🌳 Merkle Tree

The simple and easy implementation of Rust Merkle Tree

---

Table of Contents

• Credits
• How to install
• How it works
• How to use
• Roadmap
• Contributing
• License

Credits

How to install

cargo add merkletreers

How to works

• We use keccak-256 under-the-hood

This library provides a clean and easy to use implementation of the Merkle Tree with the following features:

• Create Leaf
• Create Root
• Create Proof
• Verify Proof

How to Use

Create a Merkle Tree

use merkletreers::tree::MerkleTree;
use merkletreers::utils::hash_it;

// Hash each element of leaves to convert into a [u8;32]
let leaves = ["a", "b", "c", "d", "e"]
    .iter()
    .map(|data| {
        let mut buffer = [0u8; 32];
        hash_it(data.as_bytes(), &mut buffer);
        buffer
    })
    .collect::<Vec<[u8; 32]>>();

// Create our Merkle tree
let tree = MerkleTree::new(leaves);

Create a Root

use merkletreers::tree::MerkleTree;
use merkletreers::utils::hash_it;

// Hash each element of leaves to convert into a [u8;32]
let leaves = ["a", "b", "c", "d", "e"]
    .iter()
    .map(|data| {
        let mut buffer = [0u8; 32];
        hash_it(data.as_bytes(), &mut buffer);
        buffer
    })
    .collect::<Vec<[u8; 32]>>();

// Create our Merkle tree
let tree = MerkleTree::new(leaves);

// Create our Merkle Root
let root = tree.root;
assert_eq!(
    root,
    [
        29, 208, 210, 166, 174, 70, 109, 102, 92, 178, 110, 26, 49, 240, 124, 87, 174, 93, 247,
        210, 188, 85, 156, 213, 130, 109, 65, 123, 233, 20, 26, 93
    ]
);

Create Proof of a leaf

use merkletreers::node::{Node, Side};
use merkletreers::tree::MerkleTree;
use merkletreers::utils::hash_it;

// Hash each element of leaves to convert into a [u8;32]
let leaves = ["a", "b", "c", "d", "e"]
    .iter()
    .map(|data| {
        let mut buffer = [0u8; 32];
        hash_it(data.as_bytes(), &mut buffer);
        buffer
    })
    .collect::<Vec<[u8; 32]>>();

// Create our Merkle tree
let tree = MerkleTree::new(leaves);

// Create our Merkle Root
let root = tree.root;
assert_eq!(
    root,
    [
        29, 208, 210, 166, 174, 70, 109, 102, 92, 178, 110, 26, 49, 240, 124, 87, 174, 93, 247,
        210, 188, 85, 156, 213, 130, 109, 65, 123, 233, 20, 26, 93
    ]
);

// Create your Merkle Proof for 'c' element
// First we need hash element to convert into a [u8; 32]
let mut leaf = [0u8; 32];
hash_it("c".as_bytes(), &mut leaf);
let proof = tree.make_proof(leaf);
assert_eq!(
    vec![
        Node {
            data: [
                241, 145, 142, 133, 98, 35, 110, 177, 122, 220, 133, 2, 51, 47, 76, 156, 130,
                188, 20, 225, 155, 252, 10, 161, 10, 182, 116, 255, 117, 179, 210, 243
            ],
            side: Side::RIGHT
        },
        Node {
            data: [
                128, 91, 33, 216, 70, 177, 137, 239, 174, 176, 55, 125, 107, 176, 210, 1, 179,
                135, 42, 54, 62, 96, 124, 37, 8, 143, 2, 91, 12, 106, 225, 248
            ],
            side: Side::LEFT
        },
        Node {
            data: [
                168, 152, 44, 137, 216, 9, 135, 251, 154, 81, 14, 37, 152, 30, 233, 23, 2, 6,
                190, 33, 175, 60, 142, 14, 179, 18, 239, 29, 51, 130, 231, 97
            ],
            side: Side::RIGHT
        }
    ],
    proof
);

Verify Proof of a leaf

use merkletreers::node::{Node, Side};
use merkletreers::tree::MerkleTree;
use merkletreers::utils::hash_it;


// Hash each element of leaves to convert into a [u8;32]
let leaves = ["a", "b", "c", "d", "e"]
    .iter()
    .map(|data| {
        let mut buffer = [0u8; 32];
        hash_it(data.as_bytes(), &mut buffer);
        buffer
    })
    .collect::<Vec<[u8; 32]>>();

// Create our Merkle tree
let tree = MerkleTree::new(leaves);

// Create our Merkle Root
let root = tree.root;
assert_eq!(
    root,
    [
        29, 208, 210, 166, 174, 70, 109, 102, 92, 178, 110, 26, 49, 240, 124, 87, 174, 93, 247,
        210, 188, 85, 156, 213, 130, 109, 65, 123, 233, 20, 26, 93
    ]
);

// Create your Merkle Proof for 'c' element
// First we need hash element to convert into a [u8; 32]
let mut leaf = [0u8; 32];
hash_it("c".as_bytes(), &mut leaf);
let proof = tree.make_proof(leaf);
assert_eq!(
    vec![
        Node {
            data: [
                241, 145, 142, 133, 98, 35, 110, 177, 122, 220, 133, 2, 51, 47, 76, 156, 130,
                188, 20, 225, 155, 252, 10, 161, 10, 182, 116, 255, 117, 179, 210, 243
            ],
            side: Side::RIGHT
        },
        Node {
            data: [
                128, 91, 33, 216, 70, 177, 137, 239, 174, 176, 55, 125, 107, 176, 210, 1, 179,
                135, 42, 54, 62, 96, 124, 37, 8, 143, 2, 91, 12, 106, 225, 248
            ],
            side: Side::LEFT
        },
        Node {
            data: [
                168, 152, 44, 137, 216, 9, 135, 251, 154, 81, 14, 37, 152, 30, 233, 23, 2, 6,
                190, 33, 175, 60, 142, 14, 179, 18, 239, 29, 51, 130, 231, 97
            ],
            side: Side::RIGHT
        }
    ],
    proof
);

// Verify our Merkle Proof for 'c' element
let result = tree.check_proof(proof, leaf);
assert_eq!(result, root);

Roadmap

Feature	Status	Priority
Create Root	✅	🔥
Create Proof	✅	🔥
Verify Proof	✅	🔥
Compatible with MerkleTreeJs	✅	🔥
Compatible with Merkly	✅	🔥
Leafs of any size	✅	🧐
Use any Hash function	⏰	🧐

Contributing

• Before read a code of conduct: CODE_OF_CONDUCT
• Follow the guide of development: CONTRIBUTING

License

MIT