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	#ifndef SIPHASH_H
	#define SIPHASH_H 1
	#include <stdlib.h>
	#ifdef HAVE_STDINT_H
	#include <stdint.h>
	#endif
	#ifdef HAVE_INTTYPES_H
	#include <inttypes.h>
	#endif

	#ifndef HAVE_UINT64_T
	typedef struct {
	uint32_t u32[2];
	} sip_uint64_t;
	#define uint64_t sip_uint64_t
	#else
	typedef uint64_t sip_uint64_t;
	#endif

	typedef struct {
	int c;
	int d;
	uint64_t v[4];
	uint8_t buf[sizeof(uint64_t)];
	uint8_t buflen;
	uint8_t msglen_byte;
	} sip_state;

	typedef struct sip_interface_st sip_interface;

	typedef struct {
	sip_state state[1];
	const sip_interface *methods;
	} sip_hash;

	sip_hash *sip_hash_new(const uint8_t key[16], int c, int d);
	sip_hash sip_hash_init(sip_hash h, const uint8_t key[16], int c, int d);
	int sip_hash_update(sip_hash h, const uint8_t data, size_t len);
	int sip_hash_final(sip_hash h, uint8_t digest, size_t len);
	int sip_hash_final_integer(sip_hash h, uint64_t digest);
	int sip_hash_digest(sip_hash h, const uint8_t data, size_t data_len, uint8_t *digest, size_t digest_len);
	int sip_hash_digest_integer(sip_hash h, const uint8_t data, size_t data_len, uint64_t *digest);
	void sip_hash_free(sip_hash *h);
	void sip_hash_dump(sip_hash *h);

	NO_SANITIZE("unsigned-integer-overflow", uint64_t sip_hash13(const uint8_t key[16], const uint8_t *data, size_t len));

	#endif

ruby/siphash.h