True random numbers in Sol10 Post: 302978154

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Operating Systems Solaris True random numbers in Sol10 Post 302978154 by jlliagre on Tuesday 26th of July 2016 06:10:38 PM

07-26-2016

Registered User

You are right, the manual pages are indeed similar. The point here is the recommendation to avoid /dev/random and /dev/urandom might be valid when using a cryptographic pseudo random number generator but not that much in the OP case, which is specifically about the UltraSPARC T2 and newer high-performance internal hardware random number generator. The latter bases its entropy on physical measurements, i.e. not purely software generated sequences so shouldn't suffer from rapid entropy exhaustion like its software counterpart.
See this last paragraph in Solaris random(7d) manual:

Quote:

/dev/random collects entropy from providers that are registered with the kernel-level cryptographic framework and implement random number generation routines. The cryptoadm(1M) utility allows an administrator to configure which providers will be used with /dev/random.

Other relevant manual pages are cryptoadm(1m) and n2rng(7d)

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rand_r

rand(3C)																  rand(3C)

NAME

       rand(), rand_r(), srand() - simple random-number generator

SYNOPSIS

DESCRIPTION

       uses  a	multiplicative,  congruential, random-number generator with period 2^32 that returns successive pseudo-random numbers in the range
       from 0 to 2^15-1.

       can be called at any time to reset the random-number generator to a random starting point.  The generator is initially seeded with a  value
       of 1.

       returns a random number at the address pointed to by the randval parameter.  The seed parameter can be set at any time to start the random-
       number generator at an arbitrary point.

   Note
       The spectral properties of leave a great deal to be desired.  provides a much better, though more elaborate, random-number  generator  (see
       drand48(3C)).

RETURN VALUE

       If seed or randval is NULL, returns 0.  Otherwise, returns a psuedo-random integer.

EXAMPLES

       The following:

	      int x, y;
	      srand(10);
	      x = rand();
	      y = rand();

       would produce the same results as:

	      int x, y, s = 10;
	      x=rand_r(&s);
	      y=rand_r(&s);

WARNINGS

       Users  of  should  note	that  rand_r()	now conforms with POSIX.1c.  The old prototype of is supported for compatibility with existing DCE
       applications only.

SEE ALSO

       drand48(3C), random(3M), thread_safety(5), random(7).

STANDARDS CONFORMANCE

																	  rand(3C)