Sign data using PKCS #7 in JAVA

Question

I want to sign a text file (may be a .exe file or something else in the future) using PKCS#7 and verify the signature using Java.

1. What do I need

Answer 1

PKCS#7 is known as CMS now (Cryptographic Message Syntax), and you will need the Bouncy Castle PKIX libraries to create one. It has ample documentation and a well established mailing list.

I won't supply code snippet, it is against house rules. Try yourself first.