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-rw-r--r--src/crypto/siphash.cpp173
-rw-r--r--src/crypto/siphash.h47
2 files changed, 220 insertions, 0 deletions
diff --git a/src/crypto/siphash.cpp b/src/crypto/siphash.cpp
new file mode 100644
index 0000000000..e81957111a
--- /dev/null
+++ b/src/crypto/siphash.cpp
@@ -0,0 +1,173 @@
+// Copyright (c) 2016-2018 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(const unsigned char* data, size_t size)
+{
+ uint64_t v0 = v[0], v1 = v[1], v2 = v[2], v3 = v[3];
+ uint64_t t = tmp;
+ int c = count;
+
+ while (size--) {
+ t |= ((uint64_t)(*(data++))) << (8 * (c % 8));
+ c++;
+ if ((c & 7) == 0) {
+ v3 ^= t;
+ SIPROUND;
+ SIPROUND;
+ v0 ^= t;
+ t = 0;
+ }
+ }
+
+ 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;
+}
diff --git a/src/crypto/siphash.h b/src/crypto/siphash.h
new file mode 100644
index 0000000000..b312f913f9
--- /dev/null
+++ b/src/crypto/siphash.h
@@ -0,0 +1,47 @@
+// Copyright (c) 2016-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_CRYPTO_SIPHASH_H
+#define BITCOIN_CRYPTO_SIPHASH_H
+
+#include <stdint.h>
+
+#include <uint256.h>
+
+/** SipHash-2-4 */
+class CSipHasher
+{
+private:
+ uint64_t v[4];
+ uint64_t tmp;
+ int count;
+
+public:
+ /** Construct a SipHash calculator initialized with 128-bit key (k0, k1) */
+ CSipHasher(uint64_t k0, uint64_t k1);
+ /** Hash a 64-bit integer worth of data
+ * It is treated as if this was the little-endian interpretation of 8 bytes.
+ * This function can only be used when a multiple of 8 bytes have been written so far.
+ */
+ CSipHasher& Write(uint64_t data);
+ /** Hash arbitrary bytes. */
+ CSipHasher& Write(const unsigned char* data, size_t size);
+ /** Compute the 64-bit SipHash-2-4 of the data written so far. The object remains untouched. */
+ uint64_t Finalize() const;
+};
+
+/** Optimized SipHash-2-4 implementation for uint256.
+ *
+ * It is identical to:
+ * SipHasher(k0, k1)
+ * .Write(val.GetUint64(0))
+ * .Write(val.GetUint64(1))
+ * .Write(val.GetUint64(2))
+ * .Write(val.GetUint64(3))
+ * .Finalize()
+ */
+uint64_t SipHashUint256(uint64_t k0, uint64_t k1, const uint256& val);
+uint64_t SipHashUint256Extra(uint64_t k0, uint64_t k1, const uint256& val, uint32_t extra);
+
+#endif // BITCOIN_CRYPTO_SIPHASH_H