diff options
Diffstat (limited to 'siphash.c')
| -rw-r--r-- | siphash.c | 104 |
1 files changed, 0 insertions, 104 deletions
@@ -10,45 +10,6 @@ * * Copyright (c) 2020-2021 Red Hat GmbH * Author: Stefano Brivio <sbrivio@redhat.com> - * - * 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. - * -- - * */ #include <stddef.h> @@ -56,71 +17,6 @@ #include "siphash.h" -#define ROTL(x, b) (uint64_t)(((x) << (b)) | ((x) >> (64 - (b)))) - -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; - - 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); - } -} - -/** - * 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]; -} - /** * siphash_8b() - Table index or timestamp offset for TCP over IPv4 (8 bytes in) * @in: Input data (remote address and two ports, or two addresses) |