start.md

Setup

npm install -g coffee-script
npm install bitcore-lib bitcore-ecies

Decode

coffee test.coffee decode 7jDFoiJz...(base58 message)

Encode

coffee test.coffee encode "Hello, world!" KzEad1...(private key)

test.coffee

#!coffee

vm = require 'vm'
{ PrivateKey, encoding } = require 'bitcore-lib'
ECIES = require 'bitcore-ecies'

[_, __, method, input, privateKey] = process.argv

if not input
  throw 'input is empty!'

switch method
  when 'decode'
    decoded = encoding.Base58.decode input
    sandbox = vm.createContext {
      encryptMethod: ''
      decryptKey: ''
      encryptedMsg: ''
    }
    vm.runInContext decoded, sandbox
    if sandbox.encryptMethod isnt 'ecies'
      throw 'unsupported encrypt method!'
    key = new PrivateKey(sandbox.decryptKey or privateKey)
    msg = new Buffer sandbox.encryptedMsg, 'base64'
    decrypted = ECIES().privateKey(key).publicKey(key.publicKey).decrypt(msg)
    console.log decrypted.toString 'utf-8'

  when 'encode'
    if not privateKey
      throw 'private key is required!'
    buffer = new Buffer input, 'utf-8'
    key = new PrivateKey privateKey
    encrypted = ECIES().privateKey(key).publicKey(key.publicKey).encrypt(buffer)
    struct = [
      "encryptMethod='ecies';"
      "decryptKey='#{key.toWIF()}';"
      "encryptedMsg='#{encrypted.toString('base64')}';"
    ].join ''
    output = encoding.Base58.encode new Buffer(struct)
    console.log output