Ecies

ecies.js

const { privateDecrypt } = require('crypto');
const eccrypto = require('eccrypto');

const oldPrivateKey = '-----BEGIN PRIVATE KEY-----\n' +
  ///PRIVATE KEY CODE
  '-----END PRIVATE KEY-----';
const data = 'some base64';
const decryptpedDoc = privateDecrypt(oldPrivateKey, Buffer.from(data, 'base64'));
const decryptpedDocString = decryptpedDoc.toString();

const privateKeyA = eccrypto.generatePrivate();
console.log(privateKeyA.toString('hex'));


const publicKeyA = eccrypto.getPublic(privateKeyA);
console.log(publicKeyA.toString('hex'));

const privateKeyB = eccrypto.generatePrivate();

console.log(privateKeyB.toString('hex'));

const publicKeyB = eccrypto.getPublic(privateKeyB);
console.log(publicKeyB.toString('hex'));

// Encrypting the message for B.
eccrypto.encrypt(publicKeyB, Buffer.from(decryptpedDocString)).then(function (encrypted) {
  // B decrypting the message.
  eccrypto.decrypt(privateKeyB, encrypted).then(function (plaintext) {
    console.log('Message to part B:', plaintext.toString());
  });
});

// Encrypting the message for A.
eccrypto.encrypt(publicKeyA, Buffer.from(decryptpedDocString)).then(function (encrypted) {
  // A decrypting the message.
  eccrypto.decrypt(privateKeyA, encrypted).then(function (plaintext) {
    console.log('Message to part A:', plaintext.toString());
  });
});