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// Copyright (C) 2019-2023 Aleo Systems Inc.
// This file is part of the snarkVM library.

// The snarkVM library is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// The snarkVM library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with the snarkVM library. If not, see <https://www.gnu.org/licenses/>.

use super::*;

impl<A: Aleo> Request<A> {
    /// Returns the transition public key `tpk`.
    pub fn to_tpk(&self) -> Group<A> {
        // Retrieve the challenge from the signature.
        let challenge = self.signature.challenge();
        // Retrieve the response from the signature.
        let response = self.signature.response();
        // Retrieve `pk_sig` from the signature.
        let pk_sig = self.signature.compute_key().pk_sig();
        // Compute `tpk` as `(challenge * pk_sig) + (response * G)`, equivalent to `r * G`.
        (pk_sig * challenge) + A::g_scalar_multiply(response)
    }
}