RSA: generating keys as PKCS#8 / X.509 strings, and decryption/encryption using such string as input

[Emanuele Quaglio]

Hello, I'd like to have some example on how to achieve the two goals I've written in the question: what I'm trying to do is having a c++ function that generates the keys and returns them as strings in ditto format, and two c++ functions for encrytpion and decryption that return the output as an hexadecimal string and take as input the string key as well. It would be very nice if I could even change (or at least know) the number of bits of the key generated. Thank you in advance for any help