Use CA certificate my own code

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I have searched on several topic but i' don't really find what i need. The problem is : I'd like to sign file with digital certificate from my own writted program (desktop or web). Then I want to know: 1) if i can do that with CA certificate. 2) Which CA can issue me certificate i can use in my program. I mean CA certificate file with method to acces to Algorithm, Key, and also to send verification request to server? A kind of API? 3) Does this kind of certificate exist ? Can i found it for free?

asked 31 secs ago

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Use CA certificate my own code