The UltraSPARC T2 has a hardware random number generator (RNG) capability. The HW is controlled by the n2rng device driver. The n2rng random number generation algorithm was implemented in accordance with the recommendations in FIPS 186-2 appendix 3. From a user's perspective, this functionality is exposed via PKC#11 C_GenerateRandom() and is also leveraged in /dev/random. /dev/urandom uses the HW RNG only for the initial seed and periodic reseeding.
Kstat can be used to check if the HW RNG was used:
kstat -m n2rng
Additional information on the RNG hardware can be found here (sections 13.1.1) and here.
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