getMasterKeyFromSeed function
Implementation
Keys getMasterKeyFromSeed(String seed) {
final keyBytes = Uint8List.fromList(utf8.encode(HMAC_KEY));
final seedBytes = Uint8List.fromList(hex.decode(seed));
final digest = hmacSha512(keyBytes, seedBytes);
final IL = digest.sublist(0, 32);
final IR = digest.sublist(32);
return Keys(key: IL, chainCode: IR);
}