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Document that we include the message lengths in the transcript.

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Isis Lovecruft 2020-09-21 22:05:59 +00:00
parent 57a5473cb0
commit a02190adf3
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1 changed files with 6 additions and 1 deletions
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7
src/batch.rs
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@ -58,12 +58,17 @@ impl BatchTranscript for Transcript {
/// Each is also prefixed with their index in the vector.
fn append_scalars(&mut self, scalars: &Vec<Scalar>) {
for (i, scalar) in scalars.iter().enumerate() {
// XXX add message length into transcript
self.append_u64(b"", i as u64);
self.append_message(b"hram", scalar.as_bytes());
}
}
/// Append the lengths of the messages into the transcript.
///
/// This is done out of an (potential over-)abundance of caution, to guard
/// against the unlikely event of collisions. However, a nicer way to do
/// this would be to append the message length before the message, but this
/// is messy w.r.t. the calculations of the `H(R||A||M)`s above.
fn append_message_lengths(&mut self, message_lengths: &Vec<usize>) {
for (i, len) in message_lengths.iter().enumerate() {
self.append_u64(b"", i as u64);