crypto-keystore-rs

[!WARNING] This repo has not been audited -- use at your own risk!

A multi-chain keystore library for Rust supporting Ethereum and Solana with the Web3 Secret Storage format.

This library extends the core web3 keystore spec ref but supports address schemes other than Ethereum.

• Docs
• Crate

Features

• Multi-chain support: Ethereum (secp256k1) and Solana (Ed25519) keys
• Web3 compatibility: Supports Web3 Secret Storage format v3 (Ethereum) and v4 (chain-neutral)
• Secure: Uses audited cryptographic libraries from RustCrypto
• Zero-copy: Keys are zeroized on drop to prevent memory leaks
• Opt-in functionality: Only compile what you need (ethereum, solana, or both)

Installation

Add this to your Cargo.toml:

[dependencies]
crypto-keystore-rs = "0.1"

Feature Flags

By default, both Ethereum and Solana support are enabled. You can opt into specific chains:

[dependencies]
# Only Ethereum
crypto-keystore-rs = { version = "0.1", default-features = false, features = ["ethereum"] }

# Only Solana
crypto-keystore-rs = { version = "0.1", default-features = false, features = ["solana"] }

# Both (default)
crypto-keystore-rs = "0.1"

Usage

Ethereum Example

use crypto_keystore_rs::{EthereumKeystore, ChainKey};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let password = "secure_password_123";

    // Create a new Ethereum keystore with a random key
    let keystore = EthereumKeystore::new(password)?;
    let address = keystore.key()?.public_key();
    println!("Ethereum address: {}", address);

    // Save to file
    let uuid = keystore.save_to_file("./keystores")?;
    println!("Saved keystore with ID: {}", uuid);

    // Load from file
    let loaded = EthereumKeystore::load_from_file(
        format!("./keystores/{}.json", uuid),
        password
    )?;

    assert_eq!(loaded.key()?.public_key(), address);

    Ok(())
}

Solana Example

use crypto_keystore_rs::{SolanaKeystore, ChainKey};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let password = "secure_password_123";

    // Create a new Solana keystore with a random key
    let keystore = SolanaKeystore::new(password)?;
    let address = keystore.key()?.public_key();
    println!("Solana address: {}", address);

    // Save to file
    let uuid = keystore.save_to_file("./keystores")?;
    println!("Saved keystore with ID: {}", uuid);

    // Load from file
    let loaded = SolanaKeystore::load_from_file(
        format!("./keystores/{}.json", uuid),
        password
    )?;

    assert_eq!(loaded.key()?.public_key(), address);

    Ok(())
}

Architecture

ChainKey Trait

The library uses a trait-based design in order to encapsulate different key encodings on a per chain/VM basis.

pub trait ChainKey: Sized {
    const SECRET_KEY_SIZE: usize;
    const KEYSTORE_SIZE: usize;
    const CHAIN_ID: &'static str;

    fn to_keystore_bytes(&self) -> Vec<u8>;
    fn from_keystore_bytes(bytes: &[u8]) -> Result<Self>;
    fn generate<R: RngCore + CryptoRng>(rng: &mut R) -> Self;
    fn public_key(&self) -> String;
    fn mac_algorithm() -> MacAlgorithm;
}

Keystore Format

The library uses a JSON-based keystore format inspired by the Web3 Secret Storage Definition, but extended to support chains other than Ethereum.:

Version 4 (Chain-neutral):

{
  "crypto": {
    "cipher": "aes-128-ctr",
    "cipherparams": { "iv": "..." },
    "ciphertext": "...",
    "kdf": "scrypt",
    "dklen": 32,
    "n": 262144,
    "p": 1,
    "r": 8,
    "salt": "...",
    "mac": "..."
  },
  "id": "uuid-v4",
  "version": 4,
  "chain": "ethereum"
}

Version 3 (Ethereum backward compatible):

The library can also read standard Ethereum Web3 Secret Storage v3 keystores.

Development

Building

make build          # Build the library
make release        # Build optimized release
make test           # Run tests
make check          # Run fmt, clippy, tests
make fix            # Auto-fix formatting and clippy warnings

Running Tests

cargo test                                     # All tests
cargo test --no-default-features --features ethereum  # Ethereum only
cargo test --no-default-features --features solana    # Solana only