PoS improvements

2018-07-18 17:42:15 -07:00
parent 37ad688668
commit c5325a3256
12 changed files with 260 additions and 43 deletions
--- a/src/primitives/nonce.cpp
+++ b/src/primitives/nonce.cpp
@@ -0,0 +1,68 @@
+// Copyright (c) 2018 Michael Toutonghi
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "hash.h"
+#include "nonce.h"
+#include <cstring>
+
+extern char ASSETCHAINS_SYMBOL[65];
+
+bool CPOSNonce::NewPOSActive(int32_t height)
+{
+    if ((strcmp(ASSETCHAINS_SYMBOL, "VRSC") == 0) || (height < (96480 + 100)))
+        return false;
+    else if ((strcmp(ASSETCHAINS_SYMBOL, "VRSCTEST") == 0) && (height < (1000 + 100)))
+        return false;
+    else
+        return true;
+}
+
+bool CPOSNonce::NewNonceActive(int32_t height)
+{
+    if ((strcmp(ASSETCHAINS_SYMBOL, "VRSC") == 0) || (height < 96480))
+        return false;
+    else if ((strcmp(ASSETCHAINS_SYMBOL, "VRSCTEST") == 0) && (height < 1000))
+        return false;
+    else
+        return true;
+}
+
+void CPOSNonce::SetPOSEntropy(const uint256 &pastHash, uint256 txid, int32_t voutNum)
+{
+    // get low 96 bits of past hash and put it in top 96 bits of low 128 bits of nonce
+    CVerusHashWriter hashWriter = CVerusHashWriter(SER_GETHASH, PROTOCOL_VERSION);
+
+    // first hash the pastHash, txid, and voutNum, to create a combined 96 bits, which will be used in the nonce
+    hashWriter << pastHash;
+    hashWriter << txid;
+    hashWriter << voutNum;
+
+    arith_uint256 arNonce = (UintToArith256(*this) & 0xffffffff) |
+        ((UintToArith256(hashWriter.GetHash()) & UintToArith256(uint256S("0000000000000000000000000000000000000000ffffffffffffffffffffffff"))) << 32);
+
+    hashWriter = CVerusHashWriter(SER_GETHASH, PROTOCOL_VERSION);
+    hashWriter << ArithToUint256(arNonce);
+
+    *this = CPOSNonce(ArithToUint256(UintToArith256(hashWriter.GetHash()) << 128 | arNonce));
+}
+
+bool CPOSNonce::CheckPOSEntropy(const uint256 &pastHash, uint256 txid, int32_t voutNum)
+{
+    // get low 96 bits of past hash and put it in top 96 bits of low 128 bits of nonce
+    CVerusHashWriter hashWriter = CVerusHashWriter(SER_GETHASH, PROTOCOL_VERSION);
+
+    // first hash the pastHash, txid, and voutNum, to create a combined 96 bits, which will be used in the nonce
+    hashWriter << pastHash;
+    hashWriter << txid;
+    hashWriter << voutNum;
+
+    arith_uint256 arNonce = (UintToArith256(*this) & 0xffffffff) |
+        ((UintToArith256(hashWriter.GetHash()) & UintToArith256(uint256S("0000000000000000000000000000000000000000ffffffffffffffffffffffff"))) << 32);
+
+    hashWriter = CVerusHashWriter(SER_GETHASH, PROTOCOL_VERSION);
+    hashWriter << ArithToUint256(arNonce);
+
+    return UintToArith256(*this) == (UintToArith256(hashWriter.GetHash()) << 128 | arNonce);
+}
+