stack_wallet/lib/services/coins/coin_paynym_extension.dart

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import 'dart:convert';
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import 'dart:typed_data';
import 'package:bip47/bip47.dart';
import 'package:bitcoindart/bitcoindart.dart';
import 'package:pointycastle/digests/sha256.dart';
import 'package:stackwallet/hive/db.dart';
import 'package:stackwallet/services/coins/dogecoin/dogecoin_wallet.dart';
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import 'package:stackwallet/utilities/format.dart';
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extension PayNym on DogecoinWallet {
// fetch or generate this wallet's bip47 payment code
Future<PaymentCode> getPaymentCode() async {
final paymentCodeString = DB.instance
.get<dynamic>(boxName: walletId, key: "paymentCodeString") as String?;
PaymentCode paymentCode;
if (paymentCodeString == null) {
final node = getBip32Root((await mnemonic).join(" "), network)
.derivePath("m/47'/0'/0'");
paymentCode =
PaymentCode.initFromPubKey(node.publicKey, node.chainCode, network);
await DB.instance.put<dynamic>(
boxName: walletId,
key: "paymentCodeString",
value: paymentCode.toString());
} else {
paymentCode = PaymentCode.fromPaymentCode(paymentCodeString, network);
}
return paymentCode;
}
Future<Uint8List> signWithNotificationKey(Uint8List data) async {
final node = getBip32Root((await mnemonic).join(" "), network)
.derivePath("m/47'/0'/0'");
final pair = ECPair.fromPrivateKey(node.privateKey!, network: network);
final signed = pair.sign(SHA256Digest().process(data));
return signed;
}
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Future<String> signStringWithNotificationKey(String data) async {
final bytes =
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await signWithNotificationKey(Uint8List.fromList(utf8.encode(data)));
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return Format.uint8listToString(bytes);
// final bytes =
// await signWithNotificationKey(Uint8List.fromList(utf8.encode(data)));
// return Format.uint8listToString(bytes);
}
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// Future<Map<String, dynamic>> prepareNotificationTransaction(
// String targetPaymentCode) async {}
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}