This is a wallet or signer that can be used together with Ethers.js applications.

npm i ethers-gcp-kms-signer

1. Create your asymmetric key as follows: https://cloud.google.com/kms/docs/creating-asymmetric-keys with EC_SIGN_SECP256K1_SHA256 algorithm.

2. Add the new service account to GCP with the correct KMS roles: Crypto KMS Signer, Verifier, Viewer

3. Provide the GCP service account credentials using an environment variable called GOOGLE_APPLICATION_CREDENTIALS here

4. Use the GcpKmsSigner constructor as shown below, and that will resolve the correct key to sign the transaction.

import { GcpKmsSigner } from "ethers-gcp-kms-signer";

const kmsCredentials = {
  projectId: "gcp-project-id", // your project id in gcp
  locationId: "global", // the location where your key ring was created
  keyRingId: "kr-1", // the id of the key ring
  keyId: "key-name", // the name/id of your key in the key ring
  keyVersion: "1", // the version of the key
};

const provider = ethers.providers.getDefaultProvider("ropsten");
let signer = new GcpKmsSigner(kmsCredentials);
signer = signer.connect(provider);

const tx = await signer.sendTransaction({
  to: "0xE94E130546485b928C9C9b9A5e69EB787172952e",
  value: ethers.utils.parseEther("0.01"),
});
console.log(tx);

git clone this repo

$ git clone https://github.com/openlawteam/ethers-gcp-kms-signer my-module
$ cd my-module
$ rm -rf .git
$ npm install # or yarn

Just make sure to edit package.json, README.md and LICENSE files accordingly with your module's info.

$ npm test # run tests with Jest
$ npm run coverage # run tests with coverage
$ npm run lint # lint code
$ npm run build # generate docs and transpile code

This boiler plate uses the semantic-release package to manage versioning. Once it has been set up, version numbers and Github release changelogs will be automatically managed. semantic-release uses the commit messages to determine the type of changes in the codebase. Following formalized conventions for commit messages, semantic-release automatically determines the next semantic version number, generates a changelog and publishes the release.

Use npm run commit instead of git commit in order to invoke Commitizen commit helper that helps with writing properly formatted commit messages.

MIT

All the credits to

• RJ Chow for integrating AWS KMS signer with Ethers.js and share that with everyone at https://github.com/rjchow/ethers-aws-kms-signer

• Lucas Henning for doing the legwork on parsing the AWS KMS signature and public key asn formats: https://luhenning.medium.com/the-dark-side-of-the-elliptic-curve-signing-ethereum-transactions-with-aws-kms-in-javascript-83610d9a6f81