mirror of https://passt.top/passt
125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
|
|
* Copyright Red Hat
|
|
* Author: Stefano Brivio <sbrivio@redhat.com>
|
|
* Author: David Gibson <david@gibson.dropbear.id.au>
|
|
*
|
|
* This is an implementation of the SipHash-2-4-64 functions needed for TCP
|
|
* initial sequence numbers and socket lookup table hash for IPv4 and IPv6, see:
|
|
*
|
|
* Aumasson, J.P. and Bernstein, D.J., 2012, December. SipHash: a fast
|
|
* short-input PRF. In International Conference on Cryptology in India
|
|
* (pp. 489-508). Springer, Berlin, Heidelberg.
|
|
*
|
|
* http://cr.yp.to/siphash/siphash-20120918.pdf
|
|
*
|
|
* This includes code from the reference SipHash implementation at
|
|
* https://github.com/veorq/SipHash/ originally licensed as follows:
|
|
*
|
|
* --
|
|
* SipHash reference C implementation
|
|
*
|
|
* Copyright (c) 2012-2021 Jean-Philippe Aumasson <jeanphilippe.aumasson@gmail.com>
|
|
* Copyright (c) 2012-2014 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/>.
|
|
* --
|
|
*
|
|
* and from the Linux kernel implementation (lib/siphash.c), originally licensed
|
|
* as follows:
|
|
*
|
|
* --
|
|
* Copyright (C) 2016 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
|
|
*
|
|
* This file is provided under a dual BSD/GPLv2 license.
|
|
* --
|
|
*
|
|
*/
|
|
|
|
#ifndef SIPHASH_H
|
|
#define SIPHASH_H
|
|
|
|
/**
|
|
* struct siphash_state - Internal state of siphash calculation
|
|
*/
|
|
struct siphash_state {
|
|
uint64_t v[4];
|
|
};
|
|
|
|
#define SIPHASH_INIT(k) { { \
|
|
0x736f6d6570736575ULL ^ (k)[0], \
|
|
0x646f72616e646f6dULL ^ (k)[1], \
|
|
0x6c7967656e657261ULL ^ (k)[0], \
|
|
0x7465646279746573ULL ^ (k)[1] \
|
|
} }
|
|
|
|
/**
|
|
* sipround() - Perform rounds of SipHash scrambling
|
|
* @v: siphash state (4 x 64-bit integers)
|
|
* @n: Number of rounds to apply
|
|
*/
|
|
static inline void sipround(struct siphash_state *state, int n)
|
|
{
|
|
int i;
|
|
|
|
#define ROTL(x, b) (uint64_t)(((x) << (b)) | ((x) >> (64 - (b))))
|
|
|
|
for (i = 0; i < n; i++) {
|
|
|
|
state->v[0] += state->v[1];
|
|
state->v[1] = ROTL(state->v[1], 13) ^ state->v[0];
|
|
state->v[0] = ROTL(state->v[0], 32);
|
|
state->v[2] += state->v[3];
|
|
state->v[3] = ROTL(state->v[3], 16) ^ state->v[2];
|
|
state->v[0] += state->v[3];
|
|
state->v[3] = ROTL(state->v[3], 21) ^ state->v[0];
|
|
state->v[2] += state->v[1];
|
|
state->v[1] = ROTL(state->v[1], 17) ^ state->v[2];
|
|
state->v[2] = ROTL(state->v[2], 32);
|
|
}
|
|
|
|
#undef ROTL
|
|
}
|
|
|
|
/**
|
|
* siphash_feed() - Fold 64-bits of data into the hash state
|
|
* @v: siphash state (4 x 64-bit integers)
|
|
* @in: New value to fold into hash
|
|
*/
|
|
static inline void siphash_feed(struct siphash_state *state, uint64_t in)
|
|
{
|
|
state->v[3] ^= in;
|
|
sipround(state, 2);
|
|
state->v[0] ^= in;
|
|
}
|
|
|
|
/**
|
|
* siphash_final - Finalize SipHash calculations
|
|
* @v: siphash state (4 x 64-bit integers)
|
|
* @len: Total length of input data
|
|
* @tail: Final data for the hash (<= 7 bytes)
|
|
*/
|
|
static inline uint64_t siphash_final(struct siphash_state *state,
|
|
size_t len, uint64_t tail)
|
|
{
|
|
uint64_t b = (uint64_t)(len) << 56 | tail;
|
|
|
|
siphash_feed(state, b);
|
|
state->v[2] ^= 0xff;
|
|
sipround(state, 4);
|
|
return state->v[0] ^ state->v[1] ^ state->v[2] ^ state->v[3];
|
|
}
|
|
|
|
uint64_t siphash_8b(const uint8_t *in, const uint64_t *k);
|
|
uint64_t siphash_12b(const uint8_t *in, const uint64_t *k);
|
|
uint64_t siphash_20b(const uint8_t *in, const uint64_t *k);
|
|
uint64_t siphash_32b(const uint8_t *in, const uint64_t *k);
|
|
uint64_t siphash_36b(const uint8_t *in, const uint64_t *k);
|
|
|
|
#endif /* SIPHASH_H */
|