// vim:fileencoding=utf-8:foldmethod=marker

/**
 * Implementations of the SipHash-2-4-128, SipHash4-8-128, SipHash-2-4-64 and SipHash4-8-64
 * algorithms based on https://github.com/veorq/SipHash/blob/master/siphash.c
 */

#ifndef SIPHASH_H
#define SIPHASH_H

#include "hasher.h"
#include "../../stream/stream.h"
#include "../../../common/aliases/aliases.h"
#include "../../../common/platform/platform.h"

#ifdef WP_PLATFORM_CPP
BEGIN_C_LINKAGE
#endif // !WP_PLATFORM_CPP

#define WP_SIP_HASHER_MAGIC wpU64Const(0x5750534950485348)

typedef struct WpSipHasherKey {
	u64 lo;
	u64 hi;
} WpSipHasherKey;

typedef struct WpSipHasherData {
	WpSipHasherKey key;
	u64 magic;
	u64 compression;
	u64 finalisation;
} WpSipHasherData;

#ifdef WP_PLATFORM_CPP
#define wpSip24HasherData(KEY) (WpSipHasherData{(KEY), WP_SIP_HASHER_MAGIC, 2, 4})
#define wpSip48HasherData(KEY) (WpSipHasherData{(KEY), WP_SIP_HASHER_MAGIC, 4, 8})
#else
#define wpSip24HasherData(KEY) ((WpSipHasherData){                                                 \
	.key          = (KEY),                                                                           \
	.magic        = WP_SIP_HASHER_MAGIC,                                                             \
	.compression  = 2,                                                                               \
	.finalisation = 4,                                                                               \
})
#define wpSip48HasherData(KEY) ((WpSipHasherData){                                                 \
	.key          = (KEY),                                                                           \
	.magic        = WP_SIP_HASHER_MAGIC,                                                             \
	.compression  = 4,                                                                               \
	.finalisation = 8,                                                                               \
})
#endif

WpHasher   wpSipHasher(WpSipHasherData *data);
WpU128Hash wpSipHasher128(WpU8Stream *bytes, void *hasher_io);

#ifdef WP_PLATFORM_CPP
END_C_LINKAGE
#endif // !WP_PLATFORM_CPP

#endif // !SIPHASH_H