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309 lines
8.2 KiB
C++
309 lines
8.2 KiB
C++
#pragma once
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/** SipHash is a fast cryptographic hash function for short strings.
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* Taken from here: https://www.131002.net/siphash/
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*
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* This is SipHash 2-4 variant.
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*
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* Two changes are made:
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* - returns also 128 bits, not only 64;
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* - done streaming (can be calculated in parts).
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*
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* On short strings (URL, search phrases) more than 3 times faster than MD5 from OpenSSL.
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* (~ 700 MB/sec, 15 million strings per second)
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*/
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#include <bit>
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#include <string>
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#include <type_traits>
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#include <Core/Defines.h>
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#include <base/extended_types.h>
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#include <base/types.h>
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#include <base/unaligned.h>
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#include <base/hex.h>
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#include <Common/Exception.h>
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#include <Common/transformEndianness.h>
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#include <city.h>
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namespace DB::ErrorCodes
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{
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extern const int LOGICAL_ERROR;
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}
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#define SIPROUND \
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do \
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{ \
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v0 += v1; v1 = std::rotl(v1, 13); v1 ^= v0; v0 = std::rotl(v0, 32); \
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v2 += v3; v3 = std::rotl(v3, 16); v3 ^= v2; \
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v0 += v3; v3 = std::rotl(v3, 21); v3 ^= v0; \
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v2 += v1; v1 = std::rotl(v1, 17); v1 ^= v2; v2 = std::rotl(v2, 32); \
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} while(0)
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/// Define macro CURRENT_BYTES_IDX for building index used in current_bytes array
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/// to ensure correct byte order on different endian machines
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#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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#define CURRENT_BYTES_IDX(i) (7 - i)
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#else
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#define CURRENT_BYTES_IDX(i) (i)
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#endif
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class SipHash
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{
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private:
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/// State.
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UInt64 v0;
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UInt64 v1;
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UInt64 v2;
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UInt64 v3;
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/// How many bytes have been processed.
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UInt64 cnt;
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/// Whether it should use the reference algo for 128-bit or CH's version
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bool is_reference_128;
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/// The current 8 bytes of input data.
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union
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{
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UInt64 current_word;
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UInt8 current_bytes[8];
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};
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ALWAYS_INLINE void finalize()
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{
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/// In the last free byte, we write the remainder of the division by 256.
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current_bytes[CURRENT_BYTES_IDX(7)] = static_cast<UInt8>(cnt);
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v3 ^= current_word;
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SIPROUND;
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SIPROUND;
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v0 ^= current_word;
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if (is_reference_128)
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v2 ^= 0xee;
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else
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v2 ^= 0xff;
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SIPROUND;
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SIPROUND;
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SIPROUND;
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SIPROUND;
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}
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public:
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/// Arguments - seed.
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SipHash(UInt64 key0 = 0, UInt64 key1 = 0, bool is_reference_128_ = false) /// NOLINT
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{
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/// Initialize the state with some random bytes and seed.
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v0 = 0x736f6d6570736575ULL ^ key0;
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v1 = 0x646f72616e646f6dULL ^ key1;
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v2 = 0x6c7967656e657261ULL ^ key0;
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v3 = 0x7465646279746573ULL ^ key1;
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is_reference_128 = is_reference_128_;
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if (is_reference_128)
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v1 ^= 0xee;
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cnt = 0;
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current_word = 0;
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}
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ALWAYS_INLINE void update(const char * data, UInt64 size)
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{
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const char * end = data + size;
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/// We'll finish to process the remainder of the previous update, if any.
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if (cnt & 7)
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{
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while (cnt & 7 && data < end)
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{
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current_bytes[CURRENT_BYTES_IDX(cnt & 7)] = *data;
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++data;
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++cnt;
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}
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/// If we still do not have enough bytes to an 8-byte word.
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if (cnt & 7)
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return;
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v3 ^= current_word;
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SIPROUND;
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SIPROUND;
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v0 ^= current_word;
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}
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cnt += end - data;
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while (data + 8 <= end)
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{
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current_word = unalignedLoadLittleEndian<UInt64>(data);
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v3 ^= current_word;
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SIPROUND;
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SIPROUND;
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v0 ^= current_word;
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data += 8;
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}
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/// Pad the remainder, which is missing up to an 8-byte word.
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current_word = 0;
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switch (end - data)
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{
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case 7: current_bytes[CURRENT_BYTES_IDX(6)] = data[6]; [[fallthrough]];
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case 6: current_bytes[CURRENT_BYTES_IDX(5)] = data[5]; [[fallthrough]];
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case 5: current_bytes[CURRENT_BYTES_IDX(4)] = data[4]; [[fallthrough]];
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case 4: current_bytes[CURRENT_BYTES_IDX(3)] = data[3]; [[fallthrough]];
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case 3: current_bytes[CURRENT_BYTES_IDX(2)] = data[2]; [[fallthrough]];
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case 2: current_bytes[CURRENT_BYTES_IDX(1)] = data[1]; [[fallthrough]];
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case 1: current_bytes[CURRENT_BYTES_IDX(0)] = data[0]; [[fallthrough]];
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case 0: break;
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}
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}
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template <typename Transform = void, typename T>
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ALWAYS_INLINE void update(const T & x)
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{
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if constexpr (std::endian::native == std::endian::big)
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{
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auto transformed_x = x;
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if constexpr (!std::is_same_v<Transform, void>)
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transformed_x = Transform()(x);
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else
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DB::transformEndianness<std::endian::little>(transformed_x);
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update(reinterpret_cast<const char *>(&transformed_x), sizeof(transformed_x)); /// NOLINT
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}
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else
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update(reinterpret_cast<const char *>(&x), sizeof(x)); /// NOLINT
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}
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ALWAYS_INLINE void update(const std::string & x) { update(x.data(), x.length()); }
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ALWAYS_INLINE void update(const std::string_view x) { update(x.data(), x.size()); }
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ALWAYS_INLINE void update(const char * s) { update(std::string_view(s)); }
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ALWAYS_INLINE UInt64 get64()
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{
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finalize();
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return v0 ^ v1 ^ v2 ^ v3;
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}
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template <typename T>
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requires (sizeof(T) == 8)
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ALWAYS_INLINE void get128(T & lo, T & hi)
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{
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finalize();
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lo = v0 ^ v1;
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hi = v2 ^ v3;
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}
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ALWAYS_INLINE UInt128 get128()
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{
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UInt128 res;
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get128(res.items[UInt128::_impl::little(0)], res.items[UInt128::_impl::little(1)]);
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return res;
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}
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UInt128 get128Reference()
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{
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if (!is_reference_128)
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throw DB::Exception(
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DB::ErrorCodes::LOGICAL_ERROR, "Logical error: can't call get128Reference when is_reference_128 is not set");
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finalize();
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const auto lo = v0 ^ v1 ^ v2 ^ v3;
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v1 ^= 0xdd;
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SIPROUND;
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SIPROUND;
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SIPROUND;
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SIPROUND;
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const auto hi = v0 ^ v1 ^ v2 ^ v3;
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UInt128 res = hi;
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res <<= 64;
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res |= lo;
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return res;
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}
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};
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#undef ROTL
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#undef SIPROUND
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#include <cstddef>
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inline std::array<char, 16> getSipHash128AsArray(SipHash & sip_hash)
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{
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std::array<char, 16> arr;
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*reinterpret_cast<UInt128*>(arr.data()) = sip_hash.get128();
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return arr;
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}
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inline CityHash_v1_0_2::uint128 getSipHash128AsPair(SipHash & sip_hash)
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{
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CityHash_v1_0_2::uint128 result;
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sip_hash.get128(result.low64, result.high64);
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return result;
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}
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inline UInt128 sipHash128Keyed(UInt64 key0, UInt64 key1, const char * data, const size_t size)
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{
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SipHash hash(key0, key1);
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hash.update(data, size);
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return hash.get128();
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}
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inline UInt128 sipHash128(const char * data, const size_t size)
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{
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return sipHash128Keyed(0, 0, data, size);
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}
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inline String sipHash128String(const char * data, const size_t size)
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{
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return getHexUIntLowercase(sipHash128(data, size));
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}
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inline String sipHash128String(const String & str)
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{
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return sipHash128String(str.data(), str.size());
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}
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inline UInt128 sipHash128ReferenceKeyed(UInt64 key0, UInt64 key1, const char * data, const size_t size)
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{
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SipHash hash(key0, key1, true);
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hash.update(data, size);
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return hash.get128Reference();
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}
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inline UInt128 sipHash128Reference(const char * data, const size_t size)
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{
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return sipHash128ReferenceKeyed(0, 0, data, size);
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}
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inline UInt64 sipHash64Keyed(UInt64 key0, UInt64 key1, const char * data, const size_t size)
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{
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SipHash hash(key0, key1);
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hash.update(data, size);
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return hash.get64();
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}
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inline UInt64 sipHash64(const char * data, const size_t size)
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{
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return sipHash64Keyed(0, 0, data, size);
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}
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template <typename T>
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inline UInt64 sipHash64(const T & x)
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{
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SipHash hash;
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hash.update(x);
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return hash.get64();
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}
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inline UInt64 sipHash64(const std::string & s)
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{
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return sipHash64(s.data(), s.size());
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}
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#undef CURRENT_BYTES_IDX
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