hash/siphash: add an (ugly) siphash128 implementation
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107
hash/siphash.cpp
107
hash/siphash.cpp
@ -12,6 +12,8 @@
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#include "../debug/assert.hpp"
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#include "../endian.hpp"
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#include <bit>
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using cruft::hash::siphash;
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@ -43,6 +45,19 @@ round (u64 v[4])
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}
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//-----------------------------------------------------------------------------
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static void
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compress (int const iterations, u64 state[4], u08 const data[8])
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{
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u64 word = cruft::readle<u64> (data);
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state[3] ^= word;
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for (int c = 0; c < iterations; ++c)
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round (state);
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state[0] ^= word;
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}
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///////////////////////////////////////////////////////////////////////////////
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static
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std::array<u64, 2>
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@ -73,23 +88,35 @@ bytes_to_u64 (std::span<u08, 16> val)
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///////////////////////////////////////////////////////////////////////////////
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template <int C, int D>
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siphash<C,D>::siphash (std::array<u64,2> _key) noexcept:
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template <int CompressionsV, int FinalisationsV, int OutputV>
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siphash<
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CompressionsV,
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FinalisationsV,
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OutputV
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>::siphash (std::array<u64,2> _key) noexcept:
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m_key (_key)
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{ ; }
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//-----------------------------------------------------------------------------
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template <int C, int D>
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siphash<C, D>::siphash (std::span<u08, 16> _key) noexcept
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template <int CompressionsV, int FinalisationsV, int OutputV>
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siphash<
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CompressionsV,
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FinalisationsV,
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OutputV
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>::siphash (std::span<u08, 16> _key) noexcept
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: siphash (bytes_to_u64 (_key))
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{ ; }
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///////////////////////////////////////////////////////////////////////////////
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template <int C, int D>
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typename siphash<C,D>::digest_t
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siphash<C,D>::operator() (cruft::view<u08 const*> data) const noexcept
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template <int CompressionsV, int FinalisationsV, int OutputV>
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typename siphash<CompressionsV, FinalisationsV, OutputV>::digest_t
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siphash<
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CompressionsV,
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FinalisationsV,
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OutputV
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>::operator() (cruft::view<u08 const*> data) const noexcept
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{
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// init
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u64 state[4] = {
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@ -99,45 +126,53 @@ siphash<C,D>::operator() (cruft::view<u08 const*> data) const noexcept
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m_key[1] ^ INITIALISERS[3],
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};
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// update
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auto cursor = data.begin ();
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for ( ; data.end () - cursor >= 8; cursor += sizeof (u64)) {
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auto word = readle<u64> (cursor);
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if (OutputV == 16)
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state[1] ^= 0xee;
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state[3] ^= word;
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for (int c = 0; c < C; ++c)
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round (state);
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state[0] ^= word;
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}
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// update
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auto const tailsize = data.size() % 8;
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auto cursor = data.begin ();
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for (auto const last = data.begin () + data.size () - tailsize; cursor != last; cursor += sizeof (u64))
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compress (compression_rounds, state, cursor);
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// drain
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union {
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u64 d64 = 0;
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u08 d08[8];
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} accum;
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if (cursor != data.cend ()) {
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std::copy (cursor, data.cend (), std::begin (accum.d08));
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cursor = data.cend ();
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}
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u08 remain[8] {};
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memcpy (remain, cursor, tailsize);
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cursor += tailsize;
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CHECK_EQ (cursor, data.cend ());
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// append the length
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accum.d08[7] = data.size ();
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state[3] ^= accum.d64;
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for (int c = 0; c < C; ++c)
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round (state);
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state[0] ^= accum.d64;
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// append the length
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remain[7] = data.size ();
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compress (compression_rounds, state, remain);
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// finalisation
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state[2] ^= 0xff;
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for (int d = 0; d < D; ++d)
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if constexpr (OutputV == 8)
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state[2] ^= 0xff;
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else
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state[2] ^= 0xee;
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for (int d = 0; d < FinalisationsV; ++d)
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round (state);
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return state[0] ^ state[1] ^ state[2] ^ state[3];
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auto const res0 = cruft::htol (state[0] ^ state[1] ^ state[2] ^ state[3]);
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if constexpr (OutputV == 8) {
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return std::bit_cast<digest_t> (res0);
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} else {
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state[1] ^= 0xdd;
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for (int i = 0; i < FinalisationsV; ++i)
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round (state);
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auto const res1 = cruft::htol (state[0] ^ state[1] ^ state[2] ^ state[3]);
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std::array<u08, 16> res;
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memcpy (res.data () + 0, &res0, sizeof (res0));
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memcpy (res.data () + 8, &res1, sizeof (res1));
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return res;
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}
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}
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///////////////////////////////////////////////////////////////////////////////
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template class cruft::hash::siphash<2,4>;
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template class cruft::hash::siphash<2,4, 8>;
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template class cruft::hash::siphash<2,4, 16>;
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@ -15,20 +15,45 @@
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#include <span>
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namespace cruft::hash {
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template <int CompressionsV = 2, int FinalisationsV = 4>
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constexpr int SIPHASH_DEFAULT_COMPRESSIONS = 2;
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constexpr int SIPHASH_DEFAULT_FINALISATIONS = 4;
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template <
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int CompressionsV = SIPHASH_DEFAULT_COMPRESSIONS,
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int FinalisationsV = SIPHASH_DEFAULT_FINALISATIONS,
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int OutV = 8
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>
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class siphash {
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public:
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using digest_t = u64;
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static_assert (OutV == 8 or OutV == 16);
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static constexpr auto output_length = OutV;
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static constexpr auto compression_rounds = CompressionsV;
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static constexpr auto finalisation_rounds = FinalisationsV;
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using digest_t = std::array<u08, output_length>;
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siphash (std::array<u64, 2>) noexcept;
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siphash (std::span<u08, 16>) noexcept;
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digest_t operator() (cruft::view<u08 const*> data) const noexcept;
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private:
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std::array<u64,2> m_key;
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std::array<u64, 2> m_key;
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};
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};
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template <
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int CompressionsV = SIPHASH_DEFAULT_COMPRESSIONS,
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int FinalisationsV = SIPHASH_DEFAULT_FINALISATIONS
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>
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using siphash64 = siphash<CompressionsV, FinalisationsV, 8>;
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template <
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int CompressionsV = SIPHASH_DEFAULT_COMPRESSIONS,
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int FinalisationsV = SIPHASH_DEFAULT_FINALISATIONS
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>
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using siphash128 = siphash<CompressionsV, FinalisationsV, 16>;
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}
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@ -1,4 +1,3 @@
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#include "tap.hpp"
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#include "hash/siphash.hpp"
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@ -8,7 +7,7 @@
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/// Test vectors from the reference implementation:
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/// https://github.com/veorq/SipHash
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static constexpr u08
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VECTORS128[][8] = {
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VECTORS64[][8] = {
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/* 0 */ { 0x31, 0x0e, 0x0e, 0xdd, 0x47, 0xdb, 0x6f, 0x72, },
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/* 1 */ { 0xfd, 0x67, 0xdc, 0x93, 0xc5, 0x39, 0xf8, 0x74, },
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/* 2 */ { 0x5a, 0x4f, 0xa9, 0xd9, 0x09, 0x80, 0x6c, 0x0d, },
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@ -76,6 +75,76 @@ VECTORS128[][8] = {
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};
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//-----------------------------------------------------------------------------
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static constexpr u08
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VECTORS128[][16] = {
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/* 0 */ { 0xa3, 0x81, 0x7f, 0x04, 0xba, 0x25, 0xa8, 0xe6, 0x6d, 0xf6, 0x72, 0x14, 0xc7, 0x55, 0x02, 0x93, },
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/* 1 */ { 0xda, 0x87, 0xc1, 0xd8, 0x6b, 0x99, 0xaf, 0x44, 0x34, 0x76, 0x59, 0x11, 0x9b, 0x22, 0xfc, 0x45, },
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/* 2 */ { 0x81, 0x77, 0x22, 0x8d, 0xa4, 0xa4, 0x5d, 0xc7, 0xfc, 0xa3, 0x8b, 0xde, 0xf6, 0x0a, 0xff, 0xe4, },
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/* 3 */ { 0x9c, 0x70, 0xb6, 0x0c, 0x52, 0x67, 0xa9, 0x4e, 0x5f, 0x33, 0xb6, 0xb0, 0x29, 0x85, 0xed, 0x51, },
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/* 4 */ { 0xf8, 0x81, 0x64, 0xc1, 0x2d, 0x9c, 0x8f, 0xaf, 0x7d, 0x0f, 0x6e, 0x7c, 0x7b, 0xcd, 0x55, 0x79, },
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/* 5 */ { 0x13, 0x68, 0x87, 0x59, 0x80, 0x77, 0x6f, 0x88, 0x54, 0x52, 0x7a, 0x07, 0x69, 0x0e, 0x96, 0x27, },
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/* 6 */ { 0x14, 0xee, 0xca, 0x33, 0x8b, 0x20, 0x86, 0x13, 0x48, 0x5e, 0xa0, 0x30, 0x8f, 0xd7, 0xa1, 0x5e, },
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/* 7 */ { 0xa1, 0xf1, 0xeb, 0xbe, 0xd8, 0xdb, 0xc1, 0x53, 0xc0, 0xb8, 0x4a, 0xa6, 0x1f, 0xf0, 0x82, 0x39, },
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/* 8 */ { 0x3b, 0x62, 0xa9, 0xba, 0x62, 0x58, 0xf5, 0x61, 0x0f, 0x83, 0xe2, 0x64, 0xf3, 0x14, 0x97, 0xb4, },
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/* 9 */ { 0x26, 0x44, 0x99, 0x06, 0x0a, 0xd9, 0xba, 0xab, 0xc4, 0x7f, 0x8b, 0x02, 0xbb, 0x6d, 0x71, 0xed, },
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/* 10 */ { 0x00, 0x11, 0x0d, 0xc3, 0x78, 0x14, 0x69, 0x56, 0xc9, 0x54, 0x47, 0xd3, 0xf3, 0xd0, 0xfb, 0xba, },
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/* 11 */ { 0x01, 0x51, 0xc5, 0x68, 0x38, 0x6b, 0x66, 0x77, 0xa2, 0xb4, 0xdc, 0x6f, 0x81, 0xe5, 0xdc, 0x18, },
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/* 12 */ { 0xd6, 0x26, 0xb2, 0x66, 0x90, 0x5e, 0xf3, 0x58, 0x82, 0x63, 0x4d, 0xf6, 0x85, 0x32, 0xc1, 0x25, },
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/* 13 */ { 0x98, 0x69, 0xe2, 0x47, 0xe9, 0xc0, 0x8b, 0x10, 0xd0, 0x29, 0x93, 0x4f, 0xc4, 0xb9, 0x52, 0xf7, },
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/* 14 */ { 0x31, 0xfc, 0xef, 0xac, 0x66, 0xd7, 0xde, 0x9c, 0x7e, 0xc7, 0x48, 0x5f, 0xe4, 0x49, 0x49, 0x02, },
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/* 15 */ { 0x54, 0x93, 0xe9, 0x99, 0x33, 0xb0, 0xa8, 0x11, 0x7e, 0x08, 0xec, 0x0f, 0x97, 0xcf, 0xc3, 0xd9, },
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/* 16 */ { 0x6e, 0xe2, 0xa4, 0xca, 0x67, 0xb0, 0x54, 0xbb, 0xfd, 0x33, 0x15, 0xbf, 0x85, 0x23, 0x05, 0x77, },
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/* 17 */ { 0x47, 0x3d, 0x06, 0xe8, 0x73, 0x8d, 0xb8, 0x98, 0x54, 0xc0, 0x66, 0xc4, 0x7a, 0xe4, 0x77, 0x40, },
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/* 18 */ { 0xa4, 0x26, 0xe5, 0xe4, 0x23, 0xbf, 0x48, 0x85, 0x29, 0x4d, 0xa4, 0x81, 0xfe, 0xae, 0xf7, 0x23, },
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/* 19 */ { 0x78, 0x01, 0x77, 0x31, 0xcf, 0x65, 0xfa, 0xb0, 0x74, 0xd5, 0x20, 0x89, 0x52, 0x51, 0x2e, 0xb1, },
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/* 20 */ { 0x9e, 0x25, 0xfc, 0x83, 0x3f, 0x22, 0x90, 0x73, 0x3e, 0x93, 0x44, 0xa5, 0xe8, 0x38, 0x39, 0xeb, },
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/* 21 */ { 0x56, 0x8e, 0x49, 0x5a, 0xbe, 0x52, 0x5a, 0x21, 0x8a, 0x22, 0x14, 0xcd, 0x3e, 0x07, 0x1d, 0x12, },
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/* 22 */ { 0x4a, 0x29, 0xb5, 0x45, 0x52, 0xd1, 0x6b, 0x9a, 0x46, 0x9c, 0x10, 0x52, 0x8e, 0xff, 0x0a, 0xae, },
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/* 23 */ { 0xc9, 0xd1, 0x84, 0xdd, 0xd5, 0xa9, 0xf5, 0xe0, 0xcf, 0x8c, 0xe2, 0x9a, 0x9a, 0xbf, 0x69, 0x1c, },
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/* 24 */ { 0x2d, 0xb4, 0x79, 0xae, 0x78, 0xbd, 0x50, 0xd8, 0x88, 0x2a, 0x8a, 0x17, 0x8a, 0x61, 0x32, 0xad, },
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/* 25 */ { 0x8e, 0xce, 0x5f, 0x04, 0x2d, 0x5e, 0x44, 0x7b, 0x50, 0x51, 0xb9, 0xea, 0xcb, 0x8d, 0x8f, 0x6f, },
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/* 26 */ { 0x9c, 0x0b, 0x53, 0xb4, 0xb3, 0xc3, 0x07, 0xe8, 0x7e, 0xae, 0xe0, 0x86, 0x78, 0x14, 0x1f, 0x66, },
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/* 27 */ { 0xab, 0xf2, 0x48, 0xaf, 0x69, 0xa6, 0xea, 0xe4, 0xbf, 0xd3, 0xeb, 0x2f, 0x12, 0x9e, 0xeb, 0x94, },
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/* 28 */ { 0x06, 0x64, 0xda, 0x16, 0x68, 0x57, 0x4b, 0x88, 0xb9, 0x35, 0xf3, 0x02, 0x73, 0x58, 0xae, 0xf4, },
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/* 29 */ { 0xaa, 0x4b, 0x9d, 0xc4, 0xbf, 0x33, 0x7d, 0xe9, 0x0c, 0xd4, 0xfd, 0x3c, 0x46, 0x7c, 0x6a, 0xb7, },
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/* 30 */ { 0xea, 0x5c, 0x7f, 0x47, 0x1f, 0xaf, 0x6b, 0xde, 0x2b, 0x1a, 0xd7, 0xd4, 0x68, 0x6d, 0x22, 0x87, },
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/* 31 */ { 0x29, 0x39, 0xb0, 0x18, 0x32, 0x23, 0xfa, 0xfc, 0x17, 0x23, 0xde, 0x4f, 0x52, 0xc4, 0x3d, 0x35, },
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/* 32 */ { 0x7c, 0x39, 0x56, 0xca, 0x5e, 0xea, 0xfc, 0x3e, 0x36, 0x3e, 0x9d, 0x55, 0x65, 0x46, 0xeb, 0x68, },
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/* 33 */ { 0x77, 0xc6, 0x07, 0x71, 0x46, 0xf0, 0x1c, 0x32, 0xb6, 0xb6, 0x9d, 0x5f, 0x4e, 0xa9, 0xff, 0xcf, },
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/* 34 */ { 0x37, 0xa6, 0x98, 0x6c, 0xb8, 0x84, 0x7e, 0xdf, 0x09, 0x25, 0xf0, 0xf1, 0x30, 0x9b, 0x54, 0xde, },
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/* 35 */ { 0xa7, 0x05, 0xf0, 0xe6, 0x9d, 0xa9, 0xa8, 0xf9, 0x07, 0x24, 0x1a, 0x2e, 0x92, 0x3c, 0x8c, 0xc8, },
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/* 36 */ { 0x3d, 0xc4, 0x7d, 0x1f, 0x29, 0xc4, 0x48, 0x46, 0x1e, 0x9e, 0x76, 0xed, 0x90, 0x4f, 0x67, 0x11, },
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/* 37 */ { 0x0d, 0x62, 0xbf, 0x01, 0xe6, 0xfc, 0x0e, 0x1a, 0x0d, 0x3c, 0x47, 0x51, 0xc5, 0xd3, 0x69, 0x2b, },
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/* 38 */ { 0x8c, 0x03, 0x46, 0x8b, 0xca, 0x7c, 0x66, 0x9e, 0xe4, 0xfd, 0x5e, 0x08, 0x4b, 0xbe, 0xe7, 0xb5, },
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/* 39 */ { 0x52, 0x8a, 0x5b, 0xb9, 0x3b, 0xaf, 0x2c, 0x9c, 0x44, 0x73, 0xcc, 0xe5, 0xd0, 0xd2, 0x2b, 0xd9, },
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/* 40 */ { 0xdf, 0x6a, 0x30, 0x1e, 0x95, 0xc9, 0x5d, 0xad, 0x97, 0xae, 0x0c, 0xc8, 0xc6, 0x91, 0x3b, 0xd8, },
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/* 41 */ { 0x80, 0x11, 0x89, 0x90, 0x2c, 0x85, 0x7f, 0x39, 0xe7, 0x35, 0x91, 0x28, 0x5e, 0x70, 0xb6, 0xdb, },
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/* 42 */ { 0xe6, 0x17, 0x34, 0x6a, 0xc9, 0xc2, 0x31, 0xbb, 0x36, 0x50, 0xae, 0x34, 0xcc, 0xca, 0x0c, 0x5b, },
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/* 43 */ { 0x27, 0xd9, 0x34, 0x37, 0xef, 0xb7, 0x21, 0xaa, 0x40, 0x18, 0x21, 0xdc, 0xec, 0x5a, 0xdf, 0x89, },
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/* 44 */ { 0x89, 0x23, 0x7d, 0x9d, 0xed, 0x9c, 0x5e, 0x78, 0xd8, 0xb1, 0xc9, 0xb1, 0x66, 0xcc, 0x73, 0x42, },
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/* 45 */ { 0x4a, 0x6d, 0x80, 0x91, 0xbf, 0x5e, 0x7d, 0x65, 0x11, 0x89, 0xfa, 0x94, 0xa2, 0x50, 0xb1, 0x4c, },
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/* 46 */ { 0x0e, 0x33, 0xf9, 0x60, 0x55, 0xe7, 0xae, 0x89, 0x3f, 0xfc, 0x0e, 0x3d, 0xcf, 0x49, 0x29, 0x02, },
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/* 47 */ { 0xe6, 0x1c, 0x43, 0x2b, 0x72, 0x0b, 0x19, 0xd1, 0x8e, 0xc8, 0xd8, 0x4b, 0xdc, 0x63, 0x15, 0x1b, },
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/* 48 */ { 0xf7, 0xe5, 0xae, 0xf5, 0x49, 0xf7, 0x82, 0xcf, 0x37, 0x90, 0x55, 0xa6, 0x08, 0x26, 0x9b, 0x16, },
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/* 49 */ { 0x43, 0x8d, 0x03, 0x0f, 0xd0, 0xb7, 0xa5, 0x4f, 0xa8, 0x37, 0xf2, 0xad, 0x20, 0x1a, 0x64, 0x03, },
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/* 50 */ { 0xa5, 0x90, 0xd3, 0xee, 0x4f, 0xbf, 0x04, 0xe3, 0x24, 0x7e, 0x0d, 0x27, 0xf2, 0x86, 0x42, 0x3f, },
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/* 51 */ { 0x5f, 0xe2, 0xc1, 0xa1, 0x72, 0xfe, 0x93, 0xc4, 0xb1, 0x5c, 0xd3, 0x7c, 0xae, 0xf9, 0xf5, 0x38, },
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/* 52 */ { 0x2c, 0x97, 0x32, 0x5c, 0xbd, 0x06, 0xb3, 0x6e, 0xb2, 0x13, 0x3d, 0xd0, 0x8b, 0x3a, 0x01, 0x7c, },
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/* 53 */ { 0x92, 0xc8, 0x14, 0x22, 0x7a, 0x6b, 0xca, 0x94, 0x9f, 0xf0, 0x65, 0x9f, 0x00, 0x2a, 0xd3, 0x9e, },
|
||||
/* 54 */ { 0xdc, 0xe8, 0x50, 0x11, 0x0b, 0xd8, 0x32, 0x8c, 0xfb, 0xd5, 0x08, 0x41, 0xd6, 0x91, 0x1d, 0x87, },
|
||||
/* 55 */ { 0x67, 0xf1, 0x49, 0x84, 0xc7, 0xda, 0x79, 0x12, 0x48, 0xe3, 0x2b, 0xb5, 0x92, 0x25, 0x83, 0xda, },
|
||||
/* 56 */ { 0x19, 0x38, 0xf2, 0xcf, 0x72, 0xd5, 0x4e, 0xe9, 0x7e, 0x94, 0x16, 0x6f, 0xa9, 0x1d, 0x2a, 0x36, },
|
||||
/* 57 */ { 0x74, 0x48, 0x1e, 0x96, 0x46, 0xed, 0x49, 0xfe, 0x0f, 0x62, 0x24, 0x30, 0x16, 0x04, 0x69, 0x8e, },
|
||||
/* 58 */ { 0x57, 0xfc, 0xa5, 0xde, 0x98, 0xa9, 0xd6, 0xd8, 0x00, 0x64, 0x38, 0xd0, 0x58, 0x3d, 0x8a, 0x1d, },
|
||||
/* 59 */ { 0x9f, 0xec, 0xde, 0x1c, 0xef, 0xdc, 0x1c, 0xbe, 0xd4, 0x76, 0x36, 0x74, 0xd9, 0x57, 0x53, 0x59, },
|
||||
/* 60 */ { 0xe3, 0x04, 0x0c, 0x00, 0xeb, 0x28, 0xf1, 0x53, 0x66, 0xca, 0x73, 0xcb, 0xd8, 0x72, 0xe7, 0x40, },
|
||||
/* 61 */ { 0x76, 0x97, 0x00, 0x9a, 0x6a, 0x83, 0x1d, 0xfe, 0xcc, 0xa9, 0x1c, 0x59, 0x93, 0x67, 0x0f, 0x7a, },
|
||||
/* 62 */ { 0x58, 0x53, 0x54, 0x23, 0x21, 0xf5, 0x67, 0xa0, 0x05, 0xd5, 0x47, 0xa4, 0xf0, 0x47, 0x59, 0xbd, },
|
||||
/* 63 */ { 0x51, 0x50, 0xd1, 0x77, 0x2f, 0x50, 0x83, 0x4a, 0x50, 0x3e, 0x06, 0x9a, 0x97, 0x3f, 0xbd, 0x7c, },
|
||||
};
|
||||
|
||||
|
||||
///////////////////////////////////////////////////////////////////////////////
|
||||
int
|
||||
main ()
|
||||
@ -90,13 +159,33 @@ main ()
|
||||
for (int i = 0; i < std::ssize (dat); ++i) {
|
||||
dat[i] = i;
|
||||
|
||||
u64 expected = 0;
|
||||
for (int j = 0; j < 8; ++j)
|
||||
expected |= u64 (VECTORS128[i][j]) << u64(j * 8);
|
||||
|
||||
cruft::hash::siphash<2,4> h (key);
|
||||
auto const computed = h ({dat, i});
|
||||
tap.expect_eq (computed, expected, "iteration {}", i);
|
||||
|
||||
bool const success = std::equal (
|
||||
computed.begin (),
|
||||
computed.end (),
|
||||
std::begin (VECTORS64[i]),
|
||||
std::end (VECTORS64[i])
|
||||
);
|
||||
|
||||
tap.expect (success, "u64 iteration {}", i);
|
||||
}
|
||||
|
||||
for (int i = 0; i < std::ssize (dat); ++i) {
|
||||
dat[i] = i;
|
||||
|
||||
cruft::hash::siphash<2,4,16> h (key);
|
||||
auto const computed = h ({dat, i});
|
||||
|
||||
bool const success = std::equal (
|
||||
computed.begin (),
|
||||
computed.end (),
|
||||
std::begin (VECTORS128[i]),
|
||||
std::end (VECTORS128[i])
|
||||
);
|
||||
|
||||
tap.expect (success, "u128 iteration {}", i);
|
||||
}
|
||||
|
||||
return tap.status ();
|
||||
|
||||
Loading…
Reference in New Issue
Block a user