eciesgo

Elliptic Curve Integrated Encryption Scheme for secp256k1, written in Go with minimal dependencies.

This is the Go version of ecies/py with a built-in class-like secp256k1 API, you may go there for detailed documentation of the mechanism under the hood.

Install

go get github.com/ecies/go/v2

Go 1.22 is required since 2.0.10.

⚠️ Please use version 2.0.3 and later. It's much faster and safer.

Quick Start

package main

import (
	ecies "github.com/ecies/go/v2"
	"log"
)

func main() {
	k, err := ecies.GenerateKey()
	if err != nil {
		panic(err)
	}
	log.Println("key pair has been generated")

	ciphertext, err := ecies.Encrypt(k.PublicKey, []byte("THIS IS THE TEST"))
	if err != nil {
		panic(err)
	}
	log.Printf("plaintext encrypted: %v\n", ciphertext)

	plaintext, err := ecies.Decrypt(k, ciphertext)
	if err != nil {
		panic(err)
	}
	log.Printf("ciphertext decrypted: %s\n", string(plaintext))
}

Benchmarks

With CGO:

goos: linux
goarch: amd64
pkg: github.com/ecies/go/v2
cpu: AMD Ryzen 7 5700G with Radeon Graphics         
BenchmarkEncrypt-16        12250             98122 ns/op            5185 B/op         61 allocs/op
BenchmarkDecrypt-16        23934             50046 ns/op            4097 B/op         46 allocs/op

Without CGO:

goos: linux
goarch: amd64
pkg: github.com/ecies/go/v2
cpu: AMD Ryzen 7 5700G with Radeon Graphics         
BenchmarkEncrypt-16        10000            112632 ns/op            5655 B/op         68 allocs/op
BenchmarkDecrypt-16        14038             85641 ns/op            4725 B/op         56 allocs/op