public static StealthMetadata CreateMetadata(Key ephemKey, BitField bitField = null)
{
for(uint nonce = 0 ; nonce < uint.MaxValue ; nonce++)
{
var metadata = new StealthMetadata(ephemKey, nonce);
if(bitField == null || bitField.Match(metadata.BitField))
return metadata;
}
throw new ArgumentException("No nonce can satisfy the given bitfield, use another ephemKey");
}
public StealthPayment(BitcoinStealthAddress address, Key ephemKey, StealthMetadata metadata)
{
Metadata = metadata;
ScriptPubKey = CreatePaymentScript(address.SignatureCount, address.SpendPubKeys, ephemKey, address.ScanPubKey);
if(address.SignatureCount > 1)
{
Redeem = ScriptPubKey;
ScriptPubKey = ScriptPubKey.Hash.ScriptPubKey;
}
SetStealthKeys();
}
private static bool Fill(StealthMetadata output, Script metadata)
{
var datas = _Template.ExtractScriptPubKeyParameters(metadata);
if(datas == null)
return false;
foreach(var data in datas)
{
if(Fill(output, metadata, data))
return true;
}
return false;
}
public static StealthMetadata TryParse(Script metadata)
{
StealthMetadata result = new StealthMetadata();
try
{
if(!Fill(result, metadata))
return null;
}
catch(Exception)
{
return null;
}
return result;
}
private static bool Fill(StealthMetadata output, Script metadata, byte[] data)
{
if(data == null || data.Length != 1 + 4 + 33)
return false;
MemoryStream ms = new MemoryStream(data);
output.Version = ms.ReadByte();
if(output.Version != 6)
return false;
output.Nonce = ms.ReadBytes(4);
output.EphemKey = new PubKey(ms.ReadBytes(33));
output.Script = metadata;
output.Hash = Hashes.Hash256(data);
var msprefix = new MemoryStream(output.Hash.ToBytes(false));
output.BitField = Utils.ToUInt32(msprefix.ReadBytes(4), true);
return true;
}
private static bool Fill(StealthMetadata output, Script metadata)
{
var ops = metadata.ToOps().ToArray();
if(ops.Length != 2 || ops[0].Code != OpcodeType.OP_RETURN)
return false;
var data = ops[1].PushData;
if(data == null || data.Length != 1 + 4 + 33)
return false;
MemoryStream ms = new MemoryStream(data);
output.Version = ms.ReadByte();
if(output.Version != 6)
return false;
output.Nonce = ms.ReadBytes(4);
output.EphemKey = new PubKey(ms.ReadBytes(33));
output.Script = metadata;
output.Hash = Hashes.Hash256(data);
var msprefix = new MemoryStream(output.Hash.ToBytes(false));
output.BitField = Utils.ToUInt32(msprefix.ReadBytes(4), true);
return true;
}
private static bool Fill(StealthMetadata output, Script metadata, byte[] data)
{
if (data == null || data.Length != 1 + 4 + 33)
{
return(false);
}
MemoryStream ms = new MemoryStream(data);
output.Version = ms.ReadByte();
if (output.Version != 6)
{
return(false);
}
output.Nonce = ms.ReadBytes(4);
output.EphemKey = new PubKey(ms.ReadBytes(33));
output.Script = metadata;
output.Hash = Hashes.Hash256(data);
var msprefix = new MemoryStream(output.Hash.ToBytes(false));
output.BitField = Utils.ToUInt32(msprefix.ReadBytes(4), true);
return(true);
}
public StealthPayment(Script scriptPubKey, Script redeem, StealthMetadata metadata)
{
Metadata = metadata;
ScriptPubKey = scriptPubKey;
Redeem = redeem;
SetStealthKeys();
}
public bool Match(StealthMetadata metadata)
{
if(metadata == null)
throw new ArgumentNullException("metadata");
return Match(metadata.BitField);
}
public bool Match(StealthMetadata metadata)
{
return(Match(metadata.BitField));
}
