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[awesomized/libmemcached] / libhashkit / md5.c
1 /*
2 This Library has been modified from its original form by
3 Brian Aker (brian@tangent.org)
4
5 See below for original Copyright.
6 */
7 /* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
8 */
9
10 /* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
11 rights reserved.
12
13 License to copy and use this software is granted provided that it
14 is identified as the "RSA Data Security, Inc. MD5 Message-Digest
15 Algorithm" in all material mentioning or referencing this software
16 or this function.
17
18 License is also granted to make and use derivative works provided
19 that such works are identified as "derived from the RSA Data
20 Security, Inc. MD5 Message-Digest Algorithm" in all material
21 mentioning or referencing the derived work.
22
23 RSA Data Security, Inc. makes no representations concerning either
24 the merchantability of this software or the suitability of this
25 software for any particular purpose. It is provided "as is"
26 without express or implied warranty of any kind.
27
28 These notices must be retained in any copies of any part of this
29 documentation and/or software.
30 */
31
32 #include "common.h"
33
34 #include <string.h>
35 #include <sys/types.h>
36
37 /* POINTER defines a generic pointer type */
38 typedef unsigned char *POINTER;
39
40
41 /* UINT4 defines a four byte word */
42 typedef unsigned int UINT4;
43
44
45 /* MD5 context. */
46 typedef struct {
47 UINT4 state[4]; /* state (ABCD) */
48 UINT4 count[2]; /* number of bits, modulo 2^64 (lsb first) */
49 unsigned char buffer[64]; /* input buffer */
50 } MD5_CTX;
51
52 static void MD5Init (MD5_CTX *context); /* context */
53 static void MD5Update ( MD5_CTX *context, /* context */
54 const unsigned char *input, /* input block */
55 unsigned int inputLen); /* length of input block */
56 static void MD5Final ( unsigned char digest[16], /* message digest */
57 MD5_CTX *context); /* context */
58
59 /* Constants for MD5Transform routine. */
60
61 #define S11 7
62 #define S12 12
63 #define S13 17
64 #define S14 22
65 #define S21 5
66 #define S22 9
67 #define S23 14
68 #define S24 20
69 #define S31 4
70 #define S32 11
71 #define S33 16
72 #define S34 23
73 #define S41 6
74 #define S42 10
75 #define S43 15
76 #define S44 21
77
78
79 static void MD5Transform (UINT4 state[4],
80 unsigned char block[64]);
81 static void Encode (unsigned char *output,
82 UINT4 *input,
83 unsigned int len);
84 static void Decode(UINT4 *output, unsigned char *input, unsigned int len);
85
86 static unsigned char PADDING[64] = {
87 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
88 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
89 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
90 };
91
92 /* F, G, H and I are basic MD5 functions.
93 */
94 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
95 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
96 #define H(x, y, z) ((x) ^ (y) ^ (z))
97 #define I(x, y, z) ((y) ^ ((x) | (~z)))
98
99 /* ROTATE_LEFT rotates x left n bits.
100 */
101 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
102
103 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
104 Rotation is separate from addition to prevent recomputation.
105 */
106 #define FF(a, b, c, d, x, s, ac) { \
107 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
108 (a) = ROTATE_LEFT ((a), (s)); \
109 (a) += (b); \
110 }
111 #define GG(a, b, c, d, x, s, ac) { \
112 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
113 (a) = ROTATE_LEFT ((a), (s)); \
114 (a) += (b); \
115 }
116 #define HH(a, b, c, d, x, s, ac) { \
117 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
118 (a) = ROTATE_LEFT ((a), (s)); \
119 (a) += (b); \
120 }
121 #define II(a, b, c, d, x, s, ac) { \
122 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
123 (a) = ROTATE_LEFT ((a), (s)); \
124 (a) += (b); \
125 }
126
127
128 /*
129 Just a simple method for getting the signature
130 result must be == 16
131 */
132 void md5_signature(const unsigned char *key, unsigned int length, unsigned char *result)
133 {
134 MD5_CTX my_md5;
135
136 MD5Init(&my_md5);
137 (void)MD5Update(&my_md5, key, length);
138 MD5Final(result, &my_md5);
139 }
140
141 /* MD5 initialization. Begins an MD5 operation, writing a new context.
142 */
143 static void MD5Init (MD5_CTX *context) /* context */
144 {
145 context->count[0] = context->count[1] = 0;
146 /* Load magic initialization constants.
147 */
148 context->state[0] = 0x67452301;
149 context->state[1] = 0xefcdab89;
150 context->state[2] = 0x98badcfe;
151 context->state[3] = 0x10325476;
152 }
153
154 /* MD5 block update operation. Continues an MD5 message-digest
155 operation, processing another message block, and updating the
156 context.
157 */
158
159 static void MD5Update (
160 MD5_CTX *context, /* context */
161 const unsigned char *input, /* input block */
162 unsigned int inputLen) /* length of input block */
163 {
164 unsigned int i, idx, partLen;
165
166 /* Compute number of bytes mod 64 */
167 idx = (unsigned int)((context->count[0] >> 3) & 0x3F);
168
169
170 /* Update number of bits */
171 if ((context->count[0] += ((UINT4)inputLen << 3))
172 < ((UINT4)inputLen << 3))
173 context->count[1]++;
174 context->count[1] += ((UINT4)inputLen >> 29);
175
176 partLen = 64 - idx;
177
178 /* Transform as many times as possible.
179 */
180 if (inputLen >= partLen) {
181 memcpy((POINTER)&context->buffer[idx], (POINTER)input, partLen);
182 MD5Transform(context->state, context->buffer);
183
184 for (i = partLen; i + 63 < inputLen; i += 64)
185 MD5Transform (context->state, (unsigned char *)&input[i]);
186
187 idx = 0;
188 }
189 else
190 i = 0;
191
192 /* Buffer remaining input */
193 memcpy((POINTER)&context->buffer[idx], (POINTER)&input[i],
194 inputLen-i);
195 }
196
197 /* MD5 finalization. Ends an MD5 message-digest operation, writing the
198 the message digest and zeroizing the context.
199 */
200
201 static void MD5Final (
202 unsigned char digest[16], /* message digest */
203 MD5_CTX *context) /* context */
204 {
205 unsigned char bits[8];
206 unsigned int idx, padLen;
207
208 /* Save number of bits */
209 Encode (bits, context->count, 8);
210
211 /* Pad out to 56 mod 64.
212 */
213 idx = (unsigned int)((context->count[0] >> 3) & 0x3f);
214 padLen = (idx < 56) ? (56 - idx) : (120 - idx);
215 MD5Update (context, PADDING, padLen);
216
217 /* Append length (before padding) */
218 MD5Update (context, bits, 8);
219
220 /* Store state in digest */
221 Encode (digest, context->state, 16);
222
223 /* Zeroize sensitive information.
224 */
225 memset((POINTER)context, 0, sizeof (*context));
226 }
227
228 /* MD5 basic transformation. Transforms state based on block.
229 */
230 static void MD5Transform (
231 UINT4 state[4],
232 unsigned char block[64])
233 {
234 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
235
236 Decode (x, block, 64);
237
238 /* Round 1 */
239 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
240 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
241 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
242 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
243 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
244 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
245 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
246 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
247 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
248 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
249 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
250 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
251 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
252 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
253 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
254 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
255
256 /* Round 2 */
257 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
258 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
259 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
260 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
261 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
262 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
263 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
264 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
265 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
266 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
267 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
268 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
269 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
270 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
271 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
272 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
273
274 /* Round 3 */
275 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
276 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
277 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
278 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
279 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
280 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
281 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
282 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
283 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
284 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
285 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
286 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
287 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
288 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
289 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
290 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
291
292 /* Round 4 */
293 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
294 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
295 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
296 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
297 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
298 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
299 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
300 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
301 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
302 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
303 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
304 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
305 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
306 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
307 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
308 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
309
310
311 state[0] += a;
312 state[1] += b;
313 state[2] += c;
314 state[3] += d;
315
316 /* Zeroize sensitive information.
317 */
318 memset((POINTER)x, 0, sizeof (x));
319 }
320
321 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
322 a multiple of 4.
323 */
324 static void Encode (
325 unsigned char *output,
326 UINT4 *input,
327 unsigned int len)
328 {
329 unsigned int i, j;
330
331 for (i = 0, j = 0; j < len; i++, j += 4) {
332 output[j] = (unsigned char)(input[i] & 0xff);
333 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
334 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
335 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
336 }
337 }
338
339
340 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
341 a multiple of 4.
342 */
343 static void Decode (
344 UINT4 *output,
345 unsigned char *input,
346 unsigned int len)
347 {
348 unsigned int i, j;
349
350 for (i = 0, j = 0; j < len; i++, j += 4)
351 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
352 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
353 }
354
355 uint32_t hashkit_md5(const char *key, size_t key_length, void *context __attribute__((unused)))
356 {
357 unsigned char results[16];
358
359 md5_signature((unsigned char*)key, (unsigned int)key_length, results);
360
361 return ((uint32_t) (results[3] & 0xFF) << 24)
362 | ((uint32_t) (results[2] & 0xFF) << 16)
363 | ((uint32_t) (results[1] & 0xFF) << 8)
364 | (results[0] & 0xFF);
365 }