@polkadot/util-crypto
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A collection of useful crypto utilities for @polkadot
29 lines (28 loc) • 1.27 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.ledgerMaster = ledgerMaster;
const util_1 = require("@polkadot/util");
const index_js_1 = require("../../hmac/index.js");
const bip39_js_1 = require("../../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).
*/
function ledgerMaster(mnemonic, password, rounds) {
const seed = (0, bip39_js_1.mnemonicToSeedSync)(mnemonic, password, rounds);
const chainCode = (0, index_js_1.hmacShaAsU8a)(ED25519_CRYPTO, new Uint8Array([1, ...seed]), 256);
let priv;
while (!priv || (priv[31] & 0b0010_0000)) {
priv = (0, index_js_1.hmacShaAsU8a)(ED25519_CRYPTO, priv || seed, 512);
}
priv[0] &= 0b1111_1000;
priv[31] &= 0b0111_1111;
priv[31] |= 0b0100_0000;
return (0, util_1.u8aConcat)(priv, chainCode);
}