GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libexpat/lib/siphash.h Lines: 52 69 75.4 %
Date: 2017-11-13 Branches: 18 22 81.8 %

Line Branch Exec Source
1
/* ==========================================================================
2
 * siphash.h - SipHash-2-4 in a single header file
3
 * --------------------------------------------------------------------------
4
 * Derived by William Ahern from the reference implementation[1] published[2]
5
 * by Jean-Philippe Aumasson and Daniel J. Berstein.
6
 * Minimal changes by Sebastian Pipping and Victor Stinner on top, see below.
7
 * Licensed under the CC0 Public Domain Dedication license.
8
 *
9
 * 1. https://www.131002.net/siphash/siphash24.c
10
 * 2. https://www.131002.net/siphash/
11
 * --------------------------------------------------------------------------
12
 * HISTORY:
13
 *
14
 * 2017-07-25  (Vadim Zeitlin)
15
 *   - Fix use of SIPHASH_MAIN macro
16
 *
17
 * 2017-07-05  (Sebastian Pipping)
18
 *   - Use _SIP_ULL macro to not require a C++11 compiler if compiled as C++
19
 *   - Add const qualifiers at two places
20
 *   - Ensure <=80 characters line length (assuming tab width 4)
21
 *
22
 * 2017-06-23  (Victor Stinner)
23
 *   - Address Win64 compile warnings
24
 *
25
 * 2017-06-18  (Sebastian Pipping)
26
 *   - Clarify license note in the header
27
 *   - Address C89 issues:
28
 *     - Stop using inline keyword (and let compiler decide)
29
 *     - Replace _Bool by int
30
 *     - Turn macro siphash24 into a function
31
 *     - Address invalid conversion (void pointer) by explicit cast
32
 *   - Address lack of stdint.h for Visual Studio 2003 to 2008
33
 *   - Always expose sip24_valid (for self-tests)
34
 *
35
 * 2012-11-04 - Born.  (William Ahern)
36
 * --------------------------------------------------------------------------
37
 * USAGE:
38
 *
39
 * SipHash-2-4 takes as input two 64-bit words as the key, some number of
40
 * message bytes, and outputs a 64-bit word as the message digest. This
41
 * implementation employs two data structures: a struct sipkey for
42
 * representing the key, and a struct siphash for representing the hash
43
 * state.
44
 *
45
 * For converting a 16-byte unsigned char array to a key, use either the
46
 * macro sip_keyof or the routine sip_tokey. The former instantiates a
47
 * compound literal key, while the latter requires a key object as a
48
 * parameter.
49
 *
50
 * 	unsigned char secret[16];
51
 * 	arc4random_buf(secret, sizeof secret);
52
 * 	struct sipkey *key = sip_keyof(secret);
53
 *
54
 * For hashing a message, use either the convenience macro siphash24 or the
55
 * routines sip24_init, sip24_update, and sip24_final.
56
 *
57
 * 	struct siphash state;
58
 * 	void *msg;
59
 * 	size_t len;
60
 * 	uint64_t hash;
61
 *
62
 * 	sip24_init(&state, key);
63
 * 	sip24_update(&state, msg, len);
64
 * 	hash = sip24_final(&state);
65
 *
66
 * or
67
 *
68
 * 	hash = siphash24(msg, len, key);
69
 *
70
 * To convert the 64-bit hash value to a canonical 8-byte little-endian
71
 * binary representation, use either the macro sip_binof or the routine
72
 * sip_tobin. The former instantiates and returns a compound literal array,
73
 * while the latter requires an array object as a parameter.
74
 * --------------------------------------------------------------------------
75
 * NOTES:
76
 *
77
 * o Neither sip_keyof, sip_binof, nor siphash24 will work with compilers
78
 *   lacking compound literal support. Instead, you must use the lower-level
79
 *   interfaces which take as parameters the temporary state objects.
80
 *
81
 * o Uppercase macros may evaluate parameters more than once. Lowercase
82
 *   macros should not exhibit any such side effects.
83
 * ==========================================================================
84
 */
85
#ifndef SIPHASH_H
86
#define SIPHASH_H
87
88
#include <stddef.h> /* size_t */
89
90
#if defined(_WIN32) && defined(_MSC_VER) && (_MSC_VER < 1600)
91
  /* For vs2003/7.1 up to vs2008/9.0; _MSC_VER 1600 is vs2010/10.0 */
92
  typedef unsigned __int8   uint8_t;
93
  typedef unsigned __int32 uint32_t;
94
  typedef unsigned __int64 uint64_t;
95
#else
96
 #include <stdint.h> /* uint64_t uint32_t uint8_t */
97
#endif
98
99
100
/*
101
 * Workaround to not require a C++11 compiler for using ULL suffix
102
 * if this code is included and compiled as C++; related GCC warning is:
103
 * warning: use of C++11 long long integer constant [-Wlong-long]
104
 */
105
#define _SIP_ULL(high, low)  (((uint64_t)high << 32) | low)
106
107
108
#define SIP_ROTL(x, b) (uint64_t)(((x) << (b)) | ( (x) >> (64 - (b))))
109
110
#define SIP_U32TO8_LE(p, v) \
111
	(p)[0] = (uint8_t)((v) >>  0); (p)[1] = (uint8_t)((v) >>  8); \
112
	(p)[2] = (uint8_t)((v) >> 16); (p)[3] = (uint8_t)((v) >> 24);
113
114
#define SIP_U64TO8_LE(p, v) \
115
	SIP_U32TO8_LE((p) + 0, (uint32_t)((v) >>  0)); \
116
	SIP_U32TO8_LE((p) + 4, (uint32_t)((v) >> 32));
117
118
#define SIP_U8TO64_LE(p) \
119
	(((uint64_t)((p)[0]) <<  0) | \
120
	 ((uint64_t)((p)[1]) <<  8) | \
121
	 ((uint64_t)((p)[2]) << 16) | \
122
	 ((uint64_t)((p)[3]) << 24) | \
123
	 ((uint64_t)((p)[4]) << 32) | \
124
	 ((uint64_t)((p)[5]) << 40) | \
125
	 ((uint64_t)((p)[6]) << 48) | \
126
	 ((uint64_t)((p)[7]) << 56))
127
128
129
#define SIPHASH_INITIALIZER { 0, 0, 0, 0, { 0 }, 0, 0 }
130
131
struct siphash {
132
	uint64_t v0, v1, v2, v3;
133
134
	unsigned char buf[8], *p;
135
	uint64_t c;
136
}; /* struct siphash */
137
138
139
#define SIP_KEYLEN 16
140
141
struct sipkey {
142
	uint64_t k[2];
143
}; /* struct sipkey */
144
145
#define sip_keyof(k) sip_tokey(&(struct sipkey){ { 0 } }, (k))
146
147
static struct sipkey *sip_tokey(struct sipkey *key, const void *src) {
148
	key->k[0] = SIP_U8TO64_LE((const unsigned char *)src);
149
	key->k[1] = SIP_U8TO64_LE((const unsigned char *)src + 8);
150
	return key;
151
} /* sip_tokey() */
152
153
154
#define sip_binof(v) sip_tobin((unsigned char[8]){ 0 }, (v))
155
156
static void *sip_tobin(void *dst, uint64_t u64) {
157
	SIP_U64TO8_LE((unsigned char *)dst, u64);
158
	return dst;
159
} /* sip_tobin() */
160
161
162
static void sip_round(struct siphash *H, const int rounds) {
163
	int i;
164
165
276959251
	for (i = 0; i < rounds; i++) {
166
91046174
		H->v0 += H->v1;
167
91046174
		H->v1 = SIP_ROTL(H->v1, 13);
168
91046174
		H->v1 ^= H->v0;
169
91046174
		H->v0 = SIP_ROTL(H->v0, 32);
170
171
91046174
		H->v2 += H->v3;
172
91046174
		H->v3 = SIP_ROTL(H->v3, 16);
173
91046174
		H->v3 ^= H->v2;
174
175
91046174
		H->v0 += H->v3;
176
91046174
		H->v3 = SIP_ROTL(H->v3, 21);
177
91046174
		H->v3 ^= H->v0;
178
179
91046174
		H->v2 += H->v1;
180
91046174
		H->v1 = SIP_ROTL(H->v1, 17);
181
91046174
		H->v1 ^= H->v2;
182
91046174
		H->v2 = SIP_ROTL(H->v2, 32);
183
	}
184
31622301
} /* sip_round() */
185
186
187
static struct siphash *sip24_init(struct siphash *H,
188
		const struct sipkey *key) {
189
27801632
	H->v0 = _SIP_ULL(0x736f6d65U, 0x70736575U) ^ key->k[0];
190
13900816
	H->v1 = _SIP_ULL(0x646f7261U, 0x6e646f6dU) ^ key->k[1];
191
13900816
	H->v2 = _SIP_ULL(0x6c796765U, 0x6e657261U) ^ key->k[0];
192
13900816
	H->v3 = _SIP_ULL(0x74656462U, 0x79746573U) ^ key->k[1];
193
194
13900816
	H->p = H->buf;
195
13900816
	H->c = 0;
196
197
13900816
	return H;
198
} /* sip24_init() */
199
200
201
#define sip_endof(a) (&(a)[sizeof (a) / sizeof *(a)])
202
203
static struct siphash *sip24_update(struct siphash *H, const void *src,
204
		size_t len) {
205
27801896
	const unsigned char *p = (const unsigned char *)src, *pe = p + len;
206
	uint64_t m;
207
208
13900948
	do {
209

301067516
		while (p < pe && H->p < sip_endof(H->buf))
210
88978579
			*H->p++ = *p++;
211
212
16010909
		if (H->p < sip_endof(H->buf))
213
			break;
214
215
3820729
		m = SIP_U8TO64_LE(H->buf);
216
3820729
		H->v3 ^= m;
217
3820729
		sip_round(H, 2);
218
3820729
		H->v0 ^= m;
219
220
3820729
		H->p = H->buf;
221
3820729
		H->c += 8;
222
3820729
	} while (p < pe);
223
224
13900948
	return H;
225
} /* sip24_update() */
226
227
228
static uint64_t sip24_final(struct siphash *H) {
229
86214295
	const char left = (char)(H->p - H->buf);
230
72313509
	uint64_t b = (H->c + left) << 56;
231
232


72313509
	switch (left) {
233
3150381
	case 7: b |= (uint64_t)H->buf[6] << 48;
234
4111074
	case 6: b |= (uint64_t)H->buf[5] << 40;
235
7413180
	case 5: b |= (uint64_t)H->buf[4] << 32;
236
9633588
	case 4: b |= (uint64_t)H->buf[3] << 24;
237
10426048
	case 3: b |= (uint64_t)H->buf[2] << 16;
238
11488434
	case 2: b |= (uint64_t)H->buf[1] << 8;
239
12190018
	case 1: b |= (uint64_t)H->buf[0] << 0;
240
	case 0: break;
241
	}
242
243
13900786
	H->v3 ^= b;
244
13900786
	sip_round(H, 2);
245
13900786
	H->v0 ^= b;
246
13900786
	H->v2 ^= 0xff;
247
13900786
	sip_round(H, 4);
248
249
13900786
	return H->v0 ^ H->v1 ^ H->v2  ^ H->v3;
250
} /* sip24_final() */
251
252
253
static uint64_t siphash24(const void *src, size_t len,
254
		const struct sipkey *key) {
255
	struct siphash state = SIPHASH_INITIALIZER;
256
	return sip24_final(sip24_update(sip24_init(&state, key), src, len));
257
} /* siphash24() */
258
259
260
/*
261
 * SipHash-2-4 output with
262
 * k = 00 01 02 ...
263
 * and
264
 * in = (empty string)
265
 * in = 00 (1 byte)
266
 * in = 00 01 (2 bytes)
267
 * in = 00 01 02 (3 bytes)
268
 * ...
269
 * in = 00 01 02 ... 3e (63 bytes)
270
 */
271
static int sip24_valid(void) {
272
	static const unsigned char vectors[64][8] = {
273
		{ 0x31, 0x0e, 0x0e, 0xdd, 0x47, 0xdb, 0x6f, 0x72, },
274
		{ 0xfd, 0x67, 0xdc, 0x93, 0xc5, 0x39, 0xf8, 0x74, },
275
		{ 0x5a, 0x4f, 0xa9, 0xd9, 0x09, 0x80, 0x6c, 0x0d, },
276
		{ 0x2d, 0x7e, 0xfb, 0xd7, 0x96, 0x66, 0x67, 0x85, },
277
		{ 0xb7, 0x87, 0x71, 0x27, 0xe0, 0x94, 0x27, 0xcf, },
278
		{ 0x8d, 0xa6, 0x99, 0xcd, 0x64, 0x55, 0x76, 0x18, },
279
		{ 0xce, 0xe3, 0xfe, 0x58, 0x6e, 0x46, 0xc9, 0xcb, },
280
		{ 0x37, 0xd1, 0x01, 0x8b, 0xf5, 0x00, 0x02, 0xab, },
281
		{ 0x62, 0x24, 0x93, 0x9a, 0x79, 0xf5, 0xf5, 0x93, },
282
		{ 0xb0, 0xe4, 0xa9, 0x0b, 0xdf, 0x82, 0x00, 0x9e, },
283
		{ 0xf3, 0xb9, 0xdd, 0x94, 0xc5, 0xbb, 0x5d, 0x7a, },
284
		{ 0xa7, 0xad, 0x6b, 0x22, 0x46, 0x2f, 0xb3, 0xf4, },
285
		{ 0xfb, 0xe5, 0x0e, 0x86, 0xbc, 0x8f, 0x1e, 0x75, },
286
		{ 0x90, 0x3d, 0x84, 0xc0, 0x27, 0x56, 0xea, 0x14, },
287
		{ 0xee, 0xf2, 0x7a, 0x8e, 0x90, 0xca, 0x23, 0xf7, },
288
		{ 0xe5, 0x45, 0xbe, 0x49, 0x61, 0xca, 0x29, 0xa1, },
289
		{ 0xdb, 0x9b, 0xc2, 0x57, 0x7f, 0xcc, 0x2a, 0x3f, },
290
		{ 0x94, 0x47, 0xbe, 0x2c, 0xf5, 0xe9, 0x9a, 0x69, },
291
		{ 0x9c, 0xd3, 0x8d, 0x96, 0xf0, 0xb3, 0xc1, 0x4b, },
292
		{ 0xbd, 0x61, 0x79, 0xa7, 0x1d, 0xc9, 0x6d, 0xbb, },
293
		{ 0x98, 0xee, 0xa2, 0x1a, 0xf2, 0x5c, 0xd6, 0xbe, },
294
		{ 0xc7, 0x67, 0x3b, 0x2e, 0xb0, 0xcb, 0xf2, 0xd0, },
295
		{ 0x88, 0x3e, 0xa3, 0xe3, 0x95, 0x67, 0x53, 0x93, },
296
		{ 0xc8, 0xce, 0x5c, 0xcd, 0x8c, 0x03, 0x0c, 0xa8, },
297
		{ 0x94, 0xaf, 0x49, 0xf6, 0xc6, 0x50, 0xad, 0xb8, },
298
		{ 0xea, 0xb8, 0x85, 0x8a, 0xde, 0x92, 0xe1, 0xbc, },
299
		{ 0xf3, 0x15, 0xbb, 0x5b, 0xb8, 0x35, 0xd8, 0x17, },
300
		{ 0xad, 0xcf, 0x6b, 0x07, 0x63, 0x61, 0x2e, 0x2f, },
301
		{ 0xa5, 0xc9, 0x1d, 0xa7, 0xac, 0xaa, 0x4d, 0xde, },
302
		{ 0x71, 0x65, 0x95, 0x87, 0x66, 0x50, 0xa2, 0xa6, },
303
		{ 0x28, 0xef, 0x49, 0x5c, 0x53, 0xa3, 0x87, 0xad, },
304
		{ 0x42, 0xc3, 0x41, 0xd8, 0xfa, 0x92, 0xd8, 0x32, },
305
		{ 0xce, 0x7c, 0xf2, 0x72, 0x2f, 0x51, 0x27, 0x71, },
306
		{ 0xe3, 0x78, 0x59, 0xf9, 0x46, 0x23, 0xf3, 0xa7, },
307
		{ 0x38, 0x12, 0x05, 0xbb, 0x1a, 0xb0, 0xe0, 0x12, },
308
		{ 0xae, 0x97, 0xa1, 0x0f, 0xd4, 0x34, 0xe0, 0x15, },
309
		{ 0xb4, 0xa3, 0x15, 0x08, 0xbe, 0xff, 0x4d, 0x31, },
310
		{ 0x81, 0x39, 0x62, 0x29, 0xf0, 0x90, 0x79, 0x02, },
311
		{ 0x4d, 0x0c, 0xf4, 0x9e, 0xe5, 0xd4, 0xdc, 0xca, },
312
		{ 0x5c, 0x73, 0x33, 0x6a, 0x76, 0xd8, 0xbf, 0x9a, },
313
		{ 0xd0, 0xa7, 0x04, 0x53, 0x6b, 0xa9, 0x3e, 0x0e, },
314
		{ 0x92, 0x59, 0x58, 0xfc, 0xd6, 0x42, 0x0c, 0xad, },
315
		{ 0xa9, 0x15, 0xc2, 0x9b, 0xc8, 0x06, 0x73, 0x18, },
316
		{ 0x95, 0x2b, 0x79, 0xf3, 0xbc, 0x0a, 0xa6, 0xd4, },
317
		{ 0xf2, 0x1d, 0xf2, 0xe4, 0x1d, 0x45, 0x35, 0xf9, },
318
		{ 0x87, 0x57, 0x75, 0x19, 0x04, 0x8f, 0x53, 0xa9, },
319
		{ 0x10, 0xa5, 0x6c, 0xf5, 0xdf, 0xcd, 0x9a, 0xdb, },
320
		{ 0xeb, 0x75, 0x09, 0x5c, 0xcd, 0x98, 0x6c, 0xd0, },
321
		{ 0x51, 0xa9, 0xcb, 0x9e, 0xcb, 0xa3, 0x12, 0xe6, },
322
		{ 0x96, 0xaf, 0xad, 0xfc, 0x2c, 0xe6, 0x66, 0xc7, },
323
		{ 0x72, 0xfe, 0x52, 0x97, 0x5a, 0x43, 0x64, 0xee, },
324
		{ 0x5a, 0x16, 0x45, 0xb2, 0x76, 0xd5, 0x92, 0xa1, },
325
		{ 0xb2, 0x74, 0xcb, 0x8e, 0xbf, 0x87, 0x87, 0x0a, },
326
		{ 0x6f, 0x9b, 0xb4, 0x20, 0x3d, 0xe7, 0xb3, 0x81, },
327
		{ 0xea, 0xec, 0xb2, 0xa3, 0x0b, 0x22, 0xa8, 0x7f, },
328
		{ 0x99, 0x24, 0xa4, 0x3c, 0xc1, 0x31, 0x57, 0x24, },
329
		{ 0xbd, 0x83, 0x8d, 0x3a, 0xaf, 0xbf, 0x8d, 0xb7, },
330
		{ 0x0b, 0x1a, 0x2a, 0x32, 0x65, 0xd5, 0x1a, 0xea, },
331
		{ 0x13, 0x50, 0x79, 0xa3, 0x23, 0x1c, 0xe6, 0x60, },
332
		{ 0x93, 0x2b, 0x28, 0x46, 0xe4, 0xd7, 0x06, 0x66, },
333
		{ 0xe1, 0x91, 0x5f, 0x5c, 0xb1, 0xec, 0xa4, 0x6c, },
334
		{ 0xf3, 0x25, 0x96, 0x5c, 0xa1, 0x6d, 0x62, 0x9f, },
335
		{ 0x57, 0x5f, 0xf2, 0x8e, 0x60, 0x38, 0x1b, 0xe5, },
336
		{ 0x72, 0x45, 0x06, 0xeb, 0x4c, 0x32, 0x8a, 0x95, }
337
	};
338
	unsigned char in[64];
339
	struct sipkey k;
340
	size_t i;
341
342
	sip_tokey(&k, "\000\001\002\003\004\005\006\007\010\011"
343
			"\012\013\014\015\016\017");
344
345
	for (i = 0; i < sizeof in; ++i) {
346
		in[i] = (unsigned char)i;
347
348
		if (siphash24(in, i, &k) != SIP_U8TO64_LE(vectors[i]))
349
			return 0;
350
	}
351
352
	return 1;
353
} /* sip24_valid() */
354
355
356
#ifdef SIPHASH_MAIN
357
358
#include <stdio.h>
359
360
int main(void) {
361
	const int ok = sip24_valid();
362
363
	if (ok)
364
		puts("OK");
365
	else
366
		puts("FAIL");
367
368
	return !ok;
369
} /* main() */
370
371
#endif /* SIPHASH_MAIN */
372
373
374
#endif /* SIPHASH_H */