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    use crypto::aes::{KeySize, ctr};
    use crypto::symmetriccipher::SynchronousStreamCipher;

    use encryption::Encryption;

    pub struct AesCtr {
        cipher: Box<SynchronousStreamCipher + 'static>,
    }

    impl AesCtr {
        pub fn new(key: &[u8], iv: &[u8]) -> AesCtr {
            AesCtr { cipher: ctr(KeySize::KeySize256, key, &iv[0..16]) }
        }
    }

    impl Encryption for AesCtr {
        fn encrypt(&mut self, data: &[u8], buf: &mut [u8]) {
            self.cipher.process(data, buf);
        }

        fn decrypt(&mut self, data: &[u8], buf: &mut [u8]) {
            self.cipher.process(data, buf);
        }
    }

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