8c0dfd7188
Systemd instroduces a macro _fallthrough_, see https://github.com/systemd/systemd/pull/7389. However, it does not yet seem conclusive how to handle this properly in ever situation. While shared/nm-utils/siphash24.c makes use of the new macro, don't do that in our fork. siphash24.h does not include all systemd headers, hence _fallthrough_ is not defined. We could re-implement it as _nm_fallthrough, but given the open questions, that doesn't seem the
205 lines
7.2 KiB
C
205 lines
7.2 KiB
C
/*
|
|
SipHash reference C implementation
|
|
|
|
Written in 2012 by
|
|
Jean-Philippe Aumasson <jeanphilippe.aumasson@gmail.com>
|
|
Daniel J. Bernstein <djb@cr.yp.to>
|
|
|
|
To the extent possible under law, the author(s) have dedicated all copyright
|
|
and related and neighboring rights to this software to the public domain
|
|
worldwide. This software is distributed without any warranty.
|
|
|
|
You should have received a copy of the CC0 Public Domain Dedication along with
|
|
this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
|
|
|
|
(Minimal changes made by Lennart Poettering, to make clean for inclusion in systemd)
|
|
(Refactored by Tom Gundersen to split up in several functions and follow systemd
|
|
coding style)
|
|
*/
|
|
|
|
#include "nm-default.h"
|
|
|
|
#define assert(cond) nm_assert (cond)
|
|
#define _fallthrough_ _nm_fallthrough
|
|
|
|
#include <stdio.h>
|
|
|
|
#include "siphash24.h"
|
|
#include "unaligned.h"
|
|
|
|
static inline uint64_t rotate_left(uint64_t x, uint8_t b) {
|
|
assert(b < 64);
|
|
|
|
return (x << b) | (x >> (64 - b));
|
|
}
|
|
|
|
static inline void sipround(struct siphash *state) {
|
|
assert(state);
|
|
|
|
state->v0 += state->v1;
|
|
state->v1 = rotate_left(state->v1, 13);
|
|
state->v1 ^= state->v0;
|
|
state->v0 = rotate_left(state->v0, 32);
|
|
state->v2 += state->v3;
|
|
state->v3 = rotate_left(state->v3, 16);
|
|
state->v3 ^= state->v2;
|
|
state->v0 += state->v3;
|
|
state->v3 = rotate_left(state->v3, 21);
|
|
state->v3 ^= state->v0;
|
|
state->v2 += state->v1;
|
|
state->v1 = rotate_left(state->v1, 17);
|
|
state->v1 ^= state->v2;
|
|
state->v2 = rotate_left(state->v2, 32);
|
|
}
|
|
|
|
void siphash24_init(struct siphash *state, const uint8_t k[16]) {
|
|
uint64_t k0, k1;
|
|
|
|
assert(state);
|
|
assert(k);
|
|
|
|
k0 = unaligned_read_le64(k);
|
|
k1 = unaligned_read_le64(k + 8);
|
|
|
|
*state = (struct siphash) {
|
|
/* "somepseudorandomlygeneratedbytes" */
|
|
.v0 = 0x736f6d6570736575ULL ^ k0,
|
|
.v1 = 0x646f72616e646f6dULL ^ k1,
|
|
.v2 = 0x6c7967656e657261ULL ^ k0,
|
|
.v3 = 0x7465646279746573ULL ^ k1,
|
|
.padding = 0,
|
|
.inlen = 0,
|
|
};
|
|
}
|
|
|
|
void siphash24_compress(const void *_in, size_t inlen, struct siphash *state) {
|
|
|
|
const uint8_t *in = _in;
|
|
const uint8_t *end = in + inlen;
|
|
size_t left = state->inlen & 7;
|
|
uint64_t m;
|
|
|
|
assert(in);
|
|
assert(state);
|
|
|
|
/* Update total length */
|
|
state->inlen += inlen;
|
|
|
|
/* If padding exists, fill it out */
|
|
if (left > 0) {
|
|
for ( ; in < end && left < 8; in ++, left ++)
|
|
state->padding |= ((uint64_t) *in) << (left * 8);
|
|
|
|
if (in == end && left < 8)
|
|
/* We did not have enough input to fill out the padding completely */
|
|
return;
|
|
|
|
#ifdef DEBUG
|
|
printf("(%3zu) v0 %08x %08x\n", state->inlen, (uint32_t) (state->v0 >> 32), (uint32_t) state->v0);
|
|
printf("(%3zu) v1 %08x %08x\n", state->inlen, (uint32_t) (state->v1 >> 32), (uint32_t) state->v1);
|
|
printf("(%3zu) v2 %08x %08x\n", state->inlen, (uint32_t) (state->v2 >> 32), (uint32_t) state->v2);
|
|
printf("(%3zu) v3 %08x %08x\n", state->inlen, (uint32_t) (state->v3 >> 32), (uint32_t) state->v3);
|
|
printf("(%3zu) compress padding %08x %08x\n", state->inlen, (uint32_t) (state->padding >> 32), (uint32_t)state->padding);
|
|
#endif
|
|
|
|
state->v3 ^= state->padding;
|
|
sipround(state);
|
|
sipround(state);
|
|
state->v0 ^= state->padding;
|
|
|
|
state->padding = 0;
|
|
}
|
|
|
|
end -= (state->inlen % sizeof(uint64_t));
|
|
|
|
for ( ; in < end; in += 8) {
|
|
m = unaligned_read_le64(in);
|
|
#ifdef DEBUG
|
|
printf("(%3zu) v0 %08x %08x\n", state->inlen, (uint32_t) (state->v0 >> 32), (uint32_t) state->v0);
|
|
printf("(%3zu) v1 %08x %08x\n", state->inlen, (uint32_t) (state->v1 >> 32), (uint32_t) state->v1);
|
|
printf("(%3zu) v2 %08x %08x\n", state->inlen, (uint32_t) (state->v2 >> 32), (uint32_t) state->v2);
|
|
printf("(%3zu) v3 %08x %08x\n", state->inlen, (uint32_t) (state->v3 >> 32), (uint32_t) state->v3);
|
|
printf("(%3zu) compress %08x %08x\n", state->inlen, (uint32_t) (m >> 32), (uint32_t) m);
|
|
#endif
|
|
state->v3 ^= m;
|
|
sipround(state);
|
|
sipround(state);
|
|
state->v0 ^= m;
|
|
}
|
|
|
|
left = state->inlen & 7;
|
|
switch (left) {
|
|
case 7:
|
|
state->padding |= ((uint64_t) in[6]) << 48;
|
|
_fallthrough_;
|
|
case 6:
|
|
state->padding |= ((uint64_t) in[5]) << 40;
|
|
_fallthrough_;
|
|
case 5:
|
|
state->padding |= ((uint64_t) in[4]) << 32;
|
|
_fallthrough_;
|
|
case 4:
|
|
state->padding |= ((uint64_t) in[3]) << 24;
|
|
_fallthrough_;
|
|
case 3:
|
|
state->padding |= ((uint64_t) in[2]) << 16;
|
|
_fallthrough_;
|
|
case 2:
|
|
state->padding |= ((uint64_t) in[1]) << 8;
|
|
_fallthrough_;
|
|
case 1:
|
|
state->padding |= ((uint64_t) in[0]);
|
|
_fallthrough_;
|
|
case 0:
|
|
break;
|
|
}
|
|
}
|
|
|
|
uint64_t siphash24_finalize(struct siphash *state) {
|
|
uint64_t b;
|
|
|
|
assert(state);
|
|
|
|
b = state->padding | (((uint64_t) state->inlen) << 56);
|
|
|
|
#ifdef DEBUG
|
|
printf("(%3zu) v0 %08x %08x\n", state->inlen, (uint32_t) (state->v0 >> 32), (uint32_t) state->v0);
|
|
printf("(%3zu) v1 %08x %08x\n", state->inlen, (uint32_t) (state->v1 >> 32), (uint32_t) state->v1);
|
|
printf("(%3zu) v2 %08x %08x\n", state->inlen, (uint32_t) (state->v2 >> 32), (uint32_t) state->v2);
|
|
printf("(%3zu) v3 %08x %08x\n", state->inlen, (uint32_t) (state->v3 >> 32), (uint32_t) state->v3);
|
|
printf("(%3zu) padding %08x %08x\n", state->inlen, (uint32_t) (state->padding >> 32), (uint32_t) state->padding);
|
|
#endif
|
|
|
|
state->v3 ^= b;
|
|
sipround(state);
|
|
sipround(state);
|
|
state->v0 ^= b;
|
|
|
|
#ifdef DEBUG
|
|
printf("(%3zu) v0 %08x %08x\n", state->inlen, (uint32_t) (state->v0 >> 32), (uint32_t) state->v0);
|
|
printf("(%3zu) v1 %08x %08x\n", state->inlen, (uint32_t) (state->v1 >> 32), (uint32_t) state->v1);
|
|
printf("(%3zu) v2 %08x %08x\n", state->inlen, (uint32_t) (state->v2 >> 32), (uint32_t) state->v2);
|
|
printf("(%3zu) v3 %08x %08x\n", state->inlen, (uint32_t) (state->v3 >> 32), (uint32_t) state->v3);
|
|
#endif
|
|
state->v2 ^= 0xff;
|
|
|
|
sipround(state);
|
|
sipround(state);
|
|
sipround(state);
|
|
sipround(state);
|
|
|
|
return state->v0 ^ state->v1 ^ state->v2 ^ state->v3;
|
|
}
|
|
|
|
uint64_t siphash24(const void *in, size_t inlen, const uint8_t k[16]) {
|
|
struct siphash state;
|
|
|
|
assert(in);
|
|
assert(k);
|
|
|
|
siphash24_init(&state, k);
|
|
siphash24_compress(in, inlen, &state);
|
|
|
|
return siphash24_finalize(&state);
|
|
}
|