rand interface while upgrading openssl

[Chitrang Srivastava <chitrang.srivastava@xxxxxxxxx>]

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