I need to encrypt and decrypt using RSA

[Jaime Viz�n Gonz�lez]

Hi!   can anyone help me?   I have got a X509 certificate, in BER format, from smartcard. I need to encrypt a random numbre using the public key, which is stored in thar certificate. After, I want to decrypt that number. And this is my problem:   1) How can I get the public key from certficate? 2) How can I get the private key from certificate? 3) How can I encrypt and decrypt a random number using RSA?   Thanks