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wallet: ensure m_min_change_target always covers change fee

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S3RK
2022-08-15 09:30:31 +02:00
parent dc9d662683
commit c8cf08ea74
4 changed files with 11 additions and 6 deletions
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4
src/wallet/coinselection.h
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@@ -252,6 +252,7 @@ struct OutputGroup
/** Choose a random change target for each transaction to make it harder to fingerprint the Core
* wallet based on the change output values of transactions it creates.
* Change target covers at least change fees and adds a random value on top of it.
* The random value is between 50ksat and min(2 * payment_value, 1milsat)
* When payment_value <= 25ksat, the value is just 50ksat.
*
@@ -261,8 +262,9 @@ struct OutputGroup
* coins selected are just sufficient to cover the payment amount ("unnecessary input" heuristic).
*
* @param[in] payment_value Average payment value of the transaction output(s).
* @param[in] change_fee Fee for creating a change output.
*/
[[nodiscard]] CAmount GenerateChangeTarget(CAmount payment_value, FastRandomContext& rng);
[[nodiscard]] CAmount GenerateChangeTarget(const CAmount payment_value, const CAmount change_fee, FastRandomContext& rng);
enum class SelectionAlgorithm : uint8_t
{