eth-signer 0.1.5

A Python library for transection signing using AWS Key Management Service.

eth-signer

A Python library for transection signing using AWS Key Management Service.

Dependencies

• Python 3.6+

QuickStart

This Package is available on PyPI. Install via pip as:

  pip install eth-signer

Usage

eth-signer needs AWS-KMS Client Object from boto3 to sign Ethereum transaction or message.

In the following example, the Basic use of eth-signer with boto3 has been given.

import boto3
from eth_signer.signer import AWSKMSKey
from web3 import Web3

# Get a kms_client Object From boto3
kms_client = boto3.client('kms', 'us-east-1')

# Generate new Key Pair using kms_client
new_key = kms.create_key(
    Description='New Eth Key',
    KeyUsage='SIGN_VERIFY',
    KeySpec='ECC_SECG_P256K1',
    Origin='AWS_KMS',
    MultiRegion=False
)

# Use KekId of newly generated key pair for AWSKMSKey Object

key_id = new_key['KeyMetadata']['KeyId']
kms_signer = AWSKMSKey(kms_client, key_id)

web3 = Web3(Web3.HTTPProvider('NODE URL'))
contract = web3.eth.contract(address='TOKEN_ADDRESS', abi=ABI)
nonce = web3.eth.get_transaction_count(kms_signer.address)

tx_obj = contract.functions.function_name().buildTransaction(
     {
          "nonce": nonce,
          "from": kms_signer.address,
     }
)

signed_tx = AWSKMSKey.sign_transaction(tx_obj)
tx_hash = signed_tx.hash
web3.eth.send_raw_transaction(signed_tx.rawTransaction)

Features

• Support for Ethereum Transaction and Message Signing using AWS Key Management Service

Contributors

• Kalpesh Sejpal
• Medium Article from Lucas Henning

Runtime dependencies

The distributed eth-signer contains software from the following projects from PyPi:

• eth-utils
• eth-typing
• hexbytes
• eth-rlp
• pycryptodome
• boto3
• flake8
• isort
• mypy
• Sphinx
• sphinx_rtd_theme
• towncrier
• bumpversion
• setuptools
• tox
• twine