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 ***********************************************************************
11 ***********************************************************************
12 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. **
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. **
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. **
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. **
29 ** These notices must be retained in any copies of any part of this **
30 ** documentation and/or software. **
31 ***********************************************************************
38 #if CHAP_SUPPORT > 0 || MD5_SUPPORT > 0
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 ***********************************************************************
51 /* forward declaration */
52 static void Transform (u32_t *buf, u32_t *in);
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
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)))
71 /* ROTATE_LEFT rotates x left n bits */
72 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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)); \
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)); \
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)); \
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)); \
107 /* The routine MD5Init initializes the message-digest context
108 mdContext. All fields are set to zero.
110 void MD5Init (MD5_CTX *mdContext)
112 mdContext->i[0] = mdContext->i[1] = (u32_t)0;
114 /* Load magic initialization constants.
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;
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.
126 void MD5Update(MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen)
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);
137 /* compute number of bytes mod 64 */
138 mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
140 /* update number of bits */
141 if ((mdContext->i[0] + ((u32_t)inLen << 3)) < mdContext->i[0])
143 mdContext->i[0] += ((u32_t)inLen << 3);
144 mdContext->i[1] += ((u32_t)inLen >> 29);
147 /* add new character to buffer, increment mdi */
148 mdContext->in[mdi++] = *inBuf++;
150 /* transform if necessary */
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);
163 /* The routine MD5Final terminates the message-digest computation and
164 ends with the desired message digest in mdContext->digest[0...15].
166 void MD5Final (unsigned char hash[], MD5_CTX *mdContext)
173 /* save number of bits */
174 in[14] = mdContext->i[0];
175 in[15] = mdContext->i[1];
177 /* compute number of bytes mod 64 */
178 mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
180 /* pad out to 56 mod 64 */
181 padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
182 MD5Update (mdContext, PADDING, padLen);
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);
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);
202 memcpy(hash, mdContext->digest, 16);
205 /* Basic MD5 step. Transforms buf based on in.
207 static void Transform (u32_t *buf, u32_t *in)
209 u32_t a = buf[0], b = buf[1], c = buf[2], d = buf[3];
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 */
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 */
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 */
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 */