uint256 Tx::createHash() const
{
CHash256 ctx;
ctx.Write((const unsigned char*) m_data.begin(), m_data.size());
uint256 result;
ctx.Finalize((unsigned char*)&result);
return result;
}
// SYSCOIN generate block
// This will figure out a valid hash and Nonce if you're
// creating a different genesis block:
static bool GenerateGenesisBlock(CBlockHeader &genesisBlock, uint256 *phash)
{
// Write the first 76 bytes of the block header to a double-SHA256 state.
genesisBlock.nTime = time(NULL);
CHash256 hasher;
CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
ss << genesisBlock;
assert(ss.size() == 80);
hasher.Write((unsigned char*)&ss[0], 76);
arith_uint256 hashTarget = arith_uint256().SetCompact(genesisBlock.nBits);
while (true) {
// Write the last 4 bytes of the block header (the nonce) to a copy of
// the double-SHA256 state, and compute the result.
CHash256(hasher).Write((unsigned char*)&genesisBlock.nNonce, 4).Finalize((unsigned char*)phash);
// Return the nonce if the hash has at least some zero bits,
// check if it has enough to reach the target
if (((uint16_t*)phash)[15] == 0 && UintToArith256(*phash) <= hashTarget)
break;
genesisBlock.nNonce++;
if (genesisBlock.nNonce == 0) {
printf("NONCE WRAPPED, incrementing time\n");
++genesisBlock.nTime;
}
// If nothing found after trying for a while, return -1
if ((genesisBlock.nNonce & 0xfff) == 0)
printf("nonce %08X: hash = %s (target = %s)\n",
genesisBlock.nNonce, (*phash).ToString().c_str(),
hashTarget.ToString().c_str());
}
printf("genesis.nTime = %u \n", genesisBlock.nTime);
printf("genesis.nNonce = %u \n", genesisBlock.nNonce);
printf("Generate hash = %s\n", (*phash).ToString().c_str());
printf("genesis.hashMerkleRoot = %s\n", genesisBlock.hashMerkleRoot.ToString().c_str());
}
