Once you've instantiated your wallet in an unlocked state using one of the previously discussed methods, you can sign a message with wallet.sign_message. Below is a full example of how to sign and recover a message.
let mut rng = StdRng::seed_from_u64(2322u64);
let mut secret_seed = [0u8; 32];
rng.fill_bytes(&mut secret_seed);
let secret = secret_seed
.as_slice()
.try_into()
.expect("The seed size is valid");
// Create a wallet using the private key created above.
let wallet = WalletUnlocked::new_from_private_key(secret, None);
let message = "my message";
let signature = wallet.sign_message(message).await?;
// Check if signature is what we expect it to be
assert_eq!(signature, Signature::from_str("0x8eeb238db1adea4152644f1cd827b552dfa9ab3f4939718bb45ca476d167c6512a656f4d4c7356bfb9561b14448c230c6e7e4bd781df5ee9e5999faa6495163d")?);
// Recover address that signed the message
let message = Message::new(message);
let recovered_address = signature.recover(&message)?;
assert_eq!(wallet.address().hash(), recovered_address.hash());
// Verify signature
signature.verify(&recovered_address, &message)?;
Ok(()) You can also sign a transaction by using wallet.sign_transaction. Below is a full example of how to sign and recover a transaction.
let secret = SecretKey::from_str(
"5f70feeff1f229e4a95e1056e8b4d80d0b24b565674860cc213bdb07127ce1b1",
)?;
let mut wallet = WalletUnlocked::new_from_private_key(secret, None);
// Set up a dummy transaction.
let coin = Coin {
amount: 10000000,
owner: wallet.address().clone(),
..Default::default()
};
let input_coin = Input::ResourceSigned {
resource: CoinType::Coin(coin),
witness_index: 0,
};
let output_coin = Output::coin(
Address::from_str(
"0xc7862855b418ba8f58878db434b21053a61a2025209889cc115989e8040ff077",
)?,
1,
Default::default(),
);
let mut tx = ScriptTransactionBuilder::prepare_transfer(
vec![input_coin],
vec![output_coin],
Default::default(),
)
.build()?;
// Sign the transaction.
let consensus_parameters = ConsensusParameters::default();
let test_provider = Provider::new(FuelClient::new("test")?, consensus_parameters);
wallet.set_provider(test_provider);
let signature = wallet.sign_transaction(&mut tx)?;
let message = Message::from_bytes(*tx.id(&consensus_parameters));
// Check if signature is what we expect it to be
assert_eq!(signature, Signature::from_str("c09c82ff0671431cd3dfba9a0ffaaef9474ab0e336fcb3b833dc84108066ed1187c06739d47548b6faa3ee1e83739bb77a4ceb1872f31d1ef26b6cfa45b5a8c0")?);
// Recover address that signed the transaction
let recovered_address = signature.recover(&message)?;
assert_eq!(wallet.address().hash(), recovered_address.hash());
// Verify signature
signature.verify(&recovered_address, &message)?;
Ok(())