1use super::scalar::Scalar;
 2use super::transcript::ProofTranscript;
 3use ark_std::UniformRand;
 4use merlin::Transcript;
 5
 6pub struct RandomTape {
 7    tape: Transcript,
 8}
 9
10impl RandomTape {
11    pub fn new(name: &'static [u8]) -> Self {
12        let tape = {
13            let mut rng = ark_std::rand::thread_rng();
14            let mut tape = Transcript::new(name);
15            tape.append_scalar(b"init_randomness", &Scalar::rand(&mut rng));
16            tape
17        };
18        Self { tape }
19    }
20
21    pub fn random_scalar(&mut self, label: &'static [u8]) -> Scalar {
22        self.tape.challenge_scalar(label)
23    }
24
25    pub fn random_vector(&mut self, label: &'static [u8], len: usize) -> Vec<Scalar> {
26        self.tape.challenge_vector(label, len)
27    }
28}