public BlindingFactor Blind_sum(BlindSum blindSum)
{
var posKeys = blindSum.PositiveKeyIds.Select(Derived_key).ToList();
var negKeys = blindSum.NegativeKeyIds.Select(Derived_key).ToList();
posKeys.AddRange(blindSum.PositiveBlindingFactors.Select(pbf => pbf.Key));
negKeys.AddRange(blindSum.NegativeBlindingFactors.Select(nbf => nbf.Key));
var blinding = Secp.blind_sum(posKeys.ToArray(), negKeys.ToArray());
return(BlindingFactor.New(blinding));
}
/// Builds a new transaction by combining all the combinators provided in a
/// Vector. Transactions can either be built "from scratch" with a list of
/// inputs or outputs or from a pre-existing transaction that gets added to.
///
/// Example:
/// let (tx1, sum) = build::transaction(vec![input_rand(4), output_rand(1),
/// with_fee(1)], keychain).unwrap();
/// let (tx2, _) = build::transaction(vec![initial_tx(tx1), with_excess(sum),
/// output_rand(2)], keychain).unwrap();
public static (Transaction.Transaction transaction, BlindingFactor blindingFactor) Transaction(Func <Context, Append>[] elems, Keychain keychain)
{
var tx = Core.Transaction.Transaction.Empty();
var sum = BlindSum.New();
var ctx = new Context(keychain, tx, sum);
foreach (var elem in elems)
{
var append = elem(ctx);
tx = ctx.Tx = append.Transaction.Clone();
sum = ctx.Sum = append.Blind;
}
var blindSum = ctx.Keychain.Blind_sum(sum);
var msg = Message.from_slice(TransactionHelper.kernel_sig_msg(tx.Fee, tx.LockHeight));
var sig = ctx.Keychain.Sign_with_blinding(msg, blindSum);
tx.ExcessSig = sig.serialize_der(ctx.Keychain.Secp);
return(tx, blindSum);
}
public Context(Keychain keychain, Transaction.Transaction tx, BlindSum sum)
{
Keychain = keychain;
Tx = tx;
Sum = sum;
}
public Append(Transaction.Transaction transaction, BlindSum blind)
{
Transaction = transaction;
Blind = blind;
}