-var config = require('config')
-var crypto = require('crypto')
-var fs = require('fs')
-var openssl = require('openssl-wrapper')
-var path = require('path')
-var ursa = require('ursa')
+const config = require('config')
+const crypto = require('crypto')
+const fs = require('fs')
+const openssl = require('openssl-wrapper')
+const path = require('path')
+const ursa = require('ursa')