March 20, 2021

How to generate a new Ethereum address in Go

Overview

Golang is very popular among backend developers for building infrastructures and microservices. Go is a procedural programming language. Developed in 2007 by Robert Griesemer, Rob Pike, and Ken Thompson at Google, then launched in 2009 as an open-source programming language, Go is efficient for managing dependencies. Programs in Go are assembled by using packages.
Go has gained a lot of market share in past years and is currently used by major corporations. In this guide, we will cover creating an Ethereum address in Go using the Go-Ethereum Client library.


For our purposes today, we’ll use crypto and common packages of go-ethereum.

Prerequisites
  • Go version 1.13 or above installed.
  • A text editor
  • CLI

What is an Ethereum address?

Authentication on any internet platform requires a username and password. You can think of an Ethereum address as your username, with the corresponding private key as your password (that you do not need to memorize). An Ethereum address is your unique identity on the blockchain, and it looks like this “0x6E0d01A76C3Cf4288372a29124A26D4353EE51BE”. The actual address is public and can be shared, but your private key must obviously be kept secret.  Your own Ethereum address is required for at least the following operations on the ETH network.

  • Receiving/Sending ETH currency
  • Signing/Sending transactions
  • Connecting to Applications

The following outlines the process of generating an Ethereum address using a private key.

  • A random private key of 64 (hex) characters (256 bits / 32 bytes) is generated first. 
    For example: 
0xf4a2b939592564feb35ab10a8e04f6f2fe0943579fb3c9c33505298978b74893

  •  A 128 (hex) character (64 bytes) public key is then derived from the generated private key using Elliptic Curve Digital Signature Algorithm (ECDSA). 
    For example: 
0x04345f1a86ebf24a6dbeff80f6a2a574d46efaa3ad3988de94aa68b695f09db9ddca37439f99548da0a1fe4acf4721a945a599a5d789c18a06b20349e803fdbbe3

  • The Keccak-256 hash function is then applied to (128 characters / 64 bytes) the public key to obtain a 64 character (32 bytes) hash string. The last 40 characters / 20 bytes of this string prefixed with 0x become the final Ethereum address. 
    For example:
0xd5e099c71b797516c10ed0f0d895f429c2781142

What is go-ethereum?

go-ethereum is the official GOlang implementation of Ethereum used to develop Ethereum nodes. go-ethereum has many packages for interactions and transactions with the Ethereum blockchain in Go.

Let’s see how we can easily generate a new Ethereum address in Go.

Generating an Ethereum address in Go

The first step here will be to check if Go is installed on our system. To do so, copy-paste the following in your terminal/cmd:

$ go version

If Go is not installed, follow the official installation guide for your specific OS.

Make sure you have the GCC compiler installed as well. 
For Ubuntu - use apt-get install build-essentials

For Mac - using homebrew
$ brew install gcc
another faster option is getting XCode Command Line Tools using 
$ xcode-select --install

If you’re not familiar with Go, we recommend running their interactive tutorial to cover the basic syntax, methods, and concurrency handling. There are some exercises you can run without leaving your environment. Simply type the command below into your command line/terminal to run the tutorial locally:
$ go get golang.org/x/tour
Now type:
$ tour

Start by creating a file named address.go and copy-paste the following code into it. This code will create a private key, a public key using the private key, and an Ethereum address.

package main

import (
    "crypto/ecdsa"
    "fmt"
    "log"

    "github.com/ethereum/go-ethereum/common/hexutil"
    "github.com/ethereum/go-ethereum/crypto"
)

func main() {
    privateKey, err := crypto.GenerateKey()
    if err != nil {
        log.Fatal(err)
    }

    privateKeyBytes := crypto.FromECDSA(privateKey)
    fmt.Println("SAVE BUT DO NOT SHARE THIS (Private Key):", hexutil.Encode(privateKeyBytes))

    publicKey := privateKey.Public()
    publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey)
    if !ok {
        log.Fatal("cannot assert type: publicKey is not of type *ecdsa.PublicKey")
    }

    publicKeyBytes := crypto.FromECDSAPub(publicKeyECDSA)
    fmt.Println("Public Key:", hexutil.Encode(publicKeyBytes)) 

    address := crypto.PubkeyToAddress(*publicKeyECDSA).Hex()
    fmt.Println("Address:", address)
}

Explanation of the code above

Line 1-10: Declaring the main package and adding necessary dependencies required to generate keys and address.

Line 12: Invoking the main function.

Line 13: Generating a random private key using the GenerateKey method from the crypto package.

Line 14-16: Checking for errors.

Line 18: Converting the private key to bytes using the FromECDSA method of the crypto/ecdsa package.

Line 19: Converting the private key to a hexadecimal string using the Encode method of hexutil package and printing the new string with a warning message.

Line 21: Generating a Public key from the Private key using the Public method of crypto package.

Line 22-28: Checking the type of Public key and then converting it to a hexadecimal string using the same process we saw for the Private key and printing the Public Key with a message.

Line 30: Generating an Ethereum address using PubkeyToAddress method of the crypto package, which accepts ECDSA public key, and returns an Ethereum address and storing it in a variable address.

Line 31: Printing the address along with a message “Address:”

Next, let’s create a module to track dependencies. If you’re not familiar with go, this is an essential step in setting up your project’s dependencies. With Go it’s relatively easy.
 
Simply type:

$ go mod init address

This will ensure the crypto and common packages included in your code are downloaded from GitHub and installed locally. It happens automatically, and the latest version should be pulled into your environment along with built-in Go modules. 

Now, let’s run our module.

$ go run address.go 

If you followed the instructions correctly and everything goes right, it must output something like this. The first line displays the private key, the Public key is second, and the third line displays your Ethereum address.


Conclusion

Congratulations on creating a new Ethereum address with Go. This address can be used to interact with the Ethereum blockchain network and perform various operations. Look out for more easy-to-follow guides from QuikNode - your provider of affordable and lightning-fast Ethereum nodes. Learn how to get started with QuikNode and spin up your own Ethereum node in minutes and build the next big dApp!

Subscribe to our newsletter for more articles and guides on Ethereum. If you have any feedback, feel free to reach out to us via Twitter. You can always chat with us on our Discord community server, featuring some of the coolest developers you’ll ever meet :)
Ready to try QuikNode? Start your 7-day free trial

Related articles 16

Mar 20, 2021 How to connect to Ethereum using .NET (Nethereum)

Dotnet or .NET is very popular for the development of desktop applications, most Windows desktop applications are built using .NET, and it also contributes largely to web application’s tech stack. In this guide, let’s see how we can connect to Ethereum using .NET and

Continue reading
Mar 20, 2021 How to fetch Ethereum event logs in Ruby

Ethereum log records are very useful to understand and keep track of smart contract events. In this guide, we are going to learn how to fetch ethereum event logs in Ruby using ethereum.rb ruby...

Continue reading
Mar 20, 2021 How to generate a new Ethereum address in Python

Python is one of the most versatile programming languages out there with an abundance of use cases; We can build many applications with Python from client-side to back end. In this guide, we will cover creating an Ethereum address in Python using the

Continue reading
Mar 20, 2021 How to generate a new Ethereum address in JavaScript

When it comes to programming, there’s hardly anyone who has not used or heard about JavaScript. JavaScript was initially created for client-side scripting but has become a full-featured Object-Oriented...

Continue reading
Mar 20, 2021 How to connect to the Ethereum network using Ruby

Ruby has a huge fanbase. Ruby was developed by its creator with an intention to create a language people can have fun using. Ruby has been largely accepted by the developers all around the world since it’s launch, in fact, the biggest tech communities in many cities are...

Continue reading
Mar 20, 2021 How to connect to the Ethereum network using Python using Web3.py

You can build Ethereum applications in different programming languages. In this article, we will connect to the Ethereum network using Python.PrerequisiteEthereum Node (We will use QuikNode’s free...

Continue reading
Mar 20, 2021 How to connect to Ethereum network with ethers.js

When someone thinks of developing a dApp the first tool that comes to their mind is web3.js which is pretty common because of its popularity in the community and wide use cases, dApp development has been consistently growing and there are a lot of developers who want to...

Continue reading
Mar 20, 2021 How to re-send a transaction with higher gas price using ethers.js

Sometimes, you submit a transaction on Ethereum without enough gas due to network congestion or too many pending transactions offering a higher gas price than you have offered on your transaction. If you have a high priority transaction but low gas, you could end up...

Continue reading
Mar 20, 2021 How to connect to Ethereum network with Web3.js

Libraries and frameworks make the development process a lot easier and faster. When it comes to Ethereum development, Web3.js is the go to library. That's because Web3.js is the official library, from the

Continue reading
Mar 20, 2021 How to use Subspace with QuikNode

In this guide, we'll understand a bit about reactive development and how to use Subspace with QuikNode.JavaScript is the programming language behind most of the internet apps and websites. JavaScript today has become one of the most used programming languages, and...

Continue reading
Mar 20, 2021 How to generate a new Ethereum address in Ruby

With high usage in web applications and straightforward syntax, Ruby is used by a vast number of people. This guide will cover creating an Ethereum address in Ruby using ruby-eth...

Continue reading
Mar 20, 2021 How to connect to Ethereum network using Java / Web3j

We can say that Java is one of the most versatile languages out there, and it continues to be relevant in today's time. Java is so popular because of its massive user base and use cases. In this guide/tutorial, we'll learn how to connect to the Ethereum Blockchain network...

Continue reading
Mar 31, 2021 How to generate a new Ethereum address in PHP

PHP is very popular in developing the backend of websites or web applications. PHP has a huge crowd of developers trusting it as their go-to language. In this guide, we will see how we can generate a new Ethereum address in...

Continue reading
Apr 13, 2021 How to Fork Ethereum Blockchain with Ganache.

Forking and running a local simulated Ethereum environment is essential if you want to work with DeFi or do Ethereum development in general. In this guide, we’ll cover how to fork Ethereum Blockchain with

Continue reading
Mar 20, 2021 Estimating gas price using pending transactions in Python

To send a transaction on the Ethereum network, you need to pay fees for including the transaction in a block as well as the computation necessary in the transaction; this fee is called gas. The transactions are accepted into the block based on the amount of gas they are...

Continue reading
Mar 20, 2021 How to connect to Ethereum network using Go

Go helps you make faster scalable backends and this guide will show you how to connect your backend to Ethereum (and make it even faster, more reliable, and globally accessible, all thanks to QuikNode’s global infrastructure). What is...

Continue reading