thirdparty libs wishlist for ipfs support

For supporting ipfs content validation in sgx, the following libs would be helpful:

https://github.com/multiformats/rust-multihash
https://github.com/multiformats/rust-multibase
https://github.com/multiformats/rust-cid

Any chance you could port these? They're using other crypto libs than are already ported, so I fear it's not straightforward
I'd be happy to contribute an example for their usage

Review the SGX SDK context and the three requested Rust libraries: rust-multihash, rust-multibase, and rust-cid. Check their existing crypto-library dependencies and assess whether each can be ported for IPFS content validation in SGX. Done means the required libraries are usable in the SDK and an example demonstrates their usage.

Written by the indexing model from the issue text.