Reduce Chacha rounds from 20 --> 8

[chocolatkey]

Reducing the rounds of Chacha used in the encryption/decryption scheme leads to a performance increase, at no real cost to security. Please see this paper if you are interested in more details on why Chacha8 is still secure: https://eprint.iacr.org/2019/1492.pdf
I think the sacrifice in security is worth it for the increased performance in a chip like this.