Modernize the X.509 example and make it more generic

Use 2048 bits for the private key.
Only the Unified Automation plugin supports private keys with password.
So the example should create a key that can be used by both plugins by default.

Change-Id: Ia46b345ff0666ae6dcf17a698934e6fb1ff7cce7
Pick-to: 6.5
Pick-to: 6.6
Reviewed-by: Frank Meerkoetter <frank.meerkoetter@basyskom.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/examples/opcua/x509/main.cpp b/examples/opcua/x509/main.cpp
index be42caf..eb421f4 100644
--- a/examples/opcua/x509/main.cpp
+++ b/examples/opcua/x509/main.cpp
@@ -16,10 +16,14 @@ int main(int argc, char **argv)
 
     // Generate RSA Key
     QOpcUaKeyPair key;
-    key.generateRsaKey(QOpcUaKeyPair::RsaKeyStrength::Bits1024);
+    key.generateRsaKey(QOpcUaKeyPair::RsaKeyStrength::Bits2048);
 
     // Save private key to file
-    QByteArray keyData = key.privateKeyToByteArray(QOpcUaKeyPair::Cipher::Aes128Cbc, "password");
+    QByteArray keyData = key.privateKeyToByteArray(QOpcUaKeyPair::Cipher::Unencrypted, QString());
+
+    // In order to create a private key file with password for the Unified Automation plugin,
+    // the following invocation can be used:
+    // QByteArray keyData = key.privateKeyToByteArray(QOpcUaKeyPair::Cipher::Aes128Cbc, "password");
 
     QFile keyFile("privateKey.pem");
     keyFile.open(QFile::WriteOnly);