extern "C" {
    fn chacha20_cbc_encrypt(
        input: *const u8,
        output: *mut u8,
        in_len: usize,
        key: *const u8,
        ivec: *mut u8,
    );
}

pub fn chacha_cbc_encrypt(input: &[u8], output: &mut [u8], key: &[u8], ivec: &mut [u8]) {
    unsafe {
        chacha20_cbc_encrypt(
            input.as_ptr(),
            output.as_mut_ptr(),
            input.len(),
            key.as_ptr(),
            ivec.as_mut_ptr(),
        );
    }
}