define S31 4
262#define S32 11
263#define S33 16
264#define S34 23
265  HH ( a, b, c, d, in[ 5], S31, UL(4294588738)); /* 33 */
266  HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */
267  HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */
268  HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */
269  HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */
270  HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */
271  HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */
272  HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */
273  HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */
274  HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */
275  HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */
276  HH ( b, c, d, a, in[ 6], S34, UL(  76029189)); /* 44 */
277  HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */
278  HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */
279  HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */
280  HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 48 */
281
282  /* Round 4 */
283#define S41 6
284#define S42 10
285#define S43 15
286#define S44 21
287  II ( a, b, c, d, in[ 0], S41, UL(4096336452)); /* 49 */
288  II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */
289  II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */
290  II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */
291  II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */
292  II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */
293  II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */
294  II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */
295  II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */
296  II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */
297  II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */
298  II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */
299  II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */
300  II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */
301  II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */
302  II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 64 */
303
304  buf[0] += a;
305  buf[1] += b;
306  buf[2] += c;
307  buf[3] += d;
308}
309
310/*
311 ***********************************************************************
312 ** End of md5.c                                                      **
313 ******************************** (cut) ********************************
314 */
315