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CryptState

tor_proto::crypto::cell::tor1

Struct CryptState 

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struct CryptState<SC: StreamCipher, D: Digest + Clone> {
    cipher: SC,
    digest: D,
    last_sendme_tag: SendmeTag,
}
Expand description

A CryptState represents one layer of shared cryptographic state between a relay and a client for a single hop, in a single direction.

For example, if a client makes a 3-hop circuit, then it will have 6 CryptStates, one for each relay, for each direction of communication.

Note that although CryptState is used to implement OutboundClientLayer, InboundClientLayer, OutboundRelayLayer, and InboundRelayLayer, each instance will only be used for one of these roles.

It is parameterized on a stream cipher and a digest type: most circuits will use AES-128-CTR and SHA1, but v3 onion services use AES-256-CTR and SHA-3.

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§cipher: SC

Stream cipher for en/decrypting cell bodies.

This cipher is the one keyed with Kf or Kb in the spec.

§digest: D

Digest for authenticating cells to/from this hop.

This digest is the one keyed with Df or Db in the spec.

§last_sendme_tag: SendmeTag

Most recent digest value generated by this crypto.

Trait Implementations§

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impl<SC: StreamCipher, D: Digest + Clone> From<CryptState<SC, D>> for ClientInbound<SC, D>

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fn from(value: CryptState<SC, D>) -> Self

Converts to this type from the input type.
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impl<SC: StreamCipher, D: Digest + Clone> From<CryptState<SC, D>> for ClientOutbound<SC, D>

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fn from(value: CryptState<SC, D>) -> Self

Converts to this type from the input type.
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impl<SC: StreamCipher, D: Digest + Clone> From<CryptState<SC, D>> for RelayInbound<SC, D>

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fn from(value: CryptState<SC, D>) -> Self

Converts to this type from the input type.
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impl<SC: StreamCipher, D: Digest + Clone> From<CryptState<SC, D>> for RelayOutbound<SC, D>

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fn from(value: CryptState<SC, D>) -> Self

Converts to this type from the input type.

Auto Trait Implementations§

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impl<SC, D> Freeze for CryptState<SC, D>
where SC: Freeze, D: Freeze,

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impl<SC, D> RefUnwindSafe for CryptState<SC, D>
where SC: RefUnwindSafe, D: RefUnwindSafe,

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impl<SC, D> Send for CryptState<SC, D>
where SC: Send, D: Send,

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impl<SC, D> Sync for CryptState<SC, D>
where SC: Sync, D: Sync,

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impl<SC, D> Unpin for CryptState<SC, D>
where SC: Unpin, D: Unpin,

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impl<SC, D> UnsafeUnpin for CryptState<SC, D>
where SC: UnsafeUnpin, D: UnsafeUnpin,

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impl<SC, D> UnwindSafe for CryptState<SC, D>
where SC: UnwindSafe, D: UnwindSafe,

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