internal PSBTInput(BitcoinStream stream, PSBT parent, uint index, TxIn input) : base(parent)
{
TxIn = input;
Index = index;
originalScriptSig = TxIn.ScriptSig ?? Script.Empty;
originalWitScript = TxIn.WitScript ?? WitScript.Empty;
byte[] k = new byte[0];
byte[] v = new byte[0];
try
{
stream.ReadWriteAsVarString(ref k);
}
catch (EndOfStreamException e)
{
throw new FormatException("Invalid PSBTInput. Failed to Parse key.", e);
}
while (k.Length != 0)
{
try
{
stream.ReadWriteAsVarString(ref v);
}
catch (EndOfStreamException e)
{
throw new FormatException("Invalid PSBTInput. Failed to parse key.", e);
}
switch (k.First())
{
case PSBTConstants.PSBT_IN_NON_WITNESS_UTXO:
if (k.Length != 1)
{
throw new FormatException("Invalid PSBTInput. Contains illegal value in key for NonWitnessUTXO");
}
if (non_witness_utxo != null)
{
throw new FormatException("Invalid PSBTInput. Duplicate non_witness_utxo");
}
non_witness_utxo = this.GetConsensusFactory().CreateTransaction();
non_witness_utxo.FromBytes(v);
break;
case PSBTConstants.PSBT_IN_WITNESS_UTXO:
if (k.Length != 1)
{
throw new FormatException("Invalid PSBTInput. Contains illegal value in key for WitnessUTXO");
}
if (witness_utxo != null)
{
throw new FormatException("Invalid PSBTInput. Duplicate witness_utxo");
}
if (this.GetConsensusFactory().TryCreateNew <TxOut>(out var txout))
{
witness_utxo = txout;
}
else
{
witness_utxo = new TxOut();
}
witness_utxo.FromBytes(v);
break;
case PSBTConstants.PSBT_IN_PARTIAL_SIG:
var pubkey = new PubKey(k.Skip(1).ToArray());
if (partial_sigs.ContainsKey(pubkey))
{
throw new FormatException("Invalid PSBTInput. Duplicate key for partial_sigs");
}
partial_sigs.Add(pubkey, new TransactionSignature(v));
break;
case PSBTConstants.PSBT_IN_SIGHASH:
if (k.Length != 1)
{
throw new FormatException("Invalid PSBTInput. Contains illegal value in key for SigHash type");
}
if (!(sighash_type is null))
{
throw new FormatException("Invalid PSBTInput. Duplicate key for sighash_type");
}
if (v.Length != 4)
{
throw new FormatException("Invalid PSBTInput. SigHash Type is not 4 byte");
}
var value = Utils.ToUInt32(v, 0, true);
if (!Enum.IsDefined(typeof(SigHash), value))
{
throw new FormatException($"Invalid PSBTInput Unknown SigHash Type {value}");
}
sighash_type = (SigHash)value;
break;
case PSBTConstants.PSBT_IN_REDEEMSCRIPT:
if (k.Length != 1)
{
throw new FormatException("Invalid PSBTInput. Contains illegal value in key for redeem script");
}
if (redeem_script != null)
{
throw new FormatException("Invalid PSBTInput. Duplicate key for redeem_script");
}
redeem_script = Script.FromBytesUnsafe(v);
break;
case PSBTConstants.PSBT_IN_WITNESSSCRIPT:
if (k.Length != 1)
{
throw new FormatException("Invalid PSBTInput. Contains illegal value in key for witness script");
}
if (witness_script != null)
{
throw new FormatException("Invalid PSBTInput. Duplicate key for redeem_script");
}
witness_script = Script.FromBytesUnsafe(v);
break;
case PSBTConstants.PSBT_IN_BIP32_DERIVATION:
var pubkey2 = new PubKey(k.Skip(1).ToArray());
if (hd_keypaths.ContainsKey(pubkey2))
{
throw new FormatException("Invalid PSBTInput. Duplicate key for hd_keypaths");
}
var masterFingerPrint = new HDFingerprint(v.Take(4).ToArray());
KeyPath path = KeyPath.FromBytes(v.Skip(4).ToArray());
hd_keypaths.Add(pubkey2, new RootedKeyPath(masterFingerPrint, path));
break;
case PSBTConstants.PSBT_IN_SCRIPTSIG:
if (k.Length != 1)
{
throw new FormatException("Invalid PSBTInput. Contains illegal value in key for final scriptsig");
}
if (final_script_sig != null)
{
throw new FormatException("Invalid PSBTInput. Duplicate key for final_script_sig");
}
final_script_sig = Script.FromBytesUnsafe(v);
break;
case PSBTConstants.PSBT_IN_SCRIPTWITNESS:
if (k.Length != 1)
{
throw new FormatException("Invalid PSBTInput. Contains illegal value in key for final script witness");
}
if (final_script_witness != null)
{
throw new FormatException("Invalid PSBTInput. Duplicate key for final_script_witness");
}
final_script_witness = new WitScript(v);
break;
default:
if (unknown.ContainsKey(k))
{
throw new FormatException("Invalid PSBTInput. Duplicate key for unknown value");
}
unknown.Add(k, v);
break;
}
stream.ReadWriteAsVarString(ref k);
}
}
internal PSBTOutput(BitcoinStream stream, PSBT parent, uint index, TxOut txOut) : base(parent)
{
if (txOut == null)
{
throw new ArgumentNullException(nameof(txOut));
}
if (parent == null)
{
throw new ArgumentNullException(nameof(parent));
}
TxOut = txOut;
Index = index;
byte[] k = new byte[0];
byte[] v = new byte[0];
try
{
stream.ReadWriteAsVarString(ref k);
}
catch (EndOfStreamException e)
{
throw new FormatException("Invalid PSBTOutput. Could not read key", e);
}
while (k.Length != 0)
{
try
{
stream.ReadWriteAsVarString(ref v);
}
catch (EndOfStreamException e)
{
throw new FormatException("Invalid PSBTOutput. Could not read value", e);
}
switch (k.First())
{
case PSBTConstants.PSBT_OUT_REDEEMSCRIPT:
if (k.Length != 1)
{
throw new FormatException("Invalid PSBTOutput. Contains illegal value in key for redeem script");
}
if (redeem_script != null)
{
throw new FormatException("Invalid PSBTOutput, duplicate key for redeem_script");
}
redeem_script = Script.FromBytesUnsafe(v);
break;
case PSBTConstants.PSBT_OUT_WITNESSSCRIPT:
if (k.Length != 1)
{
throw new FormatException("Invalid PSBTOutput. Contains illegal value in key for witness script");
}
if (witness_script != null)
{
throw new FormatException("Invalid PSBTOutput, duplicate key for redeem_script");
}
witness_script = Script.FromBytesUnsafe(v);
break;
case PSBTConstants.PSBT_OUT_BIP32_DERIVATION:
var pubkey2 = new PubKey(k.Skip(1).ToArray());
if (hd_keypaths.ContainsKey(pubkey2))
{
throw new FormatException("Invalid PSBTOutput, duplicate key for hd_keypaths");
}
KeyPath path = KeyPath.FromBytes(v.Skip(4).ToArray());
hd_keypaths.Add(pubkey2, Tuple.Create(new HDFingerprint(v.Take(4).ToArray()), path));
break;
default:
if (unknown.ContainsKey(k))
{
throw new FormatException("Invalid PSBTInput, duplicate key for unknown value");
}
unknown.Add(k, v);
break;
}
stream.ReadWriteAsVarString(ref k);
}
}
internal PSBT(BitcoinStream stream, Network network)
{
Network = network;
Inputs = new PSBTInputList();
Outputs = new PSBTOutputList();
var magicBytes = stream.Inner.ReadBytes(PSBT_MAGIC_BYTES.Length);
if (!magicBytes.SequenceEqual(PSBT_MAGIC_BYTES))
{
throw new FormatException("Invalid PSBT magic bytes");
}
// It will be reassigned in `ReadWriteAsVarString` so no worry to assign 0 length array here.
byte[] k = new byte[0];
byte[] v = new byte[0];
var txFound = false;
stream.ReadWriteAsVarString(ref k);
while (k.Length != 0)
{
switch (k[0])
{
case PSBTConstants.PSBT_GLOBAL_UNSIGNED_TX:
if (k.Length != 1)
{
throw new FormatException("Invalid PSBT. Contains illegal value in key global tx");
}
if (tx != null)
{
throw new FormatException("Duplicate Key, unsigned tx already provided");
}
tx = stream.ConsensusFactory.CreateTransaction();
uint size = 0;
stream.ReadWriteAsVarInt(ref size);
var pos = stream.Counter.ReadenBytes;
tx.ReadWrite(stream);
if (stream.Counter.ReadenBytes - pos != size)
{
throw new FormatException("Malformed global tx. Unexpected size.");
}
if (tx.Inputs.Any(txin => txin.ScriptSig != Script.Empty || txin.WitScript != WitScript.Empty))
{
throw new FormatException("Malformed global tx. It should not contain any scriptsig or witness by itself");
}
txFound = true;
break;
case PSBTConstants.PSBT_GLOBAL_XPUB when XPubVersionBytes != null:
if (k.Length != 1 + XPubVersionBytes.Length + 74)
{
throw new FormatException("Malformed global xpub.");
}
for (int ii = 0; ii < XPubVersionBytes.Length; ii++)
{
if (k[1 + ii] != XPubVersionBytes[ii])
{
throw new FormatException("Malformed global xpub.");
}
}
stream.ReadWriteAsVarString(ref v);
KeyPath path = KeyPath.FromBytes(v.Skip(4).ToArray());
var rootedKeyPath = new RootedKeyPath(new HDFingerprint(v.Take(4).ToArray()), path);
GlobalXPubs.Add(new ExtPubKey(k, 1 + XPubVersionBytes.Length, 74).GetWif(Network), rootedKeyPath);
break;
default:
if (unknown.ContainsKey(k))
{
throw new FormatException("Invalid PSBTInput, duplicate key for unknown value");
}
stream.ReadWriteAsVarString(ref v);
unknown.Add(k, v);
break;
}
stream.ReadWriteAsVarString(ref k);
}
if (!txFound)
{
throw new FormatException("Invalid PSBT. No global TX");
}
int i = 0;
while (stream.Inner.CanRead && i < tx.Inputs.Count)
{
var psbtin = new PSBTInput(stream, this, (uint)i, tx.Inputs[i]);
Inputs.Add(psbtin);
i++;
}
if (i != tx.Inputs.Count)
{
throw new FormatException("Invalid PSBT. Number of input does not match to the global tx");
}
i = 0;
while (stream.Inner.CanRead && i < tx.Outputs.Count)
{
var psbtout = new PSBTOutput(stream, this, (uint)i, tx.Outputs[i]);
Outputs.Add(psbtout);
i++;
}
if (i != tx.Outputs.Count)
{
throw new FormatException("Invalid PSBT. Number of outputs does not match to the global tx");
}
}
internal PSBTOutput(BitcoinStream stream, PSBT parent, uint index, TxOut txOut) : base(parent)
{
if (txOut == null)
{
throw new ArgumentNullException(nameof(txOut));
}
if (parent == null)
{
throw new ArgumentNullException(nameof(parent));
}
TxOut = txOut;
Index = index;
byte[] k = new byte[0];
byte[] v = new byte[0];
try
{
stream.ReadWriteAsVarString(ref k);
}
catch (EndOfStreamException e)
{
throw new FormatException("Invalid PSBTOutput. Could not read key", e);
}
while (k.Length != 0)
{
try
{
stream.ReadWriteAsVarString(ref v);
}
catch (EndOfStreamException e)
{
throw new FormatException("Invalid PSBTOutput. Could not read value", e);
}
switch (k.First())
{
case PSBTConstants.PSBT_OUT_REDEEMSCRIPT:
if (k.Length != 1)
{
throw new FormatException("Invalid PSBTOutput. Contains illegal value in key for redeem script");
}
if (redeem_script != null)
{
throw new FormatException("Invalid PSBTOutput, duplicate key for redeem_script");
}
redeem_script = Script.FromBytesUnsafe(v);
break;
case PSBTConstants.PSBT_OUT_WITNESSSCRIPT:
if (k.Length != 1)
{
throw new FormatException("Invalid PSBTOutput. Unexpected key length for PSBT_OUT_BIP32_DERIVATION");
}
if (witness_script != null)
{
throw new FormatException("Invalid PSBTOutput, duplicate key for redeem_script");
}
witness_script = Script.FromBytesUnsafe(v);
break;
case PSBTConstants.PSBT_OUT_BIP32_DERIVATION:
var pubkey2 = new PubKey(k.Skip(1).ToArray());
if (hd_keypaths.ContainsKey(pubkey2))
{
throw new FormatException("Invalid PSBTOutput, duplicate key for hd_keypaths");
}
KeyPath path = KeyPath.FromBytes(v.Skip(4).ToArray());
hd_keypaths.Add(pubkey2, new RootedKeyPath(new HDFingerprint(v.Take(4).ToArray()), path));
break;
case PSBTConstants.PSBT_OUT_TAP_BIP32_DERIVATION:
var pubkey3 = new TaprootPubKey(k.Skip(1).ToArray());
if (hd_taprootkeypaths.ContainsKey(pubkey3))
{
throw new FormatException("Invalid PSBTOutput, duplicate key for hd_taproot_keypaths");
}
var bs = new BitcoinStream(v);
List <uint256> hashes = null !;
bs.ReadWrite(ref hashes);
var pos = (int)bs.Inner.Position;
KeyPath path2 = KeyPath.FromBytes(v.Skip(pos + 4).ToArray());
hd_taprootkeypaths.Add(pubkey3,
new TaprootKeyPath(
new RootedKeyPath(new HDFingerprint(v.Skip(pos).Take(4).ToArray()), path2),
hashes.ToArray()));
break;
case PSBTConstants.PSBT_OUT_TAP_INTERNAL_KEY:
if (k.Length != 1)
{
throw new FormatException("Invalid PSBTOutput. Contains illegal value in key for internal taproot pubkey");
}
if (!TaprootInternalPubKey.TryCreate(v, out var tpk))
{
throw new FormatException("Invalid PSBTOutput. Contains invalid internal taproot pubkey");
}
TaprootInternalKey = tpk;
break;
default:
if (unknown.ContainsKey(k))
{
throw new FormatException("Invalid PSBTInput, duplicate key for unknown value");
}
unknown.Add(k, v);
break;
}
stream.ReadWriteAsVarString(ref k);
}
}
