Function libsodium_sys::crypto_kdf_derive_from_key

pub unsafe extern "C" fn crypto_kdf_derive_from_key(
    subkey: *mut c_uchar, 
    subkey_len: usize, 
    subkey_id: u64, 
    ctx: *const c_char, 
    key: *const c_uchar
) -> c_int