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//! Transcript data types.
use std::ops::Range;
use bytes::Bytes;
use serde::{Deserialize, Serialize};
use utils::range::{RangeDifference, RangeSet, RangeUnion};
pub(crate) static TX_TRANSCRIPT_ID: &str = "tx";
pub(crate) static RX_TRANSCRIPT_ID: &str = "rx";
/// A transcript contains a subset of bytes from a TLS session
#[derive(Default, Serialize, Deserialize, Clone, Debug)]
pub struct Transcript {
data: Bytes,
}
impl Transcript {
/// Creates a new transcript with the given ID and data
pub fn new(data: impl Into<Bytes>) -> Self {
Self { data: data.into() }
}
/// Returns the actual traffic data of this transcript
pub fn data(&self) -> &Bytes {
&self.data
}
/// Returns a concatenated bytestring located in the given ranges of the transcript.
///
/// # Panics
///
/// Panics if the range set is empty or is out of bounds.
pub(crate) fn get_bytes_in_ranges(&self, ranges: &RangeSet<usize>) -> Vec<u8> {
let max = ranges.max().expect("range set is not empty");
assert!(max <= self.data.len(), "range set is out of bounds");
ranges
.iter_ranges()
.flat_map(|range| &self.data[range])
.copied()
.collect()
}
}
/// A transcript which may have some data redacted.
#[derive(Debug)]
pub struct RedactedTranscript {
data: Vec<u8>,
/// Ranges of `data` which have been authenticated
auth: RangeSet<usize>,
/// Ranges of `data` which have been redacted
redacted: RangeSet<usize>,
}
impl RedactedTranscript {
/// Creates a new redacted transcript with the given length.
///
/// All bytes in the transcript are initialized to 0.
///
/// # Arguments
///
/// * `len` - The length of the transcript
/// * `slices` - A list of slices of data which have been authenticated
pub fn new(len: usize, slices: Vec<TranscriptSlice>) -> Self {
let mut data = vec![0u8; len];
let mut auth = RangeSet::default();
for slice in slices {
data[slice.range()].copy_from_slice(slice.data());
auth = auth.union(&slice.range());
}
let redacted = RangeSet::from(0..len).difference(&auth);
Self {
data,
auth,
redacted,
}
}
/// Returns a reference to the data.
///
/// # Warning
///
/// Not all of the data in the transcript may have been authenticated. See
/// [authed](RedactedTranscript::authed) for a set of ranges which have been.
pub fn data(&self) -> &[u8] {
&self.data
}
/// Returns all the ranges of data which have been authenticated.
pub fn authed(&self) -> &RangeSet<usize> {
&self.auth
}
/// Returns all the ranges of data which have been redacted.
pub fn redacted(&self) -> &RangeSet<usize> {
&self.redacted
}
/// Sets all bytes in the transcript which were redacted.
///
/// # Arguments
///
/// * `value` - The value to set the redacted bytes to
pub fn set_redacted(&mut self, value: u8) {
for range in self.redacted().clone().iter_ranges() {
self.data[range].fill(value);
}
}
/// Sets all bytes in the transcript which were redacted in the given range.
///
/// # Arguments
///
/// * `value` - The value to set the redacted bytes to
/// * `range` - The range of redacted bytes to set
pub fn set_redacted_range(&mut self, value: u8, range: Range<usize>) {
for range in self
.redacted
.difference(&(0..self.data.len()).difference(&range))
.iter_ranges()
{
self.data[range].fill(value);
}
}
}
/// Slice of a transcript.
#[derive(PartialEq, Debug, Clone, Default)]
pub struct TranscriptSlice {
/// A byte range of this slice
range: Range<usize>,
/// The actual byte content of the slice
data: Vec<u8>,
}
impl TranscriptSlice {
/// Creates a new transcript slice.
pub fn new(range: Range<usize>, data: Vec<u8>) -> Self {
Self { range, data }
}
/// Returns the range of bytes this slice refers to in the transcript
pub fn range(&self) -> Range<usize> {
self.range.clone()
}
/// Returns the bytes of this slice
pub fn data(&self) -> &[u8] {
&self.data
}
/// Returns the bytes of this slice
pub fn into_bytes(self) -> Vec<u8> {
self.data
}
}
/// The direction of data communicated over a TLS connection.
///
/// This is used to differentiate between data sent from the Prover to the TLS peer,
/// and data received by the Prover from the TLS peer (client or server).
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum Direction {
/// Sent from the Prover to the TLS peer.
Sent,
/// Received by the prover from the TLS peer.
Received,
}
/// Returns the value ID for each byte in the provided range set
pub fn get_value_ids(
ranges: &RangeSet<usize>,
direction: Direction,
) -> impl Iterator<Item = String> + '_ {
let id = match direction {
Direction::Sent => TX_TRANSCRIPT_ID,
Direction::Received => RX_TRANSCRIPT_ID,
};
ranges.iter().map(move |idx| format!("{}/{}", id, idx))
}
#[cfg(test)]
mod tests {
use rstest::{fixture, rstest};
use super::*;
#[fixture]
fn transcripts() -> (Transcript, Transcript) {
let sent = "data sent 123456789".as_bytes().to_vec();
let recv = "data received 987654321".as_bytes().to_vec();
(Transcript::new(sent), Transcript::new(recv))
}
#[rstest]
fn test_get_bytes_in_ranges(transcripts: (Transcript, Transcript)) {
let (sent, recv) = transcripts;
let range1 = Range { start: 2, end: 4 };
let range2 = Range { start: 10, end: 15 };
// a full range spanning the entirety of the data
let range3 = Range {
start: 0,
end: sent.data().len(),
};
let expected = "ta12345".as_bytes().to_vec();
assert_eq!(
expected,
sent.get_bytes_in_ranges(&RangeSet::from([range1.clone(), range2.clone()]))
);
let expected = "taved 9".as_bytes().to_vec();
assert_eq!(
expected,
recv.get_bytes_in_ranges(&RangeSet::from([range1, range2]))
);
assert_eq!(
sent.data().as_ref(),
sent.get_bytes_in_ranges(&RangeSet::from([range3]))
);
}
#[rstest]
#[should_panic]
fn test_get_bytes_in_ranges_empty(transcripts: (Transcript, Transcript)) {
let (sent, _) = transcripts;
sent.get_bytes_in_ranges(&RangeSet::default());
}
#[rstest]
#[should_panic]
fn test_get_bytes_in_ranges_out_of_bounds(transcripts: (Transcript, Transcript)) {
let (sent, _) = transcripts;
let range = Range {
start: 0,
end: sent.data().len() + 1,
};
sent.get_bytes_in_ranges(&RangeSet::from([range]));
}
}