@polkadot/util-crypto/hd/ledger/master.js

A collection of useful crypto utilities for @polkadot

import { u8aConcat } from '@polkadot/util';
import { hmacShaAsU8a } from '../../hmac/index.js';
import { mnemonicToSeedSync } from '../../mnemonic/bip39.js';
const ED25519_CRYPTO = 'ed25519 seed';
/**
 * Gets an xprv from a mnemonic
 *
 * @param mnemonic - The BIP-39 mnemonic phrase to derive the secret from.
 * @param password - Optional: password to secure the seed (default: empty string).
 * @param wordlist - Optional custom wordlist for mnemonic.
 * @param onlyJs - Optional: If `true`, forces use of the JavaScript implementation instead of WASM.
 * @param rounds - Optional: Number of PBKDF2 iterations to run (default: 210000).
*/
export function ledgerMaster(mnemonic, password, rounds) {
    const seed = mnemonicToSeedSync(mnemonic, password, rounds);
    const chainCode = hmacShaAsU8a(ED25519_CRYPTO, new Uint8Array([1, ...seed]), 256);
    let priv;
    while (!priv || (priv[31] & 0b0010_0000)) {
        priv = hmacShaAsU8a(ED25519_CRYPTO, priv || seed, 512);
    }
    priv[0] &= 0b1111_1000;
    priv[31] &= 0b0111_1111;
    priv[31] |= 0b0100_0000;
    return u8aConcat(priv, chainCode);
}