On Tue, Mar 16, 2010 at 6:25 PM, Dr. Stephen Henson <[email protected]> wrote:
> On Tue, Mar 16, 2010, Mathieu Malaterre wrote:
>
>> Hi there,
>>
>> I am looking at an old piece of code:
>>
>> http://cpansearch.perl.org/src/SAMPO/smime-0.7/smimeutil.c
>>
>> ...
>> #ifdef WINDOWS
>> LOG_PRINT("RAND_screen...");
>> RAND_screen(); /* Loading video display memory into random state */
>> #endif
>> ...
>>
>> And I was wondering why RAND_screen was being called only on windows ?
>>
>
> It was used at one point for PRNG seeding. Now OpenSSL gathers entropy from a
> number of OS specific sources and doesn't need the explicit call any more.
What do you mean 'doesn't anymore' ? I am looking at openssl 0.9.8m
and it reveal:
cat ./apps/smime.c
...
else if (operation == SMIME_ENCRYPT)
{
...
need_rand = 1;
}
...
if (need_rand)
{
app_RAND_load_file(NULL, bio_err, (inrand != NULL));
...
which in turn:
cat apps/app_rand.c
...
int app_RAND_load_file(const char *file, BIO *bio_e, int dont_warn)
{
int consider_randfile = (file == NULL);
char buffer[200];
#ifdef OPENSSL_SYS_WINDOWS
BIO_printf(bio_e,"Loading 'screen' into random state -");
BIO_flush(bio_e);
RAND_screen();
BIO_printf(bio_e," done\n");
#endif
...
Did I misunderstood something ? This is still in use in 0.9.8m, right
? Should I use another function instead ?
Thanks again for your help,
--
Mathieu
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