@ledgerhq/hw-app-btc
Version:
Ledger Hardware Wallet Bitcoin Application API
53 lines • 1.87 kB
JavaScript
/**
* @file bip32.ts
* @description BIP32 Path Handling for Bitcoin Wallets
*
* This file provides utility functions to handle BIP32 paths,
* which are commonly used in hierarchical deterministic (HD) wallets.
* It includes functions to convert BIP32 paths to and from different formats,
* extract components from extended public keys (xpubs), and manipulate path elements.
*/
import bippath from "bip32-path";
import bs58check from "bs58check";
export function pathElementsToBuffer(paths) {
const buffer = Buffer.alloc(1 + paths.length * 4);
buffer[0] = paths.length;
paths.forEach((element, index) => {
buffer.writeUInt32BE(element, 1 + 4 * index);
});
return buffer;
}
export function bip32asBuffer(path) {
const pathElements = !path ? [] : pathStringToArray(path);
return pathElementsToBuffer(pathElements);
}
export function pathArrayToString(pathElements) {
// Limitation: bippath can't handle and empty path. It shouldn't affect us
// right now, but might in the future.
// TODO: Fix support for empty path.
return bippath.fromPathArray(pathElements).toString();
}
export function pathStringToArray(path) {
return bippath.fromString(path).toPathArray();
}
export function pubkeyFromXpub(xpub) {
const xpubBuf = bs58check.decode(xpub);
return xpubBuf.slice(xpubBuf.length - 33);
}
export function getXpubComponents(xpub) {
const xpubBuf = bs58check.decode(xpub);
return {
chaincode: xpubBuf.slice(13, 13 + 32),
pubkey: xpubBuf.slice(xpubBuf.length - 33),
version: xpubBuf.readUInt32BE(0),
};
}
export function hardenedPathOf(pathElements) {
for (let i = pathElements.length - 1; i >= 0; i--) {
if (pathElements[i] >= 0x80000000) {
return pathElements.slice(0, i + 1);
}
}
return [];
}
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