go-ethereum / ecies-parity example

1_encrypt.go

package main

import (
	"crypto/rand"
	"fmt"
	"log"

	"github.com/ethereum/go-ethereum/crypto"
	"github.com/ethereum/go-ethereum/crypto/ecies"
)

var sharedMACData = []byte{0, 0}

func main() {
	key, err := crypto.HexToECDSA("54422e4b3278da00c4cc14b31cbbd1a8e047927735be2d1752ac134b7d9a2fef")
	if err != nil {
		log.Fatal(err)
	}
	data, err := ecies.Encrypt(
		rand.Reader,
		ecies.ImportECDSAPublic(&key.PublicKey),
		[]byte("hello"),
		nil,
		sharedMACData,
	)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("%x\n", data)
}

2_encrypt.sh

$ go run encrypt.go
0403c6817ff2bab5755ea80f809ee0c7da8556d87066f6ba27b910bce190f79c7f75fa0a3d9ef241a02ac0f362910c8f68852f8ede1fa705729c0d237c2a1f5b10cf88aa1b489c0e811f214b89c4b5e0b1baaddfa05acc07dbea813f3f475ad46dc162bc4a2bc2fd6941dae99fc259d3446c881611ce

3_decrypt.js

var privateKey = Buffer.from(
  '54422e4b3278da00c4cc14b31cbbd1a8e047927735be2d1752ac134b7d9a2fef',
  'hex'
);

var encrypted = Buffer.from(
  '0403c6817ff2bab5755ea80f809ee0c7da8556d87066f6ba27b910bce190f79c7f75fa0a3d9ef241a02ac0f362910c8f68852f8ede1fa705729c0d237c2a1f5b10cf88aa1b489c0e811f214b89c4b5e0b1baaddfa05acc07dbea813f3f475ad46dc162bc4a2bc2fd6941dae99fc259d3446c881611ce',
  'hex'
);

require("ecies-parity").decrypt(privateKey, encrypted).then(function(plaintext) {
  console.log("Decrypted:", plaintext.toString());
});

4_decrypt.sh

$ node decrypt.js 
Decrypted: hello