VeriFone key injection
How to Generate RSA Keys in VSS verifone and compute public /CA?
As far as I know, it is not possible to generate a RSA keypair inside VSS (v4.0).
You might want to try generating a keypair using the embedded openssl and then store it into the key slot (beware that there are probably some constraints on some key slots (modulus length, exponent length) - check your documentation).
Beware that the RSACOMP operation does only a raw RSA computation (modular exponentiation) and you will have to handle the padding stuff yourself (and correctly).
A much simpler alternative is to generate the keypair outside (HSM?) and inject it securely to the terminal (I do not understand your use case - but some certificate for this keypair could be injected as well)
