Bitcoin Core currently only support to using RDRAND / RDSEED instruction on x86 architecture when requiring to generate a ultra high quality random numbers. For example, a private key. https://github.com/bitcoin/bitcoin/blob/master/src/random.h https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp
ARM later added two new similar instructions as well, RNDR (similar to RDRAND) / RNDRRS (similar to RDSEED). https://developer.arm.com/documentation/ddi0601/2022-12/AArch64-Registers/RNDR--Random-Number https://developer.arm.com/documentation/ddi0601/2022-12/AArch64-Registers/RNDRRS--Reseeded-Random-Number
OpenSSL also had a similar feature request on last year. (Implemented) https://github.com/openssl/openssl/issues/15627 https://github.com/openssl/openssl/pull/15361 https://github.com/openssl/openssl/blob/master/providers/implementations/rands/seeding/rand_cpu_arm64.c
I hope this feature is also available on Bitcoin Core as Bitcoin Core also can using on ARM machine (E.g. A Mac computer using Apple silicon, Raspberry Pi…).
