Does Acrobat support KSP?

I have a question about SHA-256 signature in AcrobatX.

I tried SHA-256 electronic signature to a PDF file using Acrobat on Windows 7.

In Acrobat XI, I could create electronic signature with SHA-256 by KSP.

However, in Acrobat X, I received the following error.

(I use same signature mechanism.)

The Windows Cryptographic Service Provider reported an error:

  The keyset is not defined.

  Error Code 2148073497

Does Acrobat X support both CSP and KSP? or only CSP?

To careate electronic signature with SHA-256 by KSP in Acrobat X, SDK should be required?