Data encryption by RSA algorithm in Qt with public and private keys without binding to OpenSSL

RSA, Qt, шифрование в qt, private key, asynchronous encryption, ge, публичный и приватные ключи, AES, cryptography, crypto, QuasarApp, Public key, Qt-Sekret

Introduction

In this article there is a way how to organize message encryption, as well as use RSA (public and private keys) algorithms without libraries similar to OpenSSL, QCA or LibSodium.

How does it work?

Why is it necessary?

There are many encryption algorithms, most of them are based on an idea that in a message you've got there is a key to encrypt your message and send it to the recipient. It is assumed that the recipient has already got the encryption key so the recipient can decrypt it. However this method isn't usable in any case , because the encryption key should somehow sent the way nobody can intercept it,but this is almost impossible.

That's why nowadays the RSA encryption method using public and private key (asynchronous encryption) has become the most reliable and popular.

The working principle is the following:
As an example, we use the already established names of encryption participants: Alice and Bob.
Suppose Alice wants to send Bob a secret message, but doesn't want anyone else to see it.

  • Bob creates two keys for this operation: public and private.

  • Bob sends the public key to Alice.

  • Alice encrypts the message with the Bob’s public key.

  • Alice sends the encrypted message to Bob.

  • Bob decrypts Alice's message with a private key.

Eve, who wants to find out what Alice and Bob correspond with, intercepts all their messages. She cannot do anything with them, because she hasn't got their private keys, since in the RSA algorithm the encrypted message with key A (public key) can be decrypted only by its A1 pair (private key).
Thus, you can easily and conveniently protect the important information.

Description.

Qt-Secret is a simple library created by the QuasarApp group on Qt / qmake, the goal is to provide Basic encryption opportunities, which lack in the native Qt. Namely: RSA and AES algorithms.

Key features:

  • Generation of RSA64 and RSA128 key pairs (it is supposed to support quantity of numbers up to RSA2048)
  • Encryption and Decryption RSA.
  • Signature and message authentication.
  • AES key generation (AES64, AES128, AES256)
  • Encryption and Decryption AES

Working with Qt-Secret

Build the library and add it in a project using qmake

  • Open your repository
    cd yourRepo
  • Add Qt-Secret in your repository, for example, a submodule
    The git add submodule https://github.com/QuasarApp/Qt-Secret.git
  • Update your submodules

    git submodule update --init --recursive

  • Add your "pri" Qt-Secret library file in your "pro" file.

    include ($$PWD/Qt-Secret/src/Qt-Secret.pri)

  • Rebuild the project

The library is added in your project, now you can use it.

An example of using

Encrypting and decrypting messages.
#include <qrsaencryption.h> // Include the Qt-Secret library (RSA)

QByteArray pub, priv; // Create variables to keys.
QRSAEncryption e; // Create a variable to cryptographer

// Generate a pair of keys with a bit depth of 128
e.generatePairKey (pub, priv, QRSAEncryption :: Rsa :: RSA_128); // or QRSAEncryption :: Rsa :: RSA_64
QByteArray msg = "test message";


auto encodeData = e.encode (msg, pub); // encrypt the message with the public key
auto decodeData = e.decode (encodeData, priv); // decrypt with the private key

qDebug () << decodeData; // check in the message.



Signature and verification of message signature.
#include <qrsaencryption.h>

// Initialization
QByteArray pub, priv;
QRSAEncryption e;
e.generatePairKey (pub, priv, QRSAEncryption :: Rsa :: RSA_128); // or QRSAEncryption :: Rsa :: RSA_64

QByteArray msg = "test message";

auto signatureMessage = e.signMessage (msg, priv); // sign the message

if (e.checkSignMessage (signatureMessage, pub)) {// check the signature
// message signed successfully
}

Conclusion

This library is a good solution for simple encryption tasks.

  • easy to include;
  • easy to use.

It's good to use a pair of keys for one working session.

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Nov. 19, 2019, 2:10 p.m.
Pan

Здравствуйте. Спасибо за статью. Сделал перевод программы. Все работает. Только я делал не динамический, но это пока и не надо. Но с одной проблемой все же столкнулся. В прог…
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Nov. 19, 2019, 11:26 a.m.
vintorez10

Разобрался!!! Надо было не архив качать а exe файл и его уже распаковывать в нужную папку)))
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Nov. 19, 2019, 10:19 a.m.
vintorez10

Ребята а что если папки "Source" в архиве opencv нет? Скачал три варианта библиотеки ни в одном нет этой папки.
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Nov. 18, 2019, 6:27 a.m.
cyberaxe77

Моих знаний пока явно недостаточно, чтобы писать статьи. Так...небольшие заметки "на полях"))).
Nov. 18, 2019, 6:10 a.m.
Evgenij Legotskoj

Пока что на сайте нет активных пользователей PyQt5, кто бы мог писать статьи по PyQt5, к сожалению. Лично я только для статей пользуюсь этой библиотекой. Но можете стать одним из первых ;) Любой…
Now discuss on the forum
Nov. 19, 2019, 8:10 a.m.
Intruder

Михаил, добрый день. Без разницы в дизайнере создается форма или не в дизайнере. Как вы добавляете в QTabWidget? Нашел видеоурок и по нему все сделал. Все получилось. QtabWidg…
Nov. 19, 2019, 7:22 a.m.
Evgenij Legotskoj

Ну тогда создайте, пожалуйста, потом новую тему на форуме с тем кодом, а то мы с вами в оффтоп ушли, здесь немного не о том было обсуждение.
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BlinCT

Спасибо за идею. Сейчас попробою.
Nov. 19, 2019, 2:36 a.m.
BlinCT

Всем привет. Если кто дебажил qml часть подскажиет пожалуйста, какие настрйоки требуются в Qt Creator? Я собирал 5.12.5 из исходников, в Настройкс в debugger у меня выставлен путь к со…
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