@bitgo/utxo-lib
Version:
Client-side Bitcoin JavaScript library
104 lines • 11.9 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.RootWalletKeys = exports.DerivedWalletKeys = exports.WalletKeys = void 0;
exports.eqPublicKey = eqPublicKey;
function eqPublicKey(a, b) {
return a.publicKey.equals(b.publicKey);
}
/**
* Base class for RootWalletKeys and DerivedWalletKeys.
* Keys can be either public keys or private keys.
*/
class WalletKeys {
/**
* @param triple - bip32 key triple
*/
constructor(triple) {
this.triple = triple;
triple.forEach((a, i) => {
triple.forEach((b, j) => {
if (eqPublicKey(a, b) && i !== j) {
throw new Error(`wallet keys must be distinct`);
}
});
});
this.publicKeys = this.triple.map((k) => k.publicKey);
}
get user() {
return this.triple[0];
}
get backup() {
return this.triple[1];
}
get bitgo() {
return this.triple[2];
}
}
exports.WalletKeys = WalletKeys;
/**
* Set of WalletKeys derived from RootWalletKeys. Suitable for signing transaction inputs.
* Contains reference to the RootWalletKeys this was derived from as well as the paths used
* for derivation.
*/
class DerivedWalletKeys extends WalletKeys {
/**
* @param parent - wallet keys to derive from
* @param paths - paths to derive with
*/
constructor(parent, paths) {
super(parent.triple.map((k, i) => k.derivePath(paths[i])));
this.parent = parent;
this.paths = paths;
}
}
exports.DerivedWalletKeys = DerivedWalletKeys;
/**
* Set of root wallet keys, typically instantiated using the wallet xpub triple.
*/
class RootWalletKeys extends WalletKeys {
/**
* @param triple - bip32 key triple
* @param derivationPrefixes - Certain v1 wallets or their migrated v2 counterparts
* can have a nonstandard prefix.
*/
constructor(triple, derivationPrefixes = [
RootWalletKeys.defaultPrefix,
RootWalletKeys.defaultPrefix,
RootWalletKeys.defaultPrefix,
]) {
super(triple);
this.derivationPrefixes = derivationPrefixes;
derivationPrefixes.forEach((p) => {
if (p.startsWith('/') || p.endsWith('/')) {
throw new Error(`derivation prefix must not start or end with a slash`);
}
});
}
/**
* @param key
* @param chain
* @param index
* @return full derivation path for key, including key-specific prefix
*/
getDerivationPath(key, chain, index) {
if (!this.derivationPrefixes) {
throw new Error(`no derivation prefixes`);
}
const prefix = this.derivationPrefixes.find((prefix, i) => eqPublicKey(key, this.triple[i]));
if (prefix === undefined) {
throw new Error(`key not in walletKeys`);
}
return `${prefix}/${chain}/${index}`;
}
/**
* @param chain
* @param index
* @return walletKeys for a particular address identified by (chain, index)
*/
deriveForChainAndIndex(chain, index) {
return new DerivedWalletKeys(this, this.triple.map((k) => this.getDerivationPath(k, chain, index)));
}
}
exports.RootWalletKeys = RootWalletKeys;
RootWalletKeys.defaultPrefix = '0/0';
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(In rare cases the prefix 0/0 can be different)\n *\n * Since we never use other derivations for utxo address scripts, the classes defined here only\n * allow exactly one level of derivation.\n */\nimport { BIP32Interface } from '@bitgo/secp256k1';\n\nimport { Triple } from '../types';\n\nexport type KeyName = 'user' | 'backup' | 'bitgo';\n\nexport function eqPublicKey(a: BIP32Interface, b: BIP32Interface): boolean {\n  return a.publicKey.equals(b.publicKey);\n}\n\n/**\n * Base class for RootWalletKeys and DerivedWalletKeys.\n * Keys can be either public keys or private keys.\n */\nexport class WalletKeys {\n  public readonly publicKeys: Triple<Buffer>;\n\n  /**\n   * @param triple - bip32 key triple\n   */\n  constructor(public readonly triple: Triple<BIP32Interface>) {\n    triple.forEach((a, i) => {\n      triple.forEach((b, j) => {\n        if (eqPublicKey(a, b) && i !== j) {\n          throw new Error(`wallet keys must be distinct`);\n        }\n      });\n    });\n\n    this.publicKeys = this.triple.map((k) => k.publicKey) as Triple<Buffer>;\n  }\n\n  get user(): BIP32Interface {\n    return this.triple[0];\n  }\n\n  get backup(): BIP32Interface {\n    return this.triple[1];\n  }\n\n  get bitgo(): BIP32Interface {\n    return this.triple[2];\n  }\n}\n\n/**\n * Set of WalletKeys derived from RootWalletKeys. Suitable for signing transaction inputs.\n * Contains reference to the RootWalletKeys this was derived from as well as the paths used\n * for derivation.\n */\nexport class DerivedWalletKeys extends WalletKeys {\n  /**\n   * @param parent - wallet keys to derive from\n   * @param paths - paths to derive with\n   */\n  constructor(public parent: RootWalletKeys, public paths: Triple<string>) {\n    super(parent.triple.map((k, i) => k.derivePath(paths[i])) as Triple<BIP32Interface>);\n  }\n}\n\n/**\n * Set of root wallet keys, typically instantiated using the wallet xpub triple.\n */\nexport class RootWalletKeys extends WalletKeys {\n  static readonly defaultPrefix = '0/0';\n\n  /**\n   * @param triple - bip32 key triple\n   * @param derivationPrefixes - Certain v1 wallets or their migrated v2 counterparts\n   *                             can have a nonstandard prefix.\n   */\n  constructor(\n    triple: Triple<BIP32Interface>,\n    public readonly derivationPrefixes: Triple<string> = [\n      RootWalletKeys.defaultPrefix,\n      RootWalletKeys.defaultPrefix,\n      RootWalletKeys.defaultPrefix,\n    ]\n  ) {\n    super(triple);\n\n    derivationPrefixes.forEach((p) => {\n      if (p.startsWith('/') || p.endsWith('/')) {\n        throw new Error(`derivation prefix must not start or end with a slash`);\n      }\n    });\n  }\n\n  /**\n   * @param key\n   * @param chain\n   * @param index\n   * @return full derivation path for key, including key-specific prefix\n   */\n  getDerivationPath(key: BIP32Interface, chain: number, index: number): string {\n    if (!this.derivationPrefixes) {\n      throw new Error(`no derivation prefixes`);\n    }\n    const prefix = this.derivationPrefixes.find((prefix, i) => eqPublicKey(key, this.triple[i]));\n    if (prefix === undefined) {\n      throw new Error(`key not in walletKeys`);\n    }\n    return `${prefix}/${chain}/${index}`;\n  }\n\n  /**\n   * @param chain\n   * @param index\n   * @return walletKeys for a particular address identified by (chain, index)\n   */\n  deriveForChainAndIndex(chain: number, index: number): DerivedWalletKeys {\n    return new DerivedWalletKeys(\n      this,\n      this.triple.map((k) => this.getDerivationPath(k, chain, index)) as Triple<string>\n    );\n  }\n}\n"]}