crypty/lib/index.js

Simple encryption and decryption.

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.isSecretValid = exports.ivFromSecret = undefined;
exports.encrypt = encrypt;
exports.decrypt = decrypt;

var _crypto = require('crypto');

var _crypto2 = _interopRequireDefault(_crypto);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

var algorithm = 'aes-256-cbc';

var ivFromSecret = exports.ivFromSecret = function ivFromSecret(secret) {
  return secret.slice(0, 16);
};
var isSecretValid = exports.isSecretValid = function isSecretValid(secret) {
  return !!secret && secret.length === 32;
};

function encrypt(text, secret) {
  if (!isSecretValid(secret)) {
    throw new Error('Secret must have 32 bytes.');
  }
  var cipher = _crypto2.default.createCipheriv(algorithm, secret, ivFromSecret(secret));
  var crypted = cipher.update(text, 'utf8', 'hex');
  crypted += cipher.final('hex');
  return crypted;
}

function decrypt(text, secret) {
  if (!isSecretValid(secret)) {
    throw new Error('Secret must have 32 bytes.');
  }
  var decipher = _crypto2.default.createDecipheriv(algorithm, secret, ivFromSecret(secret));
  var dec = decipher.update(text, 'hex', 'utf8');
  dec += decipher.final('utf8');
  return dec;
}