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First, run
```
git grep -l "^edition =" |
xargs perl -i -pe 's/^edition *=.*/edition = "2024"/;'
```
Second, manually verify that all Cargo.toml files have changed,
and nothing else has changed.
Third, run cargo fmt again.
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Previously it required the caller to import a whole bunch of stuff.
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We're going to use it for ntorv3 extensions as well.
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With this change, we'll no longer need to expose the types from
dalek-cryptography as part of our API, and we'll have more freedom
to switch ed25519 implementations, or to upgrade to a newer
`rand` ahead of their schedule.
Unlike with x25519-dalek, I had to tweak the API a bit: There's no
way to get a &PublicKey out of a Keypair now, and implementing the
old ed25519-dalek traits seemed unnecessary.
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We only need Eq and PartialEq but given those we should have Hash too.
(We're going to want to be able to compare parameters for equality.)
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The main changes that we have to adjust for are as follows:
* In x25519-dalek:
* `StaticSecret` is now behind a feature.
* `StaticSecret::new` is deprecated in favor of
`StaticSecret::random_from_rng`.
* StaticSecret no longer does its own clamping.
* In ed25519-dalek:
* `SecretKey` has (in effect) been renamed to `SigningKey`. The name
`SecretKey` is now an alias for `[u8; 32]`.
* `SigningKey` is effectively a keypair, since it contains a
public key as well.
* `PublicKey` has been renamed to `VerifyingKey`.
* The functions to extract a signing key and verifying key have
been renamed as you might expect.
* `ExpandedSecretKey` has been moved to `hasmat` and no longer
implements `sign`.
* `ExpanededSecretKey` now has as its elements a scalar and a hash
prefix.
* Various functions that took `&[u8]` now take `&[u8; N]`.
* We no longer need a wrapper for older versions of rand.
There is a single test in tor-keymgr that does not pass. I've
marked it as ignore for now, in hopes that @gabi-250 can help me
figure it out.
This closes #808. There are several changes I want to make before
we merge, however. They are marked with TODO DALEK.
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It does not help that C tor has a set of parameters and a set of
configuration options with exactly the same names which configure
the same thing in two slightly different ways.
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This allows us to allow passing in opaque HsMacKey objects,
rather than untyped byte slices.
Additionally, we now check both MAC and signature unconditionally,
to avoid the large timing side-channel. The small timing
side-channel of combining booleans with `&` is considered safe.
Part of #993.
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Yes, we still will need more accessors for onion services, but we
can add them as we find the need.
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The old code parsed and encoded a signature and a mac... but there
was no way to actually set them properly. Now EstablishIntro is
built around an EstablishIntroBody, and has the ability to check
signatures and macs.
Because there is no way to handle one of these messages if we can't
check the signature, we no longer accept unrecognized `auth_key` types
in this message.
I've added a test to make sure that we can validate a message from the
C tor implementation, and a test to make sure we can validate our
own cells. I also had to modify the previous tests so that their
keys were well-formed.
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Several HS message types have an extension list type. They all use
the same framing for extensions, but each of them has separate
extension types and separate extension namespaces.
This commit simplifies establish_intro a little, and adds support
for maintaining unrecognized extension types--at the expense of some
new internal code.
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Some of the HS message types have a lot of dependent types, like
extensions and options for those extensions, and so on. Except when
those extensions are portable across cell types, it makes sense
to put them in their own modules.
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