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Use arith_uint256 where necessary

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Also add conversion from/to uint256 where needed.
This commit is contained in:
Wladimir J. van der Laan
2014-12-16 15:43:03 +01:00
parent 34cdc41128
commit 734f85c4f0
11 changed files with 44 additions and 33 deletions
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15
src/pow.cpp
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@ -5,6 +5,7 @@
#include "pow.h"
#include "arith_uint256.h"
#include "chain.h"
#include "chainparams.h"
#include "primitives/block.h"
@ -56,8 +57,8 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
nActualTimespan = Params().TargetTimespan()*4;
// Retarget
uint256 bnNew;
uint256 bnOld;
arith_uint256 bnNew;
arith_uint256 bnOld;
bnNew.SetCompact(pindexLast->nBits);
bnOld = bnNew;
bnNew *= nActualTimespan;
@ -79,7 +80,7 @@ bool CheckProofOfWork(uint256 hash, unsigned int nBits)
{
bool fNegative;
bool fOverflow;
uint256 bnTarget;
arith_uint256 bnTarget;
if (Params().SkipProofOfWorkCheck())
return true;
@ -91,22 +92,22 @@ bool CheckProofOfWork(uint256 hash, unsigned int nBits)
return error("CheckProofOfWork() : nBits below minimum work");
// Check proof of work matches claimed amount
if (hash > bnTarget)
if (UintToArith256(hash) > bnTarget)
return error("CheckProofOfWork() : hash doesn't match nBits");
return true;
}
uint256 GetBlockProof(const CBlockIndex& block)
arith_uint256 GetBlockProof(const CBlockIndex& block)
{
uint256 bnTarget;
arith_uint256 bnTarget;
bool fNegative;
bool fOverflow;
bnTarget.SetCompact(block.nBits, &fNegative, &fOverflow);
if (fNegative || fOverflow || bnTarget == 0)
return 0;
// We need to compute 2**256 / (bnTarget+1), but we can't represent 2**256
// as it's too large for a uint256. However, as 2**256 is at least as large
// as it's too large for a arith_uint256. However, as 2**256 is at least as large
// as bnTarget+1, it is equal to ((2**256 - bnTarget - 1) / (bnTarget+1)) + 1,
// or ~bnTarget / (nTarget+1) + 1.
return (~bnTarget / (bnTarget + 1)) + 1;