signer

alloy-signers

Ethereum signer abstraction.

You can implement the Signer trait to extend functionality to other signers such as Hardware Security Modules, KMS etc. See its documentation for more.

Signer implementations in this crate:

• Private key
• YubiHSM2

Additional signer implementation in Alloy:

• Ledger
• Trezor
• AWS KMS
• GCP KMS

Examples

Sign an Ethereum prefixed message (EIP-712):

use alloy_signer::{LocalWallet, Signer, SignerSync};

// Instantiate the wallet.
let wallet = LocalWallet::random();

// Sign a message.
let message = "Some data";
let signature = wallet.sign_message_sync(message.as_bytes())?;

// Recover the signer from the message.
let recovered = signature.recover_address_from_msg(message)?;
assert_eq!(recovered, wallet.address());
# Ok::<_, Box<dyn std::error::Error>>(())

Sign a transaction:

use alloy_consensus::TxLegacy;
use alloy_primitives::{U256, address, bytes};
use alloy_signer::{LocalWallet, Signer, SignerSync};

// Instantiate the wallet.
let wallet = "dcf2cbdd171a21c480aa7f53d77f31bb102282b3ff099c78e3118b37348c72f7"
    .parse::<LocalWallet>()?;

// Create a transaction.
let mut tx = TxLegacy {
    to: address!("d8dA6BF26964aF9D7eEd9e03E53415D37aA96045").into(),
    value: U256::from(1_000_000_000),
    gas_limit: 2_000_000,
    nonce: 0,
    gas_price: 21_000_000_000,
    input: bytes!(),
    chain_id: Some(1),
};

// Sign it.
let signature = wallet.sign_transaction_sync(&mut tx)?;
# Ok::<_, Box<dyn std::error::Error>>(())