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I have an application that still uses Openssl 1.1.1w. I need to update that to an OpenSsl 3 version. Switching to Qt6 seems like the best way to do that, however due to the nature of the codebase we need to work with Qt 5.15 for a while yet.

According to the follwing forum thread and bugreport, Qt supports Openssl 3 from Qt 5.15.13 onwards.

https://forum.qt.io/topic/136960/does-qt-5-15-support-openssl-3-x/21

https://bugreports.qt.io/browse/QTBUG-107729

I tried replacing the libcrypto-1_1-x64.dll and libssl-1_1-x64.dll in the build dir with their Openssl 3 counterparts. This got the following result:

bool hasSslSupport = QSslSocket::supportsSsl(); // false
QString sslLibVersion = QSslSocket::sslLibraryVersionString(); // "" empty string
QString sslLibBuildVersion = QSslSocket::sslLibraryBuildVersionString(); // "OpenSSL 1.1.1m 14 Dec 2021"

The Openssl 3 libs are not recognized. Did I misunderstand what it means for Qt 5.15 to have support for Openssl? What could I do to make this work?

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  • 1
    For Qt to support SSL the version of OpenSSL that Qt was built with sslLibraryBuildVersionString has to be compatible with OpenSSL version linked in runtime sslLibraryVersionString. So, if your sslLibraryVersionString is empty, apparently you didn't link with openssl libraries at all, and you should. Commented Nov 5 at 11:09
  • 7
    Qt supports OpenSSL 3 from Qt 5.15.13, this likely means that Qt can be built and linked with OpenSSL 3. If it is not built so, it can't use OpenSSL 3. Commented Nov 5 at 11:11
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