From d11ccde30fb92a4905899af679be86fb61e02ada Mon Sep 17 00:00:00 2001
From: Pavel Vasin <pavel@vasin.nl>
Date: Fri, 29 Nov 2019 15:07:04 +0200
Subject: [PATCH] qt: use CHashWriter also in SignVerifyMessageDialog

This eliminates unnecessary copying of data being hashed.
---
 src/qt/signverifymessagedialog.cpp |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/qt/signverifymessagedialog.cpp b/src/qt/signverifymessagedialog.cpp
index 0782a46..7f39763 100644
--- a/src/qt/signverifymessagedialog.cpp
+++ b/src/qt/signverifymessagedialog.cpp
@@ -140,12 +140,12 @@ void SignVerifyMessageDialog::on_signMessageButton_SM_clicked()
         return;
     }
 
-    CDataStream ss(SER_GETHASH, 0);
+    CHashWriter ss(SER_GETHASH, 0);
     ss << strMessageMagic;
     ss << ui->messageIn_SM->document()->toPlainText().toStdString();
 
     std::vector<unsigned char> vchSig;
-    if (!key.SignCompact(Hash(ss.begin(), ss.end()), vchSig))
+    if (!key.SignCompact(ss.GetHash(), vchSig))
     {
         ui->statusLabel_SM->setStyleSheet("QLabel { color: red; }");
         ui->statusLabel_SM->setText(QString("<nobr>") + tr("Message signing failed.") + QString("</nobr>"));
@@ -216,12 +216,12 @@ void SignVerifyMessageDialog::on_verifyMessageButton_VM_clicked()
         return;
     }
 
-    CDataStream ss(SER_GETHASH, 0);
+    CHashWriter ss(SER_GETHASH, 0);
     ss << strMessageMagic;
     ss << ui->messageIn_VM->document()->toPlainText().toStdString();
 
     CPubKey key;
-    if (!key.SetCompactSignature(Hash(ss.begin(), ss.end()), vchSig))
+    if (!key.SetCompactSignature(ss.GetHash(), vchSig))
     {
         ui->signatureIn_VM->setValid(false);
         ui->statusLabel_VM->setStyleSheet("QLabel { color: red; }");
-- 
1.7.1