tari_core 0.8.1

// Copyright 2019. The Tari Project
//
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use crate::transactions::bullet_rangeproofs::BulletRangeProof;
use std::sync::Arc;
use tari_crypto::{
    common::Blake256,
    ristretto::{
        dalek_range_proof::DalekRangeProofService,
        pedersen::{PedersenCommitment, PedersenCommitmentFactory},
        RistrettoPublicKey,
        RistrettoSchnorr,
        RistrettoSecretKey,
    },
};

/// Define the explicit Signature implementation for the Tari base layer. A different signature scheme can be
/// employed by redefining this type.
pub type Signature = RistrettoSchnorr;

/// Define the explicit Commitment implementation for the Tari base layer.
pub type Commitment = PedersenCommitment;
pub type CommitmentFactory = PedersenCommitmentFactory;

/// Define the explicit Secret key implementation for the Tari base layer.
pub type PrivateKey = RistrettoSecretKey;
pub type BlindingFactor = RistrettoSecretKey;

/// Define the hash function that will be used to produce a signature challenge
pub type SignatureHasher = Blake256;

/// Define the explicit Public key implementation for the Tari base layer
pub type PublicKey = RistrettoPublicKey;

/// Specify the Hash function for general hashing
pub type HashDigest = Blake256;

/// Specify the digest type for signature challenges
pub type Challenge = Blake256;

/// The type of output that `Challenge` produces
pub type MessageHash = Vec<u8>;

/// Specify the range proof type
pub type RangeProofService = DalekRangeProofService;

/// Specify the range proof
pub type RangeProof = BulletRangeProof;

/// Define the data type that is used to store results of `HashDigest`
pub type HashOutput = Vec<u8>;

pub const MAX_RANGE_PROOF_RANGE: usize = 64; // 2^64

/// A convenience struct wrapping cryptographic factories that are used through-out the rest of the code base
/// Uses Arcs internally so calling clone on this is cheap, no need to wrap this in an Arc
pub struct CryptoFactories {
    pub commitment: Arc<CommitmentFactory>,
    pub range_proof: Arc<RangeProofService>,
}

impl Default for CryptoFactories {
    /// Return a default set of crypto factories based on Pedersen commitments with G and H defined in
    /// [pedersen.rs](/infrastructure/crypto/src/ristretto/pedersen.rs), and an associated range proof factory with a
    /// range of `[0; 2^64)`.
    fn default() -> Self {
        CryptoFactories::new(MAX_RANGE_PROOF_RANGE)
    }
}

impl CryptoFactories {
    /// Create a new set of crypto factories.
    ///
    /// ## Parameters
    ///
    /// * `max_proof_range`: Sets the the maximum value in range proofs, where `max = 2^max_proof_range`
    pub fn new(max_proof_range: usize) -> Self {
        let commitment = Arc::new(CommitmentFactory::default());
        let range_proof = Arc::new(RangeProofService::new(max_proof_range, &commitment).unwrap());
        Self {
            commitment,
            range_proof,
        }
    }
}

/// Uses Arc's internally so calling clone on this is cheap, no need to wrap this in an Arc
impl Clone for CryptoFactories {
    fn clone(&self) -> Self {
        Self {
            commitment: self.commitment.clone(),
            range_proof: self.range_proof.clone(),
        }
    }
}