Head

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 %


/* ==========================================================================
 * siphash.h - SipHash-2-4 in a single header file
 * --------------------------------------------------------------------------
 * Derived by William Ahern from the reference implementation[1] published[2]
 * by Jean-Philippe Aumasson and Daniel J. Berstein.
 * Minimal changes by Sebastian Pipping and Victor Stinner on top, see below.
 * Licensed under the CC0 Public Domain Dedication license.
 *
 * 1. https://www.131002.net/siphash/siphash24.c
 * 2. https://www.131002.net/siphash/
 * --------------------------------------------------------------------------
 * HISTORY:
 *
 * 2017-07-25  (Vadim Zeitlin)
 *   - Fix use of SIPHASH_MAIN macro
 *
 * 2017-07-05  (Sebastian Pipping)
 *   - Use _SIP_ULL macro to not require a C++11 compiler if compiled as C++
 *   - Add const qualifiers at two places
 *   - Ensure <=80 characters line length (assuming tab width 4)
 *
 * 2017-06-23  (Victor Stinner)
 *   - Address Win64 compile warnings
 *
 * 2017-06-18  (Sebastian Pipping)
 *   - Clarify license note in the header
 *   - Address C89 issues:
 *     - Stop using inline keyword (and let compiler decide)
 *     - Replace _Bool by int
 *     - Turn macro siphash24 into a function
 *     - Address invalid conversion (void pointer) by explicit cast
 *   - Address lack of stdint.h for Visual Studio 2003 to 2008
 *   - Always expose sip24_valid (for self-tests)
 *
 * 2012-11-04 - Born.  (William Ahern)
 * --------------------------------------------------------------------------
 * USAGE:
 *
 * SipHash-2-4 takes as input two 64-bit words as the key, some number of
 * message bytes, and outputs a 64-bit word as the message digest. This
 * implementation employs two data structures: a struct sipkey for
 * representing the key, and a struct siphash for representing the hash
 * state.
 *
 * For converting a 16-byte unsigned char array to a key, use either the
 * macro sip_keyof or the routine sip_tokey. The former instantiates a
 * compound literal key, while the latter requires a key object as a
 * parameter.
 *
 * 	unsigned char secret[16];
 * 	arc4random_buf(secret, sizeof secret);
 * 	struct sipkey *key = sip_keyof(secret);
 *
 * For hashing a message, use either the convenience macro siphash24 or the
 * routines sip24_init, sip24_update, and sip24_final.
 *
 * 	struct siphash state;
 * 	void *msg;
 * 	size_t len;
 * 	uint64_t hash;
 *
 * 	sip24_init(&state, key);
 * 	sip24_update(&state, msg, len);
 * 	hash = sip24_final(&state);
 *
 * or
 *
 * 	hash = siphash24(msg, len, key);
 *
 * To convert the 64-bit hash value to a canonical 8-byte little-endian
 * binary representation, use either the macro sip_binof or the routine
 * sip_tobin. The former instantiates and returns a compound literal array,
 * while the latter requires an array object as a parameter.
 * --------------------------------------------------------------------------
 * NOTES:
 *
 * o Neither sip_keyof, sip_binof, nor siphash24 will work with compilers
 *   lacking compound literal support. Instead, you must use the lower-level
 *   interfaces which take as parameters the temporary state objects.
 *
 * o Uppercase macros may evaluate parameters more than once. Lowercase
 *   macros should not exhibit any such side effects.
 * ==========================================================================
 */
#ifndef SIPHASH_H
#define SIPHASH_H

#include <stddef.h> /* size_t */

#if defined(_WIN32) && defined(_MSC_VER) && (_MSC_VER < 1600)
  /* For vs2003/7.1 up to vs2008/9.0; _MSC_VER 1600 is vs2010/10.0 */
  typedef unsigned __int8   uint8_t;
  typedef unsigned __int32 uint32_t;
  typedef unsigned __int64 uint64_t;
#else
 #include <stdint.h> /* uint64_t uint32_t uint8_t */
#endif


/*
 * Workaround to not require a C++11 compiler for using ULL suffix
 * if this code is included and compiled as C++; related GCC warning is:
 * warning: use of C++11 long long integer constant [-Wlong-long]
 */
#define _SIP_ULL(high, low)  (((uint64_t)high << 32) | low)


#define SIP_ROTL(x, b) (uint64_t)(((x) << (b)) | ( (x) >> (64 - (b))))

#define SIP_U32TO8_LE(p, v) \
	(p)[0] = (uint8_t)((v) >>  0); (p)[1] = (uint8_t)((v) >>  8); \
	(p)[2] = (uint8_t)((v) >> 16); (p)[3] = (uint8_t)((v) >> 24);

#define SIP_U64TO8_LE(p, v) \
	SIP_U32TO8_LE((p) + 0, (uint32_t)((v) >>  0)); \
	SIP_U32TO8_LE((p) + 4, (uint32_t)((v) >> 32));

#define SIP_U8TO64_LE(p) \
	(((uint64_t)((p)[0]) <<  0) | \
	 ((uint64_t)((p)[1]) <<  8) | \
	 ((uint64_t)((p)[2]) << 16) | \
	 ((uint64_t)((p)[3]) << 24) | \
	 ((uint64_t)((p)[4]) << 32) | \
	 ((uint64_t)((p)[5]) << 40) | \
	 ((uint64_t)((p)[6]) << 48) | \
	 ((uint64_t)((p)[7]) << 56))


#define SIPHASH_INITIALIZER { 0, 0, 0, 0, { 0 }, 0, 0 }

struct siphash {
	uint64_t v0, v1, v2, v3;

	unsigned char buf[8], *p;
	uint64_t c;
}; /* struct siphash */


#define SIP_KEYLEN 16

struct sipkey {
	uint64_t k[2];
}; /* struct sipkey */

#define sip_keyof(k) sip_tokey(&(struct sipkey){ { 0 } }, (k))

static struct sipkey *sip_tokey(struct sipkey *key, const void *src) {
	key->k[0] = SIP_U8TO64_LE((const unsigned char *)src);
	key->k[1] = SIP_U8TO64_LE((const unsigned char *)src + 8);
	return key;
} /* sip_tokey() */


#define sip_binof(v) sip_tobin((unsigned char[8]){ 0 }, (v))

static void *sip_tobin(void *dst, uint64_t u64) {
	SIP_U64TO8_LE((unsigned char *)dst, u64);
	return dst;
} /* sip_tobin() */


static void sip_round(struct siphash *H, const int rounds) {
	int i;

	for (i = 0; i < rounds; i++) {
		H->v0 += H->v1;
		H->v1 = SIP_ROTL(H->v1, 13);
		H->v1 ^= H->v0;
		H->v0 = SIP_ROTL(H->v0, 32);

		H->v2 += H->v3;
		H->v3 = SIP_ROTL(H->v3, 16);
		H->v3 ^= H->v2;

		H->v0 += H->v3;
		H->v3 = SIP_ROTL(H->v3, 21);
		H->v3 ^= H->v0;

		H->v2 += H->v1;
		H->v1 = SIP_ROTL(H->v1, 17);
		H->v1 ^= H->v2;
		H->v2 = SIP_ROTL(H->v2, 32);
	}
} /* sip_round() */


static struct siphash *sip24_init(struct siphash *H,
		const struct sipkey *key) {
	H->v0 = _SIP_ULL(0x736f6d65U, 0x70736575U) ^ key->k[0];
	H->v1 = _SIP_ULL(0x646f7261U, 0x6e646f6dU) ^ key->k[1];
	H->v2 = _SIP_ULL(0x6c796765U, 0x6e657261U) ^ key->k[0];
	H->v3 = _SIP_ULL(0x74656462U, 0x79746573U) ^ key->k[1];

	H->p = H->buf;
	H->c = 0;

	return H;
} /* sip24_init() */


#define sip_endof(a) (&(a)[sizeof (a) / sizeof *(a)])

static struct siphash *sip24_update(struct siphash *H, const void *src,
		size_t len) {
	const unsigned char *p = (const unsigned char *)src, *pe = p + len;
	uint64_t m;

	do {
		while (p < pe && H->p < sip_endof(H->buf))
			*H->p++ = *p++;

		if (H->p < sip_endof(H->buf))
			break;

		m = SIP_U8TO64_LE(H->buf);
		H->v3 ^= m;
		sip_round(H, 2);
		H->v0 ^= m;

		H->p = H->buf;
		H->c += 8;
	} while (p < pe);

	return H;
} /* sip24_update() */


static uint64_t sip24_final(struct siphash *H) {
	const char left = (char)(H->p - H->buf);
	uint64_t b = (H->c + left) << 56;

	switch (left) {
	case 7: b |= (uint64_t)H->buf[6] << 48;
	case 6: b |= (uint64_t)H->buf[5] << 40;
	case 5: b |= (uint64_t)H->buf[4] << 32;
	case 4: b |= (uint64_t)H->buf[3] << 24;
	case 3: b |= (uint64_t)H->buf[2] << 16;
	case 2: b |= (uint64_t)H->buf[1] << 8;
	case 1: b |= (uint64_t)H->buf[0] << 0;
	case 0: break;
	}

	H->v3 ^= b;
	sip_round(H, 2);
	H->v0 ^= b;
	H->v2 ^= 0xff;
	sip_round(H, 4);

	return H->v0 ^ H->v1 ^ H->v2  ^ H->v3;
} /* sip24_final() */


static uint64_t siphash24(const void *src, size_t len,
		const struct sipkey *key) {
	struct siphash state = SIPHASH_INITIALIZER;
	return sip24_final(sip24_update(sip24_init(&state, key), src, len));
} /* siphash24() */


/*
 * SipHash-2-4 output with
 * k = 00 01 02 ...
 * and
 * in = (empty string)
 * in = 00 (1 byte)
 * in = 00 01 (2 bytes)
 * in = 00 01 02 (3 bytes)
 * ...
 * in = 00 01 02 ... 3e (63 bytes)
 */
static int sip24_valid(void) {
	static const unsigned char vectors[64][8] = {
		{ 0x31, 0x0e, 0x0e, 0xdd, 0x47, 0xdb, 0x6f, 0x72, },
		{ 0xfd, 0x67, 0xdc, 0x93, 0xc5, 0x39, 0xf8, 0x74, },
		{ 0x5a, 0x4f, 0xa9, 0xd9, 0x09, 0x80, 0x6c, 0x0d, },
		{ 0x2d, 0x7e, 0xfb, 0xd7, 0x96, 0x66, 0x67, 0x85, },
		{ 0xb7, 0x87, 0x71, 0x27, 0xe0, 0x94, 0x27, 0xcf, },
		{ 0x8d, 0xa6, 0x99, 0xcd, 0x64, 0x55, 0x76, 0x18, },
		{ 0xce, 0xe3, 0xfe, 0x58, 0x6e, 0x46, 0xc9, 0xcb, },
		{ 0x37, 0xd1, 0x01, 0x8b, 0xf5, 0x00, 0x02, 0xab, },
		{ 0x62, 0x24, 0x93, 0x9a, 0x79, 0xf5, 0xf5, 0x93, },
		{ 0xb0, 0xe4, 0xa9, 0x0b, 0xdf, 0x82, 0x00, 0x9e, },
		{ 0xf3, 0xb9, 0xdd, 0x94, 0xc5, 0xbb, 0x5d, 0x7a, },
		{ 0xa7, 0xad, 0x6b, 0x22, 0x46, 0x2f, 0xb3, 0xf4, },
		{ 0xfb, 0xe5, 0x0e, 0x86, 0xbc, 0x8f, 0x1e, 0x75, },
		{ 0x90, 0x3d, 0x84, 0xc0, 0x27, 0x56, 0xea, 0x14, },
		{ 0xee, 0xf2, 0x7a, 0x8e, 0x90, 0xca, 0x23, 0xf7, },
		{ 0xe5, 0x45, 0xbe, 0x49, 0x61, 0xca, 0x29, 0xa1, },
		{ 0xdb, 0x9b, 0xc2, 0x57, 0x7f, 0xcc, 0x2a, 0x3f, },
		{ 0x94, 0x47, 0xbe, 0x2c, 0xf5, 0xe9, 0x9a, 0x69, },
		{ 0x9c, 0xd3, 0x8d, 0x96, 0xf0, 0xb3, 0xc1, 0x4b, },
		{ 0xbd, 0x61, 0x79, 0xa7, 0x1d, 0xc9, 0x6d, 0xbb, },
		{ 0x98, 0xee, 0xa2, 0x1a, 0xf2, 0x5c, 0xd6, 0xbe, },
		{ 0xc7, 0x67, 0x3b, 0x2e, 0xb0, 0xcb, 0xf2, 0xd0, },
		{ 0x88, 0x3e, 0xa3, 0xe3, 0x95, 0x67, 0x53, 0x93, },
		{ 0xc8, 0xce, 0x5c, 0xcd, 0x8c, 0x03, 0x0c, 0xa8, },
		{ 0x94, 0xaf, 0x49, 0xf6, 0xc6, 0x50, 0xad, 0xb8, },
		{ 0xea, 0xb8, 0x85, 0x8a, 0xde, 0x92, 0xe1, 0xbc, },
		{ 0xf3, 0x15, 0xbb, 0x5b, 0xb8, 0x35, 0xd8, 0x17, },
		{ 0xad, 0xcf, 0x6b, 0x07, 0x63, 0x61, 0x2e, 0x2f, },
		{ 0xa5, 0xc9, 0x1d, 0xa7, 0xac, 0xaa, 0x4d, 0xde, },
		{ 0x71, 0x65, 0x95, 0x87, 0x66, 0x50, 0xa2, 0xa6, },
		{ 0x28, 0xef, 0x49, 0x5c, 0x53, 0xa3, 0x87, 0xad, },
		{ 0x42, 0xc3, 0x41, 0xd8, 0xfa, 0x92, 0xd8, 0x32, },
		{ 0xce, 0x7c, 0xf2, 0x72, 0x2f, 0x51, 0x27, 0x71, },
		{ 0xe3, 0x78, 0x59, 0xf9, 0x46, 0x23, 0xf3, 0xa7, },
		{ 0x38, 0x12, 0x05, 0xbb, 0x1a, 0xb0, 0xe0, 0x12, },
		{ 0xae, 0x97, 0xa1, 0x0f, 0xd4, 0x34, 0xe0, 0x15, },
		{ 0xb4, 0xa3, 0x15, 0x08, 0xbe, 0xff, 0x4d, 0x31, },
		{ 0x81, 0x39, 0x62, 0x29, 0xf0, 0x90, 0x79, 0x02, },
		{ 0x4d, 0x0c, 0xf4, 0x9e, 0xe5, 0xd4, 0xdc, 0xca, },
		{ 0x5c, 0x73, 0x33, 0x6a, 0x76, 0xd8, 0xbf, 0x9a, },
		{ 0xd0, 0xa7, 0x04, 0x53, 0x6b, 0xa9, 0x3e, 0x0e, },
		{ 0x92, 0x59, 0x58, 0xfc, 0xd6, 0x42, 0x0c, 0xad, },
		{ 0xa9, 0x15, 0xc2, 0x9b, 0xc8, 0x06, 0x73, 0x18, },
		{ 0x95, 0x2b, 0x79, 0xf3, 0xbc, 0x0a, 0xa6, 0xd4, },
		{ 0xf2, 0x1d, 0xf2, 0xe4, 0x1d, 0x45, 0x35, 0xf9, },
		{ 0x87, 0x57, 0x75, 0x19, 0x04, 0x8f, 0x53, 0xa9, },
		{ 0x10, 0xa5, 0x6c, 0xf5, 0xdf, 0xcd, 0x9a, 0xdb, },
		{ 0xeb, 0x75, 0x09, 0x5c, 0xcd, 0x98, 0x6c, 0xd0, },
		{ 0x51, 0xa9, 0xcb, 0x9e, 0xcb, 0xa3, 0x12, 0xe6, },
		{ 0x96, 0xaf, 0xad, 0xfc, 0x2c, 0xe6, 0x66, 0xc7, },
		{ 0x72, 0xfe, 0x52, 0x97, 0x5a, 0x43, 0x64, 0xee, },
		{ 0x5a, 0x16, 0x45, 0xb2, 0x76, 0xd5, 0x92, 0xa1, },
		{ 0xb2, 0x74, 0xcb, 0x8e, 0xbf, 0x87, 0x87, 0x0a, },
		{ 0x6f, 0x9b, 0xb4, 0x20, 0x3d, 0xe7, 0xb3, 0x81, },
		{ 0xea, 0xec, 0xb2, 0xa3, 0x0b, 0x22, 0xa8, 0x7f, },
		{ 0x99, 0x24, 0xa4, 0x3c, 0xc1, 0x31, 0x57, 0x24, },
		{ 0xbd, 0x83, 0x8d, 0x3a, 0xaf, 0xbf, 0x8d, 0xb7, },
		{ 0x0b, 0x1a, 0x2a, 0x32, 0x65, 0xd5, 0x1a, 0xea, },
		{ 0x13, 0x50, 0x79, 0xa3, 0x23, 0x1c, 0xe6, 0x60, },
		{ 0x93, 0x2b, 0x28, 0x46, 0xe4, 0xd7, 0x06, 0x66, },
		{ 0xe1, 0x91, 0x5f, 0x5c, 0xb1, 0xec, 0xa4, 0x6c, },
		{ 0xf3, 0x25, 0x96, 0x5c, 0xa1, 0x6d, 0x62, 0x9f, },
		{ 0x57, 0x5f, 0xf2, 0x8e, 0x60, 0x38, 0x1b, 0xe5, },
		{ 0x72, 0x45, 0x06, 0xeb, 0x4c, 0x32, 0x8a, 0x95, }
	};
	unsigned char in[64];
	struct sipkey k;
	size_t i;

	sip_tokey(&k, "\000\001\002\003\004\005\006\007\010\011"
			"\012\013\014\015\016\017");

	for (i = 0; i < sizeof in; ++i) {
		in[i] = (unsigned char)i;

		if (siphash24(in, i, &k) != SIP_U8TO64_LE(vectors[i]))
			return 0;
	}

	return 1;
} /* sip24_valid() */


#ifdef SIPHASH_MAIN

#include <stdio.h>

int main(void) {
	const int ok = sip24_valid();

	if (ok)
		puts("OK");
	else
		puts("FAIL");

	return !ok;
} /* main() */

#endif /* SIPHASH_MAIN */


#endif /* SIPHASH_H */


Generated by: GCOVR (Version 3.3)

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 */