├── .gitignore
├── Cargo.lock
├── Cargo.toml
├── README.md
└── src
    ├── eth_wallet.rs
    ├── main.rs
    └── utils.rs


/.gitignore:
--------------------------------------------------------------------------------
1 | /target
2 | crypto_wallet.json
3 | .env


--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | name = "rust-eth-crypto-wallet"
 3 | version = "0.1.0"
 4 | edition = "2021"
 5 | 
 6 | # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 7 | 
 8 | [dependencies]
 9 | anyhow = "1.0"
10 | dotenv = "0.15.0"
11 | secp256k1 = { version = "0.20.3", features = ["rand"] }
12 | tokio = { version= "1", features = ["full"] }
13 | web3 = "0.17.0"
14 | serde = { version = "1.0", features = ["derive"]}
15 | serde_json = "1.0"
16 | tiny-keccak = { version = "1.4" }
17 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # Build a crypto wallet using Rust
 2 | 
 3 | This repository shows an example of how to implement a simple crypto currency wallet using Rust. This example is for educational purposes.
 4 | 
 5 | On my blog I explain the whole process of building this project: [Build a crypto wallet using Rust: steps how to](https://tms-dev-blog.com/build-a-crypto-wallet-using-rust/).
 6 | 
 7 | The wallet can generate a secret key, public key and public address. Furthermore it shows the balance for the wallet's address. An example of sending Eth from the wallet to a different address is also shown.
 8 | 
 9 | ## Set up and run
10 | 
11 | In order to run the project a `.env` file is required containing an endpoint for connecting to an Ethereum network using WebSockets. For example:
12 | 
13 | ```
14 | INFURA_RINKEBY_WS=wss://rinkeby.infura.io/ws/v3/08xxxxxxxxx
15 | ```
16 | 
17 | The `INFURA_RINKEBY` value is an endpoint address from [infura.io](https://infura.io), however it can be any valid address to an Ethereum network WebSocket endpoint.
18 | 
19 | Infura.io is an easy way to gain access to an Ethereum node endpoint.


--------------------------------------------------------------------------------
/src/eth_wallet.rs:
--------------------------------------------------------------------------------
  1 | use crate::utils;
  2 | use anyhow::Result;
  3 | use secp256k1::{rand::rngs, PublicKey, SecretKey};
  4 | use serde::{Deserialize, Serialize};
  5 | use std::io::BufWriter;
  6 | use std::str::FromStr;
  7 | use std::{fs::OpenOptions, io::BufReader};
  8 | use tiny_keccak::keccak256;
  9 | use web3::{
 10 |     transports,
 11 |     types::{Address, TransactionParameters, H256, U256},
 12 |     Web3,
 13 | };
 14 | 
 15 | pub fn generate_keypair() -> (SecretKey, PublicKey) {
 16 |     let secp = secp256k1::Secp256k1::new();
 17 |     let mut rng = rngs::JitterRng::new_with_timer(utils::get_nstime);
 18 |     secp.generate_keypair(&mut rng)
 19 | }
 20 | 
 21 | pub fn public_key_address(public_key: &PublicKey) -> Address {
 22 |     let public_key = public_key.serialize_uncompressed();
 23 |     debug_assert_eq!(public_key[0], 0x04);
 24 |     let hash = keccak256(&public_key[1..]);
 25 | 
 26 |     Address::from_slice(&hash[12..])
 27 | }
 28 | 
 29 | #[derive(Serialize, Deserialize, Debug)]
 30 | pub struct Wallet {
 31 |     pub secret_key: String,
 32 |     pub public_key: String,
 33 |     pub public_address: String,
 34 | }
 35 | 
 36 | impl Wallet {
 37 |     pub fn new(secret_key: &SecretKey, public_key: &PublicKey) -> Self {
 38 |         let addr: Address = public_key_address(&public_key);
 39 |         Wallet {
 40 |             secret_key: format!("{}", secret_key.to_string()),
 41 |             public_key: public_key.to_string(),
 42 |             public_address: format!("{:?}", addr),
 43 |         }
 44 |     }
 45 | 
 46 |     pub fn save_to_file(&self, file_path: &str) -> Result<()> {
 47 |         let file = OpenOptions::new()
 48 |             .write(true)
 49 |             .create(true)
 50 |             .open(file_path)?;
 51 |         let buf_writer = BufWriter::new(file);
 52 | 
 53 |         serde_json::to_writer_pretty(buf_writer, self)?;
 54 | 
 55 |         Ok(())
 56 |     }
 57 | 
 58 |     pub fn from_file(file_path: &str) -> Result<Wallet> {
 59 |         let file = OpenOptions::new().read(true).open(file_path)?;
 60 |         let buf_reader = BufReader::new(file);
 61 | 
 62 |         let wallet: Wallet = serde_json::from_reader(buf_reader)?;
 63 |         Ok(wallet)
 64 |     }
 65 | 
 66 |     pub fn get_secret_key(&self) -> Result<SecretKey> {
 67 |         let secret_key = SecretKey::from_str(&self.secret_key)?;
 68 |         Ok(secret_key)
 69 |     }
 70 | 
 71 |     pub fn get_public_key(&self) -> Result<PublicKey> {
 72 |         let pub_key = PublicKey::from_str(&self.public_key)?;
 73 |         Ok(pub_key)
 74 |     }
 75 | 
 76 |     pub async fn get_balance(&self, web3_connection: &Web3<transports::WebSocket>) -> Result<U256> {
 77 |         let wallet_address = Address::from_str(&self.public_address)?;
 78 |         let balance = web3_connection.eth().balance(wallet_address, None).await?;
 79 | 
 80 |         Ok(balance)
 81 |     }
 82 | 
 83 |     pub async fn get_balance_in_eth(
 84 |         &self,
 85 |         web3_connection: &Web3<transports::WebSocket>,
 86 |     ) -> Result<f64> {
 87 |         let wei_balance = self.get_balance(web3_connection).await?;
 88 |         Ok(utils::wei_to_eth(wei_balance))
 89 |     }
 90 | }
 91 | 
 92 | pub async fn establish_web3_connection(url: &str) -> Result<Web3<transports::WebSocket>> {
 93 |     let transport = transports::WebSocket::new(url).await?;
 94 |     Ok(Web3::new(transport))
 95 | }
 96 | 
 97 | pub fn create_eth_transaction(to: Address, eth_value: f64) -> TransactionParameters {
 98 |     TransactionParameters {
 99 |         to: Some(to),
100 |         value: utils::eth_to_wei(eth_value),
101 |         ..Default::default()
102 |     }
103 | }
104 | 
105 | pub async fn sign_and_send(
106 |     web3: &Web3<transports::WebSocket>,
107 |     transaction: TransactionParameters,
108 |     secret_key: &SecretKey,
109 | ) -> Result<H256> {
110 |     let signed = web3
111 |         .accounts()
112 |         .sign_transaction(transaction, secret_key)
113 |         .await?;
114 | 
115 |     let transaction_result = web3
116 |         .eth()
117 |         .send_raw_transaction(signed.raw_transaction)
118 |         .await?;
119 |     Ok(transaction_result)
120 | }
121 | 


--------------------------------------------------------------------------------
/src/main.rs:
--------------------------------------------------------------------------------
 1 | use anyhow::Result;
 2 | mod eth_wallet;
 3 | mod utils;
 4 | use std::env;
 5 | use std::str::FromStr;
 6 | use web3::types::Address;
 7 | 
 8 | #[tokio::main]
 9 | async fn main() -> Result<()> {
10 |     dotenv::dotenv().ok();
11 |     let (secret_key, pub_key) = eth_wallet::generate_keypair();
12 | 
13 |     println!("secret key: {}", &secret_key.to_string());
14 |     println!("public key: {}", &pub_key.to_string());
15 | 
16 |     let pub_address = eth_wallet::public_key_address(&pub_key);
17 |     println!("public address: {:?}", pub_address);
18 | 
19 |     // let crypto_wallet = eth_wallet::Wallet::new(&secret_key, &pub_key);
20 |     // println!("crypto_wallet: {:?}", &crypto_wallet);
21 | 
22 |     let wallet_file_path = "crypto_wallet.json";
23 |     // crypto_wallet.save_to_file(wallet_file_path)?;
24 | 
25 |     let loaded_wallet = eth_wallet::Wallet::from_file(wallet_file_path)?;
26 |     println!("loaded_wallet: {:?}", loaded_wallet);
27 | 
28 |     let endpoint = env::var("INFURA_RINKEBY_WS")?;
29 |     let web3_con = eth_wallet::establish_web3_connection(&endpoint).await?;
30 | 
31 |     let block_number = web3_con.eth().block_number().await?;
32 |     println!("block number: {}", &block_number);
33 | 
34 |     let balance = loaded_wallet.get_balance_in_eth(&web3_con).await?;
35 |     println!("wallet balance: {} eth", &balance);
36 | 
37 |     // let transaction =
38 |     //     eth_wallet::create_eth_transaction(Address::from_str("0x4fill in address here")?, 0.01);
39 |     // let transact_hash =
40 |     //     eth_wallet::sign_and_send(&web3_con, transaction, &loaded_wallet.get_secret_key()?).await?;
41 | 
42 |     // println!("transaction hash: {:?}", transact_hash);
43 | 
44 |     Ok(())
45 | }
46 | 


--------------------------------------------------------------------------------
/src/utils.rs:
--------------------------------------------------------------------------------
 1 | use std::time::{SystemTime, UNIX_EPOCH};
 2 | use web3::types::U256;
 3 | 
 4 | pub fn get_nstime() -> u64 {
 5 |     let dur = SystemTime::now().duration_since(UNIX_EPOCH).unwrap();
 6 |     // The correct way to calculate the current time is
 7 |     // `dur.as_secs() * 1_000_000_000 + dur.subsec_nanos() as u64`
 8 |     // But this is faster, and the difference in terms of entropy is
 9 |     // negligible (log2(10^9) == 29.9).
10 |     dur.as_secs() << 30 | dur.subsec_nanos() as u64
11 | }
12 | 
13 | pub fn wei_to_eth(wei_val: U256) -> f64 {
14 |     let res = wei_val.as_u128() as f64;
15 |     res / 1_000_000_000_000_000_000.0
16 | }
17 | 
18 | pub fn eth_to_wei(eth_val: f64) -> U256 {
19 |     let result = eth_val * 1_000_000_000_000_000_000.0;
20 |     let result = result as u128;
21 | 
22 |     U256::from(result)
23 | }
24 | 


--------------------------------------------------------------------------------