secret-service 0.2.0

Library to interface with Secret Service API
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//Copyright 2016 secret-service-rs Developers
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://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.

// Contains encryption and decryption using aes.
// Could also contain setting aes key

use crypto::{ buffer, aes, blockmodes };
use crypto::buffer::{ ReadBuffer, WriteBuffer, BufferResult };

//use rand::{ Rng, OsRng };

pub fn encrypt(data: &[u8], key: &[u8], iv: &[u8]) -> ::Result<Vec<u8>> {
    let mut encryptor = aes::cbc_encryptor(
        aes::KeySize::KeySize128,
        key,
        iv,
        blockmodes::PkcsPadding);

    let mut final_result = Vec::<u8>::new();
    let mut read_buffer = buffer::RefReadBuffer::new(data);
    let mut buffer = [0; 2048]; // 4096 in example implementation with keysize 256
    let mut write_buffer = buffer::RefWriteBuffer::new(&mut buffer);

    loop {
        let result = try!(encryptor.encrypt(&mut read_buffer, &mut write_buffer, true));
        final_result.extend(write_buffer.take_read_buffer().take_remaining().iter().cloned());

        match result {
            BufferResult::BufferUnderflow => break,
            BufferResult::BufferOverflow => { },
        }
    }
    Ok(final_result)
}

pub fn decrypt(encrypted_data: &[u8], key: &[u8], iv: &[u8]) -> ::Result<Vec<u8>> {
    let mut decryptor = aes::cbc_decryptor(
        aes::KeySize::KeySize128,
        key,
        iv,
        blockmodes::PkcsPadding);

    let mut final_result = Vec::<u8>::new();
    let mut read_buffer = buffer::RefReadBuffer::new(encrypted_data);
    let mut buffer = [0; 2048]; // 4096 in example implementation with keysize 256
    let mut write_buffer = buffer::RefWriteBuffer::new(&mut buffer);

    loop {
        let result = try!(decryptor.decrypt(&mut read_buffer, &mut write_buffer, true));
        final_result.extend(write_buffer.take_read_buffer().take_remaining().iter().cloned());

        match result {
            BufferResult::BufferUnderflow => break,
            BufferResult::BufferOverflow => { },
        }
    }
    Ok(final_result)
}