tari-project / tari-crypto / 9935911201

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feat: use constant-time equality checking for DHKE (#232)

This PR ensures that `DiffieHellmanSharedSecret` equality testing is
done in constant time.

Previously, this equality testing was offloaded to the underlying
`PublicKey` type. While this type supports the `ConstantTimeEq` trait,
it is not guaranteed that equality testing will use this in all
implementations.

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