On Wed, Aug 8, 2012 at 1:10 PM, exocoder
<exocoder@gmail.com> wrote:
Thank you for the info Neil,
I am looking at the example that you pointed to, need to get my head around the issues of
initialising/closing OpenSSL in the filter. It seems that every OpenSSL example uses a different
interface :(
Cheers,
Will
Again Thank you for the advice.
On Mon, 2012-08-06 at 15:40 -0600, Neil Nelson wrote:
> exocoder,
>
> Upon just reading the docs at
>
> http://www.boost.org/doc/libs/1_50_0/libs/iostreams/doc/index.html
>
> and particularly
>
> 2.2.8. Multi-Character Filters
>
> It looks like you could take the code from the following page
>
> http://stackoverflow.com/questions/1007337/encrypting-and-decrypting-a-small-file-using-openssl
>
> with the critical line being
>
> AES_cfb128_encrypt(indata, outdata, bytes_read, &key, ivec, &num,
> AES_ENCRYPT);
>
> that reads and writes to memory buffers. Two other aspects are: (1)
> software using encryption is export restricted and you can research that
> if needed for your application, (2) key management is likely the more
> complicated part, and (3) use of initialization vectors (added random
> bytes at the beginning of the input data).
>
> Neil Nelson
>
> > I am currently looking at using OpenSSL to write information to an
> > encrypted file on-the-fly so to speak. I have been researching my
> > options for doing this, and have come across the Boost.Iostream library,
> > which promises to be a very elegant solution (The documentation even
> > suggests that filters can be written to provide encryption/decryption
> > using OpenSSL).
> > It would seem that my best approach would be to use the BIO_f* interface
> > to encrypt a memory buffer, which could be written by overloading
> > write(). However the OpenSSL documentation is particularly sparse when
> > it comes to file/memory encryption and I would appreciate any advice on
> > how to do this.
> > Thank you in advance for any help proffered.
>
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