Method challenge_bytes_with_non_static_label

merlin/src/transcript.rs:188–213

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

    }

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

        #[cfg(feature = "debug-transcript")]
        {
            use std::str::from_utf8;

            match from_utf8(label) {
                Ok(label_str) => {
                    println!(
                        "meta-AD : {} || LE32({})\t# b\"{}\"",
                        hex::encode(label),
                        dest.len(),
                        label_str
                    );
                }
                Err(_) => {
                    println!("meta-AD : {} || LE32({})", hex::encode(label), dest.len());
                }
            }
            println!("     PRF: {}", hex::encode(dest));
        }
    }

    /// Fork the current [`Transcript`] to construct an RNG whose output is bound
    /// to the current transcript state as well as prover's secrets.