I want to verify a RSA signature. I have data to verify, the signature and a public key in a form of modulus and exponent. I'd like to do the verification using openssl. Is it possible? I know I can use openssl rsautl -verify -in sig -inkey key.pem but I don't know how (using openssl) to create a public key having just it's modulus and exponent.
Maybe other ideas how to check this signature (except writing some programs)?