/* $NetBSD: siphash.c,v 1.1.2.2 2024/02/24 13:07:21 martin Exp $ */ /* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * SPDX-License-Identifier: MPL-2.0 * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #include #include #include #include #include #include /* * The implementation is based on SipHash reference C implementation by * * Copyright (c) 2012-2016 Jean-Philippe Aumasson * Copyright (c) 2012-2014 Daniel J. Bernstein * * * 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 . */ #define cROUNDS 2 #define dROUNDS 4 #define ROTATE64(x, b) (uint64_t)(((x) << (b)) | ((x) >> (64 - (b)))) #define HALF_ROUND64(a, b, c, d, s, t) \ a += b; \ c += d; \ b = ROTATE64(b, s) ^ a; \ d = ROTATE64(d, t) ^ c; \ a = ROTATE64(a, 32); #define FULL_ROUND64(v0, v1, v2, v3) \ HALF_ROUND64(v0, v1, v2, v3, 13, 16); \ HALF_ROUND64(v2, v1, v0, v3, 17, 21); #define SIPROUND FULL_ROUND64 #define ROTATE32(x, b) (uint32_t)(((x) << (b)) | ((x) >> (32 - (b)))) #define HALF_ROUND32(a, b, c, d, s, t) \ a += b; \ c += d; \ b = ROTATE32(b, s) ^ a; \ d = ROTATE32(d, t) ^ c; \ a = ROTATE32(a, 16); #define FULL_ROUND32(v0, v1, v2, v3) \ HALF_ROUND32(v0, v1, v2, v3, 5, 8); \ HALF_ROUND32(v2, v1, v0, v3, 13, 7); #define HALFSIPROUND FULL_ROUND32 #define U32TO8_LE(p, v) \ (p)[0] = (uint8_t)((v)); \ (p)[1] = (uint8_t)((v) >> 8); \ (p)[2] = (uint8_t)((v) >> 16); \ (p)[3] = (uint8_t)((v) >> 24); #define U8TO32_LE(p) \ (((uint32_t)((p)[0])) | ((uint32_t)((p)[1]) << 8) | \ ((uint32_t)((p)[2]) << 16) | ((uint32_t)((p)[3]) << 24)) #define U64TO8_LE(p, v) \ U32TO8_LE((p), (uint32_t)((v))); \ U32TO8_LE((p) + 4, (uint32_t)((v) >> 32)); #define U8TO64_LE(p) \ (((uint64_t)((p)[0])) | ((uint64_t)((p)[1]) << 8) | \ ((uint64_t)((p)[2]) << 16) | ((uint64_t)((p)[3]) << 24) | \ ((uint64_t)((p)[4]) << 32) | ((uint64_t)((p)[5]) << 40) | \ ((uint64_t)((p)[6]) << 48) | ((uint64_t)((p)[7]) << 56)) void isc_siphash24(const uint8_t *k, const uint8_t *in, const size_t inlen, uint8_t *out) { REQUIRE(k != NULL); REQUIRE(out != NULL); REQUIRE(inlen == 0 || in != NULL); uint64_t k0; uint64_t k1; memcpy(&k0, k, sizeof(k0)); memcpy(&k1, k + sizeof(k0), sizeof(k1)); k0 = le64toh(k0); k1 = le64toh(k1); uint64_t v0 = UINT64_C(0x736f6d6570736575) ^ k0; uint64_t v1 = UINT64_C(0x646f72616e646f6d) ^ k1; uint64_t v2 = UINT64_C(0x6c7967656e657261) ^ k0; uint64_t v3 = UINT64_C(0x7465646279746573) ^ k1; uint64_t b = ((uint64_t)inlen) << 56; const uint8_t *end = (in == NULL) ? NULL : in + inlen - (inlen % sizeof(uint64_t)); const size_t left = inlen & 7; for (; in != end; in += 8) { uint64_t m = U8TO64_LE(in); v3 ^= m; for (size_t i = 0; i < cROUNDS; ++i) { SIPROUND(v0, v1, v2, v3); } v0 ^= m; } switch (left) { case 7: b |= ((uint64_t)in[6]) << 48; FALLTHROUGH; case 6: b |= ((uint64_t)in[5]) << 40; FALLTHROUGH; case 5: b |= ((uint64_t)in[4]) << 32; FALLTHROUGH; case 4: b |= ((uint64_t)in[3]) << 24; FALLTHROUGH; case 3: b |= ((uint64_t)in[2]) << 16; FALLTHROUGH; case 2: b |= ((uint64_t)in[1]) << 8; FALLTHROUGH; case 1: b |= ((uint64_t)in[0]); FALLTHROUGH; case 0: break; default: UNREACHABLE(); } v3 ^= b; for (size_t i = 0; i < cROUNDS; ++i) { SIPROUND(v0, v1, v2, v3); } v0 ^= b; v2 ^= 0xff; for (size_t i = 0; i < dROUNDS; ++i) { SIPROUND(v0, v1, v2, v3); } b = v0 ^ v1 ^ v2 ^ v3; U64TO8_LE(out, b); } void isc_halfsiphash24(const uint8_t *k, const uint8_t *in, const size_t inlen, uint8_t *out) { REQUIRE(k != NULL); REQUIRE(out != NULL); REQUIRE(inlen == 0 || in != NULL); uint32_t k0 = U8TO32_LE(k); uint32_t k1 = U8TO32_LE(k + 4); uint32_t v0 = UINT32_C(0x00000000) ^ k0; uint32_t v1 = UINT32_C(0x00000000) ^ k1; uint32_t v2 = UINT32_C(0x6c796765) ^ k0; uint32_t v3 = UINT32_C(0x74656462) ^ k1; uint32_t b = ((uint32_t)inlen) << 24; const uint8_t *end = (in == NULL) ? NULL : in + inlen - (inlen % sizeof(uint32_t)); const int left = inlen & 3; for (; in != end; in += 4) { uint32_t m = U8TO32_LE(in); v3 ^= m; for (size_t i = 0; i < cROUNDS; ++i) { HALFSIPROUND(v0, v1, v2, v3); } v0 ^= m; } switch (left) { case 3: b |= ((uint32_t)in[2]) << 16; FALLTHROUGH; case 2: b |= ((uint32_t)in[1]) << 8; FALLTHROUGH; case 1: b |= ((uint32_t)in[0]); FALLTHROUGH; case 0: break; default: UNREACHABLE(); } v3 ^= b; for (size_t i = 0; i < cROUNDS; ++i) { HALFSIPROUND(v0, v1, v2, v3); } v0 ^= b; v2 ^= 0xff; for (size_t i = 0; i < dROUNDS; ++i) { HALFSIPROUND(v0, v1, v2, v3); } b = v1 ^ v3; U32TO8_LE(out, b); }