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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 #include "md5.h"
27
28 /* Constants for MD5Transform routine.
29 */
30 #define S11 7
31 #define S12 12
32 #define S13 17
33 #define S14 22
34 #define S21 5
35 #define S22 9
36 #define S23 14
37 #define S24 20
38 #define S31 4
39 #define S32 11
40 #define S33 16
41 #define S34 23
42 #define S41 6
43 #define S42 10
44 #define S43 15
45 #define S44 21
46
47 static void MD5Transform PROTO_LIST ((UINT4 [4], const unsigned char [64]));
48 static void Encode PROTO_LIST
49 ((unsigned char *, UINT4 *, unsigned int));
50 static void Decode PROTO_LIST
51 ((UINT4 *, const unsigned char *, unsigned int));
52 static void MD5_memcpy PROTO_LIST ((POINTER, CPOINTER, unsigned int));
53 static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
54
55 static unsigned char PADDING[64] = {
56 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
57 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
58 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
59 };
60
61 /* F, G, H and I are basic MD5 functions.
62 */
63 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
64 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
65 #define H(x, y, z) ((x) ^ (y) ^ (z))
66 #define I(x, y, z) ((y) ^ ((x) | (~z)))
67
68 /* ROTATE_LEFT rotates x left n bits.
69 */
70 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
71
72 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
73 Rotation is separate from addition to prevent recomputation.
74 */
75 #define FF(a, b, c, d, x, s, ac) { \
76 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
77 (a) = ROTATE_LEFT ((a), (s)); \
78 (a) += (b); \
79 }
80 #define GG(a, b, c, d, x, s, ac) { \
81 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
82 (a) = ROTATE_LEFT ((a), (s)); \
83 (a) += (b); \
84 }
85 #define HH(a, b, c, d, x, s, ac) { \
86 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
87 (a) = ROTATE_LEFT ((a), (s)); \
88 (a) += (b); \
89 }
90 #define II(a, b, c, d, x, s, ac) { \
91 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
92 (a) = ROTATE_LEFT ((a), (s)); \
93 (a) += (b); \
94 }
95
96 void md5_calc(output, input, inlen)
97 unsigned char *output;
98 unsigned char *input; /* input block */
99 unsigned int inlen; /* length of input block */
100 {
101 MD5_CTX context;
102
103 MD5Init(&context);
104 MD5Update(&context, input, inlen);
105 MD5Final(output, &context);
106 }
107
108 /* MD5 initialization. Begins an MD5 operation, writing a new context.
109 */
110 void MD5Init (context)
111 MD5_CTX *context; /* context */
112 {
113 context->count[0] = context->count[1] = 0;
114 /* Load magic initialization constants.
115 */
116 context->state[0] = 0x67452301;
117 context->state[1] = 0xefcdab89;
118 context->state[2] = 0x98badcfe;
119 context->state[3] = 0x10325476;
120 }
121
122 /* MD5 block update operation. Continues an MD5 message-digest
123 operation, processing another message block, and updating the
124 context.
125 */
126 void MD5Update (context, input, inputLen)
127 MD5_CTX *context; /* context */
128 const unsigned char *input; /* input block */
129 unsigned int inputLen; /* length of input block */
130 {
131 unsigned int i, index, partLen;
132
133 /* Compute number of bytes mod 64 */
134 index = (unsigned int)((context->count[0] >> 3) & 0x3F);
135
136 /* Update number of bits */
137 if ((context->count[0] += ((UINT4)inputLen << 3))
138 < ((UINT4)inputLen << 3))
139 context->count[1]++;
140 context->count[1] += ((UINT4)inputLen >> 29);
141
142 partLen = 64 - index;
143
144 /* Transform as many times as possible.
145 */
146 if (inputLen >= partLen) {
147 MD5_memcpy
148 ((POINTER)&context->buffer[index], (CPOINTER)input, partLen);
149 MD5Transform (context->state, context->buffer);
150
151 for (i = partLen; i + 63 < inputLen; i += 64)
152 MD5Transform (context->state, &input[i]);
153
154 index = 0;
155 }
156 else
157 i = 0;
158
159 /* Buffer remaining input */
160 MD5_memcpy
161 ((POINTER)&context->buffer[index], (CPOINTER)&input[i],
162 inputLen-i);
163 }
164
165 /* MD5 finalization. Ends an MD5 message-digest operation, writing the
166 the message digest and zeroizing the context.
167 */
168 void MD5Final (digest, context)
169 unsigned char digest[16]; /* message digest */
170 MD5_CTX *context; /* context */
171 {
172 unsigned char bits[8];
173 unsigned int index, padLen;
174
175 /* Save number of bits */
176 Encode (bits, context->count, 8);
177
178 /* Pad out to 56 mod 64.
179 */
180 index = (unsigned int)((context->count[0] >> 3) & 0x3f);
181 padLen = (index < 56) ? (56 - index) : (120 - index);
182 MD5Update (context, PADDING, padLen);
183
184 /* Append length (before padding) */
185 MD5Update (context, bits, 8);
186
187 /* Store state in digest */
188 Encode (digest, context->state, 16);
189
190 /* Zeroize sensitive information.
191 */
192 MD5_memset ((POINTER)context, 0, sizeof (*context));
193 }
194
195 /* MD5 basic transformation. Transforms state based on block.
196 */
197 static void MD5Transform (state, block)
198 UINT4 state[4];
199 const unsigned char block[64];
200 {
201 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
202
203 Decode (x, block, 64);
204
205 /* Round 1 */
206 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
207 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
208 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
209 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
210 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
211 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
212 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
213 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
214 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
215 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
216 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
217 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
218 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
219 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
220 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
221 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
222
223 /* Round 2 */
224 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
225 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
226 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
227 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
228 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
229 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
230 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
231 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
232 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
233 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
234 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
235 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
236 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
237 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
238 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
239 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
240
241 /* Round 3 */
242 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
243 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
244 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
245 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
246 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
247 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
248 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
249 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
250 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
251 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
252 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
253 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
254 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
255 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
256 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
257 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
258
259 /* Round 4 */
260 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
261 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
262 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
263 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
264 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
265 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
266 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
267 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
268 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
269 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
270 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
271 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
272 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
273 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
274 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
275 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
276
277 state[0] += a;
278 state[1] += b;
279 state[2] += c;
280 state[3] += d;
281
282 /* Zeroize sensitive information.
283 */
284 MD5_memset ((POINTER)x, 0, sizeof (x));
285 }
286
287 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
288 a multiple of 4.
289 */
290 static void Encode (output, input, len)
291 unsigned char *output;
292 UINT4 *input;
293 unsigned int len;
294 {
295 unsigned int i, j;
296
297 for (i = 0, j = 0; j < len; i++, j += 4) {
298 output[j] = (unsigned char)(input[i] & 0xff);
299 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
300 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
301 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
302 }
303 }
304
305 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
306 a multiple of 4.
307 */
308 static void Decode (output, input, len)
309 UINT4 *output;
310 const unsigned char *input;
311 unsigned int len;
312 {
313 unsigned int i, j;
314
315 for (i = 0, j = 0; j < len; i++, j += 4)
316 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
317 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
318 }
319
320 /* Note: Replace "for loop" with standard memcpy if possible.
321 */
322
323 static void MD5_memcpy (output, input, len)
324 POINTER output;
325 CPOINTER input;
326 unsigned int len;
327 {
328 unsigned int i;
329
330 for (i = 0; i < len; i++)
331 output[i] = input[i];
332 }
333
334 /* Note: Replace "for loop" with standard memset if possible.
335 */
336 static void MD5_memset (output, value, len)
337 POINTER output;
338 int value;
339 unsigned int len;
340 {
341 unsigned int i;
342
343 for (i = 0; i < len; i++)
344 ((char *)output)[i] = (char)value;
345 }