Issue is fixed.
FYI-
As I am working on pre-boot, no OS is present. Which was resulting in no
seeding.
RAND_seed() has been called before using RAND_bytes().
Here is the code snippet.
static const char rnd_seed[] = "string to make the random number generator
think it has entropy";
RAND_seed(rnd_seed, sizeof rnd_seed);
On Tue, Aug 13, 2013 at 6:16 PM, baban devkate <baban...@gmail.com> wrote:
>
> FYI -
>
> RAND_bytes(buf, bytes) receives correct parameters as bytes=256 for
> SHA256.
>
>
> int RAND_bytes(unsigned char *buf, int num)
> {
> const RAND_METHOD *meth = RAND_get_rand_method();
> if (meth && meth->bytes)
> {
> Print(L" control is here\n");/////<---controll is here
> return meth->bytes(buf,num);
> }
> Print(L" RAND_bytes fails\n");
>
> return(-1);
> }
>
>
> On Tue, Aug 13, 2013 at 3:35 PM, baban devkate <baban...@gmail.com> wrote:
>
>> Hello,
>>
>> RAND_bytes() will use the proper OS-provided RNG e.g. /dev/urandom or
>> /dev/randomon Linux and CryptGenRandom() on Windows.
>>
>> I want to know how it works in Pre-boot environement?
>>
>> In pre-boot environment, if RAND_bytes() returns zero then what does it
>> mean?
>>
>> Is it because PRNG is not properly seeded? If yes, how to resolve it?
>>
>>
>> ~Baban
>>
>
>
