Function openssl_sys::PEM_write_bio_RSAPrivateKey

pub unsafe extern fn PEM_write_bio_RSAPrivateKey(bp: *mut BIO,
                                                 rsa: *mut RSA,
                                                 cipher: *const EVP_CIPHER,
                                                 kstr: *mut c_uchar,
                                                 klen: c_int,
                                                 callback: Option<PasswordCallback>,
                                                 user_data: *mut c_void)
                                                 -> c_int