Merge pull request #906 from sje397/ValidateMessage

Add a menu option and dialog to verify a signed message

1 files changed, 75 insertions, 0 deletions

diff --git a/src/qt/verifymessagedialog.cpp b/src/qt/verifymessagedialog.cpp
new file mode 100644
index 000000000..884290871
--- /dev/null
+++ b/src/qt/verifymessagedialog.cpp
@@ -0,0 +1,75 @@
+#include "verifymessagedialog.h"
+#include "ui_verifymessagedialog.h"
+
+#include <string>
+#include <vector>
+
+#include <QDialogButtonBox>
+#include <QAbstractButton>
+#include <QClipboard>
+#include <QMessageBox>
+
+#include "main.h"
+#include "wallet.h"
+#include "walletmodel.h"
+#include "addresstablemodel.h"
+#include "guiutil.h"
+
+VerifyMessageDialog::VerifyMessageDialog(AddressTableModel *addressModel, QWidget *parent) :
+    QDialog(parent),
+    ui(new Ui::VerifyMessageDialog),
+    model(addressModel)
+{
+    ui->setupUi(this);
+
+    GUIUtil::setupAddressWidget(ui->lnAddress, this);
+}
+
+VerifyMessageDialog::~VerifyMessageDialog()
+{
+    delete ui;
+}
+
+bool VerifyMessageDialog::checkAddress()
+{
+    CDataStream ss(SER_GETHASH, 0);
+    ss << strMessageMagic;
+    ss << ui->edMessage->document()->toPlainText().toStdString();
+    uint256 hash = Hash(ss.begin(), ss.end());
+
+    bool invalid = true;
+    std::vector<unsigned char> vchSig = DecodeBase64(ui->lnSig->text().toStdString().c_str(), &invalid);
+
+    if(invalid)
+    {
+        QMessageBox::warning(this, tr("Invalid Signature"), tr("The signature could not be decoded. Please check the signature and try again."));
+        return false;
+    }
+
+    CKey key;
+    if(!key.SetCompactSignature(hash, vchSig))
+    {
+        QMessageBox::warning(this, tr("Invalid Signature"), tr("The signature did not match the message digest. Please check the signature and try again."));
+        return false;
+    }
+
+    CBitcoinAddress address(key.GetPubKey());
+    QString qStringAddress = QString::fromStdString(address.ToString());
+    ui->lnAddress->setText(qStringAddress);
+    ui->copyToClipboard->setEnabled(true);
+
+    QString label = model->labelForAddress(qStringAddress);
+    ui->lblStatus->setText(label.isEmpty() ? tr("Address not found in address book.") : tr("Address found in address book: %1").arg(label));
+    return true;
+}
+
+void VerifyMessageDialog::on_buttonBox_clicked(QAbstractButton *button)
+{
+    if(ui->buttonBox->buttonRole(button) == QDialogButtonBox::ApplyRole)
+        checkAddress();
+}
+
+void VerifyMessageDialog::on_copyToClipboard_clicked()
+{
+    QApplication::clipboard()->setText(ui->lnAddress->text());
+}