snarkvm_ledger_puzzle/solution_id/
mod.rs

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// Copyright 2024 Aleo Network Foundation
// This file is part of the snarkVM library.

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:

// http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

mod bytes;
mod serialize;
mod string;

pub use string::SOLUTION_ID_PREFIX;

use console::{account::Address, network::prelude::*};
use snarkvm_algorithms::crypto_hash::sha256d_to_u64;

use core::marker::PhantomData;

/// The solution ID.
#[derive(Copy, Clone, Eq, PartialEq, Hash)]
pub struct SolutionID<N: Network>(u64, PhantomData<N>);

impl<N: Network> From<u64> for SolutionID<N> {
    /// Initializes a new instance of the solution ID.
    fn from(nonce: u64) -> Self {
        Self(nonce, PhantomData)
    }
}

impl<N: Network> SolutionID<N> {
    /// Initializes the solution ID from the given epoch hash, address, and counter.
    pub fn new(epoch_hash: N::BlockHash, address: Address<N>, counter: u64) -> Result<Self> {
        // Construct the nonce as sha256d(epoch_hash_bytes_le[0..8] || address || counter).
        let mut bytes_le = Vec::new();
        let lower_bytes = &epoch_hash.to_bytes_le()?[0..8];
        bytes_le.extend_from_slice(lower_bytes);
        bytes_le.extend_from_slice(&address.to_bytes_le()?);
        bytes_le.extend_from_slice(&counter.to_bytes_le()?);
        Ok(Self::from(sha256d_to_u64(&bytes_le)))
    }
}

impl<N: Network> Deref for SolutionID<N> {
    type Target = u64;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}