pub unsafe extern "C" fn botan_privkey_export_encrypted_pbkdf_iter(
key: botan_privkey_t,
out: *mut u8,
out_len: *mut usize,
rng: botan_rng_t,
passphrase: *const c_char,
pbkdf_iterations: usize,
cipher_algo: *const c_char,
pbkdf_algo: *const c_char,
flags: u32
) -> c_int