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added a helper function to parse human readable deterministic paths

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This commit is contained in:
Giannis Dzegoutanis 2014-06-26 17:06:18 +02:00 committed by Mike Hearn
parent dbd6004f1b
commit fd0c6a27f4
2 changed files with 55 additions and 3 deletions
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28
core/src/main/java/com/google/bitcoin/crypto/HDUtils.java
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@ -1,5 +1,6 @@
/**
* Copyright 2013 Matija Mazi.
* Copyright 2014 Giannis Dzegoutanis.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -24,11 +25,15 @@ import org.spongycastle.crypto.digests.SHA512Digest;
import org.spongycastle.crypto.macs.HMac;
import org.spongycastle.crypto.params.KeyParameter;
import javax.annotation.Nonnull;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* Static utilities used in BIP 32 Hierarchical Deterministic Wallets (HDW).
*/
@ -71,4 +76,27 @@ public final class HDUtils {
public static String formatPath(List<ChildNumber> path) {
return PATH_JOINER.join(Iterables.concat(Collections.singleton("M"), path));
}
/**
* The path is a human-friendly representation of the deterministic path. For example:
*
* "44' / 0' / 0' / 1 / 1"
*
* Where a single quote (') means hardened key. Spaces are ignored.
*/
public static List<ChildNumber> parsePath(@Nonnull String path) {
String[] parsedNodes = path.split("/");
List<ChildNumber> nodes = new ArrayList<ChildNumber>();
for (String n : parsedNodes) {
n = n.replaceAll(" ", "");
if (n.length() == 0) continue;
boolean isHard = n.endsWith("'");
if (isHard) n = n.substring(0, n.length() - 1);
int nodeNumber = Integer.parseInt(n);
nodes.add(new ChildNumber(nodeNumber, isHard));
}
return nodes;
}
}

30
core/src/test/java/com/google/bitcoin/crypto/HDUtilsTest.java
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@ -17,14 +17,13 @@
package com.google.bitcoin.crypto;
import com.google.common.collect.ImmutableList;
import org.junit.Assert;
import org.junit.Test;
import static com.google.bitcoin.core.Utils.HEX;
import java.util.List;
/**
* @author Matija Mazi <br/>
*/
public class HDUtilsTest {
@Test
public void testHmac() throws Exception {
@ -124,4 +123,29 @@ public class HDUtilsTest {
byte[] bytes = HDUtils.longTo4ByteArray(1026);
Assert.assertEquals("00000402", HEX.encode(bytes));
}
@Test
public void testParsePath() {
Object tv[] = {
"44' / 0' / 0' / 1 / 1",
ImmutableList.of(new ChildNumber(44, true), new ChildNumber(0, true), new ChildNumber(0, true),
new ChildNumber(1, false), new ChildNumber(1, false)),
"/7'/3/3/1'/",
ImmutableList.of(new ChildNumber(7, true), new ChildNumber(3, false), new ChildNumber(3, false),
new ChildNumber(1, true)),
"1 ' / 2 ' / 3 ' /",
ImmutableList.of(new ChildNumber(1, true), new ChildNumber(2, true), new ChildNumber(3, true)),
"1 ' / 2 ' / 3 ' /",
ImmutableList.of(new ChildNumber(1, true), new ChildNumber(2, true), new ChildNumber(3, true))
};
for (int i = 0; i < tv.length; i += 2) {
List<ChildNumber> path = HDUtils.parsePath((String) tv[i]);
Assert.assertEquals(path, tv[i+1]);
}
}
}