Feature/slam zeroize txs #2931
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Feature/slam zeroize txs #2931
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This is an experimental change to improve hygeine of memory in the consensus enclave (but also in the clients) This makes a bunch of objects derive `Zeroize` in transaction-core, and makes the `Tx` object zeroize itself on drop. For examples of why this is a good change, consider that, in the `mc-connection` ThickClient crate, after we serialize a Tx to protobuf and encrypt it for the enclave, we zeroize the plaintext. However, before this change, we do not zeroize the `Tx` object (since it would not have been possible), so another copy of the data that we zeroized continues to exist in memory. After this change, the `Tx` will zeroize itself automatically as well. The main reason not to do this would be if it hurts the performance of the consensus nodes, but I consider this unlikely, because, the untrusted side never actually sees `Tx` objects so SCP should not be meaningfully impacted by this, only the transaction validation handles the decrypted `Tx`. And the elliptic curve operations done to validate a Tx should be many orders of magnitude more expensive than a zeroizing operation. So I expect no measurable performance difference as a result of this change. See github issue #2717
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An attempt to slam #2925