On Wed, Mar 29, 2006, Nagy Zoltn Mrk wrote:
> Dear all
>
> I would like to create a data structure in C.
> Below you can see what I have created, but it doesn't work correctly.
> My question is: why doesn't initialised EVP_aes_128_cbc() into cipher?
>
> #define ORANGE 0xffa500
>
> struct ciphers_name
> {
> unsigned char *name;
> unsigned char *description;
> const EVP_CIPHER *cipher;
> unsigned int color;
> };
>
>
> struct ciphers_name ciphers[] =
> {
> { "aes128cbc","AES 128bit CBC",EVP_aes_128_cbc(),ORANGE}
> };
>
That wont work in many cases because you are trying to initialize the
structure with the return value from a function.
The initialization is done at compile time but that return value is only
available at runtime.
You have a couple of options. One is to change that definition to a function
pointer which you set to EVP_aes_128_cbc note *NOT* EVP_aes_128_cbc(). Then at
runtime you call that function pointer to get the EVP_CIPHER.
The alternative is to include something which you can lookup to get that
cipher. An example would be NID_aes_128_cbc which you can then lookup using
EVP_getcipherbynid().
Steve.
--
Dr Stephen N. Henson. Email, S/MIME and PGP keys: see homepage
OpenSSL project core developer and freelance consultant.
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