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207 lines
5.2 KiB
C++
207 lines
5.2 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 <common/types.h>
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#include <common/unaligned.h>
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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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#define ROTL(x, b) static_cast<UInt64>(((x) << (b)) | ((x) >> (64 - (b))))
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#define SIPROUND \
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do \
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{ \
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v0 += v1; v1 = ROTL(v1, 13); v1 ^= v0; v0 = ROTL(v0, 32); \
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v2 += v3; v3 = ROTL(v3, 16); v3 ^= v2; \
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v0 += v3; v3 = ROTL(v3, 21); v3 ^= v0; \
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v2 += v1; v1 = ROTL(v1, 17); v1 ^= v2; v2 = ROTL(v2, 32); \
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} while(0)
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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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/// 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[7] = 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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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 k0 = 0, UInt64 k1 = 0)
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{
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/// Initialize the state with some random bytes and seed.
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v0 = 0x736f6d6570736575ULL ^ k0;
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v1 = 0x646f72616e646f6dULL ^ k1;
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v2 = 0x6c7967656e657261ULL ^ k0;
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v3 = 0x7465646279746573ULL ^ k1;
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cnt = 0;
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current_word = 0;
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}
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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[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 = unalignedLoad<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[6] = data[6]; [[fallthrough]];
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case 6: current_bytes[5] = data[5]; [[fallthrough]];
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case 5: current_bytes[4] = data[4]; [[fallthrough]];
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case 4: current_bytes[3] = data[3]; [[fallthrough]];
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case 3: current_bytes[2] = data[2]; [[fallthrough]];
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case 2: current_bytes[1] = data[1]; [[fallthrough]];
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case 1: current_bytes[0] = data[0]; [[fallthrough]];
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case 0: break;
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}
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}
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/// NOTE: std::has_unique_object_representations is only available since clang 6. As of Mar 2017 we still use clang 5 sometimes.
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template <typename T>
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std::enable_if_t<std::/*has_unique_object_representations_v*/is_standard_layout_v<T>, void> update(const T & x)
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{
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update(reinterpret_cast<const char *>(&x), sizeof(x));
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}
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void update(const std::string & x)
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{
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update(x.data(), x.length());
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}
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/// Get the result in some form. This can only be done once!
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void get128(char * out)
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{
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finalize();
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unalignedStore<UInt64>(out, v0 ^ v1);
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unalignedStore<UInt64>(out + 8, v2 ^ v3);
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}
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/// template for avoiding 'unsigned long long' vs 'unsigned long' problem on old poco in macos
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template <typename T>
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ALWAYS_INLINE void get128(T & lo, T & hi)
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{
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static_assert(sizeof(T) == 8);
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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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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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};
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#undef ROTL
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#undef SIPROUND
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#include <cstddef>
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inline void sipHash128(const char * data, const size_t size, char * out)
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{
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SipHash hash;
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hash.update(data, size);
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hash.get128(out);
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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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SipHash hash;
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hash.update(data, size);
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return hash.get64();
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}
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template <typename T>
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std::enable_if_t<std::/*has_unique_object_representations_v*/is_standard_layout_v<T>, 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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