static int
arc4_seed(void)
{
int ok = 0;
/* We try every method that might work, and don't give up even if one
* does seem to work. There's no real harm in over-seeding, and if
* one of these sources turns out to be broken, that would be bad. */
#ifdef TRY_SEED_WIN32
if (0 == arc4_seed_win32())
ok = 1;
#endif
#ifdef TRY_SEED_URANDOM
if (0 == arc4_seed_urandom())
ok = 1;
#endif
#ifdef TRY_SEED_PROC_SYS_KERNEL_RANDOM_UUID
if (0 == arc4_seed_proc_sys_kernel_random_uuid())
ok = 1;
#endif
#ifdef TRY_SEED_SYSCTL_LINUX
/* Apparently Linux is deprecating sysctl, and spewing warning
* messages when you try to use it. */
if (!ok && 0 == arc4_seed_sysctl_linux())
ok = 1;
#endif
#ifdef TRY_SEED_SYSCTL_BSD
if (0 == arc4_seed_sysctl_bsd())
ok = 1;
#endif
return ok ? 0 : -1;
}
static void arc4_seed( void )
{
int ok = 0;
/*
* We try every method that might work, and don't give up even if one
* does seem to work. There's no real harm in over-seeding, and if
* one of these sources turns out to be broken, that would be bad.
*/
#if defined( TRY_SEED_MS_CRYPTOAPI )
if( arc4_seed_win() == 0 )
ok = 1;
#endif
#if defined( TRY_SEED_URANDOM )
if( arc4_seed_urandom() == 0 )
ok = 1;
#endif
#if defined( TRY_SEED_PROC_SYS_KERNEL_RANDOM_UUID )
if( arc4_seed_proc_sys_kernel_random_uuid() == 0 )
ok = 1;
#endif
#if defined( TRY_SEED_SYSCTL_LINUX )
/*
* Apparently Linux is deprecating sysctl, and spewing warning
* messages when you try to use it. To avoid dmesg spamming,
* only try this if no previous method worked.
*/
if( ! ok && arc4_seed_sysctl_linux() == 0 )
ok = 1;
#endif
#if defined( TRY_SEED_SYSCTL_BSD )
if( arc4_seed_sysctl_bsd() == 0 )
ok = 1;
#endif
/*
* If nothing else worked or there is no specific seeding
* method for the current platform, fall back to rand().
* In case an existing platform-specific method had a
* (transient) failure, it will be re-tried at the next
* seeding cycle.
*/
if( ! ok )
arc4_seed_rand();
}
