ceae8422c1
Move a bunch of code from siphash.c to siphash.h, making it available to other modules. This will allow places which need hashes of more complex objects to construct them incrementally. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
124 lines
3.6 KiB
C
124 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright Red Hat
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* Author: Stefano Brivio <sbrivio@redhat.com>
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* Author: David Gibson <david@gibson.dropbear.id.au>
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*
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* This is an implementation of the SipHash-2-4-64 functions needed for TCP
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* initial sequence numbers and socket lookup table hash for IPv4 and IPv6, see:
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*
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* Aumasson, J.P. and Bernstein, D.J., 2012, December. SipHash: a fast
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* short-input PRF. In International Conference on Cryptology in India
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* (pp. 489-508). Springer, Berlin, Heidelberg.
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*
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* http://cr.yp.to/siphash/siphash-20120918.pdf
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*
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* This includes code from the reference SipHash implementation at
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* https://github.com/veorq/SipHash/ originally licensed as follows:
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*
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* --
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* SipHash reference C implementation
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*
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* Copyright (c) 2012-2021 Jean-Philippe Aumasson <jeanphilippe.aumasson@gmail.com>
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* Copyright (c) 2012-2014 Daniel J. Bernstein <djb@cr.yp.to>
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*
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* To the extent possible under law, the author(s) have dedicated all copyright
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* and related and neighboring rights to this software to the public domain
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* worldwide. This software is distributed without any warranty.
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*
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* You should have received a copy of the CC0 Public Domain Dedication along
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* with this software. If not, see
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* <http://creativecommons.org/publicdomain/zero/1.0/>.
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* --
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*
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* and from the Linux kernel implementation (lib/siphash.c), originally licensed
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* as follows:
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*
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* --
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* Copyright (C) 2016 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*
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* This file is provided under a dual BSD/GPLv2 license.
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* --
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*
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*/
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#ifndef SIPHASH_H
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#define SIPHASH_H
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/**
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* struct siphash_state - Internal state of siphash calculation
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*/
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struct siphash_state {
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uint64_t v[4];
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};
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#define SIPHASH_INIT(k) { { \
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0x736f6d6570736575ULL ^ (k)[0], \
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0x646f72616e646f6dULL ^ (k)[1], \
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0x6c7967656e657261ULL ^ (k)[0], \
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0x7465646279746573ULL ^ (k)[1] \
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} }
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/**
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* sipround() - Perform rounds of SipHash scrambling
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* @v: siphash state (4 x 64-bit integers)
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* @n: Number of rounds to apply
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*/
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static inline void sipround(struct siphash_state *state, int n)
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{
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int i;
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#define ROTL(x, b) (uint64_t)(((x) << (b)) | ((x) >> (64 - (b))))
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for (i = 0; i < n; i++) {
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state->v[0] += state->v[1];
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state->v[1] = ROTL(state->v[1], 13) ^ state->v[0];
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state->v[0] = ROTL(state->v[0], 32);
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state->v[2] += state->v[3];
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state->v[3] = ROTL(state->v[3], 16) ^ state->v[2];
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state->v[0] += state->v[3];
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state->v[3] = ROTL(state->v[3], 21) ^ state->v[0];
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state->v[2] += state->v[1];
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state->v[1] = ROTL(state->v[1], 17) ^ state->v[2];
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state->v[2] = ROTL(state->v[2], 32);
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}
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#undef ROTL
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}
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/**
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* siphash_feed() - Fold 64-bits of data into the hash state
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* @v: siphash state (4 x 64-bit integers)
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* @in: New value to fold into hash
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*/
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static inline void siphash_feed(struct siphash_state *state, uint64_t in)
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{
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state->v[3] ^= in;
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sipround(state, 2);
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state->v[0] ^= in;
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}
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/**
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* siphash_final - Finalize SipHash calculations
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* @v: siphash state (4 x 64-bit integers)
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* @len: Total length of input data
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* @tail: Final data for the hash (<= 7 bytes)
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*/
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static inline uint64_t siphash_final(struct siphash_state *state,
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size_t len, uint64_t tail)
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{
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uint64_t b = (uint64_t)(len) << 56 | tail;
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siphash_feed(state, b);
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state->v[2] ^= 0xff;
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sipround(state, 4);
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return state->v[0] ^ state->v[1] ^ state->v[2] ^ state->v[3];
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}
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uint64_t siphash_8b(const uint8_t *in, const uint64_t *k);
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uint64_t siphash_12b(const uint8_t *in, const uint64_t *k);
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uint64_t siphash_20b(const uint8_t *in, const uint64_t *k);
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uint64_t siphash_32b(const uint8_t *in, const uint64_t *k);
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uint64_t siphash_36b(const uint8_t *in, const uint64_t *k);
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#endif /* SIPHASH_H */
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