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// Copyright (c) 2016-2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <crypto/siphash.h>
#define ROTL(x, b) (uint64_t)(((x) << (b)) | ((x) >> (64 - (b))))
#define SIPROUND do { \
v0 += v1; v1 = ROTL(v1, 13); v1 ^= v0; \
v0 = ROTL(v0, 32); \
v2 += v3; v3 = ROTL(v3, 16); v3 ^= v2; \
v0 += v3; v3 = ROTL(v3, 21); v3 ^= v0; \
v2 += v1; v1 = ROTL(v1, 17); v1 ^= v2; \
v2 = ROTL(v2, 32); \
} while (0)
CSipHasher::CSipHasher(uint64_t k0, uint64_t k1)
{
v[0] = 0x736f6d6570736575ULL ^ k0;
v[1] = 0x646f72616e646f6dULL ^ k1;
v[2] = 0x6c7967656e657261ULL ^ k0;
v[3] = 0x7465646279746573ULL ^ k1;
count = 0;
tmp = 0;
}
CSipHasher& CSipHasher::Write(uint64_t data)
{
uint64_t v0 = v[0], v1 = v[1], v2 = v[2], v3 = v[3];
assert(count % 8 == 0);
v3 ^= data;
SIPROUND;
SIPROUND;
v0 ^= data;
v[0] = v0;
v[1] = v1;
v[2] = v2;
v[3] = v3;
count += 8;
return *this;
}
CSipHasher& CSipHasher::Write(Span<const unsigned char> data)
{
uint64_t v0 = v[0], v1 = v[1], v2 = v[2], v3 = v[3];
uint64_t t = tmp;
uint8_t c = count;
while (data.size() > 0) {
t |= uint64_t{data.front()} << (8 * (c % 8));
c++;
if ((c & 7) == 0) {
v3 ^= t;
SIPROUND;
SIPROUND;
v0 ^= t;
t = 0;
}
data = data.subspan(1);
}
v[0] = v0;
v[1] = v1;
v[2] = v2;
v[3] = v3;
count = c;
tmp = t;
return *this;
}
uint64_t CSipHasher::Finalize() const
{
uint64_t v0 = v[0], v1 = v[1], v2 = v[2], v3 = v[3];
uint64_t t = tmp | (((uint64_t)count) << 56);
v3 ^= t;
SIPROUND;
SIPROUND;
v0 ^= t;
v2 ^= 0xFF;
SIPROUND;
SIPROUND;
SIPROUND;
SIPROUND;
return v0 ^ v1 ^ v2 ^ v3;
}
uint64_t SipHashUint256(uint64_t k0, uint64_t k1, const uint256& val)
{
/* Specialized implementation for efficiency */
uint64_t d = val.GetUint64(0);
uint64_t v0 = 0x736f6d6570736575ULL ^ k0;
uint64_t v1 = 0x646f72616e646f6dULL ^ k1;
uint64_t v2 = 0x6c7967656e657261ULL ^ k0;
uint64_t v3 = 0x7465646279746573ULL ^ k1 ^ d;
SIPROUND;
SIPROUND;
v0 ^= d;
d = val.GetUint64(1);
v3 ^= d;
SIPROUND;
SIPROUND;
v0 ^= d;
d = val.GetUint64(2);
v3 ^= d;
SIPROUND;
SIPROUND;
v0 ^= d;
d = val.GetUint64(3);
v3 ^= d;
SIPROUND;
SIPROUND;
v0 ^= d;
v3 ^= (uint64_t{4}) << 59;
SIPROUND;
SIPROUND;
v0 ^= (uint64_t{4}) << 59;
v2 ^= 0xFF;
SIPROUND;
SIPROUND;
SIPROUND;
SIPROUND;
return v0 ^ v1 ^ v2 ^ v3;
}
uint64_t SipHashUint256Extra(uint64_t k0, uint64_t k1, const uint256& val, uint32_t extra)
{
/* Specialized implementation for efficiency */
uint64_t d = val.GetUint64(0);
uint64_t v0 = 0x736f6d6570736575ULL ^ k0;
uint64_t v1 = 0x646f72616e646f6dULL ^ k1;
uint64_t v2 = 0x6c7967656e657261ULL ^ k0;
uint64_t v3 = 0x7465646279746573ULL ^ k1 ^ d;
SIPROUND;
SIPROUND;
v0 ^= d;
d = val.GetUint64(1);
v3 ^= d;
SIPROUND;
SIPROUND;
v0 ^= d;
d = val.GetUint64(2);
v3 ^= d;
SIPROUND;
SIPROUND;
v0 ^= d;
d = val.GetUint64(3);
v3 ^= d;
SIPROUND;
SIPROUND;
v0 ^= d;
d = ((uint64_t{36}) << 56) | extra;
v3 ^= d;
SIPROUND;
SIPROUND;
v0 ^= d;
v2 ^= 0xFF;
SIPROUND;
SIPROUND;
SIPROUND;
SIPROUND;
return v0 ^ v1 ^ v2 ^ v3;
}
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