Ledger SDK Rust

A modular Rust SDK for communicating with Ledger hardware wallets, featuring comprehensive Ethereum app support including EIP-712 typed data signing.

Features

• Modular Architecture: Clean separation of concerns across multiple crates
• Ethereum Support: Full Ethereum app integration with EIP-712 typed data signing
• Transport Abstraction: Support for multiple transport layers (HID, etc.)
• Type Safety: Strongly typed APIs with comprehensive error handling
• Async Support: Built on async/await for modern Rust applications

Crates

Crate	Description	Version
ledger-sdk-apdu	APDU types and helpers
ledger-sdk-transport	Transport abstraction layer
ledger-sdk-transport-hid	HID transport implementation
ledger-sdk-device-base	Device and app information helpers
ledger-sdk-eth-app	Ethereum app with EIP-712 support

Installation

Add the desired crates to your Cargo.toml:

[dependencies]
ledger-sdk-eth-app = "0.0.1"
ledger-sdk-transport-hid = "0.0.1"

Quick Start

Basic Ethereum Operations

use ledger_sdk_eth_app::EthApp;
use ledger_sdk_transport_hid::TransportNativeHID;
use ledger_sdk_eth_app::types::BipPath;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Create HID transport
    let transport = TransportNativeHID::new()?;

    // Create Ethereum app instance
    let eth_app = EthApp::new();

    // Get address for derivation path
    let path = BipPath::from_string("44'/60'/0'/0/0")?;
    let address = eth_app.get_address(&transport, &path).await?;

    println!("Address: {}", address);
    Ok(())
}

EIP-712 Typed Data Signing

use ledger_sdk_eth_app::EthApp;
use ledger_sdk_eth_app::commands::eip712::SignEip712TypedData;
use serde_json::json;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let transport = TransportNativeHID::new()?;
    let eth_app = EthApp::new();

    // EIP-712 typed data
    let typed_data = json!({
        "domain": {
            "name": "MyApp",
            "version": "1",
            "chainId": 1,
            "verifyingContract": "0x1234567890123456789012345678901234567890"
        },
        "types": {
            "Person": [
                {"name": "name", "type": "string"},
                {"name": "wallet", "type": "address"}
            ]
        },
        "primaryType": "Person",
        "message": {
            "name": "Alice",
            "wallet": "0x1234567890123456789012345678901234567890"
        }
    });

    let path = BipPath::from_string("44'/60'/0'/0/0")?;
    let signature = eth_app.sign_eip712_from_json(&transport, &path, &typed_data.to_string()).await?;

    println!("Signature: {:?}", signature);
    Ok(())
}

Building

# Build all crates
cargo build

# Run tests
cargo test

# Run examples
cargo run --example basic_test

Examples

Check the examples/ directory for more comprehensive usage examples:

• basic_test.rs - Basic Ethereum operations
• usdc_permit_example.rs - USDC permit signing with EIP-712

License

Licensed under the Apache License, Version 2.0. See LICENSE for details.

Attribution

Portions of this code are derived from the Zondax ledger-rs project (Apache-2.0). See NOTICE for details.