lib/siphash.c - pub/scm/linux/kernel/git/next/linux-next - Git at Google

 /* Copyright (C) 2016 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
  *
  * This file is provided under a dual BSD/GPLv2 license.
  *
  * SipHash: a fast short-input PRF
  * https://131002.net/siphash/
  *
  * This implementation is specifically for SipHash2-4 for a secure PRF
  * and HalfSipHash1-3/SipHash1-3 for an insecure PRF only suitable for
  * hashtables.
  */

 #include <linux/siphash.h>
 #include <asm/unaligned.h>

 #if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64
 #include <linux/dcache.h>
 #include <asm/word-at-a-time.h>
 #endif

 #define SIPROUND \
 	do { \
 	v0 += v1; v1 = rol64(v1, 13); v1 ^= v0; v0 = rol64(v0, 32); \
 	v2 += v3; v3 = rol64(v3, 16); v3 ^= v2; \
 	v0 += v3; v3 = rol64(v3, 21); v3 ^= v0; \
 	v2 += v1; v1 = rol64(v1, 17); v1 ^= v2; v2 = rol64(v2, 32); \
 	} while (0)

 #define PREAMBLE(len) \
 	u64 v0 = 0x736f6d6570736575ULL; \
 	u64 v1 = 0x646f72616e646f6dULL; \
 	u64 v2 = 0x6c7967656e657261ULL; \
 	u64 v3 = 0x7465646279746573ULL; \
 	u64 b = ((u64)(len)) << 56; \
 	v3 ^= key->key[1]; \
 	v2 ^= key->key[0]; \
 	v1 ^= key->key[1]; \
 	v0 ^= key->key[0];

 #define POSTAMBLE \
 	v3 ^= b; \
 	SIPROUND; \
 	SIPROUND; \
 	v0 ^= b; \
 	v2 ^= 0xff; \
 	SIPROUND; \
 	SIPROUND; \
 	SIPROUND; \
 	SIPROUND; \
 	return (v0 ^ v1) ^ (v2 ^ v3);

 u64 __siphash_aligned(const void *data, size_t len, const siphash_key_t *key)
 {
 	const u8 *end = data + len - (len % sizeof(u64));
 	const u8 left = len & (sizeof(u64) - 1);
 	u64 m;
 	PREAMBLE(len)
 	for (; data != end; data += sizeof(u64)) {
 		m = le64_to_cpup(data);
 		v3 ^= m;
 		SIPROUND;
 		SIPROUND;
 		v0 ^= m;
 	}
 #if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64
 	if (left)
 		b |= le64_to_cpu((__force __le64)(load_unaligned_zeropad(data) &
 						  bytemask_from_count(left)));
 #else
 	switch (left) {
 	case 7: b |= ((u64)end[6]) << 48; /* fall through */
 	case 6: b |= ((u64)end[5]) << 40; /* fall through */
 	case 5: b |= ((u64)end[4]) << 32; /* fall through */
 	case 4: b |= le32_to_cpup(data); break;
 	case 3: b |= ((u64)end[2]) << 16; /* fall through */
 	case 2: b |= le16_to_cpup(data); break;
 	case 1: b |= end[0];
 	}
 #endif
 	POSTAMBLE
 }
 EXPORT_SYMBOL(__siphash_aligned);

 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
 u64 __siphash_unaligned(const void *data, size_t len, const siphash_key_t *key)
 {
 	const u8 *end = data + len - (len % sizeof(u64));
 	const u8 left = len & (sizeof(u64) - 1);
 	u64 m;
 	PREAMBLE(len)
 	for (; data != end; data += sizeof(u64)) {
 		m = get_unaligned_le64(data);
 		v3 ^= m;
 		SIPROUND;
 		SIPROUND;
 		v0 ^= m;
 	}
 #if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64
 	if (left)
 		b |= le64_to_cpu((__force __le64)(load_unaligned_zeropad(data) &
 						  bytemask_from_count(left)));
 #else
 	switch (left) {
 	case 7: b |= ((u64)end[6]) << 48; /* fall through */
 	case 6: b |= ((u64)end[5]) << 40; /* fall through */
 	case 5: b |= ((u64)end[4]) << 32; /* fall through */
 	case 4: b |= get_unaligned_le32(end); break;
 	case 3: b |= ((u64)end[2]) << 16; /* fall through */
 	case 2: b |= get_unaligned_le16(end); break;
 	case 1: b |= end[0];
 	}
 #endif
 	POSTAMBLE
 }
 EXPORT_SYMBOL(__siphash_unaligned);
 #endif

 /**
  * siphash_1u64 - compute 64-bit siphash PRF value of a u64
  * @first: first u64
  * @key: the siphash key
  */
 u64 siphash_1u64(const u64 first, const siphash_key_t *key)
 {
 	PREAMBLE(8)
 	v3 ^= first;
 	SIPROUND;
 	SIPROUND;
 	v0 ^= first;
 	POSTAMBLE
 }
 EXPORT_SYMBOL(siphash_1u64);

 /**
  * siphash_2u64 - compute 64-bit siphash PRF value of 2 u64
  * @first: first u64
  * @second: second u64
  * @key: the siphash key
  */
 u64 siphash_2u64(const u64 first, const u64 second, const siphash_key_t *key)
 {
 	PREAMBLE(16)
 	v3 ^= first;
 	SIPROUND;
 	SIPROUND;
 	v0 ^= first;
 	v3 ^= second;
 	SIPROUND;
 	SIPROUND;
 	v0 ^= second;
 	POSTAMBLE
 }
 EXPORT_SYMBOL(siphash_2u64);

 /**
  * siphash_3u64 - compute 64-bit siphash PRF value of 3 u64
  * @first: first u64
  * @second: second u64
  * @third: third u64
  * @key: the siphash key
  */
 u64 siphash_3u64(const u64 first, const u64 second, const u64 third,
 		 const siphash_key_t *key)
 {
 	PREAMBLE(24)
 	v3 ^= first;
 	SIPROUND;
 	SIPROUND;
 	v0 ^= first;
 	v3 ^= second;
 	SIPROUND;
 	SIPROUND;
 	v0 ^= second;
 	v3 ^= third;
 	SIPROUND;
 	SIPROUND;
 	v0 ^= third;
 	POSTAMBLE
 }
 EXPORT_SYMBOL(siphash_3u64);

 /**
  * siphash_4u64 - compute 64-bit siphash PRF value of 4 u64
  * @first: first u64
  * @second: second u64
  * @third: third u64
  * @forth: forth u64
  * @key: the siphash key
  */
 u64 siphash_4u64(const u64 first, const u64 second, const u64 third,
 		 const u64 forth, const siphash_key_t *key)
 {
 	PREAMBLE(32)
 	v3 ^= first;
 	SIPROUND;
 	SIPROUND;
 	v0 ^= first;
 	v3 ^= second;
 	SIPROUND;
 	SIPROUND;
 	v0 ^= second;
 	v3 ^= third;
 	SIPROUND;
 	SIPROUND;
 	v0 ^= third;
 	v3 ^= forth;
 	SIPROUND;
 	SIPROUND;
 	v0 ^= forth;
 	POSTAMBLE
 }
 EXPORT_SYMBOL(siphash_4u64);

 u64 siphash_1u32(const u32 first, const siphash_key_t *key)
 {
 	PREAMBLE(4)
 	b |= first;
 	POSTAMBLE
 }
 EXPORT_SYMBOL(siphash_1u32);

 u64 siphash_3u32(const u32 first, const u32 second, const u32 third,
 		 const siphash_key_t *key)
 {
 	u64 combined = (u64)second << 32 | first;
 	PREAMBLE(12)
 	v3 ^= combined;
 	SIPROUND;
 	SIPROUND;
 	v0 ^= combined;
 	b |= third;
 	POSTAMBLE
 }
 EXPORT_SYMBOL(siphash_3u32);

 #if BITS_PER_LONG == 64
 /* Note that on 64-bit, we make HalfSipHash1-3 actually be SipHash1-3, for
  * performance reasons. On 32-bit, below, we actually implement HalfSipHash1-3.
  */

 #define HSIPROUND SIPROUND
 #define HPREAMBLE(len) PREAMBLE(len)
 #define HPOSTAMBLE \
 	v3 ^= b; \
 	HSIPROUND; \
 	v0 ^= b; \
 	v2 ^= 0xff; \
 	HSIPROUND; \
 	HSIPROUND; \
 	HSIPROUND; \
 	return (v0 ^ v1) ^ (v2 ^ v3);

 u32 __hsiphash_aligned(const void *data, size_t len, const hsiphash_key_t *key)
 {
 	const u8 *end = data + len - (len % sizeof(u64));
 	const u8 left = len & (sizeof(u64) - 1);
 	u64 m;
 	HPREAMBLE(len)
 	for (; data != end; data += sizeof(u64)) {
 		m = le64_to_cpup(data);
 		v3 ^= m;
 		HSIPROUND;
 		v0 ^= m;
 	}
 #if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64
 	if (left)
 		b |= le64_to_cpu((__force __le64)(load_unaligned_zeropad(data) &
 						  bytemask_from_count(left)));
 #else
 	switch (left) {
 	case 7: b |= ((u64)end[6]) << 48; /* fall through */
 	case 6: b |= ((u64)end[5]) << 40; /* fall through */
 	case 5: b |= ((u64)end[4]) << 32; /* fall through */
 	case 4: b |= le32_to_cpup(data); break;
 	case 3: b |= ((u64)end[2]) << 16; /* fall through */
 	case 2: b |= le16_to_cpup(data); break;
 	case 1: b |= end[0];
 	}
 #endif
 	HPOSTAMBLE
 }
 EXPORT_SYMBOL(__hsiphash_aligned);

 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
 u32 __hsiphash_unaligned(const void *data, size_t len,
 			 const hsiphash_key_t *key)
 {
 	const u8 *end = data + len - (len % sizeof(u64));
 	const u8 left = len & (sizeof(u64) - 1);
 	u64 m;
 	HPREAMBLE(len)
 	for (; data != end; data += sizeof(u64)) {
 		m = get_unaligned_le64(data);
 		v3 ^= m;
 		HSIPROUND;
 		v0 ^= m;
 	}
 #if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64
 	if (left)
 		b |= le64_to_cpu((__force __le64)(load_unaligned_zeropad(data) &
 						  bytemask_from_count(left)));
 #else
 	switch (left) {
 	case 7: b |= ((u64)end[6]) << 48; /* fall through */
 	case 6: b |= ((u64)end[5]) << 40; /* fall through */
 	case 5: b |= ((u64)end[4]) << 32; /* fall through */
 	case 4: b |= get_unaligned_le32(end); break;
 	case 3: b |= ((u64)end[2]) << 16; /* fall through */
 	case 2: b |= get_unaligned_le16(end); break;
 	case 1: b |= end[0];
 	}
 #endif
 	HPOSTAMBLE
 }
 EXPORT_SYMBOL(__hsiphash_unaligned);
 #endif

 /**
  * hsiphash_1u32 - compute 64-bit hsiphash PRF value of a u32
  * @first: first u32
  * @key: the hsiphash key
  */
 u32 hsiphash_1u32(const u32 first, const hsiphash_key_t *key)
 {
 	HPREAMBLE(4)
 	b |= first;
 	HPOSTAMBLE
 }
 EXPORT_SYMBOL(hsiphash_1u32);

 /**
  * hsiphash_2u32 - compute 32-bit hsiphash PRF value of 2 u32
  * @first: first u32
  * @second: second u32
  * @key: the hsiphash key
  */
 u32 hsiphash_2u32(const u32 first, const u32 second, const hsiphash_key_t *key)
 {
 	u64 combined = (u64)second << 32 | first;
 	HPREAMBLE(8)
 	v3 ^= combined;
 	HSIPROUND;
 	v0 ^= combined;
 	HPOSTAMBLE
 }
 EXPORT_SYMBOL(hsiphash_2u32);

 /**
  * hsiphash_3u32 - compute 32-bit hsiphash PRF value of 3 u32
  * @first: first u32
  * @second: second u32
  * @third: third u32
  * @key: the hsiphash key
  */
 u32 hsiphash_3u32(const u32 first, const u32 second, const u32 third,
 		  const hsiphash_key_t *key)
 {
 	u64 combined = (u64)second << 32 | first;
 	HPREAMBLE(12)
 	v3 ^= combined;
 	HSIPROUND;
 	v0 ^= combined;
 	b |= third;
 	HPOSTAMBLE
 }
 EXPORT_SYMBOL(hsiphash_3u32);

 /**
  * hsiphash_4u32 - compute 32-bit hsiphash PRF value of 4 u32
  * @first: first u32
  * @second: second u32
  * @third: third u32
  * @forth: forth u32
  * @key: the hsiphash key
  */
 u32 hsiphash_4u32(const u32 first, const u32 second, const u32 third,
 		  const u32 forth, const hsiphash_key_t *key)
 {
 	u64 combined = (u64)second << 32 | first;
 	HPREAMBLE(16)
 	v3 ^= combined;
 	HSIPROUND;
 	v0 ^= combined;
 	combined = (u64)forth << 32 | third;
 	v3 ^= combined;
 	HSIPROUND;
 	v0 ^= combined;
 	HPOSTAMBLE
 }
 EXPORT_SYMBOL(hsiphash_4u32);
 #else
 #define HSIPROUND \
 	do { \
 	v0 += v1; v1 = rol32(v1, 5); v1 ^= v0; v0 = rol32(v0, 16); \
 	v2 += v3; v3 = rol32(v3, 8); v3 ^= v2; \
 	v0 += v3; v3 = rol32(v3, 7); v3 ^= v0; \
 	v2 += v1; v1 = rol32(v1, 13); v1 ^= v2; v2 = rol32(v2, 16); \
 	} while (0)

 #define HPREAMBLE(len) \
 	u32 v0 = 0; \
 	u32 v1 = 0; \
 	u32 v2 = 0x6c796765U; \
 	u32 v3 = 0x74656462U; \
 	u32 b = ((u32)(len)) << 24; \
 	v3 ^= key->key[1]; \
 	v2 ^= key->key[0]; \
 	v1 ^= key->key[1]; \
 	v0 ^= key->key[0];

 #define HPOSTAMBLE \
 	v3 ^= b; \
 	HSIPROUND; \
 	v0 ^= b; \
 	v2 ^= 0xff; \
 	HSIPROUND; \
 	HSIPROUND; \
 	HSIPROUND; \
 	return v1 ^ v3;

 u32 __hsiphash_aligned(const void *data, size_t len, const hsiphash_key_t *key)
 {
 	const u8 *end = data + len - (len % sizeof(u32));
 	const u8 left = len & (sizeof(u32) - 1);
 	u32 m;
 	HPREAMBLE(len)
 	for (; data != end; data += sizeof(u32)) {
 		m = le32_to_cpup(data);
 		v3 ^= m;
 		HSIPROUND;
 		v0 ^= m;
 	}
 	switch (left) {
 	case 3: b |= ((u32)end[2]) << 16; /* fall through */
 	case 2: b |= le16_to_cpup(data); break;
 	case 1: b |= end[0];
 	}
 	HPOSTAMBLE
 }
 EXPORT_SYMBOL(__hsiphash_aligned);

 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
 u32 __hsiphash_unaligned(const void *data, size_t len,
 			 const hsiphash_key_t *key)
 {
 	const u8 *end = data + len - (len % sizeof(u32));
 	const u8 left = len & (sizeof(u32) - 1);
 	u32 m;
 	HPREAMBLE(len)
 	for (; data != end; data += sizeof(u32)) {
 		m = get_unaligned_le32(data);
 		v3 ^= m;
 		HSIPROUND;
 		v0 ^= m;
 	}
 	switch (left) {
 	case 3: b |= ((u32)end[2]) << 16; /* fall through */
 	case 2: b |= get_unaligned_le16(end); break;
 	case 1: b |= end[0];
 	}
 	HPOSTAMBLE
 }
 EXPORT_SYMBOL(__hsiphash_unaligned);
 #endif

 /**
  * hsiphash_1u32 - compute 32-bit hsiphash PRF value of a u32
  * @first: first u32
  * @key: the hsiphash key
  */
 u32 hsiphash_1u32(const u32 first, const hsiphash_key_t *key)
 {
 	HPREAMBLE(4)
 	v3 ^= first;
 	HSIPROUND;
 	v0 ^= first;
 	HPOSTAMBLE
 }
 EXPORT_SYMBOL(hsiphash_1u32);

 /**
  * hsiphash_2u32 - compute 32-bit hsiphash PRF value of 2 u32
  * @first: first u32
  * @second: second u32
  * @key: the hsiphash key
  */
 u32 hsiphash_2u32(const u32 first, const u32 second, const hsiphash_key_t *key)
 {
 	HPREAMBLE(8)
 	v3 ^= first;
 	HSIPROUND;
 	v0 ^= first;
 	v3 ^= second;
 	HSIPROUND;
 	v0 ^= second;
 	HPOSTAMBLE
 }
 EXPORT_SYMBOL(hsiphash_2u32);

 /**
  * hsiphash_3u32 - compute 32-bit hsiphash PRF value of 3 u32
  * @first: first u32
  * @second: second u32
  * @third: third u32
  * @key: the hsiphash key
  */
 u32 hsiphash_3u32(const u32 first, const u32 second, const u32 third,
 		  const hsiphash_key_t *key)
 {
 	HPREAMBLE(12)
 	v3 ^= first;
 	HSIPROUND;
 	v0 ^= first;
 	v3 ^= second;
 	HSIPROUND;
 	v0 ^= second;
 	v3 ^= third;
 	HSIPROUND;
 	v0 ^= third;
 	HPOSTAMBLE
 }
 EXPORT_SYMBOL(hsiphash_3u32);

 /**
  * hsiphash_4u32 - compute 32-bit hsiphash PRF value of 4 u32
  * @first: first u32
  * @second: second u32
  * @third: third u32
  * @forth: forth u32
  * @key: the hsiphash key
  */
 u32 hsiphash_4u32(const u32 first, const u32 second, const u32 third,
 		  const u32 forth, const hsiphash_key_t *key)
 {
 	HPREAMBLE(16)
 	v3 ^= first;
 	HSIPROUND;
 	v0 ^= first;
 	v3 ^= second;
 	HSIPROUND;
 	v0 ^= second;
 	v3 ^= third;
 	HSIPROUND;
 	v0 ^= third;
 	v3 ^= forth;
 	HSIPROUND;
 	v0 ^= forth;
 	HPOSTAMBLE
 }
 EXPORT_SYMBOL(hsiphash_4u32);
 #endif
	/* Copyright (C) 2016 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
	*
	* This file is provided under a dual BSD/GPLv2 license.
	*
	* SipHash: a fast short-input PRF
	* https://131002.net/siphash/
	*
	* This implementation is specifically for SipHash2-4 for a secure PRF
	* and HalfSipHash1-3/SipHash1-3 for an insecure PRF only suitable for
	* hashtables.
	*/

	#include <linux/siphash.h>
	#include <asm/unaligned.h>

	#if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64
	#include <linux/dcache.h>
	#include <asm/word-at-a-time.h>
	#endif

	#define SIPROUND \
	do { \
	v0 += v1; v1 = rol64(v1, 13); v1 ^= v0; v0 = rol64(v0, 32); \
	v2 += v3; v3 = rol64(v3, 16); v3 ^= v2; \
	v0 += v3; v3 = rol64(v3, 21); v3 ^= v0; \
	v2 += v1; v1 = rol64(v1, 17); v1 ^= v2; v2 = rol64(v2, 32); \
	} while (0)

	#define PREAMBLE(len) \
	u64 v0 = 0x736f6d6570736575ULL; \
	u64 v1 = 0x646f72616e646f6dULL; \
	u64 v2 = 0x6c7967656e657261ULL; \
	u64 v3 = 0x7465646279746573ULL; \
	u64 b = ((u64)(len)) << 56; \
	v3 ^= key->key[1]; \
	v2 ^= key->key[0]; \
	v1 ^= key->key[1]; \
	v0 ^= key->key[0];

	#define POSTAMBLE \
	v3 ^= b; \
	SIPROUND; \
	SIPROUND; \
	v0 ^= b; \
	v2 ^= 0xff; \
	SIPROUND; \
	SIPROUND; \
	SIPROUND; \
	SIPROUND; \
	return (v0 ^ v1) ^ (v2 ^ v3);

	u64 __siphash_aligned(const void data, size_t len, const siphash_key_t key)
	{
	const u8 *end = data + len - (len % sizeof(u64));
	const u8 left = len & (sizeof(u64) - 1);
	u64 m;
	PREAMBLE(len)
	for (; data != end; data += sizeof(u64)) {
	m = le64_to_cpup(data);
	v3 ^= m;
	SIPROUND;
	SIPROUND;
	v0 ^= m;
	}
	#if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64
	if (left)
	b \|= le64_to_cpu((__force __le64)(load_unaligned_zeropad(data) &
	bytemask_from_count(left)));
	#else
	switch (left) {
	case 7: b \|= ((u64)end[6]) << 48; /* fall through */
	case 6: b \|= ((u64)end[5]) << 40; /* fall through */
	case 5: b \|= ((u64)end[4]) << 32; /* fall through */
	case 4: b \|= le32_to_cpup(data); break;
	case 3: b \|= ((u64)end[2]) << 16; /* fall through */
	case 2: b \|= le16_to_cpup(data); break;
	case 1: b \|= end[0];
	}
	#endif
	POSTAMBLE
	}
	EXPORT_SYMBOL(__siphash_aligned);

	#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
	u64 __siphash_unaligned(const void data, size_t len, const siphash_key_t key)
	{
	const u8 *end = data + len - (len % sizeof(u64));
	const u8 left = len & (sizeof(u64) - 1);
	u64 m;
	PREAMBLE(len)
	for (; data != end; data += sizeof(u64)) {
	m = get_unaligned_le64(data);
	v3 ^= m;
	SIPROUND;
	SIPROUND;
	v0 ^= m;
	}
	#if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64
	if (left)
	b \|= le64_to_cpu((__force __le64)(load_unaligned_zeropad(data) &
	bytemask_from_count(left)));
	#else
	switch (left) {
	case 7: b \|= ((u64)end[6]) << 48; /* fall through */
	case 6: b \|= ((u64)end[5]) << 40; /* fall through */
	case 5: b \|= ((u64)end[4]) << 32; /* fall through */
	case 4: b \|= get_unaligned_le32(end); break;
	case 3: b \|= ((u64)end[2]) << 16; /* fall through */
	case 2: b \|= get_unaligned_le16(end); break;
	case 1: b \|= end[0];
	}
	#endif
	POSTAMBLE
	}
	EXPORT_SYMBOL(__siphash_unaligned);
	#endif

	/**
	* siphash_1u64 - compute 64-bit siphash PRF value of a u64
	* @first: first u64
	* @key: the siphash key
	*/
	u64 siphash_1u64(const u64 first, const siphash_key_t *key)
	{
	PREAMBLE(8)
	v3 ^= first;
	SIPROUND;
	SIPROUND;
	v0 ^= first;
	POSTAMBLE
	}
	EXPORT_SYMBOL(siphash_1u64);

	/**
	* siphash_2u64 - compute 64-bit siphash PRF value of 2 u64
	* @first: first u64
	* @second: second u64
	* @key: the siphash key
	*/
	u64 siphash_2u64(const u64 first, const u64 second, const siphash_key_t *key)
	{
	PREAMBLE(16)
	v3 ^= first;
	SIPROUND;
	SIPROUND;
	v0 ^= first;
	v3 ^= second;
	SIPROUND;
	SIPROUND;
	v0 ^= second;
	POSTAMBLE
	}
	EXPORT_SYMBOL(siphash_2u64);

	/**
	* siphash_3u64 - compute 64-bit siphash PRF value of 3 u64
	* @first: first u64
	* @second: second u64
	* @third: third u64
	* @key: the siphash key
	*/
	u64 siphash_3u64(const u64 first, const u64 second, const u64 third,
	const siphash_key_t *key)
	{
	PREAMBLE(24)
	v3 ^= first;
	SIPROUND;
	SIPROUND;
	v0 ^= first;
	v3 ^= second;
	SIPROUND;
	SIPROUND;
	v0 ^= second;
	v3 ^= third;
	SIPROUND;
	SIPROUND;
	v0 ^= third;
	POSTAMBLE
	}
	EXPORT_SYMBOL(siphash_3u64);

	/**
	* siphash_4u64 - compute 64-bit siphash PRF value of 4 u64
	* @first: first u64
	* @second: second u64
	* @third: third u64
	* @forth: forth u64
	* @key: the siphash key
	*/
	u64 siphash_4u64(const u64 first, const u64 second, const u64 third,
	const u64 forth, const siphash_key_t *key)
	{
	PREAMBLE(32)
	v3 ^= first;
	SIPROUND;
	SIPROUND;
	v0 ^= first;
	v3 ^= second;
	SIPROUND;
	SIPROUND;
	v0 ^= second;
	v3 ^= third;
	SIPROUND;
	SIPROUND;
	v0 ^= third;
	v3 ^= forth;
	SIPROUND;
	SIPROUND;
	v0 ^= forth;
	POSTAMBLE
	}
	EXPORT_SYMBOL(siphash_4u64);

	u64 siphash_1u32(const u32 first, const siphash_key_t *key)
	{
	PREAMBLE(4)
	b \|= first;
	POSTAMBLE
	}
	EXPORT_SYMBOL(siphash_1u32);

	u64 siphash_3u32(const u32 first, const u32 second, const u32 third,
	const siphash_key_t *key)
	{
	u64 combined = (u64)second << 32 \| first;
	PREAMBLE(12)
	v3 ^= combined;
	SIPROUND;
	SIPROUND;
	v0 ^= combined;
	b \|= third;
	POSTAMBLE
	}
	EXPORT_SYMBOL(siphash_3u32);

	#if BITS_PER_LONG == 64
	/* Note that on 64-bit, we make HalfSipHash1-3 actually be SipHash1-3, for
	* performance reasons. On 32-bit, below, we actually implement HalfSipHash1-3.
	*/

	#define HSIPROUND SIPROUND
	#define HPREAMBLE(len) PREAMBLE(len)
	#define HPOSTAMBLE \
	v3 ^= b; \
	HSIPROUND; \
	v0 ^= b; \
	v2 ^= 0xff; \
	HSIPROUND; \
	HSIPROUND; \
	HSIPROUND; \
	return (v0 ^ v1) ^ (v2 ^ v3);

	u32 __hsiphash_aligned(const void data, size_t len, const hsiphash_key_t key)
	{
	const u8 *end = data + len - (len % sizeof(u64));
	const u8 left = len & (sizeof(u64) - 1);
	u64 m;
	HPREAMBLE(len)
	for (; data != end; data += sizeof(u64)) {
	m = le64_to_cpup(data);
	v3 ^= m;
	HSIPROUND;
	v0 ^= m;
	}
	#if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64
	if (left)
	b \|= le64_to_cpu((__force __le64)(load_unaligned_zeropad(data) &
	bytemask_from_count(left)));
	#else
	switch (left) {
	case 7: b \|= ((u64)end[6]) << 48; /* fall through */
	case 6: b \|= ((u64)end[5]) << 40; /* fall through */
	case 5: b \|= ((u64)end[4]) << 32; /* fall through */
	case 4: b \|= le32_to_cpup(data); break;
	case 3: b \|= ((u64)end[2]) << 16; /* fall through */
	case 2: b \|= le16_to_cpup(data); break;
	case 1: b \|= end[0];
	}
	#endif
	HPOSTAMBLE
	}
	EXPORT_SYMBOL(__hsiphash_aligned);

	#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
	u32 __hsiphash_unaligned(const void *data, size_t len,
	const hsiphash_key_t *key)
	{
	const u8 *end = data + len - (len % sizeof(u64));
	const u8 left = len & (sizeof(u64) - 1);
	u64 m;
	HPREAMBLE(len)
	for (; data != end; data += sizeof(u64)) {
	m = get_unaligned_le64(data);
	v3 ^= m;
	HSIPROUND;
	v0 ^= m;
	}
	#if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64
	if (left)
	b \|= le64_to_cpu((__force __le64)(load_unaligned_zeropad(data) &
	bytemask_from_count(left)));
	#else
	switch (left) {
	case 7: b \|= ((u64)end[6]) << 48; /* fall through */
	case 6: b \|= ((u64)end[5]) << 40; /* fall through */
	case 5: b \|= ((u64)end[4]) << 32; /* fall through */
	case 4: b \|= get_unaligned_le32(end); break;
	case 3: b \|= ((u64)end[2]) << 16; /* fall through */
	case 2: b \|= get_unaligned_le16(end); break;
	case 1: b \|= end[0];
	}
	#endif
	HPOSTAMBLE
	}
	EXPORT_SYMBOL(__hsiphash_unaligned);
	#endif

	/**
	* hsiphash_1u32 - compute 64-bit hsiphash PRF value of a u32
	* @first: first u32
	* @key: the hsiphash key
	*/
	u32 hsiphash_1u32(const u32 first, const hsiphash_key_t *key)
	{
	HPREAMBLE(4)
	b \|= first;
	HPOSTAMBLE
	}
	EXPORT_SYMBOL(hsiphash_1u32);

	/**
	* hsiphash_2u32 - compute 32-bit hsiphash PRF value of 2 u32
	* @first: first u32
	* @second: second u32
	* @key: the hsiphash key
	*/
	u32 hsiphash_2u32(const u32 first, const u32 second, const hsiphash_key_t *key)
	{
	u64 combined = (u64)second << 32 \| first;
	HPREAMBLE(8)
	v3 ^= combined;
	HSIPROUND;
	v0 ^= combined;
	HPOSTAMBLE
	}
	EXPORT_SYMBOL(hsiphash_2u32);

	/**
	* hsiphash_3u32 - compute 32-bit hsiphash PRF value of 3 u32
	* @first: first u32
	* @second: second u32
	* @third: third u32
	* @key: the hsiphash key
	*/
	u32 hsiphash_3u32(const u32 first, const u32 second, const u32 third,
	const hsiphash_key_t *key)
	{
	u64 combined = (u64)second << 32 \| first;
	HPREAMBLE(12)
	v3 ^= combined;
	HSIPROUND;
	v0 ^= combined;
	b \|= third;
	HPOSTAMBLE
	}
	EXPORT_SYMBOL(hsiphash_3u32);

	/**
	* hsiphash_4u32 - compute 32-bit hsiphash PRF value of 4 u32
	* @first: first u32
	* @second: second u32
	* @third: third u32
	* @forth: forth u32
	* @key: the hsiphash key
	*/
	u32 hsiphash_4u32(const u32 first, const u32 second, const u32 third,
	const u32 forth, const hsiphash_key_t *key)
	{
	u64 combined = (u64)second << 32 \| first;
	HPREAMBLE(16)
	v3 ^= combined;
	HSIPROUND;
	v0 ^= combined;
	combined = (u64)forth << 32 \| third;
	v3 ^= combined;
	HSIPROUND;
	v0 ^= combined;
	HPOSTAMBLE
	}
	EXPORT_SYMBOL(hsiphash_4u32);
	#else
	#define HSIPROUND \
	do { \
	v0 += v1; v1 = rol32(v1, 5); v1 ^= v0; v0 = rol32(v0, 16); \
	v2 += v3; v3 = rol32(v3, 8); v3 ^= v2; \
	v0 += v3; v3 = rol32(v3, 7); v3 ^= v0; \
	v2 += v1; v1 = rol32(v1, 13); v1 ^= v2; v2 = rol32(v2, 16); \
	} while (0)

	#define HPREAMBLE(len) \
	u32 v0 = 0; \
	u32 v1 = 0; \
	u32 v2 = 0x6c796765U; \
	u32 v3 = 0x74656462U; \
	u32 b = ((u32)(len)) << 24; \
	v3 ^= key->key[1]; \
	v2 ^= key->key[0]; \
	v1 ^= key->key[1]; \
	v0 ^= key->key[0];

	#define HPOSTAMBLE \
	v3 ^= b; \
	HSIPROUND; \
	v0 ^= b; \
	v2 ^= 0xff; \
	HSIPROUND; \
	HSIPROUND; \
	HSIPROUND; \
	return v1 ^ v3;

	u32 __hsiphash_aligned(const void data, size_t len, const hsiphash_key_t key)
	{
	const u8 *end = data + len - (len % sizeof(u32));
	const u8 left = len & (sizeof(u32) - 1);
	u32 m;
	HPREAMBLE(len)
	for (; data != end; data += sizeof(u32)) {
	m = le32_to_cpup(data);
	v3 ^= m;
	HSIPROUND;
	v0 ^= m;
	}
	switch (left) {
	case 3: b \|= ((u32)end[2]) << 16; /* fall through */
	case 2: b \|= le16_to_cpup(data); break;
	case 1: b \|= end[0];
	}
	HPOSTAMBLE
	}
	EXPORT_SYMBOL(__hsiphash_aligned);

	#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
	u32 __hsiphash_unaligned(const void *data, size_t len,
	const hsiphash_key_t *key)
	{
	const u8 *end = data + len - (len % sizeof(u32));
	const u8 left = len & (sizeof(u32) - 1);
	u32 m;
	HPREAMBLE(len)
	for (; data != end; data += sizeof(u32)) {
	m = get_unaligned_le32(data);
	v3 ^= m;
	HSIPROUND;
	v0 ^= m;
	}
	switch (left) {
	case 3: b \|= ((u32)end[2]) << 16; /* fall through */
	case 2: b \|= get_unaligned_le16(end); break;
	case 1: b \|= end[0];
	}
	HPOSTAMBLE
	}
	EXPORT_SYMBOL(__hsiphash_unaligned);
	#endif

	/**
	* hsiphash_1u32 - compute 32-bit hsiphash PRF value of a u32
	* @first: first u32
	* @key: the hsiphash key
	*/
	u32 hsiphash_1u32(const u32 first, const hsiphash_key_t *key)
	{
	HPREAMBLE(4)
	v3 ^= first;
	HSIPROUND;
	v0 ^= first;
	HPOSTAMBLE
	}
	EXPORT_SYMBOL(hsiphash_1u32);

	/**
	* hsiphash_2u32 - compute 32-bit hsiphash PRF value of 2 u32
	* @first: first u32
	* @second: second u32
	* @key: the hsiphash key
	*/
	u32 hsiphash_2u32(const u32 first, const u32 second, const hsiphash_key_t *key)
	{
	HPREAMBLE(8)
	v3 ^= first;
	HSIPROUND;
	v0 ^= first;
	v3 ^= second;
	HSIPROUND;
	v0 ^= second;
	HPOSTAMBLE
	}
	EXPORT_SYMBOL(hsiphash_2u32);

	/**
	* hsiphash_3u32 - compute 32-bit hsiphash PRF value of 3 u32
	* @first: first u32
	* @second: second u32
	* @third: third u32
	* @key: the hsiphash key
	*/
	u32 hsiphash_3u32(const u32 first, const u32 second, const u32 third,
	const hsiphash_key_t *key)
	{
	HPREAMBLE(12)
	v3 ^= first;
	HSIPROUND;
	v0 ^= first;
	v3 ^= second;
	HSIPROUND;
	v0 ^= second;
	v3 ^= third;
	HSIPROUND;
	v0 ^= third;
	HPOSTAMBLE
	}
	EXPORT_SYMBOL(hsiphash_3u32);

	/**
	* hsiphash_4u32 - compute 32-bit hsiphash PRF value of 4 u32
	* @first: first u32
	* @second: second u32
	* @third: third u32
	* @forth: forth u32
	* @key: the hsiphash key
	*/
	u32 hsiphash_4u32(const u32 first, const u32 second, const u32 third,
	const u32 forth, const hsiphash_key_t *key)
	{
	HPREAMBLE(16)
	v3 ^= first;
	HSIPROUND;
	v0 ^= first;
	v3 ^= second;
	HSIPROUND;
	v0 ^= second;
	v3 ^= third;
	HSIPROUND;
	v0 ^= third;
	v3 ^= forth;
	HSIPROUND;
	v0 ^= forth;
	HPOSTAMBLE
	}
	EXPORT_SYMBOL(hsiphash_4u32);
	#endif