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to_pem 

        # OpenSSL::PKey::RSA.to_pem

(from ruby core)
### Implementation from RSA
---
    to_pem(*args)

---

Outputs this keypair in PEM encoding.  If *cipher* and *pass_phrase* are
given they will be used to encrypt the key.  *cipher* must be an
OpenSSL::Cipher instance.


(This method is an alias for OpenSSL::PKey::RSA#export.)

Outputs this keypair in PEM encoding.  If *cipher* and *pass_phrase* are
given they will be used to encrypt the key.  *cipher* must be an
OpenSSL::Cipher instance.

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