Function openssl_sys::PEM_write_bio_ECPrivateKey

pub unsafe extern "C" fn PEM_write_bio_ECPrivateKey(
    bio: *mut BIO, 
    key: *mut EC_KEY, 
    cipher: *const EVP_CIPHER, 
    kstr: *mut c_uchar, 
    klen: c_int, 
    callback: Option<PasswordCallback>, 
    user_data: *mut c_void
) -> c_int