Created attachment 37476 [details]
My Solution of the Problem

Hello,

I need to test an HTTP Endpoint, that requires the use of eliptic-curve algorithms (i.e. brainPool256r1), but these curves are not supported by the jvm. To make this possible it is required to install additional security proivders (in my case: BouncyCastleProvider and BouncyCastleJsseProvider).

My problem is: the BouncyCastleJsseProvider needs to be configured to use the BouncyCastleProvider ( new BouncyCastleJsseProvider("BC") ).

I tried these ways, but this won't work:
1.) Adding these SecurityProvider to the java config file (java.security) - here I can add a security provider, but I can't configure it.
2.) Create a plugin that installs these at Test-Start (via the TestStateListener-Interface)

Than I tried this (and this is working):

I add the Security-Provider as soon a possible in the startup of JMeter - direct in the Method: start() of org.apache.jmeter.JMeter (Module: core) - And this is working.

But I do not know if this is the best place to add...

I attach you my version of the JMeter.java file.
My changes:

the two functions:
  private void addSecurityProvider(Properties properties)
  private void addSecurityProvider(String securityProviderConfig)
 
and the call of the first method in the start-method (line:560 - direct after initializeProperties(parser))

The usage is:
With these changes you could add a security-provider by adding jmeter-properties (security.provider and security.provider.x) to the command line. The format of the property-value musst be: <full qualified classname>:<position>:<config-string>
full qualified classname: The full qualifiedname of the SecurityProviderClass
position: The position of the SecurityProvider in the SecurityProviderList (Security.insertProviderAt(provider,position)
conifg: if present the Constructor with one String argument will be called and this will be given as argument. (As fallback the default constructor will be used)

jmeter -J security.provider.2="org.bouncycastle.jsse.provider.BouncyCastleJsseProvider:2:BC" -J security.provider="org.bouncycastle.jce.provider.BouncyCastleProvider:1"

The provider will be installed in order of the propertynames (security.provider,security.provider.1,security.provider.2,...)