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    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    use buffer::{BufferResult, RefReadBuffer, RefWriteBuffer};
    use cryptoutil::symm_enc_or_dec;

    pub trait BlockEncryptor {
        fn block_size(&self) -> usize;
        fn encrypt_block(&self, input: &[u8], output: &mut [u8]);
    }

    pub trait BlockEncryptorX8 {
        fn block_size(&self) -> usize;
        fn encrypt_block_x8(&self, input: &[u8], output: &mut [u8]);
    }

    pub trait BlockDecryptor {
        fn block_size(&self) -> usize;
        fn decrypt_block(&self, input: &[u8], output: &mut [u8]);
    }

    pub trait BlockDecryptorX8 {
        fn block_size(&self) -> usize;
        fn decrypt_block_x8(&self, input: &[u8], output: &mut [u8]);
    }

    #[derive(Debug, Clone, Copy)]
    pub enum SymmetricCipherError {
        InvalidLength,
        InvalidPadding
    }

    pub trait Encryptor {
        fn encrypt(&mut self, input: &mut RefReadBuffer, output: &mut RefWriteBuffer, eof: bool)
            -> Result<BufferResult, SymmetricCipherError>;
    }

    pub trait Decryptor {
        fn decrypt(&mut self, input: &mut RefReadBuffer, output: &mut RefWriteBuffer, eof: bool)
            -> Result<BufferResult, SymmetricCipherError>;
    }

    pub trait SynchronousStreamCipher {
        fn process(&mut self, input: &[u8], output: &mut [u8]);
    }

    // TODO - Its a bit unclear to me why this is necessary
    impl SynchronousStreamCipher for Box<SynchronousStreamCipher + 'static> {
        fn process(&mut self, input: &[u8], output: &mut [u8]) {
            let me = &mut **self;
            me.process(input, output);
        }
    }

    impl Encryptor for Box<SynchronousStreamCipher + 'static> {
        fn encrypt(&mut self, input: &mut RefReadBuffer, output: &mut RefWriteBuffer, _: bool)
                -> Result<BufferResult, SymmetricCipherError> {
            symm_enc_or_dec(self, input, output)
        }
    }

    impl Decryptor for Box<SynchronousStreamCipher + 'static> {
        fn decrypt(&mut self, input: &mut RefReadBuffer, output: &mut RefWriteBuffer, _: bool)
                -> Result<BufferResult, SymmetricCipherError> {
            symm_enc_or_dec(self, input, output)
        }
    }

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