--- /dev/null
+/* ==========================================================================
+ * 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. Licensed in kind.
+ *
+ * 1. https://www.131002.net/siphash/siphash24.c
+ * 2. https://www.131002.net/siphash/
+ * --------------------------------------------------------------------------
+ * HISTORY:
+ *
+ * 2012-11-04 - Born.
+ * --------------------------------------------------------------------------
+ * 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 */
+#include <stdint.h> /* uint64_t uint32_t uint8_t */
+
+
+#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 inline 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 inline void *sip_tobin(void *dst, uint64_t u64) {
+ SIP_U64TO8_LE((unsigned char *)dst, u64);
+ return dst;
+} /* sip_tobin() */
+
+
+static inline 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 inline struct siphash *sip24_init(struct siphash *H, const struct sipkey *key) {
+ H->v0 = 0x736f6d6570736575ULL ^ key->k[0];
+ H->v1 = 0x646f72616e646f6dULL ^ key->k[1];
+ H->v2 = 0x6c7967656e657261ULL ^ key->k[0];
+ H->v3 = 0x7465646279746573ULL ^ key->k[1];
+
+ H->p = H->buf;
+ H->c = 0;
+
+ return H;
+} /* sip24_init() */
+
+
+#define sip_endof(a) (&(a)[sizeof (a) / sizeof *(a)])
+
+static inline struct siphash *sip24_update(struct siphash *H, const void *src, size_t len) {
+ const unsigned char *p = 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 inline uint64_t sip24_final(struct siphash *H) {
+ char left = 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() */
+
+
+#define siphash24(src, len, key) \
+ sip24_final(sip24_update(sip24_init(&(struct siphash)SIPHASH_INITIALIZER, (key)), (src), (len)))
+
+
+#if SIPHASH_MAIN
+
+/*
+ * 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 inline _Bool 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] = i;
+
+ if (siphash24(in, i, &k) != SIP_U8TO64_LE(vectors[i]))
+ return 0;
+ }
+
+ return 1;
+} /* sip24_valid() */
+
+
+#include <stdio.h>
+
+int main(void) {
+ _Bool ok = sip24_valid();
+
+ if (ok)
+ puts("OK");
+ else
+ puts("FAIL");
+
+ return !ok;
+} /* main() */
+
+#endif /* SIPHASH_MAIN */
+
+
+#endif /* SIPHASH_H */
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