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add helper method to multiply a public key

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This commit is contained in:
Craig Raw 2024-10-08 10:31:23 +02:00
parent f8f50c0dd9
commit acb1d767e8
2 changed files with 7 additions and 1 deletions
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2
src/main/java/com/sparrowwallet/drongo/OutputDescriptor.java
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@ -575,7 +575,7 @@ public class OutputDescriptor {
return builder.toString();
}
private List<ExtendedKey> sortExtendedPubKeys(Collection<ExtendedKey> keys) {
public List<ExtendedKey> sortExtendedPubKeys(Collection<ExtendedKey> keys) {
List<ExtendedKey> sortedKeys = new ArrayList<>(keys);
if(mapChildrenDerivations == null || mapChildrenDerivations.isEmpty() || mapChildrenDerivations.containsKey(null)) {
return sortedKeys;

6
src/main/java/com/sparrowwallet/drongo/crypto/ECKey.java
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@ -326,6 +326,12 @@ public class ECKey {
return pub.get();
}
/** Multiply the public point by the provided private key */
public ECKey multiply(BigInteger privKey) {
ECPoint point = pub.get().multiply(privKey);
return ECKey.fromPublicOnly(point, false);
}
/**
* Gets the private key in the form of an integer field element. The public key is derived by performing EC
* point addition this number of times (i.e. point multiplying).