Add file encryption functions and Encryption/DecryptionDevice

The devices allow it to encrypt or decrypt data on the fly when reading
or writing data.

1 files changed, 107 insertions, 0 deletions

diff --git a/tests/qxmppfileencryption/tst_qxmppfileencryption.cpp b/tests/qxmppfileencryption/tst_qxmppfileencryption.cpp
new file mode 100644
index 00000000..dec935f3
--- /dev/null
+++ b/tests/qxmppfileencryption/tst_qxmppfileencryption.cpp
@@ -0,0 +1,107 @@
+// SPDX-FileCopyrightText: 2022 Linus Jahn <lnj@kaidan.im>
+//
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+#include "QXmppFileEncryption.h"
+
+#include "QcaInitializer_p.h"
+#include <QtTest>
+
+using namespace QXmpp;
+using namespace QXmpp::Private;
+using namespace QXmpp::Private::Encryption;
+
+class tst_QXmppFileEncryption : public QObject
+{
+    Q_OBJECT
+
+private:
+    Q_SLOT void basic();
+    Q_SLOT void deviceEncrypt();
+    Q_SLOT void deviceDecrypt();
+    Q_SLOT void paddingSize();
+};
+
+void tst_QXmppFileEncryption::basic()
+{
+    QcaInitializer encInit;
+
+    QByteArray data =
+        "This is an example text message";
+    QByteArray key = "12345678901234567890123456789012";
+    QByteArray iv = "data";
+
+    auto encrypted = process(data, Aes256CbcPkcs7, Encode, key, iv);
+    qDebug() << data.size() << "->" << encrypted.size();
+    auto decrypted = process(encrypted, Aes256CbcPkcs7, Decode, key, iv);
+    QCOMPARE(decrypted, data);
+}
+
+void tst_QXmppFileEncryption::deviceEncrypt()
+{
+    QcaInitializer encInit;
+
+    QByteArray data =
+        "v2qtI8tx5DxM6axUAZ+xsEwrtb0VYafAPlMWqpVMG+5PBE5wbZ7MZhDUEIdFkxchOIJqt";
+    QByteArray key = "12345678901234567890123456789012";
+    QByteArray iv = "12345678901234567890123456789012";
+
+    auto buffer = std::make_unique<QBuffer>(&data);
+    buffer->open(QIODevice::ReadOnly);
+
+    EncryptionDevice encDev(std::move(buffer), Aes256CbcPkcs7, key, iv);
+
+    auto encrypted = encDev.readAll();
+
+    auto decrypted = process(encrypted, Aes256CbcPkcs7, Decode, key, iv);
+    QCOMPARE(decrypted, data);
+}
+
+void tst_QXmppFileEncryption::deviceDecrypt()
+{
+    QcaInitializer encInit;
+
+    QByteArray data =
+        "v2qtI8tx5DxM6axUAZ+xsEwrtb0VYafAPlMWqpVMG+5PBE5wbZ7MZhDUEIdFkxchOIJqt";
+    QByteArray key = "12345678901234567890123456789012";
+    QByteArray iv = "12345678901234567890123456789012";
+
+    auto encrypted = process(data, Aes256CbcPkcs7, Encode, key, iv);
+
+    QByteArray decrypted;
+    auto buffer = std::make_unique<QBuffer>(&decrypted);
+    buffer->open(QIODevice::WriteOnly);
+
+    DecryptionDevice decDev(std::move(buffer), Aes256CbcPkcs7, key, iv);
+    decDev.write(encrypted);
+
+    QCOMPARE(decrypted, data);
+}
+
+void tst_QXmppFileEncryption::paddingSize()
+{
+    constexpr auto MAX_BYTES_TEST = 1024;
+
+    QcaInitializer encInit;
+
+    QByteArray key = "12345678901234567890123456789012";
+    QByteArray iv = "12345678901234567890123456789012";
+
+    for (int i = 1; i <= MAX_BYTES_TEST; i++) {
+        QByteArray data(i, 'a');
+        auto buffer = std::make_unique<QBuffer>(&data);
+        buffer->open(QIODevice::ReadOnly);
+
+        EncryptionDevice encDev(std::move(buffer), Aes256CbcPkcs7, key, iv);
+        auto reportedSize = encDev.size();
+        auto encryptedData = encDev.readAll();
+
+        QCOMPARE(reportedSize, encryptedData.size());
+
+        auto decryptedData = process(encryptedData, Aes256CbcPkcs7, Decode, key, iv);
+        QCOMPARE(decryptedData, data);
+    }
+}
+
+QTEST_MAIN(tst_QXmppFileEncryption)
+#include "tst_qxmppfileencryption.moc"