crypto: use RustCrypto utils over deprecated rust-crypto #12
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This change started due to my unfortunate exposure to a bug impacting
the ability for my project to target aarch64:
DaGenix/rust-crypto#383.
In that issue (and in others) it is clear that rust-crypto is now
deprecated in favor of the RustCrypto crates (here we need sha2/hmac).
This change drops in this replacement for rust-crypto.
CC @nastevens