Decrypt Kin QR code

decrypt_kin_qr.js

import libsodium from 'libsodium-wrappers';
import kinSdk from '@kinecosystem/kin-sdk-v2';

const KEY_SIZE = 32;

// Password provided during backup process
const PASSPHRASE = '<your passphrase>';

// "salt" value from QR code JSON
const SALT = '<your salt>';

// "seed" value from QR code JSON
const SEED = '<your seed>';

(async () => {
  await libsodium.ready;
  const sodium = libsodium;

  const hashBytes = sodium.crypto_pwhash(
    KEY_SIZE,
    PASSPHRASE,
    sodium.from_hex(SALT),
    sodium.crypto_pwhash_OPSLIMIT_INTERACTIVE,
    sodium.crypto_pwhash_MEMLIMIT_INTERACTIVE,
    sodium.crypto_pwhash_ALG_DEFAULT,
  );

  const seedBytes = sodium.from_hex(SEED);
  const nonce = seedBytes.slice(0, sodium.crypto_secretbox_NONCEBYTES);
  const cipherText = seedBytes.slice(sodium.crypto_secretbox_NONCEBYTES);
  const decryptedSeedBytes = sodium.crypto_secretbox_open_easy(cipherText, nonce, hashBytes).slice(0, KEY_SIZE);

  const privateKey = kinSdk.PrivateKey.fromString(decryptedSeedBytes);
  console.log(privateKey.publicKey().toBase58());
  // expecting same value as "pkey" from QR code JSON, but different public address returned?
})();