eth-crypto/dist/lib/cipher.js

Cryptographic functions for ethereum and how to use them with web3 and solidity

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.parse = parse;
exports.stringify = stringify;
var _publicKey = require("./public-key");
function stringify(cipher) {
  if (typeof cipher === 'string') return cipher;

  // use compressed key because it's smaller
  var compressedKey = (0, _publicKey.compress)(cipher.ephemPublicKey);
  var ret = Buffer.concat([Buffer.from(cipher.iv, 'hex'),
  // 16bit
  Buffer.from(compressedKey, 'hex'),
  // 33bit
  Buffer.from(cipher.mac, 'hex'),
  // 32bit
  Buffer.from(cipher.ciphertext, 'hex') // var bit
  ]);
  return ret.toString('hex');
}
function parse(str) {
  if (typeof str !== 'string') return str;
  var buf = Buffer.from(str, 'hex');
  var ret = {
    iv: buf.toString('hex', 0, 16),
    ephemPublicKey: buf.toString('hex', 16, 49),
    mac: buf.toString('hex', 49, 81),
    ciphertext: buf.toString('hex', 81, buf.length)
  };

  // decompress publicKey
  ret.ephemPublicKey = '04' + (0, _publicKey.decompress)(ret.ephemPublicKey);
  return ret;
}