How to implement importing public keys into RSA··

My go rsa encrypt /decrypt like:

how to implement with using cryptography?
```
func Encrypt(pub *rsa.PublicKey, data []byte) ([]byte, error) {
	hash := sha256.New()

	return rsa.EncryptOAEP(hash, rand.Reader, pub, data, nil)
}

func Decrypt(priv *rsa.PrivateKey, ciphertext []byte) ([]byte, error) {
	hash := sha256.New()

	return rsa.DecryptOAEP(hash, rand.Reader, priv, ciphertext, nil)
}

``