public static Block ComputeBlock(Transaction transaction)
{
CurrentBlockchain = DataManager.UploadBlockchainDictionary();
var check = true;
var previousNonce = CurrentBlockchain.Values.Last().Nonce;
var nonce = FindHash(previousNonce + 1);
while (check)
{
if (!CurrentBlockchain.ContainsKey(HexConvert.FromBytes(Hash.ComputeSha256FromString(nonce.ToString()))))
{
check = false;
}
else
{
nonce = FindHash(nonce + 1);
}
}
var newBlock = new Block()
{
Id = CurrentBlockchain.Values.Last().Id + 1,
Hash = Hash.ComputeSha256FromString(nonce.ToString()),
PreviousHash = HexConvert.ToBytes(CurrentBlockchain.Keys.Last()),
Nonce = nonce,
Timestamp = DateTime.Now,
Transaction = transaction
};
return(newBlock);
}
public static int GetCash(Dictionary <string, Block> data, byte[] publicKey)
{
var currentKey = data.Last().Key;
var cash = 0;
while (!data[currentKey].PreviousHash.SequenceEqual(data[currentKey].Hash))
{
cash += data[currentKey].Transaction.OutEntries
.Where(outEntry => outEntry.RecipientHash.SequenceEqual(publicKey))
.Sum(outEntry => (int)outEntry.Value);
if (EntryConsistPub(data[currentKey].Transaction.InEntries, publicKey))
{
return(cash);
}
if (data[currentKey].Id == 0)
{
return((from outEntry in data[currentKey].Transaction.OutEntries
where outEntry.RecipientHash.SequenceEqual(publicKey)
select(int) outEntry.Value).FirstOrDefault());
}
currentKey = HexConvert.FromBytes(data[currentKey].PreviousHash);
}
return(0);
}
/// <summary>
/// Генерация генезис блока
/// </summary>
public static Dictionary <string, Block> GenerateBlockchainGenesis(KeyPair keyPair)
{
var outEntry = new OutEntry()
{
RecipientHash = keyPair.PublicKey,
Value = 100
};
var genesisBlock = new Block()
{
Id = 0,
Hash = genesisHash,
Nonce = 0,
PreviousHash = null,
Timestamp = DateTime.Now,
Transaction = new Transaction()
{
Id = 0,
Signature = EccService.Sign(genesisHash, keyPair.PrivateKey, keyPair.PublicKey),
Timestamp = DateTime.Now,
InEntries = null,
OutEntries = new List <OutEntry>()
{
outEntry
}
}
};
var blockchain = new Dictionary <string, Block>()
{
{ HexConvert.FromBytes(genesisHash), genesisBlock }
};
return(blockchain);
}
/// <summary>
/// Поиск хэша
/// </summary>
private static int FindHash(int nonce)
{
for (int i = nonce; i < 100000000; i++)
{
var dataHash = Hash.ComputeSha256FromString(i.ToString());
var dataHashStr = HexConvert.FromBytes(dataHash);
if (dataHashStr[dataHashStr.Length - 2].Equals('0'))
{
return(i);
}
}
return(-1);
}
public static int GetCashRec(Dictionary <string, Block> data, byte[] publicKey, string current)
{
if (EntryConsistPub(data[current].Transaction.InEntries, publicKey))
{
return(GetCashOut(data[current].Transaction.OutEntries, publicKey));
}
if (ConsistOutWithoutEntry(data[current].Transaction, publicKey))
{
return(GetCashOut(data[current].Transaction.OutEntries, publicKey) +
GetCashRec(data, publicKey, HexConvert.FromBytes(data[current].PreviousHash)));
}
return(GetCashRec(data, publicKey, HexConvert.FromBytes(data[current].PreviousHash)));
}