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[awesomized/libmemcached] / libhashkit / md5.cc
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 <libhashkit/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 typedef const unsigned char *CONST_POINTER;
40
41
42 /* UINT4 defines a four byte word */
43 typedef unsigned int UINT4;
44
45
46 /* MD5 context. */
47 typedef struct {
48 UINT4 state[4]; /* state (ABCD) */
49 UINT4 count[2]; /* number of bits, modulo 2^64 (lsb first) */
50 unsigned char buffer[64]; /* input buffer */
51 } MD5_CTX;
52
53 static void MD5Init (MD5_CTX *context); /* context */
54 static void MD5Update ( MD5_CTX *context, /* context */
55 const unsigned char *input, /* input block */
56 unsigned int inputLen); /* length of input block */
57 static void MD5Final ( unsigned char digest[16], /* message digest */
58 MD5_CTX *context); /* context */
59
60 /* Constants for MD5Transform routine. */
61
62 #define S11 7
63 #define S12 12
64 #define S13 17
65 #define S14 22
66 #define S21 5
67 #define S22 9
68 #define S23 14
69 #define S24 20
70 #define S31 4
71 #define S32 11
72 #define S33 16
73 #define S34 23
74 #define S41 6
75 #define S42 10
76 #define S43 15
77 #define S44 21
78
79
80 static void MD5Transform (UINT4 state[4],
81 const unsigned char block[64]);
82 static void Encode (unsigned char *output,
83 UINT4 *input,
84 unsigned int len);
85 static void Decode(UINT4 *output, const unsigned char *input, unsigned int len);
86
87 static unsigned char PADDING[64] = {
88 0x80, 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, 0, 0, 0, 0,
90 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
91 };
92
93 /* F, G, H and I are basic MD5 functions.
94 */
95 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
96 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
97 #define H(x, y, z) ((x) ^ (y) ^ (z))
98 #define I(x, y, z) ((y) ^ ((x) | (~z)))
99
100 /* ROTATE_LEFT rotates x left n bits.
101 */
102 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
103
104 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
105 Rotation is separate from addition to prevent recomputation.
106 */
107 #define FF(a, b, c, d, x, s, ac) { \
108 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
109 (a) = ROTATE_LEFT ((a), (s)); \
110 (a) += (b); \
111 }
112 #define GG(a, b, c, d, x, s, ac) { \
113 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
114 (a) = ROTATE_LEFT ((a), (s)); \
115 (a) += (b); \
116 }
117 #define HH(a, b, c, d, x, s, ac) { \
118 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
119 (a) = ROTATE_LEFT ((a), (s)); \
120 (a) += (b); \
121 }
122 #define II(a, b, c, d, x, s, ac) { \
123 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
124 (a) = ROTATE_LEFT ((a), (s)); \
125 (a) += (b); \
126 }
127
128
129 /*
130 Just a simple method for getting the signature
131 result must be == 16
132 */
133 void md5_signature(const unsigned char *key, unsigned int length, unsigned char *result)
134 {
135 MD5_CTX my_md5;
136
137 MD5Init(&my_md5);
138 (void)MD5Update(&my_md5, key, length);
139 MD5Final(result, &my_md5);
140 }
141
142 /* MD5 initialization. Begins an MD5 operation, writing a new context.
143 */
144 static void MD5Init (MD5_CTX *context) /* context */
145 {
146 context->count[0] = context->count[1] = 0;
147 /* Load magic initialization constants.
148 */
149 context->state[0] = 0x67452301;
150 context->state[1] = 0xefcdab89;
151 context->state[2] = 0x98badcfe;
152 context->state[3] = 0x10325476;
153 }
154
155 /* MD5 block update operation. Continues an MD5 message-digest
156 operation, processing another message block, and updating the
157 context.
158 */
159
160 static void MD5Update (
161 MD5_CTX *context, /* context */
162 const unsigned char *input, /* input block */
163 unsigned int inputLen) /* length of input block */
164 {
165 unsigned int i, idx, partLen;
166
167 /* Compute number of bytes mod 64 */
168 idx = (unsigned int)((context->count[0] >> 3) & 0x3F);
169
170
171 /* Update number of bits */
172 if ((context->count[0] += ((UINT4)inputLen << 3))
173 < ((UINT4)inputLen << 3))
174 context->count[1]++;
175 context->count[1] += ((UINT4)inputLen >> 29);
176
177 partLen = 64 - idx;
178
179 /* Transform as many times as possible.
180 */
181 if (inputLen >= partLen) {
182 memcpy((POINTER)&context->buffer[idx], (CONST_POINTER)input, partLen);
183 MD5Transform(context->state, context->buffer);
184
185 for (i = partLen; i + 63 < inputLen; i += 64)
186 MD5Transform (context->state, (CONST_POINTER)&input[i]);
187
188 idx = 0;
189 }
190 else
191 i = 0;
192
193 /* Buffer remaining input */
194 memcpy((POINTER)&context->buffer[idx], (CONST_POINTER)&input[i],
195 inputLen-i);
196 }
197
198 /* MD5 finalization. Ends an MD5 message-digest operation, writing the
199 the message digest and zeroizing the context.
200 */
201
202 static void MD5Final (
203 unsigned char digest[16], /* message digest */
204 MD5_CTX *context) /* context */
205 {
206 unsigned char bits[8];
207 unsigned int idx, padLen;
208
209 /* Save number of bits */
210 Encode (bits, context->count, 8);
211
212 /* Pad out to 56 mod 64.
213 */
214 idx = (unsigned int)((context->count[0] >> 3) & 0x3f);
215 padLen = (idx < 56) ? (56 - idx) : (120 - idx);
216 MD5Update (context, PADDING, padLen);
217
218 /* Append length (before padding) */
219 MD5Update (context, bits, 8);
220
221 /* Store state in digest */
222 Encode (digest, context->state, 16);
223
224 /* Zeroize sensitive information.
225 */
226 memset((POINTER)context, 0, sizeof (*context));
227 }
228
229 /* MD5 basic transformation. Transforms state based on block.
230 */
231 static void MD5Transform (
232 UINT4 state[4],
233 const unsigned char block[64])
234 {
235 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
236
237 Decode (x, block, 64);
238
239 /* Round 1 */
240 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
241 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
242 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
243 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
244 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
245 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
246 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
247 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
248 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
249 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
250 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
251 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
252 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
253 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
254 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
255 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
256
257 /* Round 2 */
258 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
259 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
260 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
261 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
262 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
263 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
264 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
265 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
266 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
267 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
268 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
269 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
270 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
271 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
272 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
273 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
274
275 /* Round 3 */
276 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
277 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
278 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
279 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
280 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
281 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
282 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
283 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
284 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
285 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
286 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
287 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
288 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
289 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
290 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
291 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
292
293 /* Round 4 */
294 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
295 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
296 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
297 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
298 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
299 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
300 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
301 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
302 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
303 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
304 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
305 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
306 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
307 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
308 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
309 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
310
311
312 state[0] += a;
313 state[1] += b;
314 state[2] += c;
315 state[3] += d;
316
317 /* Zeroize sensitive information.
318 */
319 memset((POINTER)x, 0, sizeof (x));
320 }
321
322 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
323 a multiple of 4.
324 */
325 static void Encode (
326 unsigned char *output,
327 UINT4 *input,
328 unsigned int len)
329 {
330 unsigned int i, j;
331
332 for (i = 0, j = 0; j < len; i++, j += 4) {
333 output[j] = (unsigned char)(input[i] & 0xff);
334 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
335 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
336 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
337 }
338 }
339
340
341 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
342 a multiple of 4.
343 */
344 static void Decode (
345 UINT4 *output,
346 const unsigned char *input,
347 unsigned int len)
348 {
349 unsigned int i, j;
350
351 for (i = 0, j = 0; j < len; i++, j += 4)
352 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
353 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
354 }
355
356 uint32_t hashkit_md5(const char *key, size_t key_length, void *context)
357 {
358 unsigned char results[16];
359 (void)context;
360
361 md5_signature((unsigned char*)key, (unsigned int)key_length, results);
362
363 return ((uint32_t) (results[3] & 0xFF) << 24)
364 | ((uint32_t) (results[2] & 0xFF) << 16)
365 | ((uint32_t) (results[1] & 0xFF) << 8)
366 | (results[0] & 0xFF);
367 }
Resurrection of libmemcached