feat: Start with signing txs

lib/hns.dart

@@ -0,0 +1,75 @@
+import 'package:flutter/services.dart';
+import 'package:flutter_bitcoin/flutter_bitcoin.dart' as bitcoin;
+import 'dart:typed_data';
+import 'package:hex/hex.dart';
+import 'package:crypto/crypto.dart';
+import 'package:bip39/bip39.dart' as bip39;
+import 'package:bip32/bip32.dart' as bip32;
+
+final bip32.NetworkType hnsMainnet = bip32.NetworkType(
+  bip32: bip32.Bip32Type(public: 0x0488b21e, private: 0x0488ade4),
+  wif: 0x80,
+);
+
+final bitcoin.NetworkType hnsMainnetBitcoin = bitcoin.NetworkType(
+    messagePrefix: '\x18Handshake Signed Message:\n',
+    bech32: 'hs',
+    bip32: bitcoin.Bip32Type(public: 0x0488b21e, private: 0x0488ade4),
+    pubKeyHash: 0x00,
+    scriptHash: 0x05,
+    wif: 0x80);
+
+String getXpub(String seedPhrase) {
+  List<int> seedints = bip39.mnemonicToSeed(seedPhrase);
+  Uint8List seed = Uint8List.fromList(seedints);
+  bip32.BIP32 master = bip32.BIP32.fromSeed(seed, hnsMainnet);
+  return master.derivePath("m/44'/5353'/0'").neutered().toBase58();
+}
+
+Future<String> signTX(String seedPhrase, Map<String, dynamic> txData) async {
+  final seed = bip39.mnemonicToSeed(seedPhrase);
+  final master = bip32.BIP32.fromSeed(seed, hnsMainnet);
+
+  final txb = bitcoin.TransactionBuilder(
+    network: hnsMainnetBitcoin,
+  );
+
+  // for (var input in txData['inputs']) {
+  //   final prevout = input['prevout'];
+  //   final vin = input['vin'];
+  //   if (vin != null && vin is int) {
+  //     final hash = prevout['hash'];
+  //     final index = prevout['index'];
+  //     bitcoin.ECPair keyPair = bitcoin.ECPair.fromPrivateKey(
+  //         master.derivePath("m/44'/5353'/0'/0/$vin").privateKey!,
+  //         network: hnsMainnetBitcoin);
+  //     txb.addInput(hash, index);
+  //     txb.sign(vin: vin, keyPair: keyPair);
+  //   } else {
+  //     print('vin is not an int');
+  //     print(input);
+  //   }
+  // }
+  for (var input in txData['inputs']) {
+    final prevout = input['prevout'];
+    final coin = input['coin'];
+    final index = prevout['index'];
+    final hash = prevout['hash'];
+    final vin = coin['height'];
+    print(input);
+
+    bitcoin.ECPair keyPair = bitcoin.ECPair.fromPrivateKey(
+      master.derivePath("m/44'/5353'/0'/0/$vin").privateKey!,
+      network: hnsMainnetBitcoin,
+    );
+
+    txb.addInput(hash, index);
+    txb.sign(vin: int.parse(vin.toString()), keyPair: keyPair);
+  }
+
+  for (var output in txData['outputs']) {
+    txb.addOutput(output['address'], output['value']);
+  }
+
+  return txb.build().toHex();
+}

lib/send.dart

@@ -4,7 +4,12 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:http/http.dart' as http;
 import 'dart:convert';
-import 'package:qr_flutter/qr_flutter.dart';
+import 'package:flutter_bitcoin/flutter_bitcoin.dart';
+import 'package:bip39/bip39.dart' as bip39;
+import 'package:bip32/bip32.dart' as bip32;
+import 'package:crypto/crypto.dart';
+import 'dart:typed_data';
+import 'package:firewallet/hns.dart' as hns;
 
 class SendPage extends StatefulWidget {
   SendPage({Key? key, required this.uuid, required this.wallet})
@@ -168,8 +173,16 @@ class _SendPageState extends State<SendPage> {
             content: Text('Sent $amount HNS to $toAddress'),
           ),
         );
+
+        String seedPhrase = 'abandon abandon abandon abandon abandon abandon ' +
+            'abandon abandon abandon abandon abandon about';
+        print(hns.getXpub(seedPhrase));
+        hns.signTX(seedPhrase, data).then((tx) {
+          print(tx);
+        });
+
         if (sendMax) {
-          amountController.text = '';
+          // amountController.text = '';
         } else {
           amountController.text =
               min(amount, walletBalance - 0.02).toStringAsFixed(2);

pubspec.lock

@@ -25,6 +25,30 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.11.0"
+  bech32:
+    dependency: transitive
+    description:
+      name: bech32
+      sha256: "156cbace936f7720c79a79d16a03efad343b1ef17106716e04b8b8e39f99f7f7"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.2.2"
+  bip32:
+    dependency: "direct main"
+    description:
+      name: bip32
+      sha256: "54787cd7a111e9d37394aabbf53d1fc5e2e0e0af2cd01c459147a97c0e3f8a97"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.0"
+  bip39:
+    dependency: "direct main"
+    description:
+      name: bip39
+      sha256: de1ee27ebe7d96b84bb3a04a4132a0a3007dcdd5ad27dd14aa87a29d97c45edc
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.6"
   boolean_selector:
     dependency: transitive
     description:
@@ -33,6 +57,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.1"
+  bs58check:
+    dependency: transitive
+    description:
+      name: bs58check
+      sha256: c4a164d42b25c2f6bc88a8beccb9fc7d01440f3c60ba23663a20a70faf484ea9
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.2"
   characters:
     dependency: transitive
     description:
@@ -73,8 +105,16 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.18.0"
-  crypto:
+  convert:
     dependency: transitive
+    description:
+      name: convert
+      sha256: "0f08b14755d163f6e2134cb58222dd25ea2a2ee8a195e53983d57c075324d592"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.1"
+  crypto:
+    dependency: "direct main"
     description:
       name: crypto
       sha256: ff625774173754681d66daaf4a448684fb04b78f902da9cb3d308c19cc5e8bab
@@ -118,6 +158,14 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_bitcoin:
+    dependency: "direct main"
+    description:
+      name: flutter_bitcoin
+      sha256: "1a783c4d80f83b1ba5dedb4f18ebf522c90dd99e6fa0224b5228f68aa29b3442"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.1"
   flutter_launcher_icons:
     dependency: "direct dev"
     description:
@@ -144,6 +192,14 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  hex:
+    dependency: "direct main"
+    description:
+      name: hex
+      sha256: "4e7cd54e4b59ba026432a6be2dd9d96e4c5205725194997193bf871703b82c4a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.2.0"
   http:
     dependency: "direct main"
     description:
@@ -168,6 +224,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.2.0"
+  js:
+    dependency: transitive
+    description:
+      name: js
+      sha256: c1b2e9b5ea78c45e1a0788d29606ba27dc5f71f019f32ca5140f61ef071838cf
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.7.1"
   json_annotation:
     dependency: transitive
     description:
@@ -288,6 +352,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.8"
+  pointycastle:
+    dependency: "direct main"
+    description:
+      name: pointycastle
+      sha256: "4be0097fcf3fd3e8449e53730c631200ebc7b88016acecab2b0da2f0149222fe"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.9.1"
   qr:
     dependency: transitive
     description:

pubspec.yaml

@@ -39,6 +39,12 @@ dependencies:
   http: ^1.2.1
   url_launcher: ^6.2.6
   qr_flutter: ^4.1.0
+  flutter_bitcoin: ^1.0.1
+  crypto: ^3.0.3
+  pointycastle: ^3.9.1
+  bip39: ^1.0.6
+  bip32: ^2.0.0
+  hex: ^0.2.0
 
 dev_dependencies:
   flutter_test: