Am Montag, 20. März 2017, 14:28:58 CET schrieb Herbert Xu: Hi Herbert, > On Mon, Mar 20, 2017 at 12:19:32PM +0530, PrasannaKumar Muralidharan wrote: > > AF_ALG interface for rng does have seeding support. I think hw_random > > does not provide seeding support intentionally as I understand that > > True RNG need not require seeding (please correct me if I am wrong). > > Yes. We should be converting PRNGs in hwrng over to algif_rng. IMHO this not only applies to the PRNGs in drivers/crypto (which should simply register with crypto_register_rngs) but also to ~/hacking/sources/linux/arch/ s390/crypto/prng.c which exports a /dev/prandom file. For the seeding, it may make sense to follow the example given with crypto/ drbg.c using the add_random_ready_callback function. Ciao Stephan
