qt6 build

core/utils/CMakeLists.txt

@@ -0,0 +1,9 @@
+set(SOURCE_FILES
+    jammer.cpp
+)
+
+set(HEADER_FILES
+   jammer.h
+)
+
+target_sources(squawk PRIVATE ${SOURCE_FILES})

core/utils/jammer.cpp

@@ -0,0 +1,94 @@
+/*
+ * Squawk messenger.
+ * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "jammer.h"
+
+#include <memory>
+
+#include <openssl/evp.h>
+#include <openssl/err.h>
+
+struct CipherCtxDeleter {
+    void operator()(EVP_CIPHER_CTX* ctx) const {
+        EVP_CIPHER_CTX_free(ctx);
+    }
+};
+typedef std::unique_ptr<EVP_CIPHER_CTX, CipherCtxDeleter> CipherCtx;
+
+QString Core::Jammer::encrypt(const QString& plaintext, qint64 key) {
+    QByteArray encryptedData = process(plaintext.toUtf8(), intToKey(key), true);
+
+    return QString::fromUtf8(encryptedData.toHex());
+}
+
+QString Core::Jammer::decrypt(const QString& ciphertext, qint64 key) {
+    QByteArray encryptedData = QByteArray::fromHex(ciphertext.toUtf8());
+    QByteArray decryptedData = process(encryptedData, intToKey(key), false);
+
+    return QString::fromUtf8(decryptedData);
+}
+
+std::string Core::Jammer::getOpenSSLErrorString() {
+    unsigned long errCode = ERR_get_error();
+    if (errCode == 0) {
+        return "No OpenSSL error";
+    }
+    const char *errMsg = ERR_reason_error_string(errCode);
+    return errMsg ? std::string(errMsg) : "Unknown OpenSSL error";
+}
+
+QByteArray Core::Jammer::process(const QByteArray& input, const QByteArray& key, bool encrypt) {
+    CipherCtx ctx(EVP_CIPHER_CTX_new());
+    if (!ctx)
+        throw std::runtime_error("Failed to create password jammer context");
+
+    QByteArray output(input.size() + 16, 0);
+    int outputLength = 0;
+    int finalLength = 0;
+
+    if (!ctx)
+        throw std::runtime_error("Failed to create EVP_CIPHER_CTX: " + getOpenSSLErrorString());
+
+    if (EVP_CipherInit_ex(ctx.get(), EVP_chacha20(), nullptr, toUChar(key), nullptr, encrypt) != 1)
+        throw std::runtime_error("EVP_CipherInit_ex failed. " + getOpenSSLErrorString());
+
+    if (EVP_CipherUpdate(ctx.get(), toUChar(output), &outputLength, toUChar(input), input.size()) != 1)
+        throw std::runtime_error("EVP_CipherUpdate failed. " + getOpenSSLErrorString());
+
+    if (EVP_CipherFinal_ex(ctx.get(), toUChar(output) + outputLength, &finalLength) != 1)
+        throw std::runtime_error("EVP_CipherFinal_ex failed. " + getOpenSSLErrorString());
+
+    output.resize(outputLength + finalLength);
+
+    return output;
+}
+
+QByteArray Core::Jammer::intToKey(qint64 key, int keySize) {
+    QByteArray keyBytes(reinterpret_cast<const char *>(&key), sizeof(key));
+    while (keyBytes.size() < keySize)
+        keyBytes.append(keyBytes);
+
+    keyBytes.truncate(keySize);
+    return keyBytes;
+}
+
+unsigned char* Core::Jammer::toUChar(QByteArray& data) {
+    return reinterpret_cast<unsigned char *>(data.data());}
+
+const unsigned char* Core::Jammer::toUChar(const QByteArray& data) {
+    return reinterpret_cast<const unsigned char *>(data.constData());}

core/utils/jammer.h

@@ -0,0 +1,44 @@
+/*
+ * Squawk messenger.
+ * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdexcept>
+
+#include <QByteArray>
+#include <QString>
+
+namespace Core {
+
+class Jammer {
+public:
+    static QString encrypt(const QString& plaintext, qint64 key);
+    static QString decrypt(const QString& ciphertext, qint64 key);
+
+private:
+    Jammer() = delete;
+
+    static QByteArray process(const QByteArray& input, const QByteArray& key, bool encrypt);
+    static QByteArray intToKey(qint64 key, int keySize = 32);
+
+    static unsigned char* toUChar(QByteArray& data);
+    static const unsigned char* toUChar(const QByteArray& data);
+    static std::string getOpenSSLErrorString();
+};
+
+}