Generates a new certificate.
procedure Generate(KeyBits: Integer);
Call this method to generate a new certificate based on the information
provided via Certificate, CACertificate, and CertificateRequest parameters as given below:
If neither CACertificate nor CertificateRequest are set, a self-signed certificate will be generated
based on the information set up in Certificate object.
If CACertificate is provided but CertificateRequest is not, a certificate signed by the CA certificate will be generated
based on the information configured in the Certificate object.
If both CACertificate and CertificateRequest are set, a certificate based on the certificate request and signed by the CA certificate will be generated.
The private key contained in the certificate request will be used.
KeyBits specifies the number of bits in the key to be generated. Note that this property is ignored in the case of request-based generation.