Method challenge_bytes

merlin/src/transcript.rs:184–186

Fill the supplied buffer with the verifier's challenge bytes. The `label` parameter is metadata about the challenge, and is also appended to the transcript. See the [Transcript Protocols](https://merlin.cool/use/protocol.html) section of the Merlin website for details on labels.

(&mut self, label: &'static [u8], dest: &mut [u8])

    /// Protocols](https://merlin.cool/use/protocol.html) section of
    /// the Merlin website for details on labels.
    pub fn challenge_bytes(&mut self, label: &'static [u8], dest: &mut [u8]) {
        self.challenge_bytes_with_non_static_label(label, dest)
    }

    pub fn challenge_bytes_with_non_static_label(&mut self, label: &[u8], dest: &mut [u8]) {
        let data_len = encode_usize_as_u32(dest.len());