From 80396a7a0f6a65377974c2b26e84a1ae33051591 Mon Sep 17 00:00:00 2001
From: Jianping Wu <jianpingw@gmail.com>
Date: Wed, 6 Mar 2019 13:12:55 -0800
Subject: [PATCH] WIP: added cn header to block header.

---
 src/primitives/block.cpp |  7 ++---
 src/primitives/block.h   | 67 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+), 5 deletions(-)

diff --git a/src/primitives/block.cpp b/src/primitives/block.cpp
index e7d68003f..f2667ec02 100644
--- a/src/primitives/block.cpp
+++ b/src/primitives/block.cpp
@@ -9,11 +9,8 @@
 #include <tinyformat.h>
 #include <utilstrencodings.h>
 #include <crypto/common.h>
-//#include <crypto/scrypt.h>
-extern "C"
-{
-    #include <cryptonight/hash-ops.h>
-}
+
+extern "C" void cn_slow_hash(const void *data, size_t length, char *hash, int variant, int prehashed);
 
 uint256 CBlockHeader::GetHash() const
 {
diff --git a/src/primitives/block.h b/src/primitives/block.h
index ce00716cf..9372e3182 100644
--- a/src/primitives/block.h
+++ b/src/primitives/block.h
@@ -10,6 +10,66 @@
 #include <serialize.h>
 #include <uint256.h>
 
+#include <cryptonote_core/cryptonote_format_utils.h>
+
+/**
+ * This header is to store the proof-of-work of cryptonote mining.
+ * Kevacoin uses Cryptonight PoW and uses its existing infrastructure
+ * (mining pools and miners)
+ */
+class CryptoNoteHeader
+{
+public:
+    uint8_t major_version;
+    uint8_t minor_version;  // now used as a voting mechanism, rather than how this particular block is built
+    uint64_t timestamp;
+    uint256  prev_id;
+    uint32_t nonce;
+    uint256  merkle_root;
+    size_t   nTxes; // Number of transactions.
+
+    CryptoNoteHeader()
+    {
+        SetNull();
+    }
+
+    void SetNull()
+    {
+        major_version = 0;
+        minor_version = 0;
+        prev_id.SetNull();
+        timestamp = 0;
+        nonce = 0;
+        merkle_root.SetNull();
+        nTxes = 0;
+    }
+
+    bool IsNull() const
+    {
+        return (timestamp == 0);
+    }
+
+    BEGIN_SERIALIZE()
+      VARINT_FIELD(major_version)
+      VARINT_FIELD(minor_version)
+      VARINT_FIELD(timestamp)
+      crypto::hash prev_hash;
+      memcpy(&prev_hash, prev_id.begin(), prev_id.size());
+      FIELD(prev_hash)
+      FIELD(nonce)
+    END_SERIALIZE()
+
+    ADD_SERIALIZE_METHODS;
+
+    template <typename Stream, typename Operation>
+    inline void SerializationOp(Stream& s, Operation ser_action) {
+        std::string blob = cryptonote::t_serializable_object_to_blob(*this);
+        blob.append(reinterpret_cast<const char*>(merkle_root.begin()), merkle_root.size());
+        blob.append(tools::get_varint_data(nTxes + 1));
+        READWRITE(blob);
+    }
+};
+
 /** Nodes collect new transactions into a block, hash them into a hash tree,
  * and scan through nonce values to make the block's hash satisfy proof-of-work
  * requirements.  When they solve the proof-of-work, they broadcast the block
@@ -28,6 +88,9 @@ public:
     uint32_t nBits;
     uint32_t nNonce;
 
+    // CryptoNote header for emulation or merged mining
+    CryptoNoteHeader cnHeader;
+
     CBlockHeader()
     {
         SetNull();
@@ -43,6 +106,10 @@ public:
         READWRITE(nTime);
         READWRITE(nBits);
         READWRITE(nNonce);
+        // Genesis block does not have cnHeader.
+        if (!hashPrevBlock.IsNull()) {
+            READWRITE(cnHeader);
+        }
     }
 
     void SetNull()