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/* Copyright 2015-2016 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. */
#include "siphash24.h"
#include <linux/kernel.h>
#define ROTL(x,b) (uint64_t)(((x) << (b)) | ((x) >> (64 - (b))))
#define U8TO64(p) le64_to_cpu(*(__le64 *)(p))
#define SIPROUND \
do { \
v0 += v1; v1 = ROTL(v1, 13); v1 ^= v0; v0 = ROTL(v0, 32); \
v2 += v3; v3 = ROTL(v3, 16); v3 ^= v2; \
v0 += v3; v3 = ROTL(v3, 21); v3 ^= v0; \
v2 += v1; v1 = ROTL(v1, 17); v1 ^= v2; v2 = ROTL(v2, 32); \
} while(0)
__attribute__((optimize("unroll-loops")))
uint64_t siphash24(const uint8_t *data, size_t len, const uint8_t key[static SIPHASH24_KEY_LEN])
{
uint64_t v0 = 0x736f6d6570736575ULL;
uint64_t v1 = 0x646f72616e646f6dULL;
uint64_t v2 = 0x6c7967656e657261ULL;
uint64_t v3 = 0x7465646279746573ULL;
uint64_t b;
uint64_t k0 = U8TO64(key);
uint64_t k1 = U8TO64(key + sizeof(uint64_t));
uint64_t m;
const uint8_t *end = data + len - (len % sizeof(uint64_t));
const uint8_t left = len & (sizeof(uint64_t) - 1);
b = ((uint64_t)len) << 56;
v3 ^= k1;
v2 ^= k0;
v1 ^= k1;
v0 ^= k0;
for (; data != end; data += sizeof(uint64_t)) {
m = U8TO64(data);
v3 ^= m;
SIPROUND;
SIPROUND;
v0 ^= m;
}
switch (left) {
case 7: b |= ((uint64_t)data[6]) << 48;
case 6: b |= ((uint64_t)data[5]) << 40;
case 5: b |= ((uint64_t)data[4]) << 32;
case 4: b |= ((uint64_t)data[3]) << 24;
case 3: b |= ((uint64_t)data[2]) << 16;
case 2: b |= ((uint64_t)data[1]) << 8;
case 1: b |= ((uint64_t)data[0]); break;
case 0: break;
}
v3 ^= b;
SIPROUND;
SIPROUND;
v0 ^= b;
v2 ^= 0xff;
SIPROUND;
SIPROUND;
SIPROUND;
SIPROUND;
b = (v0 ^ v1) ^ (v2 ^ v3);
return (__force uint64_t)cpu_to_le64(b);
}
#include "../selftest/siphash24.h"
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