1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136

// Copyright (C) 2019-2020 Aleo Systems Inc.
// This file is part of the snarkOS library.

// The snarkOS 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 snarkOS 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 snarkOS library. If not, see <https://www.gnu.org/licenses/>.

pub mod merkle_path;
pub use merkle_path::*;

pub mod merkle_tree;
pub use merkle_tree::*;

#[cfg(test)]
pub mod tests;

use rand::{Rng, SeedableRng};

// TODO: How should this seed be chosen?
const PRNG_SEED: [u8; 32] = [
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
];

// PRNG to instantiate the Merkle Tree parameters
pub fn prng() -> impl Rng {
    rand_chacha::ChaChaRng::from_seed(PRNG_SEED)
}

#[macro_export]
/// Defines a Merkle tree using the provided hash and depth.
macro_rules! define_merkle_tree_parameters {
    ($struct_name:ident, $hash:ty, $depth:expr) => {
        #[allow(unused_imports)]
        use snarkos_models::algorithms::{LoadableMerkleParameters, MaskedMerkleParameters, MerkleParameters, CRH};
        #[allow(unused_imports)]
        use $crate::merkle_tree::MerkleTree;

        #[allow(unused_imports)]
        use rand::Rng;

        #[derive(Clone, PartialEq, Eq, Debug)]
        pub struct $struct_name($hash);

        impl MerkleParameters for $struct_name {
            type H = $hash;

            const DEPTH: usize = $depth;

            fn setup<R: Rng>(rng: &mut R) -> Self {
                Self(Self::H::setup(rng))
            }

            fn crh(&self) -> &Self::H {
                &self.0
            }

            fn parameters(&self) -> &<Self::H as CRH>::Parameters {
                self.crh().parameters()
            }
        }

        impl From<$hash> for $struct_name {
            fn from(crh: $hash) -> Self {
                Self(crh)
            }
        }

        impl LoadableMerkleParameters for $struct_name {}

        impl Default for $struct_name {
            fn default() -> Self {
                Self(<Self as MerkleParameters>::H::setup(
                    &mut $crate::merkle_tree::prng(),
                ))
            }
        }
    };
}

#[macro_export]
macro_rules! define_masked_merkle_tree_parameters {
    ($struct_name:ident, $hash:ty, $depth:expr) => {
        #[allow(unused_imports)]
        use snarkos_models::algorithms::{CRHParameters, MaskedMerkleParameters, MerkleParameters, CRH};
        #[allow(unused_imports)]
        use $crate::merkle_tree::MerkleTree;

        #[allow(unused_imports)]
        use rand::Rng;

        #[derive(Clone, PartialEq, Eq, Debug)]
        pub struct $struct_name($hash, <$hash as CRH>::Parameters);

        impl MerkleParameters for $struct_name {
            type H = $hash;

            const DEPTH: usize = $depth;

            fn setup<R: Rng>(rng: &mut R) -> Self {
                Self(Self::H::setup(rng), <Self::H as CRH>::Parameters::setup(rng))
            }

            fn crh(&self) -> &Self::H {
                &self.0
            }

            fn parameters(&self) -> &<Self::H as CRH>::Parameters {
                self.crh().parameters()
            }
        }

        impl MaskedMerkleParameters for $struct_name {
            fn mask_parameters(&self) -> &<Self::H as CRH>::Parameters {
                &self.1
            }
        }

        impl Default for $struct_name {
            fn default() -> Self {
                Self(
                    <Self as MerkleParameters>::H::setup(&mut $crate::merkle_tree::prng()),
                    <<Self as MerkleParameters>::H as CRH>::Parameters::setup(&mut $crate::merkle_tree::prng()),
                )
            }
        }
    };
}