QSslKey: Unsupported encryption cipher OID: "2.16.840.1.101.3.4.1.42"

i.sorochan

Hello everyone

I have updated Qt from 6.7.2 to 6.7.3 and got an issue with websockets.

I am using the next code

        QFile certFile("1.pem");
        QFile keyFile("1.key");
        QFile CAFile("1-ca.pem");
        certFile.open(QIODevice::ReadOnly);
        keyFile.open(QIODevice::ReadOnly);
        CAFile.open(QIODevice::ReadOnly);
        QSslCertificate certificate(&certFile, QSsl::Pem);
        QSslCertificate CAcertificate(&CAFile, QSsl::Pem);
        QSslKey sslKey(&keyFile, QSsl::Rsa, QSsl::Pem, QSsl::PrivateKey, "123456789");
        sslConfiguration.setPeerVerifyMode(QSslSocket::VerifyNone);
        sslConfiguration.setLocalCertificate(certificate);
        sslConfiguration.setPrivateKey(sslKey);
        sslConfiguration.addCaCertificate(CAcertificate);
        webSocket.setSslConfiguration(sslConfiguration);
        webSocket.open("wss_url");

and after the update, I got the error:

QSslKey: Unsupported encryption cipher OID: "2.16.840.1.101.3.4.1.42"
File a bug report to Qt (include the line above).
Cannot provide a certificate with no key

I'm using msvc2022_64 and MSBuild version 17.11.9+a69bbaaf5
p.s with 6.8.0 and 6.8.1 same behavior

Christian Ehrlicher

@i-sorochan said in QSslKey: Unsupported encryption cipher OID: "2.16.840.1.101.3.4.1.42":

File a bug report to Qt (include the line above).

And the solution is already given in the error message.

ChrisW67

You really should check that your various QFile open calls succeeded. QSslKey may be the one complaining, but your certificates may be null.