/*
*******************************************************************************
* BTChip Bitcoin Hardware Wallet Java API
* (c) 2014 BTChip - 1BTChip7VfTnrPra5jqci7ejnMguuHogTn
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
********************************************************************************
*/
package com.btchip.utils;
import java.io.ByteArrayOutputStream;
import com.btchip.BTChipException;
public class BIP32Utils {
public static byte[] splitPath(String path) throws BTChipException {
if (path.length() == 0) {
return new byte[] { 0 };
}
String elements[] = path.split("/");
if (elements.length > 10) {
throw new BTChipException("Path too long");
}
ByteArrayOutputStream result = new ByteArrayOutputStream();
result.write((byte)elements.length);
for (String element : elements) {
long elementValue;
int hardenedIndex = element.indexOf('\'');
if (hardenedIndex > 0) {
elementValue = Long.parseLong(element.substring(0, hardenedIndex));
elementValue |= 0x80000000;
}
else {
elementValue = Long.parseLong(element);
}
BufferUtils.writeUint32BE(result, elementValue);
}
return result.toByteArray();
}
}