public bool IsValidChain(string prevBlockHash, bool verbose)
{
bool isValid = true;
BuildMerkleTree();
string newBlockHash = HashFun.GetSha256(Nonce + CalculateBlockHash(prevBlockHash));
bool validSignature = KeyStore.VerifyBlock(newBlockHash, BlockSignature);
if (newBlockHash != BlockHash)
{
isValid = false;
}
else
{
isValid |= PreviousBlockHash == prevBlockHash;
}
PrintVerificationMessage(verbose, isValid, validSignature);
if (NextBlock != null)
{
return(NextBlock.IsValidChain(newBlockHash, true));
}
return(isValid);
}
static void RunWithTransactionPool()
{
var txn5 = SetupTransactions();
IKeyStore keyStore = new KeyStore(HashFun.Generate256BitKey());
IMBlock block1 = new MBlock(0, keyStore);
IMBlock block2 = new MBlock(1, keyStore);
IMBlock block3 = new MBlock(2, keyStore);
IMBlock block4 = new MBlock(3, keyStore);
AddTransactionsToBlocksAndCalculateHashes(block1, block2, block3, block4);
MBlockChain chain = new MBlockChain();
chain.AcceptBlock(block1);
chain.AcceptBlock(block2);
chain.AcceptBlock(block3);
chain.AcceptBlock(block4);
chain.VerifyChain();
Console.WriteLine("");
Console.WriteLine("");
txn5.ClaimNumber = "weqwewe";
chain.VerifyChain();
Console.WriteLine();
}
public string CalculateBlockHash(string previousBlockHash)
{
string txnHash = ClaimNumber + SettlementAmount + SettlementDate + CarRegistration + Mileage + ClaimType;
string blockHeader = BlockNumber + CreatedDate.ToString() + previousBlockHash;
string combined = txnHash + blockHeader;
return(HashFun.GetSha256(combined));
}
public string CalculateBlockHash(string previousBlockHash)
{
string blockheader = BlockNumber + CreatedDate.ToString() + previousBlockHash;
string combined = merkleTree.RootNode + blockheader;
if (KeyStore == null)
{
return(HashFun.GetSha256(combined));
}
else
{
return(HashFun.GetHMACHash(combined, KeyStore.AuthenticatedHashKey));
}
}
private static unsafe byte[] GetHash(HashFun fun, byte[] input)
{
var output = new byte[64];
fixed(byte *inBuf = input)
{
fixed(byte *outBuf = output)
{
fun(inBuf, outBuf, input.Length);
for (int i = 0; i < output.Length; i++)
{
output[i] = outBuf[i];
}
}
}
return(output);
}
public string CalculateTransactionHash()
{
string txnHash = ClaimNumber + SettlementAmount + SettlementDate + CarRegistration + Mileage + ClaimType;
return(HashFun.GetSha256(txnHash));
}
public bool VerifyBlock(string blockHash, string signature)
{
return(HashFun.VerifySignature(blockHash, signature, Certificate.PublicKey));
}
public string SignBlock(string blockHash)
{
return(HashFun.SignData(blockHash, Certificate.PrivateKey));
}
public KeyStore(byte[] authenticatedhashKey)
{
AuthenticatedHashKey = authenticatedhashKey;
Certificate = HashFun.AssignNewKey();
}
