65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
// Copyright (c) 2018 Michael Toutonghi
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_PRIMITIVES_NONCE_H
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#define BITCOIN_PRIMITIVES_NONCE_H
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#include "serialize.h"
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#include "uint256.h"
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#include "arith_uint256.h"
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/** For POS blocks, the nNonce of a block header holds the entropy source for the POS contest
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* in the latest VerusHash protocol
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* */
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class CPOSNonce : public uint256
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{
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public:
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static bool NewPOSActive(int32_t height);
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static bool NewNonceActive(int32_t height);
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static arith_uint256 entropyMask;
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static arith_uint256 posDiffMask;
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CPOSNonce() : uint256() { }
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CPOSNonce(const base_blob<256> &b) : uint256(b) { }
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CPOSNonce(const std::vector<unsigned char> &vch) : uint256(vch) { }
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int32_t GetPOSTarget() const
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{
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uint32_t nBits = 0;
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for (const unsigned char *p = begin() + 3; p >= begin(); p--)
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{
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nBits <<= 8;
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nBits += *p;
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}
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return nBits;
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}
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bool IsPOSNonce() const
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{
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arith_uint256 arNonce = UintToArith256(*this);
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arith_uint256 tmpNonce = ((arNonce << 128) >> 128);
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CVerusHashWriter hashWriter = CVerusHashWriter(SER_GETHASH, PROTOCOL_VERSION);
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hashWriter << ArithToUint256(tmpNonce);
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return (*this == ArithToUint256(UintToArith256(hashWriter.GetHash()) << 128 | tmpNonce));
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}
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void SetPOSTarget(uint32_t nBits)
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{
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CVerusHashWriter hashWriter = CVerusHashWriter(SER_GETHASH, PROTOCOL_VERSION);
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arith_uint256 arNonce = (UintToArith256(*this) & entropyMask) | nBits;
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hashWriter << ArithToUint256(arNonce);
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(uint256 &)(*this) = ArithToUint256(UintToArith256(hashWriter.GetHash()) << 128 | arNonce);
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}
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void SetPOSEntropy(const uint256 &pastHash, uint256 txid, int32_t voutNum);
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bool CheckPOSEntropy(const uint256 &pastHash, uint256 txid, int32_t voutNum);
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};
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#endif // BITCOIN_PRIMITIVES_NONCE_H
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