internal HDKeyManager(ExtPubKey extPubKey, KeyPath accountKeyPath, uint minGapLimit = AbsoluteMinGapLimit)
{
AccountKeyPath = accountKeyPath ?? DefaultAccountKeyPath;
MinGapLimit = minGapLimit;
ExtPubKey = extPubKey;
ExternalKeys = new KeysRegistry(extPubKey.Derive(0), AccountKeyPath.Derive(0), MinGapLimit);
InternalKeys = new KeysRegistry(extPubKey.Derive(1), AccountKeyPath.Derive(1), MinGapLimit);
}
private HDPubKey DerivePubKeyFromIndex(int index, string knownBy)
{
var path = new KeyPath((uint)index);
var fullPath = AccountKeyPath.Derive((uint)index);
var pubKey = ExtPubKey.Derive(path).PubKey;
var hdPubKey = new HDPubKey(pubKey, fullPath, knownBy);
return(hdPubKey);
}
public HdPubKey GenerateNewKey(SmartLabel label, KeyState keyState, bool isInternal, bool toFile = true)
{
// BIP44-ish derivation scheme
// m / purpose' / coin_type' / account' / change / address_index
var change = isInternal ? 1 : 0;
lock (HdPubKeysLock)
{
HdPubKey[] relevantHdPubKeys = HdPubKeys.Where(x => x.IsInternal == isInternal).ToArray();
KeyPath path = new KeyPath($"{change}/0");
if (relevantHdPubKeys.Any())
{
int largestIndex = relevantHdPubKeys.Max(x => x.Index);
var smallestMissingIndex = largestIndex;
var present = new bool[largestIndex + 1];
for (int i = 0; i < relevantHdPubKeys.Length; ++i)
{
present[relevantHdPubKeys[i].Index] = true;
}
for (int i = 1; i < present.Length; ++i)
{
if (!present[i])
{
smallestMissingIndex = i - 1;
break;
}
}
path = relevantHdPubKeys[smallestMissingIndex].NonHardenedKeyPath.Increment();
}
var fullPath = AccountKeyPath.Derive(path);
var pubKey = ExtPubKey.Derive(path).PubKey;
var hdPubKey = new HdPubKey(pubKey, fullPath, label, keyState);
HdPubKeys.Add(hdPubKey);
lock (HdPubKeyScriptBytesLock)
{
HdPubKeyScriptBytes.Add(hdPubKey.P2wpkhScript.ToCompressedBytes());
}
lock (ScriptHdPubKeyMapLock)
{
ScriptHdPubKeyMap.Add(hdPubKey.P2wpkhScript, hdPubKey);
}
if (toFile)
{
ToFile();
}
return(hdPubKey);
}
}
public HdPubKey GenerateNewKey(string label, KeyState keyState, bool isInternal, bool toFile = true)
{
// BIP44-ish derivation scheme
// m / purpose' / coin_type' / account' / change / address_index
var change = isInternal ? 1 : 0;
lock (HdPubKeysLock)
{
IEnumerable <HdPubKey> relevantHdPubKeys = isInternal ? HdPubKeys.Where(x => x.IsInternal) : HdPubKeys.Where(x => !x.IsInternal);
KeyPath path;
if (relevantHdPubKeys.Any())
{
int largestIndex = relevantHdPubKeys.Max(x => x.Index);
List <int> missingIndexes = Enumerable.Range(0, largestIndex).Except(relevantHdPubKeys.Select(x => x.Index)).ToList();
if (missingIndexes.Any())
{
int smallestMissingIndex = missingIndexes.Min();
path = relevantHdPubKeys.First(x => x.Index == (smallestMissingIndex - 1)).NonHardenedKeyPath.Increment();
}
else
{
path = relevantHdPubKeys.First(x => x.Index == largestIndex).NonHardenedKeyPath.Increment();
}
}
else
{
path = new KeyPath($"{change}/0");
}
var fullPath = AccountKeyPath.Derive(path);
var pubKey = ExtPubKey.Derive(path).PubKey;
var hdPubKey = new HdPubKey(pubKey, fullPath, label, keyState);
HdPubKeys.Add(hdPubKey);
lock (HdPubKeyScriptBytesLock)
{
HdPubKeyScriptBytes.Add(hdPubKey.P2wpkhScript.ToCompressedBytes());
}
lock (ScriptHdPubKeyMapLock)
{
ScriptHdPubKeyMap.Add(hdPubKey.P2wpkhScript, hdPubKey);
}
if (toFile)
{
ToFile();
}
return(hdPubKey);
}
}