CAN will depend on openssl for hashing algorithms

node uses openssl for crypto under the hood. Because CAN will encode digests with multihash, can will be able to provide fallbacks in the future.

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• CAN will use multihash to encode digests
  • The CAN notebook will address notes using multihash encoded digests. This will allow future support for fallbacks in the case of a problem - as CAN will depend on openssl for hashing algorithms
• Which hashing algorithm should the CAN manager use?
  • This leads to a few decisions. Firstly, CAN will use SHA3-512 digests. Secondly, CAN will use multihash to encode digests. Finally as node relies on openssl for crypto, CAN will depend on openssl for hashing algorithms.