_ Git - ldk-java/blob - src/main/java/org/ldk/structs/KeysManager.java

   1 package org.ldk.structs;
   2
   3 import org.ldk.impl.bindings;
   4 import org.ldk.enums.*;
   5 import org.ldk.util.*;
   6 import java.util.Arrays;
   7 import java.lang.ref.Reference;
   8 import javax.annotation.Nullable;
   9
  10
  11 /**
  12  * Simple [`KeysInterface`] implementation that takes a 32-byte seed for use as a BIP 32 extended
  13  * key and derives keys from that.
  14  *
  15  * Your `node_id` is seed/0'.
  16  * Unilateral closes may use seed/1'.
  17  * Cooperative closes may use seed/2'.
  18  * The two close keys may be needed to claim on-chain funds!
  19  *
  20  * This struct cannot be used for nodes that wish to support receiving phantom payments;
  21  * [`PhantomKeysManager`] must be used instead.
  22  *
  23  * Note that switching between this struct and [`PhantomKeysManager`] will invalidate any
  24  * previously issued invoices and attempts to pay previous invoices will fail.
  25  */
  26 @SuppressWarnings("unchecked") // We correctly assign various generic arrays
  27 public class KeysManager extends CommonBase {
  28         KeysManager(Object _dummy, long ptr) { super(ptr); }
  29         @Override @SuppressWarnings("deprecation")
  30         protected void finalize() throws Throwable {
  31                 super.finalize();
  32                 if (ptr != 0) { bindings.KeysManager_free(ptr); }
  33         }
  34
  35         /**
  36          * Constructs a [`KeysManager`] from a 32-byte seed. If the seed is in some way biased (e.g.,
  37          * your CSRNG is busted) this may panic (but more importantly, you will possibly lose funds).
  38          * `starting_time` isn't strictly required to actually be a time, but it must absolutely,
  39          * without a doubt, be unique to this instance. ie if you start multiple times with the same
  40          * `seed`, `starting_time` must be unique to each run. Thus, the easiest way to achieve this
  41          * is to simply use the current time (with very high precision).
  42          *
  43          * The `seed` MUST be backed up safely prior to use so that the keys can be re-created, however,
  44          * obviously, `starting_time` should be unique every time you reload the library - it is only
  45          * used to generate new ephemeral key data (which will be stored by the individual channel if
  46          * necessary).
  47          *
  48          * Note that the seed is required to recover certain on-chain funds independent of
  49          * [`ChannelMonitor`] data, though a current copy of [`ChannelMonitor`] data is also required
  50          * for any channel, and some on-chain during-closing funds.
  51          *
  52          * [`ChannelMonitor`]: crate::chain::channelmonitor::ChannelMonitor
  53          */
  54         public static KeysManager of(byte[] seed, long starting_time_secs, int starting_time_nanos) {
  55                 long ret = bindings.KeysManager_new(InternalUtils.check_arr_len(seed, 32), starting_time_secs, starting_time_nanos);
  56                 Reference.reachabilityFence(seed);
  57                 Reference.reachabilityFence(starting_time_secs);
  58                 Reference.reachabilityFence(starting_time_nanos);
  59                 if (ret >= 0 && ret <= 4096) { return null; }
  60                 org.ldk.structs.KeysManager ret_hu_conv = null; if (ret < 0 || ret > 4096) { ret_hu_conv = new org.ldk.structs.KeysManager(null, ret); }
  61                 if (ret_hu_conv != null) { ret_hu_conv.ptrs_to.add(ret_hu_conv); };
  62                 return ret_hu_conv;
  63         }
  64
  65         /**
  66          * Derive an old [`Sign`] containing per-channel secrets based on a key derivation parameters.
  67          */
  68         public InMemorySigner derive_channel_keys(long channel_value_satoshis, byte[] params) {
  69                 long ret = bindings.KeysManager_derive_channel_keys(this.ptr, channel_value_satoshis, InternalUtils.check_arr_len(params, 32));
  70                 Reference.reachabilityFence(this);
  71                 Reference.reachabilityFence(channel_value_satoshis);
  72                 Reference.reachabilityFence(params);
  73                 if (ret >= 0 && ret <= 4096) { return null; }
  74                 org.ldk.structs.InMemorySigner ret_hu_conv = null; if (ret < 0 || ret > 4096) { ret_hu_conv = new org.ldk.structs.InMemorySigner(null, ret); }
  75                 if (ret_hu_conv != null) { ret_hu_conv.ptrs_to.add(this); };
  76                 return ret_hu_conv;
  77         }
  78
  79         /**
  80          * Creates a [`Transaction`] which spends the given descriptors to the given outputs, plus an
  81          * output to the given change destination (if sufficient change value remains). The
  82          * transaction will have a feerate, at least, of the given value.
  83          *
  84          * Returns `Err(())` if the output value is greater than the input value minus required fee,
  85          * if a descriptor was duplicated, or if an output descriptor `script_pubkey`
  86          * does not match the one we can spend.
  87          *
  88          * We do not enforce that outputs meet the dust limit or that any output scripts are standard.
  89          *
  90          * May panic if the [`SpendableOutputDescriptor`]s were not generated by channels which used
  91          * this [`KeysManager`] or one of the [`InMemorySigner`] created by this [`KeysManager`].
  92          */
  93         public Result_TransactionNoneZ spend_spendable_outputs(SpendableOutputDescriptor[] descriptors, TxOut[] outputs, byte[] change_destination_script, int feerate_sat_per_1000_weight) {
  94                 long ret = bindings.KeysManager_spend_spendable_outputs(this.ptr, descriptors != null ? Arrays.stream(descriptors).mapToLong(descriptors_conv_27 -> descriptors_conv_27.ptr).toArray() : null, outputs != null ? Arrays.stream(outputs).mapToLong(outputs_conv_7 -> outputs_conv_7.ptr).toArray() : null, change_destination_script, feerate_sat_per_1000_weight);
  95                 Reference.reachabilityFence(this);
  96                 Reference.reachabilityFence(descriptors);
  97                 Reference.reachabilityFence(outputs);
  98                 Reference.reachabilityFence(change_destination_script);
  99                 Reference.reachabilityFence(feerate_sat_per_1000_weight);
 100                 if (ret >= 0 && ret <= 4096) { return null; }
 101                 Result_TransactionNoneZ ret_hu_conv = Result_TransactionNoneZ.constr_from_ptr(ret);
 102                 return ret_hu_conv;
 103         }
 104
 105         /**
 106          * Constructs a new KeysInterface which calls the relevant methods on this_arg.
 107          * This copies the `inner` pointer in this_arg and thus the returned KeysInterface must be freed before this_arg is
 108          */
 109         public KeysInterface as_KeysInterface() {
 110                 long ret = bindings.KeysManager_as_KeysInterface(this.ptr);
 111                 Reference.reachabilityFence(this);
 112                 if (ret >= 0 && ret <= 4096) { return null; }
 113                 KeysInterface ret_hu_conv = new KeysInterface(null, ret);
 114                 if (ret_hu_conv != null) { ret_hu_conv.ptrs_to.add(this); };
 115                 return ret_hu_conv;
 116         }
 117
 118 }