1 /* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
2 */
3
4 /* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
5 rights reserved.
6
7 License to copy and use this software is granted provided that it
8 is identified as the "RSA Data Security, Inc. MD5 Message-Digest
9 Algorithm" in all material mentioning or referencing this software
10 or this function.
11
12 License is also granted to make and use derivative works provided
13 that such works are identified as "derived from the RSA Data
14 Security, Inc. MD5 Message-Digest Algorithm" in all material
15 mentioning or referencing the derived work.
16
17 RSA Data Security, Inc. makes no representations concerning either
18 the merchantability of this software or the suitability of this
19 software for any particular purpose. It is provided "as is"
20 without express or implied warranty of any kind.
21
22 These notices must be retained in any copies of any part of this
23 documentation and/or software.
24 */
25
26 #ifdef HAVE_CONFIG_H
27 # include "config.h"
28 #endif
29
30 #ifndef USE_OPENSSL
31 #include <string.h>
32
33 #include "md5.h"
34
35 /* Constants for MD5Transform routine.
36 */
37
38 #define S11 7
39 #define S12 12
40 #define S13 17
41 #define S14 22
42 #define S21 5
43 #define S22 9
44 #define S23 14
45 #define S24 20
46 #define S31 4
47 #define S32 11
48 #define S33 16
49 #define S34 23
50 #define S41 6
51 #define S42 10
52 #define S43 15
53 #define S44 21
54
55 static void li_MD5Transform (UINT4 [4], const unsigned char [64]);
56 static void Encode (unsigned char *, UINT4 *, unsigned int);
57 static void Decode (UINT4 *, const unsigned char *, unsigned int);
58
59 #ifdef HAVE_MEMCPY
60 #define MD5_memcpy(output, input, len) memcpy((output), (input), (len))
61 #else
62 static void MD5_memcpy (POINTER, POINTER, unsigned int);
63 #endif
64 #ifdef HAVE_MEMSET
65 #define MD5_memset(output, value, len) memset((output), (value), (len))
66 #else
67 static void MD5_memset (POINTER, int, unsigned int);
68 #endif
69
70 static const unsigned char PADDING[64] = {
71 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
72 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
73 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
74 };
75
76 /* F, G, H and I are basic MD5 functions.
77 */
78 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
79 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
80 #define H(x, y, z) ((x) ^ (y) ^ (z))
81 #define I(x, y, z) ((y) ^ ((x) | (~z)))
82
83 /* ROTATE_LEFT rotates x left n bits.
84 */
85 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
86
87 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
88 Rotation is separate from addition to prevent recomputation.
89 */
90 #define FF(a, b, c, d, x, s, ac) { \
91 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
92 (a) = ROTATE_LEFT ((a), (s)); \
93 (a) += (b); \
94 }
95 #define GG(a, b, c, d, x, s, ac) { \
96 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
97 (a) = ROTATE_LEFT ((a), (s)); \
98 (a) += (b); \
99 }
100 #define HH(a, b, c, d, x, s, ac) { \
101 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
102 (a) = ROTATE_LEFT ((a), (s)); \
103 (a) += (b); \
104 }
105 #define II(a, b, c, d, x, s, ac) { \
106 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
107 (a) = ROTATE_LEFT ((a), (s)); \
108 (a) += (b); \
109 }
110
111 /* MD5 initialization. Begins an MD5 operation, writing a new context.
112 */
li_MD5_Init(li_MD5_CTX * context)113 void li_MD5_Init (li_MD5_CTX *context)
114 {
115 context->count[0] = context->count[1] = 0;
116 /* Load magic initialization constants.
117 */
118 context->state[0] = 0x67452301;
119 context->state[1] = 0xefcdab89;
120 context->state[2] = 0x98badcfe;
121 context->state[3] = 0x10325476;
122 }
123
124 /* MD5 block update operation. Continues an MD5 message-digest
125 operation, processing another message block, and updating the
126 context.
127 */
li_MD5_Update(li_MD5_CTX * context,const void * _input,unsigned int inputLen)128 void li_MD5_Update (li_MD5_CTX *context, const void *_input, unsigned int inputLen)
129 {
130 unsigned int i, ndx, partLen;
131 const unsigned char *input = (const unsigned char*) _input;
132
133 /* Compute number of bytes mod 64 */
134 ndx = (unsigned int)((context->count[0] >> 3) & 0x3F);
135
136 /* Update number of bits */
137 if ((context->count[0] += ((UINT4)inputLen << 3))
138
139 < ((UINT4)inputLen << 3))
140 context->count[1]++;
141 context->count[1] += ((UINT4)inputLen >> 29);
142
143 partLen = 64 - ndx;
144
145 /* Transform as many times as possible.
146 */
147 if (inputLen >= partLen) {
148 MD5_memcpy
149 ((POINTER)&context->buffer[ndx], (POINTER)input, partLen);
150 li_MD5Transform (context->state, context->buffer);
151
152 for (i = partLen; i + 63 < inputLen; i += 64)
153 li_MD5Transform (context->state, &input[i]);
154
155 ndx = 0;
156 }
157 else
158 i = 0;
159
160 /* Buffer remaining input */
161 MD5_memcpy
162 ((POINTER)&context->buffer[ndx], (POINTER)&input[i],
163 inputLen-i);
164 }
165
166 /* MD5 finalization. Ends an MD5 message-digest operation, writing the
167 the message digest and zeroizing the context.
168 */
li_MD5_Final(unsigned char digest[16],li_MD5_CTX * context)169 void li_MD5_Final (unsigned char digest[16], li_MD5_CTX *context)
170 {
171 unsigned char bits[8];
172 unsigned int ndx, padLen;
173
174 /* Save number of bits */
175 Encode (bits, context->count, 8);
176
177 /* Pad out to 56 mod 64.
178 */
179 ndx = (unsigned int)((context->count[0] >> 3) & 0x3f);
180 padLen = (ndx < 56) ? (56 - ndx) : (120 - ndx);
181 li_MD5_Update (context, PADDING, padLen);
182
183 /* Append length (before padding) */
184 li_MD5_Update (context, bits, 8);
185
186 /* Store state in digest */
187 Encode (digest, context->state, 16);
188
189 /* Zeroize sensitive information.
190 */
191 MD5_memset ((POINTER)context, 0, sizeof (*context));
192 }
193
194 /* MD5 basic transformation. Transforms state based on block.
195 */
li_MD5Transform(UINT4 state[4],const unsigned char block[64])196 static void li_MD5Transform (UINT4 state[4], const unsigned char block[64])
197 {
198 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
199
200 Decode (x, block, 64);
201
202 /* Round 1 */
203 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
204 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
205 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
206 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
207 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
208 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
209 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
210 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
211 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
212 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
213 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
214 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
215 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
216 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
217 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
218 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
219
220 /* Round 2 */
221 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
222 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
223 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
224 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
225 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
226 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
227 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
228 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
229 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
230 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
231 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
232
233 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
234 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
235 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
236 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
237 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
238
239 /* Round 3 */
240 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
241 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
242 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
243 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
244 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
245 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
246 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
247 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
248 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
249 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
250 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
251 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
252 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
253 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
254 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
255 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
256
257 /* Round 4 */
258 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
259 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
260 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
261 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
262 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
263 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
264 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
265 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
266 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
267 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
268 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
269 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
270 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
271 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
272 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
273 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
274
275 state[0] += a;
276 state[1] += b;
277 state[2] += c;
278 state[3] += d;
279
280 /* Zeroize sensitive information.
281
282 */
283 MD5_memset ((POINTER)x, 0, sizeof (x));
284 }
285
286 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
287 a multiple of 4.
288 */
Encode(unsigned char * output,UINT4 * input,unsigned int len)289 static void Encode (unsigned char *output, UINT4 *input, unsigned int len)
290 {
291 unsigned int i, j;
292
293 for (i = 0, j = 0; j < len; i++, j += 4) {
294 output[j] = (unsigned char)(input[i] & 0xff);
295 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
296 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
297 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
298 }
299 }
300
301 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
302 a multiple of 4.
303 */
Decode(UINT4 * output,const unsigned char * input,unsigned int len)304 static void Decode (UINT4 *output, const unsigned char *input, unsigned int len)
305 {
306 unsigned int i, j;
307
308 for (i = 0, j = 0; j < len; i++, j += 4)
309 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
310 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
311 }
312
313 /* Note: Replace "for loop" with standard memcpy if possible.
314 */
315 #ifndef HAVE_MEMCPY
MD5_memcpy(POINTER output,POINTER input,unsigned int len)316 static void MD5_memcpy (POINTER output, POINTER input, unsigned int len)
317 {
318 unsigned int i;
319
320 for (i = 0; i < len; i++)
321
322 output[i] = input[i];
323 }
324 #endif
325 /* Note: Replace "for loop" with standard memset if possible.
326 */
327 #ifndef HAVE_MEMSET
MD5_memset(POINTER output,int value,unsigned int len)328 static void MD5_memset (POINTER output, int value, unsigned int len)
329 {
330 unsigned int i;
331
332 for (i = 0; i < len; i++)
333 ((char *)output)[i] = (char)value;
334 }
335 #endif
336 #endif
337