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/* * SipHash reference C implementation * * Copyright (c) 2016 Jean-Philippe Aumasson <[email protected]> * * 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/>. */ /* * Originally taken from https://github.com/veorq/SipHash/ * Altered to match V8's use case. */ #include "src/third_party/siphash/halfsiphash.h" #include "src/base/logging.h" #include "src/base/v8-fallthrough.h" #define ROTL(x, b) (uint32_t)(((x) << (b)) | ((x) >> (32 - (b)))) #define SIPROUND \ do { \ v0 += v1; \ v1 = ROTL(v1, 5); \ v1 ^= v0; \ v0 = ROTL(v0, 16); \ v2 += v3; \ v3 = ROTL(v3, 8); \ v3 ^= v2; \ v0 += v3; \ v3 = ROTL(v3, 7); \ v3 ^= v0; \ v2 += v1; \ v1 = ROTL(v1, 13); \ v1 ^= v2; \ v2 = ROTL(v2, 16); \ } while (0) // Simplified half-siphash-2-4 implementation for 4 byte input. uint32_t halfsiphash(const uint32_t value, const uint64_t seed) { uint32_t v0 = 0; uint32_t v1 = 0; uint32_t v2 = 0x6c796765; uint32_t v3 = 0x74656462; uint32_t k[2]; memcpy(k, &seed, sizeof(seed)); uint32_t b = 4 << 24; v3 ^= k[1]; v2 ^= k[0]; v1 ^= k[1]; v0 ^= k[0]; v3 ^= value; // 2 c-rounds SIPROUND; SIPROUND; v0 ^= value; v3 ^= b; // 2 c-rounds SIPROUND; SIPROUND; v0 ^= b; v2 ^= 0xff; // 4 d-rounds SIPROUND; SIPROUND; SIPROUND; SIPROUND; b = v1 ^ v3; return b; }