I have problems signing with the PKCS # 12

When we want to use ".p12" or ".pfx" files to sign, Java has cryptographic power limitations. To avoid this problem, we should install the "unlimited strength policy":

https://cds.sun.com/is-bin/INTERSHOP.enfinity/WFS/CDS-CDS_Developer-Site/en_US/-/USD/ViewProductDetail-Start?ProductRef=jce_policy-6-oth-JPR@CDS-CDS_Developer

Another way to avoid this problem is to install our ".p12" file in Windows, and sign using Windows Crypto Api, as we explained in the manual.