Does Qt support RSA encryption?

Question

Does Qt support rsa encryption,QSslkey seems doesn't work. thanks in advance.

Answer 1

Qt supports RSA for SSL-connections. There are no interfaces to use RSA keys directly.

You could take a look at the Qt Cryptographic Architecture project, but it does not look to be maintained anymore.

Answer 2

Qt is supporting RSA encryption. You have to indicate to QSslKey the correct algorithm used: http://doc.qt.io/qt-5/qssl.html#KeyAlgorithm-enum

Answer 3

If you want encrypt data without ssl dependencies then you can use my library Qt-Secret. This library supports the qmake build system, which makes it very easy to connect to your project.

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For example:

Build

• git clone 'https://github.com/QuasarApp/Qt-Secret.git'
  cd Qt-Secret
  git submodule update --init --recursive
  qmake -r 
  make -j8
  make test #(for testing)
  

Include

For qmake projects

• cd yourRepo
  git submodule add https://github.com/QuasarApp/Qt-Secret.git # add the repository of Qt-Secret into your repo like submodule
  git submodule update --init --update
  

• Include in your pro file the pri file of Qt-Secret library:

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

• Rebuild your project.

For other build systems

• cd yourRepo
  git submodule add https://github.com/QuasarApp/Qt-Secret.git # add the repository of Qt-Secret into your repo like submodule
  git submodule update --init --update
  

• Add the rule to build Qt-Secret.

• Add INCLUDEPATH and LIBS for your build system .
• Rebuild your project.

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Usage

RSA

Encryption and decryption of messages.

#include <qrsaencryption.h>

    QByteArray pub, priv;
    QRSAEncryption e(QRSAEncryption::Rsa::RSA_2048);
    e.generatePairKey(pub, priv);
    QByteArray msg = "test message";

    auto encodeData = e.encode(msg, pub);
    auto decodeData = e.decode(encodeData, priv);

Signature and verification of the message signature.

#include <qrsaencryption.h>

    QByteArray pub, priv;
    QRSAEncryption e;
    e.generatePairKey(pub, priv, QRSAEncryption::Rsa::RSA_128); // or other rsa size 

    QByteArray msg = "test message";

    auto signedMessage = e.signMessage(msg, priv);

    if (e.checkSignMessage(signedMessage, pub)) {
        // message signed success
    }