What is the difference between acrobat X and acrobat XI in signatures and verification?

Hello,

I have wrote a plugin to with acrobat SDK.  It can be signed with certificate and verified in acrobat 9 or acrobat X, but can't be successfully verified in acrobat XI.

And I get the error message like"An error occurred whilesignature verification.  Signaturedigest algorithmis unknown.".

Now I want to declare the following points:

1. The procedure of signature and verification is what I implemented.
2. It can be signed with certificate in acrobat XI, but can't be verified.
3. If I chose the RSA certificates to sign and verify, it would be work very well in all acrobat versions.But when I chose the SM2 certificates, it would be failed to verify in acorbat XI.
4. I have try to debug to find this bug, and I setted a breakpoints in PubSecHandlerRec::sigValidate. At last, I found that the process of PubSecHandlerRec::sigValidate in acrobat XI didn't execute.

Obviously I use my plugin to sign and verify successfully in acrobat 9 and acrobat X, but not in acrobat XI. So I want to ask the question: "What is the difference between acrobat X and acrobat XI in signatures and verification?".

Thanks for any help.