Struct PaddingCell 

pub struct PaddingCell {
    pub payload: Vec<u8>,
}

Fixed-size padding cell for traffic analysis resistance.

Padding cells are used to maintain constant traffic patterns and prevent traffic analysis attacks. The payload is random data that is ignored by the receiver.

Wire Format

[ CircID ][ 0 (PADDING) ][ 509 bytes random payload ]

Example

use stem_rs::client::cell::PaddingCell;
use stem_rs::client::datatype::LinkProtocol;

// Create with random payload
let cell = PaddingCell::new();

// Create with specific payload
let payload = vec![0u8; 509];
let cell = PaddingCell::with_payload(payload).unwrap();

Fields

payload: Vec<u8>

The padding payload (exactly 509 bytes).

Implementations

impl PaddingCell

pub fn new() -> Self

Creates a new padding cell with random payload.

The payload is filled with cryptographically random bytes.

pub fn with_payload(payload: Vec<u8>) -> Result<Self, Error>

Creates a padding cell with a specific payload.

Arguments

• payload - Must be exactly 509 bytes

Errors

Returns Error::Protocol if payload is not exactly 509 bytes.

pub fn pack(&self, link_protocol: &LinkProtocol) -> Vec<u8>

Packs this cell into bytes for transmission.

pub fn unpack(payload: &[u8]) -> Result<Self, Error>

Unpacks a PADDING cell from payload bytes.

Trait Implementations

impl Clone for PaddingCell

fn clone(&self) -> PaddingCell

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PaddingCell

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for PaddingCell

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for PaddingCell

fn eq(&self, other: &PaddingCell) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for PaddingCell