Initial Vexta Core v0.1.0 release

src/hash.cpp

@@ -0,0 +1,99 @@
+// Copyright (c) 2013-2020 The Bitcoin Core developers
+// Copyright (c) 2014-2020 The DigiByte Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <hash.h>
+#include <crypto/common.h>
+#include <crypto/hmac_sha512.h>
+
+#include <string>
+
+inline uint32_t ROTL32(uint32_t x, int8_t r)
+{
+    return (x << r) | (x >> (32 - r));
+}
+
+unsigned int MurmurHash3(unsigned int nHashSeed, Span<const unsigned char> vDataToHash)
+{
+    // The following is MurmurHash3 (x86_32), see https://code.google.com/p/smhasher/source/browse/trunk/MurmurHash3.cpp
+    uint32_t h1 = nHashSeed;
+    const uint32_t c1 = 0xcc9e2d51;
+    const uint32_t c2 = 0x1b873593;
+
+    const int nblocks = vDataToHash.size() / 4;
+
+    //----------
+    // body
+    const uint8_t* blocks = vDataToHash.data();
+
+    for (int i = 0; i < nblocks; ++i) {
+        uint32_t k1 = ReadLE32(blocks + i*4);
+
+        k1 *= c1;
+        k1 = ROTL32(k1, 15);
+        k1 *= c2;
+
+        h1 ^= k1;
+        h1 = ROTL32(h1, 13);
+        h1 = h1 * 5 + 0xe6546b64;
+    }
+
+    //----------
+    // tail
+    const uint8_t* tail = vDataToHash.data() + nblocks * 4;
+
+    uint32_t k1 = 0;
+
+    switch (vDataToHash.size() & 3) {
+        case 3:
+            k1 ^= tail[2] << 16;
+            [[fallthrough]];
+        case 2:
+            k1 ^= tail[1] << 8;
+            [[fallthrough]];
+        case 1:
+            k1 ^= tail[0];
+            k1 *= c1;
+            k1 = ROTL32(k1, 15);
+            k1 *= c2;
+            h1 ^= k1;
+    }
+
+    //----------
+    // finalization
+    h1 ^= vDataToHash.size();
+    h1 ^= h1 >> 16;
+    h1 *= 0x85ebca6b;
+    h1 ^= h1 >> 13;
+    h1 *= 0xc2b2ae35;
+    h1 ^= h1 >> 16;
+
+    return h1;
+}
+
+void BIP32Hash(const ChainCode &chainCode, unsigned int nChild, unsigned char header, const unsigned char data[32], unsigned char output[64])
+{
+    unsigned char num[4];
+    num[0] = (nChild >> 24) & 0xFF;
+    num[1] = (nChild >> 16) & 0xFF;
+    num[2] = (nChild >>  8) & 0xFF;
+    num[3] = (nChild >>  0) & 0xFF;
+    CHMAC_SHA512(chainCode.begin(), chainCode.size()).Write(&header, 1).Write(data, 32).Write(num, 4).Finalize(output);
+}
+
+uint256 SHA256Uint256(const uint256& input)
+{
+    uint256 result;
+    CSHA256().Write(input.begin(), 32).Finalize(result.begin());
+    return result;
+}
+
+CHashWriter TaggedHash(const std::string& tag)
+{
+    CHashWriter writer(SER_GETHASH, 0);
+    uint256 taghash;
+    CSHA256().Write((const unsigned char*)tag.data(), tag.size()).Finalize(taghash.begin());
+    writer << taghash << taghash;
+    return writer;
+}