private void WriteBlock(string filename, string data, string owner, string prevHash, int BlockIndex) // (Physical) Write Block to Blockchain
{
if (prevHash == null)
{
prevHash = "0000000000000000000000000000000000000000000000000000000000000000"; // Genesis Hash
}
FileStream fs = File.Open(filename, FileMode.Append);
int time = (int)(DateTime.Now.ToUniversalTime() - new DateTime(1970, 1, 1)).TotalSeconds;
string HashPrep = Convert.ToString(time) + prevHash + Convert.ToString(data.Length) + data + Convert.ToString(owner.Length) + owner;
SHA256 sha = SHA256.Create();
sha.ComputeHash(Encoding.UTF8.GetBytes(HashPrep));
string HashVal = SharpChainUtils.HashByteArray(sha.Hash);
sha = SHA256.Create();
sha.ComputeHash(Encoding.UTF8.GetBytes(SHA256_Master + HashVal));
string MasterHashVal = SharpChainUtils.HashByteArray(sha.Hash);
int bytesDataLength = BitConverter.GetBytes(data.Length).Length;
int bytesOwnerDataLength = BitConverter.GetBytes(owner.Length).Length;
SharpChainBlock block = new SharpChainBlock(time, MasterHashVal, prevHash, data, fs.Name);
SharpChainIndex.UpdateIndex(fs.Name, block, (int)fs.Length, bytesDataLength + data.Length + 139 + bytesOwnerDataLength + owner.Length);
// Write to SharpChain
fs.Write(BitConverter.GetBytes(this.Magic), 0, 3); // Byte: 0
fs.Write(BitConverter.GetBytes(BlockIndex), 0, 1); // Byte: 0
fs.Write(BitConverter.GetBytes('\x01'), 0, 1); // Byte: 4
fs.Write(BitConverter.GetBytes(time), 0, 4); //Byte: 5
fs.Write(BitConverter.GetBytes(data.Length), 0, bytesDataLength); // Byte: 10
fs.Write(Encoding.ASCII.GetBytes(data), 0, data.Length); // Byte: 13 + data.Length
fs.Write(Encoding.ASCII.GetBytes(prevHash), 0, 64); // Byte: 13 + data.Length + 64
fs.Write(Encoding.ASCII.GetBytes(MasterHashVal), 0, 64); // Byte: 13 + data.Length + 128
fs.Write(BitConverter.GetBytes(owner.Length), 0, bytesOwnerDataLength); // Byte: 10
fs.Write(Encoding.ASCII.GetBytes(owner), 0, owner.Length); // Byte: 13 + data.Length
fs.Write(BitConverter.GetBytes('\0'), 0, 1); // Byte: 13 + data.Length + 128 + 1 (END OF BLOCK!)
fs.Flush();
fs.Close();
}
public SharpChainBlock AddBlock(string data, string Owner = null, Dictionary <string, string> dict = null) // Add Block to Blockchain
{
if (dict == null)
{
dict = new Dictionary <string, string>();
}
bool exists = File.Exists(this.Database);
SharpChainBlock lastBlock = null;
dict.Add("Data", data);
dict.Add("GUID", Owner != null ? Owner : this.ID);
string jsonData = JsonConvert.SerializeObject(dict); // Convert data to JSON
try
{
if (!exists)
{
// Write Genesis Block
WriteBlock(this.Database, jsonData, Owner, "0000000000000000000000000000000000000000000000000000000000000000", 0);
}
else
{
// Read Last Block
lastBlock = GetLastBlock(this, true);
// Write A Block
string h = lastBlock != null ? lastBlock.Hash.Value : null;
WriteBlock(this.Database, jsonData, Owner, h, 0);
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
return(null);
}
return(lastBlock); // Return the last block
}
public static SharpChainIndex UpdateIndex(string filename, SharpChainBlock block, int index, int length) // Update the Index File
{
if (index == 0)
{
index -= 1; // Start at -1
}
FileStream fs = File.Open(filename + SharpChain.DatabaseIndexFormat, FileMode.Append); // Open Index File
string bindex = Convert.ToString(index + 1);
string blength = Convert.ToString(length);
fs.Write(Encoding.ASCII.GetBytes(block.Hash.Value), 0, block.Hash.Length);
fs.Write(Encoding.ASCII.GetBytes(":"), 0, 1);
fs.Write(Encoding.ASCII.GetBytes(bindex), 0, bindex.Length);
fs.Write(Encoding.ASCII.GetBytes(":"), 0, 1);
fs.Write(Encoding.ASCII.GetBytes(blength), 0, blength.Length);
fs.Write(Encoding.ASCII.GetBytes("~"), 0, 1);
fs.Flush();
fs.Close();
return(new SharpChainIndex(index + 1, length, block.Hash.Value)); // Return the Index
}
public List <SharpChainBlock> ReadBlocks(bool checkConsistency = true, bool CopyEx = false, int start = 0, int length = 0, bool SanityCheck = false) // Read Blocks in the Blockchain
{
string filename = this.Database;
List <SharpChainBlock> blocks = new List <SharpChainBlock>();
if (!File.Exists(this.Database))
{
return(blocks);
}
string consist_prev_hash = "0000000000000000000000000000000000000000000000000000000000000000"; // Genesis hash, 64 0's
var newFile = filename;
if (CopyEx)
{
newFile = filename + "-copy-" + Guid.NewGuid().ToString();
File.Copy(filename, newFile);
}
using (FileStream fs = File.Open(newFile, FileMode.Open))
{
if (fs != null)
{
byte[] testarr = new byte[(int)fs.Length];
int posOffset = 0;
UInt32 _magic;
int count = 0;
int _dataLen = 0;
int _time = 0;
int _olength = 0;
string _dataS = "";
string _owner = "";
string _PrevHash = "";
string _BlockHash = "";
byte[] hash_gen = new byte[99999];
fs.Read(testarr, 0, (int)fs.Length);
var len = testarr.Length;
var max = start > 0 ? length + start : len;
for (int i = 0; i < testarr.Length; i++)
{
if (i >= start && i <= max)
{
hash_gen[i] = testarr[i];
int testtt = (i + _dataLen) - posOffset;
if (i - posOffset == 0) // MAGIC
{
_magic = BitConverter.ToUInt32(testarr, i);
}
else if (i - posOffset == 1 && i != 1)
{
_magic = BitConverter.ToUInt32(testarr, i);
}
else if (i - posOffset == 5)
{
_time = BitConverter.ToInt32(testarr, i);
}
else if (i - posOffset == 9) // Data Length
{
_dataLen = BitConverter.ToInt32(testarr, i);
}
else if (i - posOffset >= 13 && i - posOffset < (13 + _dataLen))
{
_dataS += System.Text.Encoding.UTF8.GetString(new[] { testarr[i] });
}
else if (i - posOffset > (13 + _dataLen) - 1 && i - posOffset < ((13 + _dataLen) + 64)) // Previous Hash
{
_PrevHash += System.Text.Encoding.UTF8.GetString(new[] { testarr[i] });
}
else if (i - posOffset > ((13 + _dataLen) + 64) - 1 && i - posOffset < (((13 + _dataLen) + 64) + 64)) //Block Hash
{
_BlockHash += System.Text.Encoding.UTF8.GetString(new[] { testarr[i] });
}
else if (i - posOffset > (((13 + _dataLen) + 64) + 64) - 1 && i - posOffset < (((13 + _dataLen) + 64) + 64) + 1) //Block Hash
{
_olength = testarr[i];
}
else if (i - posOffset > (((13 + _dataLen) + 64) + 64) + 3 && i - posOffset < (((13 + _dataLen) + 64) + 64) + 3 + _olength + 1)
{
_owner += System.Text.Encoding.UTF8.GetString(new[] { testarr[i] });
}
else if (i - posOffset > (((13 + _dataLen) + 64) + 64) + 3 + _olength + 1 || i >= fs.Length - 1)
{
count++;
posOffset = i;
// Check validation
// Compute SharpChain Hash
string currentHash = SharpChainHash.ComputeHash(_time, _PrevHash, _dataS, _owner, SHA256_Master);
bool Inconsistent = false;
if (currentHash != _BlockHash && i != 0 && checkConsistency)
{
Console.WriteLine("Found inconsistency with data!...");
Console.WriteLine("Found " + currentHash + " but expected " + _BlockHash);
Console.WriteLine("*********************");
Console.WriteLine("INCONSISTENT @ BLOCK " + Convert.ToString(count - 1));
Console.WriteLine("DATA '" + _dataS + "' is unreliable!");
Console.WriteLine("*********************");
Console.WriteLine("Chain has been broken! ");
Console.WriteLine("");
Console.WriteLine("");
Console.WriteLine("");
Inconsistent = true;
if (SanityCheck)
{
return(null);
}
}
if (consist_prev_hash != _PrevHash && i != 0 && checkConsistency)
{
Console.WriteLine("Found inconsistency with data!...");
Console.WriteLine("Found " + _PrevHash + " but expected " + consist_prev_hash);
Console.WriteLine("*********************");
Console.WriteLine("INCONSISTENT @ BLOCK " + Convert.ToString(count - 1));
Console.WriteLine("DATA '" + _dataS + "' is unreliable!");
Console.WriteLine("*********************");
Console.WriteLine("Chain has been broken! ");
Console.WriteLine("");
Console.WriteLine("");
Console.WriteLine("");
Inconsistent = true;
consist_prev_hash = _PrevHash;
if (SanityCheck)
{
return(null);
}
}
else
{
consist_prev_hash = currentHash;
}
if (Inconsistent == false && checkConsistency)
{
Console.WriteLine("Found expected Hash " + consist_prev_hash);
Console.WriteLine("*********************");
Console.WriteLine("CONSISTENT @ BLOCK " + Convert.ToString(count - 1));
Console.WriteLine("DATA '" + _dataS + "' is reliable!");
Console.WriteLine("*********************");
Console.WriteLine("Chain has not yet been broken! ");
Console.WriteLine("");
Console.WriteLine("");
Console.WriteLine("");
}
SharpChainBlock block = new SharpChainBlock(_time, currentHash, _PrevHash, _dataS, filename, _owner, Inconsistent, SharpChainIndex.IndexOf(this, currentHash, true));
block.Height = count - 1;
blocks.Add(block);
_dataLen = 0;
_dataS = null;
_PrevHash = null;
_BlockHash = null;
_owner = null;
_olength = 0;
if (i >= fs.Length - 1)
{
break;
}
}
}
else
{
posOffset = i;
}
}
fs.Flush();
fs.Close();
}
else
{
Console.WriteLine("Could not open SharpChain file!");
}
}
if (checkConsistency)
{
if (blocks.Count > 0)
{
if (blocks[blocks.Count - 1].Inconsistent == false)
{
Console.WriteLine("Found no inconsistencies!");
}
}
}
if (CopyEx)
{
if (File.Exists(newFile))
{
File.Delete(newFile);
}
}
return(blocks);
}
