/* ========================================================================== * 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: * * 2020-10-03 (Sebastian Pipping) * - Drop support for Visual Studio 9.0/2008 and earlier * * 2019-08-03 (Sebastian Pipping) * - Mark part of sip24_valid as to be excluded from clang-format * - Re-format code using clang-format 9 * * 2018-07-08 (Anton Maklakov) * - Add "fall through" markers for GCC's -Wimplicit-fallthrough * * 2017-11-03 (Sebastian Pipping) * - Hide sip_tobin and sip_binof unless SIPHASH_TOBIN macro is defined * * 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 /* size_t */ #include /* uint64_t uint32_t uint8_t */ /* * 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() */ #ifdef SIPHASH_TOBIN # 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() */ #endif /* SIPHASH_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; /* fall through */ case 6: b |= (uint64_t)H->buf[5] << 40; /* fall through */ case 5: b |= (uint64_t)H->buf[4] << 32; /* fall through */ case 4: b |= (uint64_t)H->buf[3] << 24; /* fall through */ case 3: b |= (uint64_t)H->buf[2] << 16; /* fall through */ case 2: b |= (uint64_t)H->buf[1] << 8; /* fall through */ case 1: b |= (uint64_t)H->buf[0] << 0; /* fall through */ 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) { /* clang-format off */ 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, } }; /* clang-format on */ 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 int main(void) { const int ok = sip24_valid(); if (ok) puts("OK"); else puts("FAIL"); return ! ok; } /* main() */ #endif /* SIPHASH_MAIN */ #endif /* SIPHASH_H */