source: UsbWattMeter/trunk/lwip-1.4.1/src/netif/ppp/md5.c

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1/*
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 "lwip/opt.h"
35
36#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
37
38#if CHAP_SUPPORT || MD5_SUPPORT
39
40#include "ppp_impl.h"
41#include "pppdebug.h"
42
43#include "md5.h"
44
45#include <string.h>
46
47/*
48 ***********************************************************************
49 ** Message-digest routines: **
50 ** To form the message digest for a message M **
51 ** (1) Initialize a context buffer mdContext using MD5Init **
52 ** (2) Call MD5Update on mdContext and M **
53 ** (3) Call MD5Final on mdContext **
54 ** The message digest is now in mdContext->digest[0...15] **
55 ***********************************************************************
56 */
57
58/* forward declaration */
59static void Transform (u32_t *buf, u32_t *in);
60
61static unsigned char PADDING[64] = {
62 0x80, 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 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
70};
71
72/* F, G, H and I are basic MD5 functions */
73#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
74#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
75#define H(x, y, z) ((x) ^ (y) ^ (z))
76#define I(x, y, z) ((y) ^ ((x) | (~z)))
77
78/* ROTATE_LEFT rotates x left n bits */
79#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
80
81/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
82/* Rotation is separate from addition to prevent recomputation */
83#define FF(a, b, c, d, x, s, ac) \
84 {(a) += F ((b), (c), (d)) + (x) + (u32_t)(ac); \
85 (a) = ROTATE_LEFT ((a), (s)); \
86 (a) += (b); \
87 }
88#define GG(a, b, c, d, x, s, ac) \
89 {(a) += G ((b), (c), (d)) + (x) + (u32_t)(ac); \
90 (a) = ROTATE_LEFT ((a), (s)); \
91 (a) += (b); \
92 }
93#define HH(a, b, c, d, x, s, ac) \
94 {(a) += H ((b), (c), (d)) + (x) + (u32_t)(ac); \
95 (a) = ROTATE_LEFT ((a), (s)); \
96 (a) += (b); \
97 }
98#define II(a, b, c, d, x, s, ac) \
99 {(a) += I ((b), (c), (d)) + (x) + (u32_t)(ac); \
100 (a) = ROTATE_LEFT ((a), (s)); \
101 (a) += (b); \
102 }
103
104#ifdef __STDC__
105#define UL(x) x##UL
106#else
107#ifdef WIN32
108#define UL(x) x##UL
109#else
110#define UL(x) x
111#endif
112#endif
113
114/* The routine MD5Init initializes the message-digest context
115 mdContext. All fields are set to zero.
116 */
117void
118MD5Init (MD5_CTX *mdContext)
119{
120 mdContext->i[0] = mdContext->i[1] = (u32_t)0;
121
122 /* Load magic initialization constants. */
123 mdContext->buf[0] = (u32_t)0x67452301UL;
124 mdContext->buf[1] = (u32_t)0xefcdab89UL;
125 mdContext->buf[2] = (u32_t)0x98badcfeUL;
126 mdContext->buf[3] = (u32_t)0x10325476UL;
127}
128
129/* The routine MD5Update updates the message-digest context to
130 account for the presence of each of the characters inBuf[0..inLen-1]
131 in the message whose digest is being computed.
132 */
133void
134MD5Update(MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen)
135{
136 u32_t in[16];
137 int mdi;
138 unsigned int i, ii;
139
140#if 0
141 PPPDEBUG(LOG_INFO, ("MD5Update: %u:%.*H\n", inLen, LWIP_MIN(inLen, 20) * 2, inBuf));
142 PPPDEBUG(LOG_INFO, ("MD5Update: %u:%s\n", inLen, inBuf));
143#endif
144
145 /* compute number of bytes mod 64 */
146 mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
147
148 /* update number of bits */
149 if ((mdContext->i[0] + ((u32_t)inLen << 3)) < mdContext->i[0]) {
150 mdContext->i[1]++;
151 }
152 mdContext->i[0] += ((u32_t)inLen << 3);
153 mdContext->i[1] += ((u32_t)inLen >> 29);
154
155 while (inLen--) {
156 /* add new character to buffer, increment mdi */
157 mdContext->in[mdi++] = *inBuf++;
158
159 /* transform if necessary */
160 if (mdi == 0x40) {
161 for (i = 0, ii = 0; i < 16; i++, ii += 4) {
162 in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |
163 (((u32_t)mdContext->in[ii+2]) << 16) |
164 (((u32_t)mdContext->in[ii+1]) << 8) |
165 ((u32_t)mdContext->in[ii]);
166 }
167 Transform (mdContext->buf, in);
168 mdi = 0;
169 }
170 }
171}
172
173/* The routine MD5Final terminates the message-digest computation and
174 ends with the desired message digest in mdContext->digest[0...15].
175 */
176void
177MD5Final (unsigned char hash[], MD5_CTX *mdContext)
178{
179 u32_t in[16];
180 int mdi;
181 unsigned int i, ii;
182 unsigned int padLen;
183
184 /* save number of bits */
185 in[14] = mdContext->i[0];
186 in[15] = mdContext->i[1];
187
188 /* compute number of bytes mod 64 */
189 mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
190
191 /* pad out to 56 mod 64 */
192 padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
193 MD5Update (mdContext, PADDING, padLen);
194
195 /* append length in bits and transform */
196 for (i = 0, ii = 0; i < 14; i++, ii += 4) {
197 in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |
198 (((u32_t)mdContext->in[ii+2]) << 16) |
199 (((u32_t)mdContext->in[ii+1]) << 8) |
200 ((u32_t)mdContext->in[ii]);
201 }
202 Transform (mdContext->buf, in);
203
204 /* store buffer in digest */
205 for (i = 0, ii = 0; i < 4; i++, ii += 4) {
206 mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
207 mdContext->digest[ii+1] =
208 (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
209 mdContext->digest[ii+2] =
210 (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
211 mdContext->digest[ii+3] =
212 (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
213 }
214 SMEMCPY(hash, mdContext->digest, 16);
215}
216
217/* Basic MD5 step. Transforms buf based on in.
218 */
219static void
220Transform (u32_t *buf, u32_t *in)
221{
222 u32_t a = buf[0], b = buf[1], c = buf[2], d = buf[3];
223
224 /* Round 1 */
225#define S11 7
226#define S12 12
227#define S13 17
228#define S14 22
229 FF ( a, b, c, d, in[ 0], S11, UL(3614090360)); /* 1 */
230 FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */
231 FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */
232 FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */
233 FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */
234 FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */
235 FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */
236 FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */
237 FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */
238 FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */
239 FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */
240 FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */
241 FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */
242 FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */
243 FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */
244 FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 16 */
245
246 /* Round 2 */
247#define S21 5
248#define S22 9
249#define S23 14
250#define S24 20
251 GG ( a, b, c, d, in[ 1], S21, UL(4129170786)); /* 17 */
252 GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */
253 GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */
254 GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */
255 GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */
256 GG ( d, a, b, c, in[10], S22, UL( 38016083)); /* 22 */
257 GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */
258 GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */
259 GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */
260 GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */
261 GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */
262 GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */
263 GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */
264 GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */
265 GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */
266 GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 32 */
267
268 /* Round 3 */
269#define S31 4
270#define S32 11
271#define S33 16
272#define S34 23
273 HH ( a, b, c, d, in[ 5], S31, UL(4294588738)); /* 33 */
274 HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */
275 HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */
276 HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */
277 HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */
278 HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */
279 HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */
280 HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */
281 HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */
282 HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */
283 HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */
284 HH ( b, c, d, a, in[ 6], S34, UL( 76029189)); /* 44 */
285 HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */
286 HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */
287 HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */
288 HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 48 */
289
290 /* Round 4 */
291#define S41 6
292#define S42 10
293#define S43 15
294#define S44 21
295 II ( a, b, c, d, in[ 0], S41, UL(4096336452)); /* 49 */
296 II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */
297 II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */
298 II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */
299 II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */
300 II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */
301 II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */
302 II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */
303 II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */
304 II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */
305 II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */
306 II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */
307 II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */
308 II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */
309 II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */
310 II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 64 */
311
312 buf[0] += a;
313 buf[1] += b;
314 buf[2] += c;
315 buf[3] += d;
316}
317
318#endif /* CHAP_SUPPORT || MD5_SUPPORT */
319
320#endif /* PPP_SUPPORT */
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