Usage

• Instantiate KMS Signer Client
• Getting the public key
• Getting the checksummed address
• Signing legacy transaction
• Signing EIP1559 transaction

Here are some common things you might want to do with eth kms signer.

Instantiate KMS Signer Client

KMS Signer Client can be instantited by providong the region in which the KMS service is located on AWS.

from eth_kms_signer import EthKmsClient

client = EthKmsClient(region_name="aws-kms-region")

Getting the public key

You can retrieve the public key using

pub_key = client.get_public_key(key_id)

Getting the checksummed address

You can also retrieve the checksummed address corresponding to a key id using

checksummed_address = client.get_address(key_id)

Signing legacy transaction

Sign a EIP 155 transaction using:

tx = {
    "nonce": nonce,
    "to": "0x7EeD368F105a6eaC9Ac645bC3440fEa9A6C3D531",
    "value": w3.toWei(12, "wei"),
    "gas": 21000,
    "gasPrice": w3.toWei(1, "gwei"),
    "chainId": "0x4",
}
signed_tx = client.sign_transaction(tx, key_id)
tx_hash = w3.eth.sendRawTransaction(signed_tx)

Signing EIP1559 transaction

Sign a EIP 1559 Dynamic Fee transaction using:

tx = {
    "nonce": nonce,
    "to": "0x7EeD368F105a6eaC9Ac645bC3440fEa9A6C3D531",
    "value": w3.toWei(12, "wei"),
    "gas": 21000,
    "maxFeePerGas": w3.toWei(1, "gwei"),
    "maxPriorityFeePerGas": w3.toWei(1, "gwei"),
    "type": "0x2",
    "chainId": "0x4",
}
signed_tx = client.sign_transaction(tx, key_id)
tx_hash = w3.eth.sendRawTransaction(signed_tx)