src/primitives/block.cpp: endian compatibility in GetHash

random-zebra · random-zebra · commit b5e5de609bbc · 2020-04-24T23:19:58.000+02:00
adapted from bitcoin/bitcoin@81aeb28
diff --git a/src/primitives/block.cpp b/src/primitives/block.cpp
@@ -15,13 +15,46 @@
 
 uint256 CBlockHeader::GetHash() const
 {
+#if defined(WORDS_BIGENDIAN)
+    if (nVersion < 4)  {
+        uint8_t data[80];
+        WriteLE32(&data[0], nVersion);
+        memcpy(&data[4], hashPrevBlock.begin(), hashPrevBlock.size());
+        memcpy(&data[36], hashMerkleRoot.begin(), hashMerkleRoot.size());
+        WriteLE32(&data[68], nTime);
+        WriteLE32(&data[72], nBits);
+        WriteLE32(&data[76], nNonce);
+        return HashQuark(data, data + 80);
+    } else if (nVersion < 7) {
+        uint8_t data[112];
+        WriteLE32(&data[0], nVersion);
+        memcpy(&data[4], hashPrevBlock.begin(), hashPrevBlock.size());
+        memcpy(&data[36], hashMerkleRoot.begin(), hashMerkleRoot.size());
+        WriteLE32(&data[68], nTime);
+        WriteLE32(&data[72], nBits);
+        WriteLE32(&data[76], nNonce);
+        memcpy(&data[80], hashMerkleRoot.begin(), hashMerkleRoot.size());
+        return Hash(data, data + 80);
+    } else {
+        uint8_t data[80];
+        WriteLE32(&data[0], nVersion);
+        memcpy(&data[4], hashPrevBlock.begin(), hashPrevBlock.size());
+        memcpy(&data[36], hashMerkleRoot.begin(), hashMerkleRoot.size());
+        WriteLE32(&data[68], nTime);
+        WriteLE32(&data[72], nBits);
+        WriteLE32(&data[76], nNonce);
+        return Hash(data, data + 80);
+    }
+
+#else // Can take shortcut for little endian
     if (nVersion < 4)
         return HashQuark(BEGIN(nVersion), END(nNonce));
 
     if (nVersion < 7)
         return Hash(BEGIN(nVersion), END(nAccumulatorCheckpoint));
 
     return Hash(BEGIN(nVersion), END(nNonce));
+#endif
 }
 
 std::string CBlock::ToString() const
