The main problem of MBEDTLS_PSA_CRYPTO_LEGACY_RNG is that it
brings in some legacy modules (entropy + ctr_drbg/hmac_drbg)
which means extra ROM/RAM footprint.
MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG instead simply calls to the
CSPRNG which makes it definitely smaller.
Signed-off-by: Valerio Setti <vsetti@baylibre.com>
Add a sample to demonstrate use of persistent keys in the PSA Crypto API.
The implementation of the PSA ITS API that allows storage of persistent
keys is provided either by the just-introduced secure storage subsystem
or by TF-M.
Signed-off-by: Tomi Fontanilles <tomi.fontanilles@nordicsemi.no>