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public_key 

        # OpenSSL::PKey::RSA.public_key

(from ruby core)
### Implementation from RSA
---
    rsa.public_key -> rsanew

---

Returns a new RSA instance that carries just the public key components.

This method is provided for backwards compatibility. In most cases,
there is no need to call this method.

For the purpose of serializing the public key, to PEM or DER encoding of
X.509 SubjectPublicKeyInfo format, check PKey#public_to_pem and
PKey#public_to_der.

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