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-rw-r--r--src/hash.cpp94
-rw-r--r--src/hash.h15
-rw-r--r--src/test/hash_tests.cpp20
-rw-r--r--src/uint256.h13
4 files changed, 142 insertions, 0 deletions
diff --git a/src/hash.cpp b/src/hash.cpp
index 7f3cf1a1fa..a518314a53 100644
--- a/src/hash.cpp
+++ b/src/hash.cpp
@@ -81,3 +81,97 @@ void BIP32Hash(const ChainCode &chainCode, unsigned int nChild, unsigned char he
num[3] = (nChild >> 0) & 0xFF;
CHMAC_SHA512(chainCode.begin(), chainCode.size()).Write(&header, 1).Write(data, 32).Write(num, 4).Finalize(output);
}
+
+#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;
+}
+
+CSipHasher& CSipHasher::Write(uint64_t data)
+{
+ uint64_t v0 = v[0], v1 = v[1], v2 = v[2], v3 = v[3];
+
+ v3 ^= data;
+ SIPROUND;
+ SIPROUND;
+ v0 ^= data;
+
+ v[0] = v0;
+ v[1] = v1;
+ v[2] = v2;
+ v[3] = v3;
+
+ count++;
+ return *this;
+}
+
+uint64_t CSipHasher::Finalize() const
+{
+ uint64_t v0 = v[0], v1 = v[1], v2 = v[2], v3 = v[3];
+
+ v3 ^= ((uint64_t)count) << 59;
+ SIPROUND;
+ SIPROUND;
+ v0 ^= ((uint64_t)count) << 59;
+ 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;
+}
diff --git a/src/hash.h b/src/hash.h
index 97955c8d5a..600dabec56 100644
--- a/src/hash.h
+++ b/src/hash.h
@@ -171,4 +171,19 @@ unsigned int MurmurHash3(unsigned int nHashSeed, const std::vector<unsigned char
void BIP32Hash(const ChainCode &chainCode, unsigned int nChild, unsigned char header, const unsigned char data[32], unsigned char output[64]);
+/** SipHash-2-4, using a uint64_t-based (rather than byte-based) interface */
+class CSipHasher
+{
+private:
+ uint64_t v[4];
+ int count;
+
+public:
+ CSipHasher(uint64_t k0, uint64_t k1);
+ CSipHasher& Write(uint64_t data);
+ uint64_t Finalize() const;
+};
+
+uint64_t SipHashUint256(uint64_t k0, uint64_t k1, const uint256& val);
+
#endif // BITCOIN_HASH_H
diff --git a/src/test/hash_tests.cpp b/src/test/hash_tests.cpp
index 35079d1614..8baaf3645f 100644
--- a/src/test/hash_tests.cpp
+++ b/src/test/hash_tests.cpp
@@ -47,4 +47,24 @@ BOOST_AUTO_TEST_CASE(murmurhash3)
#undef T
}
+BOOST_AUTO_TEST_CASE(siphash)
+{
+ CSipHasher hasher(0x0706050403020100ULL, 0x0F0E0D0C0B0A0908ULL);
+ BOOST_CHECK_EQUAL(hasher.Finalize(), 0x726fdb47dd0e0e31ull);
+ hasher.Write(0x0706050403020100ULL);
+ BOOST_CHECK_EQUAL(hasher.Finalize(), 0x93f5f5799a932462ull);
+ hasher.Write(0x0F0E0D0C0B0A0908ULL);
+ BOOST_CHECK_EQUAL(hasher.Finalize(), 0x3f2acc7f57c29bdbull);
+ hasher.Write(0x1716151413121110ULL);
+ BOOST_CHECK_EQUAL(hasher.Finalize(), 0xb8ad50c6f649af94ull);
+ hasher.Write(0x1F1E1D1C1B1A1918ULL);
+ BOOST_CHECK_EQUAL(hasher.Finalize(), 0x7127512f72f27cceull);
+ hasher.Write(0x2726252423222120ULL);
+ BOOST_CHECK_EQUAL(hasher.Finalize(), 0x0e3ea96b5304a7d0ull);
+ hasher.Write(0x2F2E2D2C2B2A2928ULL);
+ BOOST_CHECK_EQUAL(hasher.Finalize(), 0xe612a3cb9ecba951ull);
+
+ BOOST_CHECK_EQUAL(SipHashUint256(0x0706050403020100ULL, 0x0F0E0D0C0B0A0908ULL, uint256S("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100")), 0x7127512f72f27cceull);
+}
+
BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/uint256.h b/src/uint256.h
index bcdb6dd7c2..af1f3ab7d9 100644
--- a/src/uint256.h
+++ b/src/uint256.h
@@ -83,6 +83,19 @@ public:
return sizeof(data);
}
+ uint64_t GetUint64(int pos) const
+ {
+ const uint8_t* ptr = data + pos * 8;
+ return ((uint64_t)ptr[0]) | \
+ ((uint64_t)ptr[1]) << 8 | \
+ ((uint64_t)ptr[2]) << 16 | \
+ ((uint64_t)ptr[3]) << 24 | \
+ ((uint64_t)ptr[4]) << 32 | \
+ ((uint64_t)ptr[5]) << 40 | \
+ ((uint64_t)ptr[6]) << 48 | \
+ ((uint64_t)ptr[7]) << 56;
+ }
+
template<typename Stream>
void Serialize(Stream& s, int nType, int nVersion) const
{