/// <summary>
/// Generate a mnemonic
/// </summary>
/// <param name="wordList"></param>
/// <param name="entropy"></param>
public Mnemonic(Wordlist wordList, byte[] entropy = null)
{
wordList = wordList ?? Wordlist.English;
_WordList = wordList;
if(entropy == null)
entropy = RandomUtils.GetBytes(32);
var i = Array.IndexOf(entArray, entropy.Length * 8);
if(i == -1)
throw new ArgumentException("The length for entropy should be : " + String.Join(",", entArray), "entropy");
int cs = csArray[i];
byte[] checksum = Hashes.SHA256(entropy);
BitWriter entcsResult = new BitWriter();
entcsResult.Write(entropy);
entcsResult.Write(checksum, cs);
_Indices = entcsResult.ToIntegers();
_Words = _WordList.GetWords(_Indices);
_Mnemonic = _WordList.GetSentence(_Indices);
}
// serialization implementation
#region IBitcoinSerializable Members
public void ReadWrite(BitcoinStream stream)
{
stream.ReadWrite(ref _TransactionCount);
stream.ReadWrite(ref _Hashes);
byte[] vBytes = null;
if(!stream.Serializing)
{
stream.ReadWriteAsVarString(ref vBytes);
BitWriter writer = new BitWriter();
for(int p = 0 ; p < vBytes.Length * 8 ; p++)
writer.Write((vBytes[p / 8] & (1 << (p % 8))) != 0);
_Flags = writer.ToBitArray();
}
else
{
vBytes = new byte[(_Flags.Length + 7) / 8];
for(int p = 0 ; p < _Flags.Length ; p++)
vBytes[p / 8] |= (byte)(ToByte(_Flags.Get(p)) << (p % 8));
stream.ReadWriteAsVarString(ref vBytes);
}
}
public BitWriter ToWriter()
{
var writer = new BitWriter();
writer.Write(array);
return writer;
}
public BitReader(byte[] data, int bitCount)
{
BitWriter writer = new BitWriter();
writer.Write(data, bitCount);
array = writer.ToBitArray();
}
public PartialMerkleTree(uint256[] vTxid, bool[] vMatch)
{
if(vMatch.Length != vTxid.Length)
throw new ArgumentException("The size of the array of txid and matches is different");
TransactionCount = (uint)vTxid.Length;
MerkleNode root = MerkleNode.GetRoot(vTxid);
BitWriter flags = new BitWriter();
MarkNodes(root, vMatch);
BuildCore(root, flags);
Flags = flags.ToBitArray();
}
/// <summary>
/// Remove superflous branches
/// </summary>
/// <param name="transaction"></param>
/// <returns></returns>
public PartialMerkleTree Trim(params uint256[] matchedTransactions)
{
PartialMerkleTree trimmed = new PartialMerkleTree();
trimmed.TransactionCount = TransactionCount;
var root = GetMerkleRoot();
foreach(var leaf in root.GetLeafs())
{
MarkToTop(leaf, false);
}
BitWriter flags = new BitWriter();
foreach(var leaf in root.GetLeafs().Where(l => matchedTransactions.Contains(l.Hash)))
{
MarkToTop(leaf, true);
}
trimmed.BuildCore(root, flags);
trimmed.Flags = flags.ToBitArray();
return trimmed;
}
private void BuildCore(MerkleNode node, BitWriter flags)
{
if(node == null)
return;
flags.Write(node.IsMarked);
if(node.IsLeaf || !node.IsMarked)
Hashes.Add(node.Hash);
if(node.IsMarked)
{
BuildCore(node.Left, flags);
BuildCore(node.Right, flags);
}
}