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    use std::io::{self, Read};

    mod aes_ctr;

    pub use self::aes_ctr::AesCtr;

    pub trait Encryption {
        fn encrypt(&mut self, data: &[u8], buf: &mut [u8]);
        fn decrypt(&mut self, data: &[u8], buf: &mut [u8]);
    }

    pub struct Decryptor<'a> {
        encryption: &'a mut Encryption,
        stream: &'a mut Read,
    }

    impl<'a> Decryptor<'a> {
        pub fn new(encryption: &'a mut Encryption, stream: &'a mut Read)
            -> Decryptor<'a> {
            Decryptor {
                encryption: encryption,
                stream: stream,
            }
        }
    }

    impl<'a> Read for Decryptor<'a> {
        fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
            let mut tmp = vec![0; buf.len()];
            let count = self.stream.read(tmp.as_mut_slice())?;
            self.encryption.decrypt(
                &tmp.as_slice()[0..count],
                &mut buf[0..count],
            );
            Ok(count)
        }
    }

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