Enum snow::Session
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pub enum Session { Handshake(HandshakeState), Transport(TransportState), }
A state machine for the entire Noise session.
Enums provide a convenient interface as it's how Rust implements union structs, meaning this is a sized object.
Variants
Handshake(HandshakeState)
Transport(TransportState)
Methods
impl Session
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pub fn is_payload_encrypted(&self) -> bool
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If the payload will be encrypted or not. In a future version of Snow, this interface may change to more proactively prevent unauthenticated, plaintext payloads during handshakes.
See Payload Security Properties for more information.
pub fn is_handshake_finished(&self) -> bool
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True if the handshake is finished and the Session state machine is ready to be transitioned to transport mode. This function also returns a vacuous true if already in transport mode.
Examples
let mut session = NoiseBuilder::new("Noise_NN_25519_AESGCM_SHA256".parse()?) .build_initiator()?; if (session.is_handshake_finished()) { session = session.into_transport_mode()?; }
pub fn write_message(
&mut self,
payload: &[u8],
output: &mut [u8]
) -> Result<usize>
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&mut self,
payload: &[u8],
output: &mut [u8]
) -> Result<usize>
Construct a message from payload
(and pending handshake tokens if in handshake state),
and writes it to the output
buffer.
Returns the size of the written payload.
Errors
Will result in NoiseError::InputError
if the size of the output exceeds the max message
length in the Noise Protocol (65535 bytes).
pub fn read_message(
&mut self,
input: &[u8],
payload: &mut [u8]
) -> Result<usize>
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&mut self,
input: &[u8],
payload: &mut [u8]
) -> Result<usize>
Reads a noise message from input
Returns the size of the payload written to payload
.
Errors
Will result in NoiseError::DecryptError
if the contents couldn't be decrypted and/or the
authentication tag didn't verify.
Panics
This function will panic if there is no key, or if there is a nonce overflow.
pub fn rekey(
&mut self,
initiator: Option<&[u8]>,
responder: Option<&[u8]>
) -> Result<()>
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&mut self,
initiator: Option<&[u8]>,
responder: Option<&[u8]>
) -> Result<()>
Set a new key for the one or both of the initiator-egress and responder-egress symmetric ciphers.
Errors
Will result in NoiseError::StateError
if not in transport mode.
pub fn receiving_nonce(&self) -> Result<u64>
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Get the forthcoming inbound nonce value.
Errors
Will result in NoiseError::StateError
if not in transport mode.
pub fn sending_nonce(&self) -> Result<u64>
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Get the forthcoming outbound nonce value.
Errors
Will result in NoiseError::StateError
if not in transport mode.
pub fn set_receiving_nonce(&mut self, nonce: u64) -> Result<()>
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Set the forthcoming incoming nonce value.
Errors
Will result in NoiseError::StateError
if not in transport mode.
pub fn into_transport_mode(self) -> Result<Self>
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Transition the session into transport mode. This can only be done once the handshake has finished.
Consumes the previous state, and returns the new transport state object, thereby freeing any material only used during the handshake phase.
Errors
Will result in NoiseError::StateError
if the handshake is not finished.
Examples
let mut session = NoiseBuilder::new("Noise_NN_25519_AESGCM_SHA256".parse()?) .build_initiator()?; // ... complete handshake ... session = session.into_transport_mode()?;