[TF-M] Using software random generator for FIH library

Hi all,

Does anyone know if using software random generator seeded with TRNG to provide random delays for Fault Injection Hardening library is correct from PSA Level 3 certification point of view?

The basic idea is to :

1. Use TRNG to provide seed for software random generator on fih_delay_init. 2. Use software random generator to implement fih_delay_random. 3. Periodically reseed software random generator with data from TRNG (optional).

Thanks, Roman.