| 1 | import 'dart:math'; |
| 2 | |
| 3 | import 'package:bitcoin_base/bitcoin_base.dart'; |
| 4 | |
| 5 | /// Applies [ordering] to a transaction's [outputs] before building. |
| 6 | /// |
| 7 | /// Returns a new list; the input is never mutated. Only [BitcoinOrdering.shuffle] |
| 8 | /// reorders (using a secure RNG by default) so the change output is no longer |
| 9 | /// placed deterministically last. Any other value preserves the given order, |
| 10 | /// matching the pre-existing hardware-wallet behavior. |
| 11 | List<T> orderOutputs<T>( |
| 12 | List<T> outputs, |
| 13 | BitcoinOrdering ordering, { |
| 14 | Random? rng, |
| 15 | }) { |
| 16 | final result = List<T>.of(outputs); |
| 17 | if (ordering == BitcoinOrdering.shuffle) { |
| 18 | result.shuffle(rng ?? Random.secure()); |
| 19 | } |
| 20 | return result; |
| 21 | } |