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This warning kind of snuck up on us! (See #748) For now, let's
disable it. (I've cleaned it up in a couple of examples, since
those are meant to be more idiomatic and user-facing.)
Closes #748.
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There are some places in the protocol where we have an all-zero RSA
identity that does not truly represent a key, but rather represents
an absent or unknown key. For these, it's better to use
`RsaIdentity::is_zero` instead of manually checking for a set of
zero bytes: it expresses the intent better, and ensures that the
operation is constant-time.
I am deliberately not introducing a more general IsZero trait here,
or implementing is_zero for anything else: This is the only one we
seem to need right now. We can generalize it later if we have to.
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This only affects uses of thread_rng(), and affects them all more or
less indiscriminately. One test does not work with
ARTI_TEST_PRNG=deterministic; the next commit will fix it.
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Remove all `use` statements for `TryFrom` and `TryInto`. These are
now redundant in Rust 2021.
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We perform this operation in a bunch of places, and most of them
use hex::decode(). That's not great, since hex::decode() has to do
heap allocation. This implementation uses hex::decode_to_slice(),
which should be faster.
(In the future we might choose to use one of the faster hex
implementations, but I'm hoping that this change will be sufficient
to get hex decoding out of our profiles.)
Part of #377.
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I'm going to change the code that does this, so add a test first
to check the output doesn't change.
At some point we should have more RSA tests.
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This will cause some pain for now, but now is really the best time
to do this kind of thing.
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