/* * Copyright 2018 Scytl Secure Electronic Voting SA * * All rights reserved * * See our extended copyright notice in *file 'Copyright.txt' which is part of this source code package */ /* jshint node:true */ 'use strict'; var SymmetricCryptographyService = require('./service'); var validator = require('./input-validator'); module.exports = { /** * Creates a new SymmetricCryptographyService object, which encapsulates a * symmetric cryptography service. * * @function newService * @global * @param {Object} * [options] An object containing optional arguments. * @param {Policy} * [options.policy=Default policy] The cryptographic policy to * use. * @param {SecureRandomService} * [options.secureRandomService=Created internally] The secure * random service to use. * @returns {SymmetricCryptographyService} The new * SymmetricCryptographyService object. * @throws {Error} * If the input data validation fails. * @example How to use a cryptographic policy that sets the key * length of the symmetric cipher to 32 bytes * * var cryptoPolicy = require('scytl-cryptopolicy'); * var symmetric = require('scytl-symmetric'); * * var myPolicy = cryptoPolicy.newInstance(); * * myPolicy.symmetric.cipher.algorithm.AES_GCM.keyLengthBytes = * cryptoPolicy.options.symmetric.cipher.algorithm.AES_GCM.keyLengthBytes.KL_32; * * var symmetricService = symmetric.newService({policy: myPolicy}); */ newService: function(options) { checkData(options); return new SymmetricCryptographyService(options); } }; function checkData(options) { options = options || {}; if (typeof options.policy !== 'undefined') { validator.checkIsObjectWithProperties( options.policy, 'Cryptographic policy provided to symmetric cryptography service'); } if (typeof options.secureRandomService !== 'undefined') { validator.checkIsObjectWithProperties( options.secureRandomService, 'Secure random service object provided to symmetric cryptography service'); } }