Ethereum AWS KMS Signer

A Go utility to sign Ethereum messages using AWS KMS, with support for message hashing and ECDSA signature adjustments according to Ethereum standards.

Features

• Retrieve public keys from AWS KMS and convert them to Ethereum addresses.
• Generate Ethereum-compatible message hashes.
• Sign messages using AWS KMS.
• Adjust ECDSA signatures to meet Ethereum standards.

Prerequisites

• Go 1.16+
• AWS SDK for Go
• AWS KMS setup with a suitable key
• Environment variables for AWS configuration

Installation

1. Clone the repository:

   ``` git clone https://github.com/Jamill-hallak/ethereum-aws-kms-signer.git

   cd ethereum-aws-kms-signer ```

2. Install dependencies:

   ``` go mod tidy ```

Configuration

Create a .env file in the root directory with the following content:

``` AWS_REGION= your-aws-region AWS_KMS_KEY_ID= your-kms-key-id AWS_ACCESS_KEY_ID= your-access-key-id AWS_SECRET_ACCESS_KEY= your-secret-access-key ```

Usage

Running the Application

``` go run main.go ```

Example Output

``` Authorized Signer Address: 0xYourSignerAddress Message Hash: 0xYourMessageHash EthSignedMessage Hash: 0xYourEthSignedMessageHash Signature: 0xYourSignature ```

Code Overview

main.go

The entry point of the application. It loads environment variables, retrieves the public key from AWS KMS, generates message hashes, and signs the message.

aws/kms.go

Contains the function to initialize the AWS KMS client using credentials from environment variables.

aws/kms_utils.go

Contains utility functions related to AWS KMS operations, such as retrieving public keys and signing messages.

ethereum/eth_utils.go

Contains utility functions related to Ethereum operations, such as generating message hashes and converting public keys to Ethereum addresses.

ethereum/eth_signer.go

Handles Ethereum signature adjustments to conform to Ethereum's standards, including adjusting the S value and determining the recovery ID.

Contributing

Feel free to submit issues, fork the repository, and send pull requests. We welcome all contributions!

License

This project is licensed under the MIT License.