Encrypt-Decrypt-2-of-2.js

var crypto = require("crypto");
var eccrypto = require("eccrypto");

var privKeyA = '8331f0e81f21947c516d07d520392cbc3ee891c47fad573904ea2902fe0ecd1b';
var privKeyB = '5aae22750dbf28402d1aad60bb11bffcac2d1fb0cb604d8789c8fd7216af42ee';
var privateKeyA = new Buffer(privKeyA, 'hex');
var publicKeyA = eccrypto.getPublic(privateKeyA);
var privateKeyB = new Buffer(privKeyB, 'hex');
var publicKeyB = eccrypto.getPublic(privateKeyB);

let hexify = function(obj) {
    return {
        iv: obj.iv.toString('hex'),
        ephemPublicKey: obj.ephemPublicKey.toString('hex'),
        ciphertext: obj.ciphertext.toString('hex'),
        mac: obj.mac.toString('hex')
    }
}
let deHexify = function(obj) {
    return {
        iv: new Buffer(obj.iv, 'hex'),
        ephemPublicKey: new Buffer(obj.ephemPublicKey, 'hex'),
        ciphertext: new Buffer(obj.ciphertext, 'hex'),
        mac: new Buffer(obj.mac, 'hex')
    }
}
let decrypt = function(encrypted, hexPrivKeyA, hexPrivKeyB, cb) {
    let privKeyA = new Buffer(hexPrivKeyA, 'hex');
    let privKeyB = new Buffer(hexPrivKeyB, 'hex');
    encrypted = JSON.parse(encrypted);
    encryptedMsg = deHexify(encrypted);
    eccrypto.decrypt(privKeyB, encryptedMsg).then(function(_encryptedMsg) {
        _encryptedMsg = JSON.parse(_encryptedMsg.toString());
        _encryptedMsg = deHexify(_encryptedMsg);
        eccrypto.decrypt(privKeyA, _encryptedMsg).then(function(plaintext) {
            cb(plaintext.toString());
        });
    });
}
let encrypt = function(msg, hexPubKeyA, hexPubKeyB, cb) {
    let pubKeyA = new Buffer(hexPubKeyA, 'hex');
    let pubKeyB = new Buffer(hexPubKeyB, 'hex');
    msg = Buffer(msg);
    eccrypto.encrypt(pubKeyA, msg).then(function(encryptedOnce) {
        eccrypto.encrypt(pubKeyB, JSON.stringify(hexify(encryptedOnce))).then(function(encrypted) {
            cb(JSON.stringify(hexify(encrypted)));
        });
    });
}


encrypt("This is a super long msg", publicKeyA.toString('hex'), publicKeyB.toString('hex'), function(encrypted) {
    decrypt(encrypted, privKeyA, privKeyB, function(decrypted) {
        console.log(decrypted);
    });
});