@okxweb3/coin-bitcoin
Version:
@ok/coin-bitcoin is a Bitcoin SDK for building Web3 wallets and applications. It supports BTC, BSV, DOGE, LTC, and TBTC, enabling private key management, transaction signing, address generation, and inscriptions like BRC-20, Runes, CAT, and Atomicals.
78 lines • 2.97 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.makeConverter = void 0;
const range = (n) => [...Array(n).keys()];
const isValidDERKey = (pubkey) => (pubkey.length === 33 && [2, 3].includes(pubkey[0])) ||
(pubkey.length === 65 && 4 === pubkey[0]);
function makeConverter(TYPE_BYTE, isValidPubkey = isValidDERKey) {
function decode(keyVal) {
if (keyVal.key[0] !== TYPE_BYTE) {
throw new Error('Decode Error: could not decode bip32Derivation with key 0x' +
keyVal.key.toString('hex'));
}
const pubkey = keyVal.key.slice(1);
if (!isValidPubkey(pubkey)) {
throw new Error('Decode Error: bip32Derivation has invalid pubkey in key 0x' +
keyVal.key.toString('hex'));
}
if ((keyVal.value.length / 4) % 1 !== 0) {
throw new Error('Decode Error: Input BIP32_DERIVATION value length should be multiple of 4');
}
const data = {
masterFingerprint: keyVal.value.slice(0, 4),
pubkey,
path: 'm',
};
for (const i of range(keyVal.value.length / 4 - 1)) {
const val = keyVal.value.readUInt32LE(i * 4 + 4);
const isHard = !!(val & 0x80000000);
const idx = val & 0x7fffffff;
data.path += '/' + idx.toString(10) + (isHard ? "'" : '');
}
return data;
}
function encode(data) {
const head = Buffer.from([TYPE_BYTE]);
const key = Buffer.concat([head, data.pubkey]);
const splitPath = data.path.split('/');
const value = Buffer.allocUnsafe(splitPath.length * 4);
data.masterFingerprint.copy(value, 0);
let offset = 4;
splitPath.slice(1).forEach(level => {
const isHard = level.slice(-1) === "'";
let num = 0x7fffffff & parseInt(isHard ? level.slice(0, -1) : level, 10);
if (isHard)
num += 0x80000000;
value.writeUInt32LE(num, offset);
offset += 4;
});
return {
key,
value,
};
}
const expected = '{ masterFingerprint: Buffer; pubkey: Buffer; path: string; }';
function check(data) {
return (Buffer.isBuffer(data.pubkey) &&
Buffer.isBuffer(data.masterFingerprint) &&
typeof data.path === 'string' &&
isValidPubkey(data.pubkey) &&
data.masterFingerprint.length === 4);
}
function canAddToArray(array, item, dupeSet) {
const dupeString = item.pubkey.toString('hex');
if (dupeSet.has(dupeString))
return false;
dupeSet.add(dupeString);
return array.filter(v => v.pubkey.equals(item.pubkey)).length === 0;
}
return {
decode,
encode,
check,
expected,
canAddToArray,
};
}
exports.makeConverter = makeConverter;
//# sourceMappingURL=bip32Derivation.js.map