rand interface while upgrading openssl

[Chitrang Srivastava]

Hi,

I am trying to upgrade openssl for my embedded OS platform. The one we
currently use is pretty old i.e. *OpenSSL  0.9.6a * , but porting to
Openssl 1.1.1b works fine.

I need suggestion regarding random number interface , earlier we were
using  RAND_METHOD.
Can I still use the same mechanism? Because I see new code *rand* folder
contains OS  specific implementation of

rand_pool_acquire_entropy
rand_pool_add_nonce_data
rand_pool_add_additional_data

As I understand , above function also needs to be ported?
Any document to start with porting random number to any platform.

Thanks
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