Thanks everybody!!
I've tried something thats it's very easy. I've type the following
code:
struct c c1;
//...
//I fill the strct c1...
//...
char info[sizeof(c1)];
memcpy (info, &c1, sizeof(c1));
string info_msg = c1;
And now, I sign the string info_msg and verify the signature and
everything works fine!
Thanks for your ideas!
On 9 dic, 05:23, Geoff Beier <[email protected]> wrote:
> On Mon, Dec 7, 2009 at 06:35, Charlie <[email protected]> wrote:
> > Hi!
>
> > I know how to sign a string with crypto++, but, how can I sign a C
> > struct, for example, the next struct?
>
> > struct c
> > {
> > double x;
> > double y;
> > int z;
> > };
>
> You need to serialize your structure first, then sign/verify your
> serialized representation. There are a few common ways to do this. Two
> good ones are boost::serialziation and ASN1. Whichever way you do it,
> once you settle on a serialization format, it's just a matter of
> signing the bytes that are emitted by your serializer and verifying
> the bytes before you feed them to your deserializer.
>
> If you just use the in-memory representation of your native struct, it
> won't be portable across compilers/runtimes/platforms, as others have
> noted.
>
> FWIW, the most common standards that need to do this use ASN.1 to
> specify the structure and the Distinguished Encoding Rules (DER) to
> encode/decode it.
>
> There's a very good commercial ASN.1 compiler/library
> here:http://www.obj-sys.com/products_asn1c.shtml
>
> You can get free ASN.1 compilers/libraries
> here:http://code.google.com/p/a2c/http://lionet.info/asn1c/
>
> Boost serialization + documentation live
> here:http://www.boost.org/doc/libs/1_41_0/libs/serialization/doc/index.html
>
> You could naturally roll your own, also. The main thing is that the
> serialized representation needs to be the same across all the versions
> of the compilers/runtimes you care about. Unless your project is
> really trivial, I'd go with one of the above. If you only need to
> interoperate with different versions of your own code (albeit possibly
> across different platforms/versions of your compiler/runtime) I'd use
> boost. It's certainly easiest. If you need to interoperate with
> multiple independent implementations of your format, ASN1 is worth the
> learning curve IMO.
>
> HTH,
>
> Geoff
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