Hello everyone! I hope you're all doing well.

I'm struggling to digitally sign a pdf document for more time then I would like 
and any help here is appreciated.

I'm using a USB Token (StarSign Crypto USB Token S) and the proprietary .dll 
available to load the keystore.
I can get the available info from the token, but whenever I try to sign a pdf 
using the <CreateSignature> class, I get the following exception:

<<org.bouncycastle.operator.OperatorCreationException: cannot create signer: No 
installed provider supports this key: sun.security.pkcs11.P11Key$P11PrivateKey>>

I've done some research but I couldn't find any resource to overcome this 
problem using PDF Box, which is the library I'd like to use because of its 
license.

If can be of any help, I'm also posting the code I've used:

https://gist.github.com/benywolf42/f5784671301478dd3e2cf803eb6ef8d5

Thanks in advance and be safe!

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