Re: [kvm-unit-tests PATCH v3 1/7] lib: Add pseudo random functions

Andrew Jones
2024-08-12T14:17:52Z

On Thu, Jun 20, 2024 at 04:16:54PM GMT, Nina Schoetterl-Glausch wrote:
> Add functions for generating pseudo random 32 and 64 bit values.
> The implementation uses SHA-256 and so the randomness should have good
> quality.
> Implement the necessary subset of SHA-256.
> The PRNG algorithm is equivalent to the following python snippet:
>
> def prng32(seed):
> from hashlib import sha256
> state = seed.to_bytes(8, byteorder="big")
> while True:
> state = sha256(state).digest()
> for i in range(8):
> yield int.from_bytes(state[i*4:(i+1)*4], byteorder="big")
>
> Acked-by: Andrew Jones <andrew.jones@linux.dev>
> Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
> ---
>

There was a discussion about potentially needing random numbers for
RISC-V SBI tests, so I've queued this on riscv/sbi,
https://gitlab.com/jones-drew/kvm-unit-tests/-/commits/riscv%2Fsbi

Thanks,
drew