AN159: Implement Curve25519 public, private key and shared secret

Change-Id: I2c6a1f0d687d6f24983b0731a3b0c9bc15e561c6
Reviewed-by: Karsten Heimrich <karsten.heimrich@qt.io>

1 files changed, 98 insertions, 0 deletions

diff --git a/src/knx/ssl/qknxcurve25519.h b/src/knx/ssl/qknxcurve25519.h
new file mode 100644
index 0000000..864c842
--- /dev/null
+++ b/src/knx/ssl/qknxcurve25519.h
@@ -0,0 +1,98 @@
+/******************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtKnx module.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 or (at your option) any later version
+** approved by the KDE Free Qt Foundation. The licenses are as published by
+** the Free Software Foundation and appearing in the file LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+******************************************************************************/
+
+#ifndef QKNXCURVE25519_H
+#define QKNXCURVE25519_H
+
+#include <QtCore/qshareddata.h>
+
+#include <QtKnx/qknxbytearray.h>
+#include <QtKnx/qtknxglobal.h>
+
+QT_BEGIN_NAMESPACE
+
+class QKnxCurve25519KeyData;
+class QKnxCurve25519PrivateKey;
+
+class Q_KNX_EXPORT QKnxCurve25519PublicKey final
+{
+public:
+    QKnxCurve25519PublicKey();
+    ~QKnxCurve25519PublicKey();
+
+    QKnxCurve25519PublicKey(const QKnxCurve25519PrivateKey &key);
+
+    bool isNull() const;
+    bool isValid() const;
+
+    QKnxByteArray bytes() const;
+    static QKnxCurve25519PublicKey fromBytes(const QKnxByteArray &data, quint16 index = 0);
+
+    QKnxCurve25519PublicKey(const QKnxCurve25519PublicKey &other);
+    QKnxCurve25519PublicKey &operator=(const QKnxCurve25519PublicKey &other);
+
+private:
+    friend class QKnxCryptographicEngine;
+    QSharedDataPointer<QKnxCurve25519KeyData> d_ptr;
+};
+
+class Q_KNX_EXPORT QKnxCurve25519PrivateKey final
+{
+public:
+    QKnxCurve25519PrivateKey();
+    ~QKnxCurve25519PrivateKey();
+
+    bool isNull() const;
+    bool isValid() const;
+
+    QKnxByteArray bytes() const;
+    static QKnxCurve25519PrivateKey fromBytes(const QKnxByteArray &data, quint16 index = 0);
+
+    QKnxCurve25519PrivateKey(const QKnxCurve25519PrivateKey &other);
+    QKnxCurve25519PrivateKey &operator=(const QKnxCurve25519PrivateKey &other);
+
+private:
+    friend class QKnxCurve25519PublicKey;
+    friend class QKnxCryptographicEngine;
+    QSharedDataPointer<QKnxCurve25519KeyData> d_ptr;
+};
+
+class Q_KNX_EXPORT QKnxCryptographicEngine final
+{
+public:
+    QKnxCryptographicEngine() = delete;
+    ~QKnxCryptographicEngine() = default;
+
+    static QKnxByteArray sharedSecret(const QKnxCurve25519PublicKey &pub,
+                                      const QKnxCurve25519PrivateKey &priv);
+};
+
+QT_END_NAMESPACE
+
+#endif