tor_proto::circuit

Struct CircuitBinding

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pub struct CircuitBinding(Box<Zeroizing<[u8; 20]>>);
Expand description

Cryptographic information used to bind a message to a specific circuit.

This information is used in some of our protocols (currently only the onion services protocol) to prove that a given message was referring to a specific hop on a specific circuit, and was not replayed from another circuit.

In tor-spec and rend-spec, this value is called KH.

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§0: Box<Zeroizing<[u8; 20]>>

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impl CircuitBinding

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pub fn hs_mac(&self) -> HsMacKey<'_>

Available on crate feature hs-service only.

Return a view of this key suitable for computing the MAC function used to authenticate onion services’ ESTABLISH_INTRODUCE messages.

Note that this is not a general-purpose MAC; please avoid adding new users of it. See notes on hs_mac for more information.

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fn dangerously_into_bytes(&self) -> &[u8] ⓘ

Available on crate feature hs-service only.

Return a view of this key as a byte-slice.

This is potentially dangerous, since we don’t want to expose this information: We only want to use it as a MAC key.

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impl Clone for CircuitBinding

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fn clone(&self) -> CircuitBinding

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl From<[u8; 20]> for CircuitBinding

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fn from(value: [u8; 20]) -> Self

Converts to this type from the input type.
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impl TryFrom<&[u8]> for CircuitBinding

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(value: &[u8]) -> Result<Self, Self::Error>

Performs the conversion.

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