From 40cf894a6124d21187d41312b7a0cf2ea6a0de97 Mon Sep 17 00:00:00 2001
From: jiaming <jiaminglim0828@gmail.com>
Date: Mon, 9 Oct 2023 17:55:08 +0800
Subject: [PATCH 1/2] sign txn with payload

---
 lib/src/model/account/account.dart            |  4 ++
 .../transaction/transaction_internal.dart     | 44 +++++++++++++++++++
 2 files changed, 48 insertions(+)

diff --git a/lib/src/model/account/account.dart b/lib/src/model/account/account.dart
index 8e308a5..b443c4a 100644
--- a/lib/src/model/account/account.dart
+++ b/lib/src/model/account/account.dart
@@ -78,6 +78,10 @@ class Account {
           Transaction tx, String generationHash) async =>
       signTransactionWith(tx, this, generationHash);
 
+  Future<SignedTransaction> signTransactionWithPayload(
+          String txnPayload, String generationHash) async =>
+      signTransactionWithTxnPayload(txnPayload, this, generationHash);
+
   Future<SignedTransaction> signWithCosignatures(Transaction tx,
           List<Account> cosignatories, String generationHash) async =>
       signTransactionWithCosignatures(tx, this, cosignatories, generationHash);
diff --git a/lib/src/model/transaction/transaction_internal.dart b/lib/src/model/transaction/transaction_internal.dart
index 14a21d0..beae715 100644
--- a/lib/src/model/transaction/transaction_internal.dart
+++ b/lib/src/model/transaction/transaction_internal.dart
@@ -261,6 +261,50 @@ Future<SignedTransaction> signTransactionWith(
       SignedTransaction(tx.absTransaction().type, pHex.toUpperCase(), hash));
 }
 
+Future<SignedTransaction> signTransactionWithTxnPayload(
+    String txnPayload, Account a, String generationHash) async {
+  final s = a.account;
+
+  final List<int> bytes = [];
+  for (int i = 0; i < txnPayload.length; i += 2) {
+    final hexPair = txnPayload.substring(i, i + 2);
+    final byte = int.parse(hexPair, radix: 16);
+    bytes.add(byte);
+  }
+
+  final b = Uint8List.fromList(bytes);
+
+  var sb = Uint8List.fromList(b.skip(100).take(b.length).toList());
+
+  sb = Uint8List.fromList(hex.decode(generationHash) + sb);
+
+  final signature = await s.sign(sb);
+
+  final p = <int>[]
+    ..insertAll(0, b.skip(0).take(4))
+    ..insertAll(4, signature.bytes)
+    ..insertAll(4 + 64, a.account.publicKey)
+    ..insertAll(100, b.skip(100).take(b.length));
+
+  final String pHex = hex.encode(p);
+
+  final hash = _createTransactionHash(pHex, generationHash);
+  const versionLength = 8;
+  const publicKeyLength = 64;
+  const typeLength = 4;
+  const sizeLength = 8;
+  const signatureLength = 128;
+  const signatureOffset = sizeLength;
+  const publicKeyOffset = signatureOffset + signatureLength;
+  const versionOffset = publicKeyOffset + publicKeyLength;
+  const typeOffset = versionOffset + versionLength;
+  const feeOffset = typeOffset + typeLength;
+  final type =
+      extractNumberFromHex(txnPayload.substring(typeOffset, feeOffset));
+  return SignedTransaction(
+      TransactionType.fromInt(type), pHex.toUpperCase(), hash);
+}
+
 Future<SignedTransaction> signTransactionWithCosignatures(Transaction tx,
     Account a, List<Account> cosignatories, String generationHash) async {
   final stx = await signTransactionWith(tx, a, generationHash);

From b001652f8d87bbe53d6042999955fa0036a8fc93 Mon Sep 17 00:00:00 2001
From: shinneng <shinneng@proximax.io>
Date: Mon, 9 Oct 2023 18:33:11 +0800
Subject: [PATCH 2/2] bump version

---
 CHANGELOG.md | 4 ++++
 README.md    | 4 ++--
 pubspec.yaml | 2 +-
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 30669a1..f494875 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.0.8
+### Updates
+[ADD] sign txn with Payload
+
 ## 0.0.8
 ### Updates
 [ADD] function to get encrypted private key with password
diff --git a/README.md b/README.md
index 00595de..785351e 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ Add this to your package's pubspec.yaml file:
 
 ```dart
 dependencies:
-  xpx_chain_sdk: 0.0.7+8
+  xpx_chain_sdk: 0.0.9
 ```
 
 **2. Install it**
@@ -52,4 +52,4 @@ For more examples, go to our [wiki](https://github.com/proximax-storage/dart-xpx
 We'd love to get more people involved in the project. Please feel free to raise any issues or PR and we'll review your
 contribution.
 
-Copyright (c) 2019 ProximaX Limited
+Copyright (c) 2023 ProximaX Limited
diff --git a/pubspec.yaml b/pubspec.yaml
index d8a8fff..242da58 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: xpx_chain_sdk
-version: 0.0.8
+version: 0.0.9
 #author: 'Eleazar Garrido <eleazartovar123@gmail.com>, ProximaX Devops <proximax.devops@gmail.com>'
 description: 'The ProximaX Sirius Chain Dart SDK works as a async lightweight Dart library for interacting with the Sirius Blockchain.'
 homepage: https://github.com/proximax-storage