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private_to_der

        # OpenSSL::PKey::PKey.private_to_der

(from ruby core)
### Implementation from PKey
---
    pkey.private_to_der                   -> string
    pkey.private_to_der(cipher, password) -> string

---

Serializes the private key to DER-encoded PKCS #8 format. If called
without arguments, unencrypted PKCS #8 PrivateKeyInfo format is used. If
called with a cipher name and a password, PKCS #8
EncryptedPrivateKeyInfo format with PBES2 encryption scheme is used.



      

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