Installation

From npm:

npm install slip32

From git:

git clone https://github.com/witnet/ts-slip32.git
cd ts-slip32
yarn
yarn build

Usage

The main two functions are described in slip32.d.ts:

/**
 * Import key from Slip32 format
 * @param {string} slip32
 * @returns {{keyPath: KeyPath; extendedKey: ExtendedKey<PrivateKey | PublicKey>}}
 */
export declare const importKeyFromSlip32: (slip32: string) => {
    keyPath: number[];
    extendedKey: ExtendedKey<PrivateKey | PublicKey>;
};

/**
 * Export key to Slip32 format
 * @param {KeyPath} keyPath
 * @param {ExtendedKey<PrivateKey> | ExtendedKey<PublicKey>} extendedKey
 * @returns {string}
 */
export declare const exportKeyToSlip32: (keyPath: number[], extendedKey: ExtendedKey<PrivateKey | PublicKey>) => string;

The aforementioned functions use the following interfaces and types, defined in keys.d.ts:

/**
 * Key interface
 * The buffer should have a length of 32 bytes
 */
export interface Key {
    bytes: Uint8Array;
}

/**
 * Chain code (32 bytes)
 */
export declare type ChainCode = Uint8Array;

/**
 * Private Key (33 bytes)
 */
export interface PrivateKey extends Key {
    type: "private";
}

/**
 * Public Key (33 bytes)
 */
export interface PublicKey extends Key {
    type: "public";
}

/**
 * Extended keys, as introduced by BIP-0032, pair a key with a chain code
 */
export declare type ExtendedKey<Key> = {
    key: Key;
    chainCode: ChainCode;
};

Example

import * as Slip32 from "slip32"

const keyToImport = "xprv1qxqqqqqq78qr7hlewyyfzt74vasa87k63pu7g9e6hfzlzrdyh0v5k8zfw9sqpsyv7vcejeyzcpkm85jel7vmujlhpquzf4f3sh3nry0w0n4jh7t0jhc039"

// Import key as {keyPath: KeyPath, extendedKey: ExtendedKey<PrivateKey | PublicKey>}
const importedKey = Slip32.importKeyFromSlip32(keyToImport)

// Export key as string
const exportedKey = Slip32.exportKeyToSlip32(importedKey.keyPath, importedKey.extendedKey)

License

This library is free and open-source software released under the MIT license.