552 lines
12 KiB
C
552 lines
12 KiB
C
/* 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
|